2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
26 * This file drives the GLSL IR -> LIR translation, contains the
27 * optimizations on the LIR, and drives the generation of native code
31 #include "main/macros.h"
35 #include "brw_vec4_gs_visitor.h"
37 #include "brw_dead_control_flow.h"
38 #include "common/gen_debug.h"
39 #include "compiler/glsl_types.h"
40 #include "compiler/nir/nir_builder.h"
41 #include "program/prog_parameter.h"
45 static unsigned get_lowered_simd_width(const struct gen_device_info
*devinfo
,
49 fs_inst::init(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
50 const fs_reg
*src
, unsigned sources
)
52 memset(this, 0, sizeof(*this));
54 this->src
= new fs_reg
[MAX2(sources
, 3)];
55 for (unsigned i
= 0; i
< sources
; i
++)
56 this->src
[i
] = src
[i
];
58 this->opcode
= opcode
;
60 this->sources
= sources
;
61 this->exec_size
= exec_size
;
64 assert(dst
.file
!= IMM
&& dst
.file
!= UNIFORM
);
66 assert(this->exec_size
!= 0);
68 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
70 /* This will be the case for almost all instructions. */
77 this->size_written
= dst
.component_size(exec_size
);
80 this->size_written
= 0;
84 unreachable("Invalid destination register file");
87 this->writes_accumulator
= false;
92 init(BRW_OPCODE_NOP
, 8, dst
, NULL
, 0);
95 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
)
97 init(opcode
, exec_size
, reg_undef
, NULL
, 0);
100 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
)
102 init(opcode
, exec_size
, dst
, NULL
, 0);
105 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
108 const fs_reg src
[1] = { src0
};
109 init(opcode
, exec_size
, dst
, src
, 1);
112 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
113 const fs_reg
&src0
, const fs_reg
&src1
)
115 const fs_reg src
[2] = { src0
, src1
};
116 init(opcode
, exec_size
, dst
, src
, 2);
119 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
120 const fs_reg
&src0
, const fs_reg
&src1
, const fs_reg
&src2
)
122 const fs_reg src
[3] = { src0
, src1
, src2
};
123 init(opcode
, exec_size
, dst
, src
, 3);
126 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_width
, const fs_reg
&dst
,
127 const fs_reg src
[], unsigned sources
)
129 init(opcode
, exec_width
, dst
, src
, sources
);
132 fs_inst::fs_inst(const fs_inst
&that
)
134 memcpy(this, &that
, sizeof(that
));
136 this->src
= new fs_reg
[MAX2(that
.sources
, 3)];
138 for (unsigned i
= 0; i
< that
.sources
; i
++)
139 this->src
[i
] = that
.src
[i
];
148 fs_inst::resize_sources(uint8_t num_sources
)
150 if (this->sources
!= num_sources
) {
151 fs_reg
*src
= new fs_reg
[MAX2(num_sources
, 3)];
153 for (unsigned i
= 0; i
< MIN2(this->sources
, num_sources
); ++i
)
154 src
[i
] = this->src
[i
];
158 this->sources
= num_sources
;
163 fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_builder
&bld
,
165 const fs_reg
&surf_index
,
166 const fs_reg
&varying_offset
,
167 uint32_t const_offset
)
169 /* We have our constant surface use a pitch of 4 bytes, so our index can
170 * be any component of a vector, and then we load 4 contiguous
171 * components starting from that.
173 * We break down the const_offset to a portion added to the variable offset
174 * and a portion done using fs_reg::offset, which means that if you have
175 * GLSL using something like "uniform vec4 a[20]; gl_FragColor = a[i]",
176 * we'll temporarily generate 4 vec4 loads from offset i * 4, and CSE can
177 * later notice that those loads are all the same and eliminate the
180 fs_reg vec4_offset
= vgrf(glsl_type::uint_type
);
181 bld
.ADD(vec4_offset
, varying_offset
, brw_imm_ud(const_offset
& ~0xf));
183 /* The pull load message will load a vec4 (16 bytes). If we are loading
184 * a double this means we are only loading 2 elements worth of data.
185 * We also want to use a 32-bit data type for the dst of the load operation
186 * so other parts of the driver don't get confused about the size of the
189 fs_reg vec4_result
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 4);
190 fs_inst
*inst
= bld
.emit(FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL
,
191 vec4_result
, surf_index
, vec4_offset
);
192 inst
->size_written
= 4 * vec4_result
.component_size(inst
->exec_size
);
194 fs_reg dw
= offset(vec4_result
, bld
, (const_offset
& 0xf) / 4);
195 switch (type_sz(dst
.type
)) {
197 shuffle_32bit_load_result_to_16bit_data(bld
, dst
, dw
, 0, 1);
198 bld
.MOV(dst
, subscript(dw
, dst
.type
, (const_offset
/ 2) & 1));
201 bld
.MOV(dst
, retype(dw
, dst
.type
));
204 shuffle_32bit_load_result_to_64bit_data(bld
, dst
, dw
, 1);
207 unreachable("Unsupported bit_size");
212 * A helper for MOV generation for fixing up broken hardware SEND dependency
216 fs_visitor::DEP_RESOLVE_MOV(const fs_builder
&bld
, int grf
)
218 /* The caller always wants uncompressed to emit the minimal extra
219 * dependencies, and to avoid having to deal with aligning its regs to 2.
221 const fs_builder ubld
= bld
.annotate("send dependency resolve")
224 ubld
.MOV(ubld
.null_reg_f(), fs_reg(VGRF
, grf
, BRW_REGISTER_TYPE_F
));
228 fs_inst::equals(fs_inst
*inst
) const
230 return (opcode
== inst
->opcode
&&
231 dst
.equals(inst
->dst
) &&
232 src
[0].equals(inst
->src
[0]) &&
233 src
[1].equals(inst
->src
[1]) &&
234 src
[2].equals(inst
->src
[2]) &&
235 saturate
== inst
->saturate
&&
236 predicate
== inst
->predicate
&&
237 conditional_mod
== inst
->conditional_mod
&&
238 mlen
== inst
->mlen
&&
239 base_mrf
== inst
->base_mrf
&&
240 target
== inst
->target
&&
242 header_size
== inst
->header_size
&&
243 shadow_compare
== inst
->shadow_compare
&&
244 exec_size
== inst
->exec_size
&&
245 offset
== inst
->offset
);
249 fs_inst::is_send_from_grf() const
252 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
253 case SHADER_OPCODE_SHADER_TIME_ADD
:
254 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
255 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
256 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
257 case SHADER_OPCODE_UNTYPED_ATOMIC
:
258 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
259 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
260 case SHADER_OPCODE_BYTE_SCATTERED_WRITE
:
261 case SHADER_OPCODE_BYTE_SCATTERED_READ
:
262 case SHADER_OPCODE_TYPED_ATOMIC
:
263 case SHADER_OPCODE_TYPED_SURFACE_READ
:
264 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
265 case SHADER_OPCODE_URB_WRITE_SIMD8
:
266 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
267 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
268 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
269 case SHADER_OPCODE_URB_READ_SIMD8
:
270 case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
:
272 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
273 return src
[1].file
== VGRF
;
274 case FS_OPCODE_FB_WRITE
:
275 case FS_OPCODE_FB_READ
:
276 return src
[0].file
== VGRF
;
279 return src
[0].file
== VGRF
;
286 * Returns true if this instruction's sources and destinations cannot
287 * safely be the same register.
289 * In most cases, a register can be written over safely by the same
290 * instruction that is its last use. For a single instruction, the
291 * sources are dereferenced before writing of the destination starts
294 * However, there are a few cases where this can be problematic:
296 * - Virtual opcodes that translate to multiple instructions in the
297 * code generator: if src == dst and one instruction writes the
298 * destination before a later instruction reads the source, then
299 * src will have been clobbered.
301 * - SIMD16 compressed instructions with certain regioning (see below).
303 * The register allocator uses this information to set up conflicts between
304 * GRF sources and the destination.
307 fs_inst::has_source_and_destination_hazard() const
310 case FS_OPCODE_PACK_HALF_2x16_SPLIT
:
311 /* Multiple partial writes to the destination */
314 /* The SIMD16 compressed instruction
316 * add(16) g4<1>F g4<8,8,1>F g6<8,8,1>F
318 * is actually decoded in hardware as:
320 * add(8) g4<1>F g4<8,8,1>F g6<8,8,1>F
321 * add(8) g5<1>F g5<8,8,1>F g7<8,8,1>F
323 * Which is safe. However, if we have uniform accesses
324 * happening, we get into trouble:
326 * add(8) g4<1>F g4<0,1,0>F g6<8,8,1>F
327 * add(8) g5<1>F g4<0,1,0>F g7<8,8,1>F
329 * Now our destination for the first instruction overwrote the
330 * second instruction's src0, and we get garbage for those 8
331 * pixels. There's a similar issue for the pre-gen6
332 * pixel_x/pixel_y, which are registers of 16-bit values and thus
333 * would get stomped by the first decode as well.
335 if (exec_size
== 16) {
336 for (int i
= 0; i
< sources
; i
++) {
337 if (src
[i
].file
== VGRF
&& (src
[i
].stride
== 0 ||
338 src
[i
].type
== BRW_REGISTER_TYPE_UW
||
339 src
[i
].type
== BRW_REGISTER_TYPE_W
||
340 src
[i
].type
== BRW_REGISTER_TYPE_UB
||
341 src
[i
].type
== BRW_REGISTER_TYPE_B
)) {
351 fs_inst::is_copy_payload(const brw::simple_allocator
&grf_alloc
) const
353 if (this->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
356 fs_reg reg
= this->src
[0];
357 if (reg
.file
!= VGRF
|| reg
.offset
!= 0 || reg
.stride
!= 1)
360 if (grf_alloc
.sizes
[reg
.nr
] * REG_SIZE
!= this->size_written
)
363 for (int i
= 0; i
< this->sources
; i
++) {
364 reg
.type
= this->src
[i
].type
;
365 if (!this->src
[i
].equals(reg
))
368 if (i
< this->header_size
) {
369 reg
.offset
+= REG_SIZE
;
371 reg
= horiz_offset(reg
, this->exec_size
);
379 fs_inst::can_do_source_mods(const struct gen_device_info
*devinfo
)
381 if (devinfo
->gen
== 6 && is_math())
384 if (is_send_from_grf())
387 if (!backend_instruction::can_do_source_mods())
394 fs_inst::can_change_types() const
396 return dst
.type
== src
[0].type
&&
397 !src
[0].abs
&& !src
[0].negate
&& !saturate
&&
398 (opcode
== BRW_OPCODE_MOV
||
399 (opcode
== BRW_OPCODE_SEL
&&
400 dst
.type
== src
[1].type
&&
401 predicate
!= BRW_PREDICATE_NONE
&&
402 !src
[1].abs
&& !src
[1].negate
));
408 memset(this, 0, sizeof(*this));
409 type
= BRW_REGISTER_TYPE_UD
;
413 /** Generic unset register constructor. */
417 this->file
= BAD_FILE
;
420 fs_reg::fs_reg(struct ::brw_reg reg
) :
425 if (this->file
== IMM
&&
426 (this->type
!= BRW_REGISTER_TYPE_V
&&
427 this->type
!= BRW_REGISTER_TYPE_UV
&&
428 this->type
!= BRW_REGISTER_TYPE_VF
)) {
434 fs_reg::equals(const fs_reg
&r
) const
436 return (this->backend_reg::equals(r
) &&
441 fs_reg::is_contiguous() const
447 fs_reg::component_size(unsigned width
) const
449 const unsigned stride
= ((file
!= ARF
&& file
!= FIXED_GRF
) ? this->stride
:
452 return MAX2(width
* stride
, 1) * type_sz(type
);
456 type_size_scalar(const struct glsl_type
*type
)
458 unsigned int size
, i
;
460 switch (type
->base_type
) {
463 case GLSL_TYPE_FLOAT
:
465 return type
->components();
466 case GLSL_TYPE_UINT16
:
467 case GLSL_TYPE_INT16
:
468 case GLSL_TYPE_FLOAT16
:
469 return DIV_ROUND_UP(type
->components(), 2);
470 case GLSL_TYPE_DOUBLE
:
471 case GLSL_TYPE_UINT64
:
472 case GLSL_TYPE_INT64
:
473 return type
->components() * 2;
474 case GLSL_TYPE_ARRAY
:
475 return type_size_scalar(type
->fields
.array
) * type
->length
;
476 case GLSL_TYPE_STRUCT
:
478 for (i
= 0; i
< type
->length
; i
++) {
479 size
+= type_size_scalar(type
->fields
.structure
[i
].type
);
482 case GLSL_TYPE_SAMPLER
:
483 /* Samplers take up no register space, since they're baked in at
487 case GLSL_TYPE_ATOMIC_UINT
:
489 case GLSL_TYPE_SUBROUTINE
:
491 case GLSL_TYPE_IMAGE
:
492 return BRW_IMAGE_PARAM_SIZE
;
494 case GLSL_TYPE_ERROR
:
495 case GLSL_TYPE_INTERFACE
:
496 case GLSL_TYPE_FUNCTION
:
497 unreachable("not reached");
504 * Create a MOV to read the timestamp register.
506 * The caller is responsible for emitting the MOV. The return value is
507 * the destination of the MOV, with extra parameters set.
510 fs_visitor::get_timestamp(const fs_builder
&bld
)
512 assert(devinfo
->gen
>= 7);
514 fs_reg ts
= fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE
,
517 BRW_REGISTER_TYPE_UD
));
519 fs_reg dst
= fs_reg(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
521 /* We want to read the 3 fields we care about even if it's not enabled in
524 bld
.group(4, 0).exec_all().MOV(dst
, ts
);
530 fs_visitor::emit_shader_time_begin()
532 /* We want only the low 32 bits of the timestamp. Since it's running
533 * at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,
534 * which is plenty of time for our purposes. It is identical across the
535 * EUs, but since it's tracking GPU core speed it will increment at a
536 * varying rate as render P-states change.
538 shader_start_time
= component(
539 get_timestamp(bld
.annotate("shader time start")), 0);
543 fs_visitor::emit_shader_time_end()
545 /* Insert our code just before the final SEND with EOT. */
546 exec_node
*end
= this->instructions
.get_tail();
547 assert(end
&& ((fs_inst
*) end
)->eot
);
548 const fs_builder ibld
= bld
.annotate("shader time end")
549 .exec_all().at(NULL
, end
);
550 const fs_reg timestamp
= get_timestamp(ibld
);
552 /* We only use the low 32 bits of the timestamp - see
553 * emit_shader_time_begin()).
555 * We could also check if render P-states have changed (or anything
556 * else that might disrupt timing) by setting smear to 2 and checking if
557 * that field is != 0.
559 const fs_reg shader_end_time
= component(timestamp
, 0);
561 /* Check that there weren't any timestamp reset events (assuming these
562 * were the only two timestamp reads that happened).
564 const fs_reg reset
= component(timestamp
, 2);
565 set_condmod(BRW_CONDITIONAL_Z
,
566 ibld
.AND(ibld
.null_reg_ud(), reset
, brw_imm_ud(1u)));
567 ibld
.IF(BRW_PREDICATE_NORMAL
);
569 fs_reg start
= shader_start_time
;
571 const fs_reg diff
= component(fs_reg(VGRF
, alloc
.allocate(1),
572 BRW_REGISTER_TYPE_UD
),
574 const fs_builder cbld
= ibld
.group(1, 0);
575 cbld
.group(1, 0).ADD(diff
, start
, shader_end_time
);
577 /* If there were no instructions between the two timestamp gets, the diff
578 * is 2 cycles. Remove that overhead, so I can forget about that when
579 * trying to determine the time taken for single instructions.
581 cbld
.ADD(diff
, diff
, brw_imm_ud(-2u));
582 SHADER_TIME_ADD(cbld
, 0, diff
);
583 SHADER_TIME_ADD(cbld
, 1, brw_imm_ud(1u));
584 ibld
.emit(BRW_OPCODE_ELSE
);
585 SHADER_TIME_ADD(cbld
, 2, brw_imm_ud(1u));
586 ibld
.emit(BRW_OPCODE_ENDIF
);
590 fs_visitor::SHADER_TIME_ADD(const fs_builder
&bld
,
591 int shader_time_subindex
,
594 int index
= shader_time_index
* 3 + shader_time_subindex
;
595 struct brw_reg offset
= brw_imm_d(index
* BRW_SHADER_TIME_STRIDE
);
598 if (dispatch_width
== 8)
599 payload
= vgrf(glsl_type::uvec2_type
);
601 payload
= vgrf(glsl_type::uint_type
);
603 bld
.emit(SHADER_OPCODE_SHADER_TIME_ADD
, fs_reg(), payload
, offset
, value
);
607 fs_visitor::vfail(const char *format
, va_list va
)
616 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
617 msg
= ralloc_asprintf(mem_ctx
, "%s compile failed: %s\n", stage_abbrev
, msg
);
619 this->fail_msg
= msg
;
622 fprintf(stderr
, "%s", msg
);
627 fs_visitor::fail(const char *format
, ...)
631 va_start(va
, format
);
637 * Mark this program as impossible to compile with dispatch width greater
640 * During the SIMD8 compile (which happens first), we can detect and flag
641 * things that are unsupported in SIMD16+ mode, so the compiler can skip the
642 * SIMD16+ compile altogether.
644 * During a compile of dispatch width greater than n (if one happens anyway),
645 * this just calls fail().
648 fs_visitor::limit_dispatch_width(unsigned n
, const char *msg
)
650 if (dispatch_width
> n
) {
653 max_dispatch_width
= n
;
654 compiler
->shader_perf_log(log_data
,
655 "Shader dispatch width limited to SIMD%d: %s",
661 * Returns true if the instruction has a flag that means it won't
662 * update an entire destination register.
664 * For example, dead code elimination and live variable analysis want to know
665 * when a write to a variable screens off any preceding values that were in
669 fs_inst::is_partial_write() const
671 return ((this->predicate
&& this->opcode
!= BRW_OPCODE_SEL
) ||
672 (this->exec_size
* type_sz(this->dst
.type
)) < 32 ||
673 !this->dst
.is_contiguous() ||
674 this->dst
.offset
% REG_SIZE
!= 0);
678 fs_inst::components_read(unsigned i
) const
680 /* Return zero if the source is not present. */
681 if (src
[i
].file
== BAD_FILE
)
685 case FS_OPCODE_LINTERP
:
691 case FS_OPCODE_PIXEL_X
:
692 case FS_OPCODE_PIXEL_Y
:
696 case FS_OPCODE_FB_WRITE_LOGICAL
:
697 assert(src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].file
== IMM
);
698 /* First/second FB write color. */
700 return src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].ud
;
704 case SHADER_OPCODE_TEX_LOGICAL
:
705 case SHADER_OPCODE_TXD_LOGICAL
:
706 case SHADER_OPCODE_TXF_LOGICAL
:
707 case SHADER_OPCODE_TXL_LOGICAL
:
708 case SHADER_OPCODE_TXS_LOGICAL
:
709 case FS_OPCODE_TXB_LOGICAL
:
710 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
711 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
712 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
713 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
714 case SHADER_OPCODE_LOD_LOGICAL
:
715 case SHADER_OPCODE_TG4_LOGICAL
:
716 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
717 case SHADER_OPCODE_SAMPLEINFO_LOGICAL
:
718 assert(src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].file
== IMM
&&
719 src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].file
== IMM
);
720 /* Texture coordinates. */
721 if (i
== TEX_LOGICAL_SRC_COORDINATE
)
722 return src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].ud
;
723 /* Texture derivatives. */
724 else if ((i
== TEX_LOGICAL_SRC_LOD
|| i
== TEX_LOGICAL_SRC_LOD2
) &&
725 opcode
== SHADER_OPCODE_TXD_LOGICAL
)
726 return src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].ud
;
727 /* Texture offset. */
728 else if (i
== TEX_LOGICAL_SRC_TG4_OFFSET
)
731 else if (i
== TEX_LOGICAL_SRC_MCS
&& opcode
== SHADER_OPCODE_TXF_CMS_W_LOGICAL
)
736 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
737 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
738 assert(src
[3].file
== IMM
);
739 /* Surface coordinates. */
742 /* Surface operation source (ignored for reads). */
748 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
749 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
750 assert(src
[3].file
== IMM
&&
752 /* Surface coordinates. */
755 /* Surface operation source. */
761 case SHADER_OPCODE_BYTE_SCATTERED_READ_LOGICAL
:
762 /* Scattered logical opcodes use the following params:
763 * src[0] Surface coordinates
764 * src[1] Surface operation source (ignored for reads)
766 * src[3] IMM with always 1 dimension.
767 * src[4] IMM with arg bitsize for scattered read/write 8, 16, 32
769 assert(src
[3].file
== IMM
&&
771 return i
== 1 ? 0 : 1;
773 case SHADER_OPCODE_BYTE_SCATTERED_WRITE_LOGICAL
:
774 assert(src
[3].file
== IMM
&&
778 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
779 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
: {
780 assert(src
[3].file
== IMM
&&
782 const unsigned op
= src
[4].ud
;
783 /* Surface coordinates. */
786 /* Surface operation source. */
787 else if (i
== 1 && op
== BRW_AOP_CMPWR
)
789 else if (i
== 1 && (op
== BRW_AOP_INC
|| op
== BRW_AOP_DEC
||
790 op
== BRW_AOP_PREDEC
))
802 fs_inst::size_read(int arg
) const
805 case FS_OPCODE_FB_WRITE
:
806 case FS_OPCODE_FB_READ
:
807 case SHADER_OPCODE_URB_WRITE_SIMD8
:
808 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
809 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
810 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
811 case SHADER_OPCODE_URB_READ_SIMD8
:
812 case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
:
813 case SHADER_OPCODE_UNTYPED_ATOMIC
:
814 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
815 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
816 case SHADER_OPCODE_TYPED_ATOMIC
:
817 case SHADER_OPCODE_TYPED_SURFACE_READ
:
818 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
819 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
820 case SHADER_OPCODE_BYTE_SCATTERED_WRITE
:
821 case SHADER_OPCODE_BYTE_SCATTERED_READ
:
823 return mlen
* REG_SIZE
;
826 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
:
827 /* The payload is actually stored in src1 */
829 return mlen
* REG_SIZE
;
832 case FS_OPCODE_LINTERP
:
837 case SHADER_OPCODE_LOAD_PAYLOAD
:
838 if (arg
< this->header_size
)
842 case CS_OPCODE_CS_TERMINATE
:
843 case SHADER_OPCODE_BARRIER
:
846 case SHADER_OPCODE_MOV_INDIRECT
:
848 assert(src
[2].file
== IMM
);
854 if (is_tex() && arg
== 0 && src
[0].file
== VGRF
)
855 return mlen
* REG_SIZE
;
859 switch (src
[arg
].file
) {
862 return components_read(arg
) * type_sz(src
[arg
].type
);
868 return components_read(arg
) * src
[arg
].component_size(exec_size
);
870 unreachable("MRF registers are not allowed as sources");
876 /* Return the subset of flag registers that an instruction could
877 * potentially read or write based on the execution controls and flag
878 * subregister number of the instruction.
881 flag_mask(const fs_inst
*inst
)
883 const unsigned start
= inst
->flag_subreg
* 16 + inst
->group
;
884 const unsigned end
= start
+ inst
->exec_size
;
885 return ((1 << DIV_ROUND_UP(end
, 8)) - 1) & ~((1 << (start
/ 8)) - 1);
891 return (n
>= CHAR_BIT
* sizeof(bit_mask(n
)) ? ~0u : (1u << n
) - 1);
895 flag_mask(const fs_reg
&r
, unsigned sz
)
898 const unsigned start
= (r
.nr
- BRW_ARF_FLAG
) * 4 + r
.subnr
;
899 const unsigned end
= start
+ sz
;
900 return bit_mask(end
) & ~bit_mask(start
);
908 fs_inst::flags_read(const gen_device_info
*devinfo
) const
910 if (predicate
== BRW_PREDICATE_ALIGN1_ANYV
||
911 predicate
== BRW_PREDICATE_ALIGN1_ALLV
) {
912 /* The vertical predication modes combine corresponding bits from
913 * f0.0 and f1.0 on Gen7+, and f0.0 and f0.1 on older hardware.
915 const unsigned shift
= devinfo
->gen
>= 7 ? 4 : 2;
916 return flag_mask(this) << shift
| flag_mask(this);
917 } else if (predicate
) {
918 return flag_mask(this);
921 for (int i
= 0; i
< sources
; i
++) {
922 mask
|= flag_mask(src
[i
], size_read(i
));
929 fs_inst::flags_written() const
931 if ((conditional_mod
&& (opcode
!= BRW_OPCODE_SEL
&&
932 opcode
!= BRW_OPCODE_IF
&&
933 opcode
!= BRW_OPCODE_WHILE
)) ||
934 opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
||
935 opcode
== SHADER_OPCODE_FIND_LIVE_CHANNEL
) {
936 return flag_mask(this);
938 return flag_mask(dst
, size_written
);
943 * Returns how many MRFs an FS opcode will write over.
945 * Note that this is not the 0 or 1 implied writes in an actual gen
946 * instruction -- the FS opcodes often generate MOVs in addition.
949 fs_visitor::implied_mrf_writes(fs_inst
*inst
) const
954 if (inst
->base_mrf
== -1)
957 switch (inst
->opcode
) {
958 case SHADER_OPCODE_RCP
:
959 case SHADER_OPCODE_RSQ
:
960 case SHADER_OPCODE_SQRT
:
961 case SHADER_OPCODE_EXP2
:
962 case SHADER_OPCODE_LOG2
:
963 case SHADER_OPCODE_SIN
:
964 case SHADER_OPCODE_COS
:
965 return 1 * dispatch_width
/ 8;
966 case SHADER_OPCODE_POW
:
967 case SHADER_OPCODE_INT_QUOTIENT
:
968 case SHADER_OPCODE_INT_REMAINDER
:
969 return 2 * dispatch_width
/ 8;
970 case SHADER_OPCODE_TEX
:
972 case SHADER_OPCODE_TXD
:
973 case SHADER_OPCODE_TXF
:
974 case SHADER_OPCODE_TXF_CMS
:
975 case SHADER_OPCODE_TXF_MCS
:
976 case SHADER_OPCODE_TG4
:
977 case SHADER_OPCODE_TG4_OFFSET
:
978 case SHADER_OPCODE_TXL
:
979 case SHADER_OPCODE_TXS
:
980 case SHADER_OPCODE_LOD
:
981 case SHADER_OPCODE_SAMPLEINFO
:
983 case FS_OPCODE_FB_WRITE
:
985 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
986 case SHADER_OPCODE_GEN4_SCRATCH_READ
:
988 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN4
:
990 case SHADER_OPCODE_GEN4_SCRATCH_WRITE
:
993 unreachable("not reached");
998 fs_visitor::vgrf(const glsl_type
*const type
)
1000 int reg_width
= dispatch_width
/ 8;
1001 return fs_reg(VGRF
, alloc
.allocate(type_size_scalar(type
) * reg_width
),
1002 brw_type_for_base_type(type
));
1005 fs_reg::fs_reg(enum brw_reg_file file
, int nr
)
1010 this->type
= BRW_REGISTER_TYPE_F
;
1011 this->stride
= (file
== UNIFORM
? 0 : 1);
1014 fs_reg::fs_reg(enum brw_reg_file file
, int nr
, enum brw_reg_type type
)
1020 this->stride
= (file
== UNIFORM
? 0 : 1);
1023 /* For SIMD16, we need to follow from the uniform setup of SIMD8 dispatch.
1024 * This brings in those uniform definitions
1027 fs_visitor::import_uniforms(fs_visitor
*v
)
1029 this->push_constant_loc
= v
->push_constant_loc
;
1030 this->pull_constant_loc
= v
->pull_constant_loc
;
1031 this->uniforms
= v
->uniforms
;
1032 this->subgroup_id
= v
->subgroup_id
;
1036 fs_visitor::emit_fragcoord_interpolation(fs_reg wpos
)
1038 assert(stage
== MESA_SHADER_FRAGMENT
);
1040 /* gl_FragCoord.x */
1041 bld
.MOV(wpos
, this->pixel_x
);
1042 wpos
= offset(wpos
, bld
, 1);
1044 /* gl_FragCoord.y */
1045 bld
.MOV(wpos
, this->pixel_y
);
1046 wpos
= offset(wpos
, bld
, 1);
1048 /* gl_FragCoord.z */
1049 if (devinfo
->gen
>= 6) {
1050 bld
.MOV(wpos
, fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0)));
1052 bld
.emit(FS_OPCODE_LINTERP
, wpos
,
1053 this->delta_xy
[BRW_BARYCENTRIC_PERSPECTIVE_PIXEL
],
1054 interp_reg(VARYING_SLOT_POS
, 2));
1056 wpos
= offset(wpos
, bld
, 1);
1058 /* gl_FragCoord.w: Already set up in emit_interpolation */
1059 bld
.MOV(wpos
, this->wpos_w
);
1062 enum brw_barycentric_mode
1063 brw_barycentric_mode(enum glsl_interp_mode mode
, nir_intrinsic_op op
)
1065 /* Barycentric modes don't make sense for flat inputs. */
1066 assert(mode
!= INTERP_MODE_FLAT
);
1070 case nir_intrinsic_load_barycentric_pixel
:
1071 case nir_intrinsic_load_barycentric_at_offset
:
1072 bary
= BRW_BARYCENTRIC_PERSPECTIVE_PIXEL
;
1074 case nir_intrinsic_load_barycentric_centroid
:
1075 bary
= BRW_BARYCENTRIC_PERSPECTIVE_CENTROID
;
1077 case nir_intrinsic_load_barycentric_sample
:
1078 case nir_intrinsic_load_barycentric_at_sample
:
1079 bary
= BRW_BARYCENTRIC_PERSPECTIVE_SAMPLE
;
1082 unreachable("invalid intrinsic");
1085 if (mode
== INTERP_MODE_NOPERSPECTIVE
)
1088 return (enum brw_barycentric_mode
) bary
;
1092 * Turn one of the two CENTROID barycentric modes into PIXEL mode.
1094 static enum brw_barycentric_mode
1095 centroid_to_pixel(enum brw_barycentric_mode bary
)
1097 assert(bary
== BRW_BARYCENTRIC_PERSPECTIVE_CENTROID
||
1098 bary
== BRW_BARYCENTRIC_NONPERSPECTIVE_CENTROID
);
1099 return (enum brw_barycentric_mode
) ((unsigned) bary
- 1);
1103 fs_visitor::emit_frontfacing_interpolation()
1105 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::bool_type
));
1107 if (devinfo
->gen
>= 6) {
1108 /* Bit 15 of g0.0 is 0 if the polygon is front facing. We want to create
1109 * a boolean result from this (~0/true or 0/false).
1111 * We can use the fact that bit 15 is the MSB of g0.0:W to accomplish
1112 * this task in only one instruction:
1113 * - a negation source modifier will flip the bit; and
1114 * - a W -> D type conversion will sign extend the bit into the high
1115 * word of the destination.
1117 * An ASR 15 fills the low word of the destination.
1119 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
1122 bld
.ASR(*reg
, g0
, brw_imm_d(15));
1124 /* Bit 31 of g1.6 is 0 if the polygon is front facing. We want to create
1125 * a boolean result from this (1/true or 0/false).
1127 * Like in the above case, since the bit is the MSB of g1.6:UD we can use
1128 * the negation source modifier to flip it. Unfortunately the SHR
1129 * instruction only operates on UD (or D with an abs source modifier)
1130 * sources without negation.
1132 * Instead, use ASR (which will give ~0/true or 0/false).
1134 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
1137 bld
.ASR(*reg
, g1_6
, brw_imm_d(31));
1144 fs_visitor::compute_sample_position(fs_reg dst
, fs_reg int_sample_pos
)
1146 assert(stage
== MESA_SHADER_FRAGMENT
);
1147 struct brw_wm_prog_data
*wm_prog_data
= brw_wm_prog_data(this->prog_data
);
1148 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
1150 if (wm_prog_data
->persample_dispatch
) {
1151 /* Convert int_sample_pos to floating point */
1152 bld
.MOV(dst
, int_sample_pos
);
1153 /* Scale to the range [0, 1] */
1154 bld
.MUL(dst
, dst
, brw_imm_f(1 / 16.0f
));
1157 /* From ARB_sample_shading specification:
1158 * "When rendering to a non-multisample buffer, or if multisample
1159 * rasterization is disabled, gl_SamplePosition will always be
1162 bld
.MOV(dst
, brw_imm_f(0.5f
));
1167 fs_visitor::emit_samplepos_setup()
1169 assert(devinfo
->gen
>= 6);
1171 const fs_builder abld
= bld
.annotate("compute sample position");
1172 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec2_type
));
1174 fs_reg int_sample_x
= vgrf(glsl_type::int_type
);
1175 fs_reg int_sample_y
= vgrf(glsl_type::int_type
);
1177 /* WM will be run in MSDISPMODE_PERSAMPLE. So, only one of SIMD8 or SIMD16
1178 * mode will be enabled.
1180 * From the Ivy Bridge PRM, volume 2 part 1, page 344:
1181 * R31.1:0 Position Offset X/Y for Slot[3:0]
1182 * R31.3:2 Position Offset X/Y for Slot[7:4]
1185 * The X, Y sample positions come in as bytes in thread payload. So, read
1186 * the positions using vstride=16, width=8, hstride=2.
1188 struct brw_reg sample_pos_reg
=
1189 stride(retype(brw_vec1_grf(payload
.sample_pos_reg
, 0),
1190 BRW_REGISTER_TYPE_B
), 16, 8, 2);
1192 if (dispatch_width
== 8) {
1193 abld
.MOV(int_sample_x
, fs_reg(sample_pos_reg
));
1195 abld
.half(0).MOV(half(int_sample_x
, 0), fs_reg(sample_pos_reg
));
1196 abld
.half(1).MOV(half(int_sample_x
, 1),
1197 fs_reg(suboffset(sample_pos_reg
, 16)));
1199 /* Compute gl_SamplePosition.x */
1200 compute_sample_position(pos
, int_sample_x
);
1201 pos
= offset(pos
, abld
, 1);
1202 if (dispatch_width
== 8) {
1203 abld
.MOV(int_sample_y
, fs_reg(suboffset(sample_pos_reg
, 1)));
1205 abld
.half(0).MOV(half(int_sample_y
, 0),
1206 fs_reg(suboffset(sample_pos_reg
, 1)));
1207 abld
.half(1).MOV(half(int_sample_y
, 1),
1208 fs_reg(suboffset(sample_pos_reg
, 17)));
1210 /* Compute gl_SamplePosition.y */
1211 compute_sample_position(pos
, int_sample_y
);
1216 fs_visitor::emit_sampleid_setup()
1218 assert(stage
== MESA_SHADER_FRAGMENT
);
1219 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1220 assert(devinfo
->gen
>= 6);
1222 const fs_builder abld
= bld
.annotate("compute sample id");
1223 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::uint_type
));
1225 if (!key
->multisample_fbo
) {
1226 /* As per GL_ARB_sample_shading specification:
1227 * "When rendering to a non-multisample buffer, or if multisample
1228 * rasterization is disabled, gl_SampleID will always be zero."
1230 abld
.MOV(*reg
, brw_imm_d(0));
1231 } else if (devinfo
->gen
>= 8) {
1232 /* Sample ID comes in as 4-bit numbers in g1.0:
1234 * 15:12 Slot 3 SampleID (only used in SIMD16)
1235 * 11:8 Slot 2 SampleID (only used in SIMD16)
1236 * 7:4 Slot 1 SampleID
1237 * 3:0 Slot 0 SampleID
1239 * Each slot corresponds to four channels, so we want to replicate each
1240 * half-byte value to 4 channels in a row:
1242 * dst+0: .7 .6 .5 .4 .3 .2 .1 .0
1243 * 7:4 7:4 7:4 7:4 3:0 3:0 3:0 3:0
1245 * dst+1: .7 .6 .5 .4 .3 .2 .1 .0 (if SIMD16)
1246 * 15:12 15:12 15:12 15:12 11:8 11:8 11:8 11:8
1248 * First, we read g1.0 with a <1,8,0>UB region, causing the first 8
1249 * channels to read the first byte (7:0), and the second group of 8
1250 * channels to read the second byte (15:8). Then, we shift right by
1251 * a vector immediate of <4, 4, 4, 4, 0, 0, 0, 0>, moving the slot 1 / 3
1252 * values into place. Finally, we AND with 0xf to keep the low nibble.
1254 * shr(16) tmp<1>W g1.0<1,8,0>B 0x44440000:V
1255 * and(16) dst<1>D tmp<8,8,1>W 0xf:W
1257 * TODO: These payload bits exist on Gen7 too, but they appear to always
1258 * be zero, so this code fails to work. We should find out why.
1260 fs_reg
tmp(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UW
);
1262 abld
.SHR(tmp
, fs_reg(stride(retype(brw_vec1_grf(1, 0),
1263 BRW_REGISTER_TYPE_UB
), 1, 8, 0)),
1264 brw_imm_v(0x44440000));
1265 abld
.AND(*reg
, tmp
, brw_imm_w(0xf));
1267 const fs_reg t1
= component(fs_reg(VGRF
, alloc
.allocate(1),
1268 BRW_REGISTER_TYPE_UD
), 0);
1269 const fs_reg
t2(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UW
);
1271 /* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
1272 * 8x multisampling, subspan 0 will represent sample N (where N
1273 * is 0, 2, 4 or 6), subspan 1 will represent sample 1, 3, 5 or
1274 * 7. We can find the value of N by looking at R0.0 bits 7:6
1275 * ("Starting Sample Pair Index (SSPI)") and multiplying by two
1276 * (since samples are always delivered in pairs). That is, we
1277 * compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 & 0xc0) >> 5. Then
1278 * we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1) in
1279 * case of SIMD8 and sequence (0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
1280 * 2, 3, 3, 3, 3) in case of SIMD16. We compute this sequence by
1281 * populating a temporary variable with the sequence (0, 1, 2, 3),
1282 * and then reading from it using vstride=1, width=4, hstride=0.
1283 * These computations hold good for 4x multisampling as well.
1285 * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1):
1286 * the first four slots are sample 0 of subspan 0; the next four
1287 * are sample 1 of subspan 0; the third group is sample 0 of
1288 * subspan 1, and finally sample 1 of subspan 1.
1291 /* SKL+ has an extra bit for the Starting Sample Pair Index to
1292 * accomodate 16x MSAA.
1294 abld
.exec_all().group(1, 0)
1295 .AND(t1
, fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)),
1297 abld
.exec_all().group(1, 0).SHR(t1
, t1
, brw_imm_d(5));
1299 /* This works for both SIMD8 and SIMD16 */
1300 abld
.exec_all().group(4, 0).MOV(t2
, brw_imm_v(0x3210));
1302 /* This special instruction takes care of setting vstride=1,
1303 * width=4, hstride=0 of t2 during an ADD instruction.
1305 abld
.emit(FS_OPCODE_SET_SAMPLE_ID
, *reg
, t1
, t2
);
1312 fs_visitor::emit_samplemaskin_setup()
1314 assert(stage
== MESA_SHADER_FRAGMENT
);
1315 struct brw_wm_prog_data
*wm_prog_data
= brw_wm_prog_data(this->prog_data
);
1316 assert(devinfo
->gen
>= 6);
1318 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::int_type
));
1320 fs_reg
coverage_mask(retype(brw_vec8_grf(payload
.sample_mask_in_reg
, 0),
1321 BRW_REGISTER_TYPE_D
));
1323 if (wm_prog_data
->persample_dispatch
) {
1324 /* gl_SampleMaskIn[] comes from two sources: the input coverage mask,
1325 * and a mask representing which sample is being processed by the
1326 * current shader invocation.
1328 * From the OES_sample_variables specification:
1329 * "When per-sample shading is active due to the use of a fragment input
1330 * qualified by "sample" or due to the use of the gl_SampleID or
1331 * gl_SamplePosition variables, only the bit for the current sample is
1332 * set in gl_SampleMaskIn."
1334 const fs_builder abld
= bld
.annotate("compute gl_SampleMaskIn");
1336 if (nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
].file
== BAD_FILE
)
1337 nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
] = *emit_sampleid_setup();
1339 fs_reg one
= vgrf(glsl_type::int_type
);
1340 fs_reg enabled_mask
= vgrf(glsl_type::int_type
);
1341 abld
.MOV(one
, brw_imm_d(1));
1342 abld
.SHL(enabled_mask
, one
, nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
]);
1343 abld
.AND(*reg
, enabled_mask
, coverage_mask
);
1345 /* In per-pixel mode, the coverage mask is sufficient. */
1346 *reg
= coverage_mask
;
1352 fs_visitor::resolve_source_modifiers(const fs_reg
&src
)
1354 if (!src
.abs
&& !src
.negate
)
1357 fs_reg temp
= bld
.vgrf(src
.type
);
1364 fs_visitor::emit_discard_jump()
1366 assert(brw_wm_prog_data(this->prog_data
)->uses_kill
);
1368 /* For performance, after a discard, jump to the end of the
1369 * shader if all relevant channels have been discarded.
1371 fs_inst
*discard_jump
= bld
.emit(FS_OPCODE_DISCARD_JUMP
);
1372 discard_jump
->flag_subreg
= 1;
1374 discard_jump
->predicate
= BRW_PREDICATE_ALIGN1_ANY4H
;
1375 discard_jump
->predicate_inverse
= true;
1379 fs_visitor::emit_gs_thread_end()
1381 assert(stage
== MESA_SHADER_GEOMETRY
);
1383 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
1385 if (gs_compile
->control_data_header_size_bits
> 0) {
1386 emit_gs_control_data_bits(this->final_gs_vertex_count
);
1389 const fs_builder abld
= bld
.annotate("thread end");
1392 if (gs_prog_data
->static_vertex_count
!= -1) {
1393 foreach_in_list_reverse(fs_inst
, prev
, &this->instructions
) {
1394 if (prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8
||
1395 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
||
1396 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
||
1397 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
) {
1400 /* Delete now dead instructions. */
1401 foreach_in_list_reverse_safe(exec_node
, dead
, &this->instructions
) {
1407 } else if (prev
->is_control_flow() || prev
->has_side_effects()) {
1411 fs_reg hdr
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1412 abld
.MOV(hdr
, fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
)));
1413 inst
= abld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8
, reg_undef
, hdr
);
1416 fs_reg payload
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
1417 fs_reg
*sources
= ralloc_array(mem_ctx
, fs_reg
, 2);
1418 sources
[0] = fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
));
1419 sources
[1] = this->final_gs_vertex_count
;
1420 abld
.LOAD_PAYLOAD(payload
, sources
, 2, 2);
1421 inst
= abld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8
, reg_undef
, payload
);
1429 fs_visitor::assign_curb_setup()
1431 unsigned uniform_push_length
= DIV_ROUND_UP(stage_prog_data
->nr_params
, 8);
1433 unsigned ubo_push_length
= 0;
1434 unsigned ubo_push_start
[4];
1435 for (int i
= 0; i
< 4; i
++) {
1436 ubo_push_start
[i
] = 8 * (ubo_push_length
+ uniform_push_length
);
1437 ubo_push_length
+= stage_prog_data
->ubo_ranges
[i
].length
;
1440 prog_data
->curb_read_length
= uniform_push_length
+ ubo_push_length
;
1442 /* Map the offsets in the UNIFORM file to fixed HW regs. */
1443 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1444 for (unsigned int i
= 0; i
< inst
->sources
; i
++) {
1445 if (inst
->src
[i
].file
== UNIFORM
) {
1446 int uniform_nr
= inst
->src
[i
].nr
+ inst
->src
[i
].offset
/ 4;
1448 if (inst
->src
[i
].nr
>= UBO_START
) {
1449 /* constant_nr is in 32-bit units, the rest are in bytes */
1450 constant_nr
= ubo_push_start
[inst
->src
[i
].nr
- UBO_START
] +
1451 inst
->src
[i
].offset
/ 4;
1452 } else if (uniform_nr
>= 0 && uniform_nr
< (int) uniforms
) {
1453 constant_nr
= push_constant_loc
[uniform_nr
];
1455 /* Section 5.11 of the OpenGL 4.1 spec says:
1456 * "Out-of-bounds reads return undefined values, which include
1457 * values from other variables of the active program or zero."
1458 * Just return the first push constant.
1463 struct brw_reg brw_reg
= brw_vec1_grf(payload
.num_regs
+
1466 brw_reg
.abs
= inst
->src
[i
].abs
;
1467 brw_reg
.negate
= inst
->src
[i
].negate
;
1469 assert(inst
->src
[i
].stride
== 0);
1470 inst
->src
[i
] = byte_offset(
1471 retype(brw_reg
, inst
->src
[i
].type
),
1472 inst
->src
[i
].offset
% 4);
1477 /* This may be updated in assign_urb_setup or assign_vs_urb_setup. */
1478 this->first_non_payload_grf
= payload
.num_regs
+ prog_data
->curb_read_length
;
1482 fs_visitor::calculate_urb_setup()
1484 assert(stage
== MESA_SHADER_FRAGMENT
);
1485 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
1486 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1488 memset(prog_data
->urb_setup
, -1,
1489 sizeof(prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
1492 /* Figure out where each of the incoming setup attributes lands. */
1493 if (devinfo
->gen
>= 6) {
1494 if (_mesa_bitcount_64(nir
->info
.inputs_read
&
1495 BRW_FS_VARYING_INPUT_MASK
) <= 16) {
1496 /* The SF/SBE pipeline stage can do arbitrary rearrangement of the
1497 * first 16 varying inputs, so we can put them wherever we want.
1498 * Just put them in order.
1500 * This is useful because it means that (a) inputs not used by the
1501 * fragment shader won't take up valuable register space, and (b) we
1502 * won't have to recompile the fragment shader if it gets paired with
1503 * a different vertex (or geometry) shader.
1505 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1506 if (nir
->info
.inputs_read
& BRW_FS_VARYING_INPUT_MASK
&
1507 BITFIELD64_BIT(i
)) {
1508 prog_data
->urb_setup
[i
] = urb_next
++;
1512 /* We have enough input varyings that the SF/SBE pipeline stage can't
1513 * arbitrarily rearrange them to suit our whim; we have to put them
1514 * in an order that matches the output of the previous pipeline stage
1515 * (geometry or vertex shader).
1517 struct brw_vue_map prev_stage_vue_map
;
1518 brw_compute_vue_map(devinfo
, &prev_stage_vue_map
,
1519 key
->input_slots_valid
,
1520 nir
->info
.separate_shader
);
1523 brw_compute_first_urb_slot_required(nir
->info
.inputs_read
,
1524 &prev_stage_vue_map
);
1526 assert(prev_stage_vue_map
.num_slots
<= first_slot
+ 32);
1527 for (int slot
= first_slot
; slot
< prev_stage_vue_map
.num_slots
;
1529 int varying
= prev_stage_vue_map
.slot_to_varying
[slot
];
1530 if (varying
!= BRW_VARYING_SLOT_PAD
&&
1531 (nir
->info
.inputs_read
& BRW_FS_VARYING_INPUT_MASK
&
1532 BITFIELD64_BIT(varying
))) {
1533 prog_data
->urb_setup
[varying
] = slot
- first_slot
;
1536 urb_next
= prev_stage_vue_map
.num_slots
- first_slot
;
1539 /* FINISHME: The sf doesn't map VS->FS inputs for us very well. */
1540 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1541 /* Point size is packed into the header, not as a general attribute */
1542 if (i
== VARYING_SLOT_PSIZ
)
1545 if (key
->input_slots_valid
& BITFIELD64_BIT(i
)) {
1546 /* The back color slot is skipped when the front color is
1547 * also written to. In addition, some slots can be
1548 * written in the vertex shader and not read in the
1549 * fragment shader. So the register number must always be
1550 * incremented, mapped or not.
1552 if (_mesa_varying_slot_in_fs((gl_varying_slot
) i
))
1553 prog_data
->urb_setup
[i
] = urb_next
;
1559 * It's a FS only attribute, and we did interpolation for this attribute
1560 * in SF thread. So, count it here, too.
1562 * See compile_sf_prog() for more info.
1564 if (nir
->info
.inputs_read
& BITFIELD64_BIT(VARYING_SLOT_PNTC
))
1565 prog_data
->urb_setup
[VARYING_SLOT_PNTC
] = urb_next
++;
1568 prog_data
->num_varying_inputs
= urb_next
;
1572 fs_visitor::assign_urb_setup()
1574 assert(stage
== MESA_SHADER_FRAGMENT
);
1575 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
1577 int urb_start
= payload
.num_regs
+ prog_data
->base
.curb_read_length
;
1579 /* Offset all the urb_setup[] index by the actual position of the
1580 * setup regs, now that the location of the constants has been chosen.
1582 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1583 if (inst
->opcode
== FS_OPCODE_LINTERP
) {
1584 assert(inst
->src
[1].file
== FIXED_GRF
);
1585 inst
->src
[1].nr
+= urb_start
;
1588 if (inst
->opcode
== FS_OPCODE_CINTERP
) {
1589 assert(inst
->src
[0].file
== FIXED_GRF
);
1590 inst
->src
[0].nr
+= urb_start
;
1594 /* Each attribute is 4 setup channels, each of which is half a reg. */
1595 this->first_non_payload_grf
+= prog_data
->num_varying_inputs
* 2;
1599 fs_visitor::convert_attr_sources_to_hw_regs(fs_inst
*inst
)
1601 for (int i
= 0; i
< inst
->sources
; i
++) {
1602 if (inst
->src
[i
].file
== ATTR
) {
1603 int grf
= payload
.num_regs
+
1604 prog_data
->curb_read_length
+
1606 inst
->src
[i
].offset
/ REG_SIZE
;
1608 /* As explained at brw_reg_from_fs_reg, From the Haswell PRM:
1610 * VertStride must be used to cross GRF register boundaries. This
1611 * rule implies that elements within a 'Width' cannot cross GRF
1614 * So, for registers that are large enough, we have to split the exec
1615 * size in two and trust the compression state to sort it out.
1617 unsigned total_size
= inst
->exec_size
*
1618 inst
->src
[i
].stride
*
1619 type_sz(inst
->src
[i
].type
);
1621 assert(total_size
<= 2 * REG_SIZE
);
1622 const unsigned exec_size
=
1623 (total_size
<= REG_SIZE
) ? inst
->exec_size
: inst
->exec_size
/ 2;
1625 unsigned width
= inst
->src
[i
].stride
== 0 ? 1 : exec_size
;
1626 struct brw_reg reg
=
1627 stride(byte_offset(retype(brw_vec8_grf(grf
, 0), inst
->src
[i
].type
),
1628 inst
->src
[i
].offset
% REG_SIZE
),
1629 exec_size
* inst
->src
[i
].stride
,
1630 width
, inst
->src
[i
].stride
);
1631 reg
.abs
= inst
->src
[i
].abs
;
1632 reg
.negate
= inst
->src
[i
].negate
;
1640 fs_visitor::assign_vs_urb_setup()
1642 struct brw_vs_prog_data
*vs_prog_data
= brw_vs_prog_data(prog_data
);
1644 assert(stage
== MESA_SHADER_VERTEX
);
1646 /* Each attribute is 4 regs. */
1647 this->first_non_payload_grf
+= 4 * vs_prog_data
->nr_attribute_slots
;
1649 assert(vs_prog_data
->base
.urb_read_length
<= 15);
1651 /* Rewrite all ATTR file references to the hw grf that they land in. */
1652 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1653 convert_attr_sources_to_hw_regs(inst
);
1658 fs_visitor::assign_tcs_single_patch_urb_setup()
1660 assert(stage
== MESA_SHADER_TESS_CTRL
);
1662 /* Rewrite all ATTR file references to HW_REGs. */
1663 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1664 convert_attr_sources_to_hw_regs(inst
);
1669 fs_visitor::assign_tes_urb_setup()
1671 assert(stage
== MESA_SHADER_TESS_EVAL
);
1673 struct brw_vue_prog_data
*vue_prog_data
= brw_vue_prog_data(prog_data
);
1675 first_non_payload_grf
+= 8 * vue_prog_data
->urb_read_length
;
1677 /* Rewrite all ATTR file references to HW_REGs. */
1678 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1679 convert_attr_sources_to_hw_regs(inst
);
1684 fs_visitor::assign_gs_urb_setup()
1686 assert(stage
== MESA_SHADER_GEOMETRY
);
1688 struct brw_vue_prog_data
*vue_prog_data
= brw_vue_prog_data(prog_data
);
1690 first_non_payload_grf
+=
1691 8 * vue_prog_data
->urb_read_length
* nir
->info
.gs
.vertices_in
;
1693 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1694 /* Rewrite all ATTR file references to GRFs. */
1695 convert_attr_sources_to_hw_regs(inst
);
1701 * Split large virtual GRFs into separate components if we can.
1703 * This is mostly duplicated with what brw_fs_vector_splitting does,
1704 * but that's really conservative because it's afraid of doing
1705 * splitting that doesn't result in real progress after the rest of
1706 * the optimization phases, which would cause infinite looping in
1707 * optimization. We can do it once here, safely. This also has the
1708 * opportunity to split interpolated values, or maybe even uniforms,
1709 * which we don't have at the IR level.
1711 * We want to split, because virtual GRFs are what we register
1712 * allocate and spill (due to contiguousness requirements for some
1713 * instructions), and they're what we naturally generate in the
1714 * codegen process, but most virtual GRFs don't actually need to be
1715 * contiguous sets of GRFs. If we split, we'll end up with reduced
1716 * live intervals and better dead code elimination and coalescing.
1719 fs_visitor::split_virtual_grfs()
1721 /* Compact the register file so we eliminate dead vgrfs. This
1722 * only defines split points for live registers, so if we have
1723 * too large dead registers they will hit assertions later.
1725 compact_virtual_grfs();
1727 int num_vars
= this->alloc
.count
;
1729 /* Count the total number of registers */
1731 int vgrf_to_reg
[num_vars
];
1732 for (int i
= 0; i
< num_vars
; i
++) {
1733 vgrf_to_reg
[i
] = reg_count
;
1734 reg_count
+= alloc
.sizes
[i
];
1737 /* An array of "split points". For each register slot, this indicates
1738 * if this slot can be separated from the previous slot. Every time an
1739 * instruction uses multiple elements of a register (as a source or
1740 * destination), we mark the used slots as inseparable. Then we go
1741 * through and split the registers into the smallest pieces we can.
1743 bool split_points
[reg_count
];
1744 memset(split_points
, 0, sizeof(split_points
));
1746 /* Mark all used registers as fully splittable */
1747 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1748 if (inst
->dst
.file
== VGRF
) {
1749 int reg
= vgrf_to_reg
[inst
->dst
.nr
];
1750 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->dst
.nr
]; j
++)
1751 split_points
[reg
+ j
] = true;
1754 for (int i
= 0; i
< inst
->sources
; i
++) {
1755 if (inst
->src
[i
].file
== VGRF
) {
1756 int reg
= vgrf_to_reg
[inst
->src
[i
].nr
];
1757 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->src
[i
].nr
]; j
++)
1758 split_points
[reg
+ j
] = true;
1763 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1764 if (inst
->dst
.file
== VGRF
) {
1765 int reg
= vgrf_to_reg
[inst
->dst
.nr
] + inst
->dst
.offset
/ REG_SIZE
;
1766 for (unsigned j
= 1; j
< regs_written(inst
); j
++)
1767 split_points
[reg
+ j
] = false;
1769 for (int i
= 0; i
< inst
->sources
; i
++) {
1770 if (inst
->src
[i
].file
== VGRF
) {
1771 int reg
= vgrf_to_reg
[inst
->src
[i
].nr
] + inst
->src
[i
].offset
/ REG_SIZE
;
1772 for (unsigned j
= 1; j
< regs_read(inst
, i
); j
++)
1773 split_points
[reg
+ j
] = false;
1778 int new_virtual_grf
[reg_count
];
1779 int new_reg_offset
[reg_count
];
1782 for (int i
= 0; i
< num_vars
; i
++) {
1783 /* The first one should always be 0 as a quick sanity check. */
1784 assert(split_points
[reg
] == false);
1787 new_reg_offset
[reg
] = 0;
1792 for (unsigned j
= 1; j
< alloc
.sizes
[i
]; j
++) {
1793 /* If this is a split point, reset the offset to 0 and allocate a
1794 * new virtual GRF for the previous offset many registers
1796 if (split_points
[reg
]) {
1797 assert(offset
<= MAX_VGRF_SIZE
);
1798 int grf
= alloc
.allocate(offset
);
1799 for (int k
= reg
- offset
; k
< reg
; k
++)
1800 new_virtual_grf
[k
] = grf
;
1803 new_reg_offset
[reg
] = offset
;
1808 /* The last one gets the original register number */
1809 assert(offset
<= MAX_VGRF_SIZE
);
1810 alloc
.sizes
[i
] = offset
;
1811 for (int k
= reg
- offset
; k
< reg
; k
++)
1812 new_virtual_grf
[k
] = i
;
1814 assert(reg
== reg_count
);
1816 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1817 if (inst
->dst
.file
== VGRF
) {
1818 reg
= vgrf_to_reg
[inst
->dst
.nr
] + inst
->dst
.offset
/ REG_SIZE
;
1819 inst
->dst
.nr
= new_virtual_grf
[reg
];
1820 inst
->dst
.offset
= new_reg_offset
[reg
] * REG_SIZE
+
1821 inst
->dst
.offset
% REG_SIZE
;
1822 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1824 for (int i
= 0; i
< inst
->sources
; i
++) {
1825 if (inst
->src
[i
].file
== VGRF
) {
1826 reg
= vgrf_to_reg
[inst
->src
[i
].nr
] + inst
->src
[i
].offset
/ REG_SIZE
;
1827 inst
->src
[i
].nr
= new_virtual_grf
[reg
];
1828 inst
->src
[i
].offset
= new_reg_offset
[reg
] * REG_SIZE
+
1829 inst
->src
[i
].offset
% REG_SIZE
;
1830 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1834 invalidate_live_intervals();
1838 * Remove unused virtual GRFs and compact the virtual_grf_* arrays.
1840 * During code generation, we create tons of temporary variables, many of
1841 * which get immediately killed and are never used again. Yet, in later
1842 * optimization and analysis passes, such as compute_live_intervals, we need
1843 * to loop over all the virtual GRFs. Compacting them can save a lot of
1847 fs_visitor::compact_virtual_grfs()
1849 bool progress
= false;
1850 int remap_table
[this->alloc
.count
];
1851 memset(remap_table
, -1, sizeof(remap_table
));
1853 /* Mark which virtual GRFs are used. */
1854 foreach_block_and_inst(block
, const fs_inst
, inst
, cfg
) {
1855 if (inst
->dst
.file
== VGRF
)
1856 remap_table
[inst
->dst
.nr
] = 0;
1858 for (int i
= 0; i
< inst
->sources
; i
++) {
1859 if (inst
->src
[i
].file
== VGRF
)
1860 remap_table
[inst
->src
[i
].nr
] = 0;
1864 /* Compact the GRF arrays. */
1866 for (unsigned i
= 0; i
< this->alloc
.count
; i
++) {
1867 if (remap_table
[i
] == -1) {
1868 /* We just found an unused register. This means that we are
1869 * actually going to compact something.
1873 remap_table
[i
] = new_index
;
1874 alloc
.sizes
[new_index
] = alloc
.sizes
[i
];
1875 invalidate_live_intervals();
1880 this->alloc
.count
= new_index
;
1882 /* Patch all the instructions to use the newly renumbered registers */
1883 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1884 if (inst
->dst
.file
== VGRF
)
1885 inst
->dst
.nr
= remap_table
[inst
->dst
.nr
];
1887 for (int i
= 0; i
< inst
->sources
; i
++) {
1888 if (inst
->src
[i
].file
== VGRF
)
1889 inst
->src
[i
].nr
= remap_table
[inst
->src
[i
].nr
];
1893 /* Patch all the references to delta_xy, since they're used in register
1894 * allocation. If they're unused, switch them to BAD_FILE so we don't
1895 * think some random VGRF is delta_xy.
1897 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
1898 if (delta_xy
[i
].file
== VGRF
) {
1899 if (remap_table
[delta_xy
[i
].nr
] != -1) {
1900 delta_xy
[i
].nr
= remap_table
[delta_xy
[i
].nr
];
1902 delta_xy
[i
].file
= BAD_FILE
;
1911 get_subgroup_id_param_index(const brw_stage_prog_data
*prog_data
)
1913 if (prog_data
->nr_params
== 0)
1916 /* The local thread id is always the last parameter in the list */
1917 uint32_t last_param
= prog_data
->param
[prog_data
->nr_params
- 1];
1918 if (last_param
== BRW_PARAM_BUILTIN_SUBGROUP_ID
)
1919 return prog_data
->nr_params
- 1;
1925 * Struct for handling complex alignments.
1927 * A complex alignment is stored as multiplier and an offset. A value is
1928 * considered to be aligned if it is {offset} larger than a multiple of {mul}.
1929 * For instance, with an alignment of {8, 2}, cplx_align_apply would do the
1932 * N | cplx_align_apply({8, 2}, N)
1933 * ----+-----------------------------
1947 #define CPLX_ALIGN_MAX_MUL 8
1950 cplx_align_assert_sane(struct cplx_align a
)
1952 assert(a
.mul
> 0 && util_is_power_of_two(a
.mul
));
1953 assert(a
.offset
< a
.mul
);
1957 * Combines two alignments to produce a least multiple of sorts.
1959 * The returned alignment is the smallest (in terms of multiplier) such that
1960 * anything aligned to both a and b will be aligned to the new alignment.
1961 * This function will assert-fail if a and b are not compatible, i.e. if the
1962 * offset parameters are such that no common alignment is possible.
1964 static struct cplx_align
1965 cplx_align_combine(struct cplx_align a
, struct cplx_align b
)
1967 cplx_align_assert_sane(a
);
1968 cplx_align_assert_sane(b
);
1970 /* Assert that the alignments agree. */
1971 assert((a
.offset
& (b
.mul
- 1)) == (b
.offset
& (a
.mul
- 1)));
1973 return a
.mul
> b
.mul
? a
: b
;
1977 * Apply a complex alignment
1979 * This function will return the smallest number greater than or equal to
1980 * offset that is aligned to align.
1983 cplx_align_apply(struct cplx_align align
, unsigned offset
)
1985 return ALIGN(offset
- align
.offset
, align
.mul
) + align
.offset
;
1988 #define UNIFORM_SLOT_SIZE 4
1990 struct uniform_slot_info
{
1991 /** True if the given uniform slot is live */
1994 /** True if this slot and the next slot must remain contiguous */
1995 unsigned contiguous
:1;
1997 struct cplx_align align
;
2001 mark_uniform_slots_read(struct uniform_slot_info
*slots
,
2002 unsigned num_slots
, unsigned alignment
)
2004 assert(alignment
> 0 && util_is_power_of_two(alignment
));
2005 assert(alignment
<= CPLX_ALIGN_MAX_MUL
);
2007 /* We can't align a slot to anything less than the slot size */
2008 alignment
= MAX2(alignment
, UNIFORM_SLOT_SIZE
);
2010 struct cplx_align align
= {alignment
, 0};
2011 cplx_align_assert_sane(align
);
2013 for (unsigned i
= 0; i
< num_slots
; i
++) {
2014 slots
[i
].is_live
= true;
2015 if (i
< num_slots
- 1)
2016 slots
[i
].contiguous
= true;
2018 align
.offset
= (i
* UNIFORM_SLOT_SIZE
) & (align
.mul
- 1);
2019 if (slots
[i
].align
.mul
== 0) {
2020 slots
[i
].align
= align
;
2022 slots
[i
].align
= cplx_align_combine(slots
[i
].align
, align
);
2028 * Assign UNIFORM file registers to either push constants or pull constants.
2030 * We allow a fragment shader to have more than the specified minimum
2031 * maximum number of fragment shader uniform components (64). If
2032 * there are too many of these, they'd fill up all of register space.
2033 * So, this will push some of them out to the pull constant buffer and
2034 * update the program to load them.
2037 fs_visitor::assign_constant_locations()
2039 /* Only the first compile gets to decide on locations. */
2040 if (push_constant_loc
) {
2041 assert(pull_constant_loc
);
2045 struct uniform_slot_info slots
[uniforms
];
2046 memset(slots
, 0, sizeof(slots
));
2048 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2049 for (int i
= 0 ; i
< inst
->sources
; i
++) {
2050 if (inst
->src
[i
].file
!= UNIFORM
)
2053 /* NIR tightly packs things so the uniform number might not be
2054 * aligned (if we have a double right after a float, for instance).
2055 * This is fine because the process of re-arranging them will ensure
2056 * that things are properly aligned. The offset into that uniform,
2057 * however, must be aligned.
2059 * In Vulkan, we have explicit offsets but everything is crammed
2060 * into a single "variable" so inst->src[i].nr will always be 0.
2061 * Everything will be properly aligned relative to that one base.
2063 assert(inst
->src
[i
].offset
% type_sz(inst
->src
[i
].type
) == 0);
2065 unsigned u
= inst
->src
[i
].nr
+
2066 inst
->src
[i
].offset
/ UNIFORM_SLOT_SIZE
;
2071 unsigned slots_read
;
2072 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&& i
== 0) {
2073 slots_read
= DIV_ROUND_UP(inst
->src
[2].ud
, UNIFORM_SLOT_SIZE
);
2075 unsigned bytes_read
= inst
->components_read(i
) *
2076 type_sz(inst
->src
[i
].type
);
2077 slots_read
= DIV_ROUND_UP(bytes_read
, UNIFORM_SLOT_SIZE
);
2080 assert(u
+ slots_read
<= uniforms
);
2081 mark_uniform_slots_read(&slots
[u
], slots_read
,
2082 type_sz(inst
->src
[i
].type
));
2086 int subgroup_id_index
= get_subgroup_id_param_index(stage_prog_data
);
2088 /* Only allow 16 registers (128 uniform components) as push constants.
2090 * Just demote the end of the list. We could probably do better
2091 * here, demoting things that are rarely used in the program first.
2093 * If changing this value, note the limitation about total_regs in
2096 unsigned int max_push_components
= 16 * 8;
2097 if (subgroup_id_index
>= 0)
2098 max_push_components
--; /* Save a slot for the thread ID */
2100 /* We push small arrays, but no bigger than 16 floats. This is big enough
2101 * for a vec4 but hopefully not large enough to push out other stuff. We
2102 * should probably use a better heuristic at some point.
2104 const unsigned int max_chunk_size
= 16;
2106 unsigned int num_push_constants
= 0;
2107 unsigned int num_pull_constants
= 0;
2109 push_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2110 pull_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2112 /* Default to -1 meaning no location */
2113 memset(push_constant_loc
, -1, uniforms
* sizeof(*push_constant_loc
));
2114 memset(pull_constant_loc
, -1, uniforms
* sizeof(*pull_constant_loc
));
2116 int chunk_start
= -1;
2117 struct cplx_align align
;
2118 for (unsigned u
= 0; u
< uniforms
; u
++) {
2119 if (!slots
[u
].is_live
) {
2120 assert(chunk_start
== -1);
2124 /* Skip subgroup_id_index to put it in the last push register. */
2125 if (subgroup_id_index
== (int)u
)
2128 if (chunk_start
== -1) {
2130 align
= slots
[u
].align
;
2132 /* Offset into the chunk */
2133 unsigned chunk_offset
= (u
- chunk_start
) * UNIFORM_SLOT_SIZE
;
2135 /* Shift the slot alignment down by the chunk offset so it is
2136 * comparable with the base chunk alignment.
2138 struct cplx_align slot_align
= slots
[u
].align
;
2140 (slot_align
.offset
- chunk_offset
) & (align
.mul
- 1);
2142 align
= cplx_align_combine(align
, slot_align
);
2145 /* Sanity check the alignment */
2146 cplx_align_assert_sane(align
);
2148 if (slots
[u
].contiguous
)
2151 /* Adjust the alignment to be in terms of slots, not bytes */
2152 assert((align
.mul
& (UNIFORM_SLOT_SIZE
- 1)) == 0);
2153 assert((align
.offset
& (UNIFORM_SLOT_SIZE
- 1)) == 0);
2154 align
.mul
/= UNIFORM_SLOT_SIZE
;
2155 align
.offset
/= UNIFORM_SLOT_SIZE
;
2157 unsigned push_start_align
= cplx_align_apply(align
, num_push_constants
);
2158 unsigned chunk_size
= u
- chunk_start
+ 1;
2159 if ((!compiler
->supports_pull_constants
&& u
< UBO_START
) ||
2160 (chunk_size
< max_chunk_size
&&
2161 push_start_align
+ chunk_size
<= max_push_components
)) {
2162 /* Align up the number of push constants */
2163 num_push_constants
= push_start_align
;
2164 for (unsigned i
= 0; i
< chunk_size
; i
++)
2165 push_constant_loc
[chunk_start
+ i
] = num_push_constants
++;
2167 /* We need to pull this one */
2168 num_pull_constants
= cplx_align_apply(align
, num_pull_constants
);
2169 for (unsigned i
= 0; i
< chunk_size
; i
++)
2170 pull_constant_loc
[chunk_start
+ i
] = num_pull_constants
++;
2173 /* Reset the chunk and start again */
2177 /* Add the CS local thread ID uniform at the end of the push constants */
2178 if (subgroup_id_index
>= 0)
2179 push_constant_loc
[subgroup_id_index
] = num_push_constants
++;
2181 /* As the uniforms are going to be reordered, stash the old array and
2182 * create two new arrays for push/pull params.
2184 uint32_t *param
= stage_prog_data
->param
;
2185 stage_prog_data
->nr_params
= num_push_constants
;
2186 if (num_push_constants
) {
2187 stage_prog_data
->param
= rzalloc_array(mem_ctx
, uint32_t,
2188 num_push_constants
);
2190 stage_prog_data
->param
= NULL
;
2192 assert(stage_prog_data
->nr_pull_params
== 0);
2193 assert(stage_prog_data
->pull_param
== NULL
);
2194 if (num_pull_constants
> 0) {
2195 stage_prog_data
->nr_pull_params
= num_pull_constants
;
2196 stage_prog_data
->pull_param
= rzalloc_array(mem_ctx
, uint32_t,
2197 num_pull_constants
);
2200 /* Now that we know how many regular uniforms we'll push, reduce the
2201 * UBO push ranges so we don't exceed the 3DSTATE_CONSTANT limits.
2203 unsigned push_length
= DIV_ROUND_UP(stage_prog_data
->nr_params
, 8);
2204 for (int i
= 0; i
< 4; i
++) {
2205 struct brw_ubo_range
*range
= &prog_data
->ubo_ranges
[i
];
2207 if (push_length
+ range
->length
> 64)
2208 range
->length
= 64 - push_length
;
2210 push_length
+= range
->length
;
2212 assert(push_length
<= 64);
2214 /* Up until now, the param[] array has been indexed by reg + offset
2215 * of UNIFORM registers. Move pull constants into pull_param[] and
2216 * condense param[] to only contain the uniforms we chose to push.
2218 * NOTE: Because we are condensing the params[] array, we know that
2219 * push_constant_loc[i] <= i and we can do it in one smooth loop without
2220 * having to make a copy.
2222 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2223 uint32_t value
= param
[i
];
2224 if (pull_constant_loc
[i
] != -1) {
2225 stage_prog_data
->pull_param
[pull_constant_loc
[i
]] = value
;
2226 } else if (push_constant_loc
[i
] != -1) {
2227 stage_prog_data
->param
[push_constant_loc
[i
]] = value
;
2234 fs_visitor::get_pull_locs(const fs_reg
&src
,
2235 unsigned *out_surf_index
,
2236 unsigned *out_pull_index
)
2238 assert(src
.file
== UNIFORM
);
2240 if (src
.nr
>= UBO_START
) {
2241 const struct brw_ubo_range
*range
=
2242 &prog_data
->ubo_ranges
[src
.nr
- UBO_START
];
2244 /* If this access is in our (reduced) range, use the push data. */
2245 if (src
.offset
/ 32 < range
->length
)
2248 *out_surf_index
= prog_data
->binding_table
.ubo_start
+ range
->block
;
2249 *out_pull_index
= (32 * range
->start
+ src
.offset
) / 4;
2253 const unsigned location
= src
.nr
+ src
.offset
/ 4;
2255 if (location
< uniforms
&& pull_constant_loc
[location
] != -1) {
2256 /* A regular uniform push constant */
2257 *out_surf_index
= stage_prog_data
->binding_table
.pull_constants_start
;
2258 *out_pull_index
= pull_constant_loc
[location
];
2266 * Replace UNIFORM register file access with either UNIFORM_PULL_CONSTANT_LOAD
2267 * or VARYING_PULL_CONSTANT_LOAD instructions which load values into VGRFs.
2270 fs_visitor::lower_constant_loads()
2272 unsigned index
, pull_index
;
2274 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2275 /* Set up the annotation tracking for new generated instructions. */
2276 const fs_builder
ibld(this, block
, inst
);
2278 for (int i
= 0; i
< inst
->sources
; i
++) {
2279 if (inst
->src
[i
].file
!= UNIFORM
)
2282 /* We'll handle this case later */
2283 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&& i
== 0)
2286 if (!get_pull_locs(inst
->src
[i
], &index
, &pull_index
))
2289 assert(inst
->src
[i
].stride
== 0);
2291 const unsigned block_sz
= 64; /* Fetch one cacheline at a time. */
2292 const fs_builder ubld
= ibld
.exec_all().group(block_sz
/ 4, 0);
2293 const fs_reg dst
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
2294 const unsigned base
= pull_index
* 4;
2296 ubld
.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
,
2297 dst
, brw_imm_ud(index
), brw_imm_ud(base
& ~(block_sz
- 1)));
2299 /* Rewrite the instruction to use the temporary VGRF. */
2300 inst
->src
[i
].file
= VGRF
;
2301 inst
->src
[i
].nr
= dst
.nr
;
2302 inst
->src
[i
].offset
= (base
& (block_sz
- 1)) +
2303 inst
->src
[i
].offset
% 4;
2305 brw_mark_surface_used(prog_data
, index
);
2308 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&&
2309 inst
->src
[0].file
== UNIFORM
) {
2311 if (!get_pull_locs(inst
->src
[0], &index
, &pull_index
))
2314 VARYING_PULL_CONSTANT_LOAD(ibld
, inst
->dst
,
2318 inst
->remove(block
);
2320 brw_mark_surface_used(prog_data
, index
);
2323 invalidate_live_intervals();
2327 fs_visitor::opt_algebraic()
2329 bool progress
= false;
2331 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2332 switch (inst
->opcode
) {
2333 case BRW_OPCODE_MOV
:
2334 if (inst
->src
[0].file
!= IMM
)
2337 if (inst
->saturate
) {
2338 if (inst
->dst
.type
!= inst
->src
[0].type
)
2339 assert(!"unimplemented: saturate mixed types");
2341 if (brw_saturate_immediate(inst
->dst
.type
,
2342 &inst
->src
[0].as_brw_reg())) {
2343 inst
->saturate
= false;
2349 case BRW_OPCODE_MUL
:
2350 if (inst
->src
[1].file
!= IMM
)
2354 if (inst
->src
[1].is_one()) {
2355 inst
->opcode
= BRW_OPCODE_MOV
;
2356 inst
->src
[1] = reg_undef
;
2362 if (inst
->src
[1].is_negative_one()) {
2363 inst
->opcode
= BRW_OPCODE_MOV
;
2364 inst
->src
[0].negate
= !inst
->src
[0].negate
;
2365 inst
->src
[1] = reg_undef
;
2371 if (inst
->src
[1].is_zero()) {
2372 inst
->opcode
= BRW_OPCODE_MOV
;
2373 inst
->src
[0] = inst
->src
[1];
2374 inst
->src
[1] = reg_undef
;
2379 if (inst
->src
[0].file
== IMM
) {
2380 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
2381 inst
->opcode
= BRW_OPCODE_MOV
;
2382 inst
->src
[0].f
*= inst
->src
[1].f
;
2383 inst
->src
[1] = reg_undef
;
2388 case BRW_OPCODE_ADD
:
2389 if (inst
->src
[1].file
!= IMM
)
2393 if (inst
->src
[1].is_zero()) {
2394 inst
->opcode
= BRW_OPCODE_MOV
;
2395 inst
->src
[1] = reg_undef
;
2400 if (inst
->src
[0].file
== IMM
) {
2401 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
2402 inst
->opcode
= BRW_OPCODE_MOV
;
2403 inst
->src
[0].f
+= inst
->src
[1].f
;
2404 inst
->src
[1] = reg_undef
;
2410 if (inst
->src
[0].equals(inst
->src
[1])) {
2411 inst
->opcode
= BRW_OPCODE_MOV
;
2412 inst
->src
[1] = reg_undef
;
2417 case BRW_OPCODE_LRP
:
2418 if (inst
->src
[1].equals(inst
->src
[2])) {
2419 inst
->opcode
= BRW_OPCODE_MOV
;
2420 inst
->src
[0] = inst
->src
[1];
2421 inst
->src
[1] = reg_undef
;
2422 inst
->src
[2] = reg_undef
;
2427 case BRW_OPCODE_CMP
:
2428 if (inst
->conditional_mod
== BRW_CONDITIONAL_GE
&&
2430 inst
->src
[0].negate
&&
2431 inst
->src
[1].is_zero()) {
2432 inst
->src
[0].abs
= false;
2433 inst
->src
[0].negate
= false;
2434 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2439 case BRW_OPCODE_SEL
:
2440 if (inst
->src
[0].equals(inst
->src
[1])) {
2441 inst
->opcode
= BRW_OPCODE_MOV
;
2442 inst
->src
[1] = reg_undef
;
2443 inst
->predicate
= BRW_PREDICATE_NONE
;
2444 inst
->predicate_inverse
= false;
2446 } else if (inst
->saturate
&& inst
->src
[1].file
== IMM
) {
2447 switch (inst
->conditional_mod
) {
2448 case BRW_CONDITIONAL_LE
:
2449 case BRW_CONDITIONAL_L
:
2450 switch (inst
->src
[1].type
) {
2451 case BRW_REGISTER_TYPE_F
:
2452 if (inst
->src
[1].f
>= 1.0f
) {
2453 inst
->opcode
= BRW_OPCODE_MOV
;
2454 inst
->src
[1] = reg_undef
;
2455 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2463 case BRW_CONDITIONAL_GE
:
2464 case BRW_CONDITIONAL_G
:
2465 switch (inst
->src
[1].type
) {
2466 case BRW_REGISTER_TYPE_F
:
2467 if (inst
->src
[1].f
<= 0.0f
) {
2468 inst
->opcode
= BRW_OPCODE_MOV
;
2469 inst
->src
[1] = reg_undef
;
2470 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2482 case BRW_OPCODE_MAD
:
2483 if (inst
->src
[1].is_zero() || inst
->src
[2].is_zero()) {
2484 inst
->opcode
= BRW_OPCODE_MOV
;
2485 inst
->src
[1] = reg_undef
;
2486 inst
->src
[2] = reg_undef
;
2488 } else if (inst
->src
[0].is_zero()) {
2489 inst
->opcode
= BRW_OPCODE_MUL
;
2490 inst
->src
[0] = inst
->src
[2];
2491 inst
->src
[2] = reg_undef
;
2493 } else if (inst
->src
[1].is_one()) {
2494 inst
->opcode
= BRW_OPCODE_ADD
;
2495 inst
->src
[1] = inst
->src
[2];
2496 inst
->src
[2] = reg_undef
;
2498 } else if (inst
->src
[2].is_one()) {
2499 inst
->opcode
= BRW_OPCODE_ADD
;
2500 inst
->src
[2] = reg_undef
;
2502 } else if (inst
->src
[1].file
== IMM
&& inst
->src
[2].file
== IMM
) {
2503 inst
->opcode
= BRW_OPCODE_ADD
;
2504 inst
->src
[1].f
*= inst
->src
[2].f
;
2505 inst
->src
[2] = reg_undef
;
2509 case SHADER_OPCODE_BROADCAST
:
2510 if (is_uniform(inst
->src
[0])) {
2511 inst
->opcode
= BRW_OPCODE_MOV
;
2513 inst
->force_writemask_all
= true;
2515 } else if (inst
->src
[1].file
== IMM
) {
2516 inst
->opcode
= BRW_OPCODE_MOV
;
2517 /* It's possible that the selected component will be too large and
2518 * overflow the register. This can happen if someone does a
2519 * readInvocation() from GLSL or SPIR-V and provides an OOB
2520 * invocationIndex. If this happens and we some how manage
2521 * to constant fold it in and get here, then component() may cause
2522 * us to start reading outside of the VGRF which will lead to an
2523 * assert later. Instead, just let it wrap around if it goes over
2526 const unsigned comp
= inst
->src
[1].ud
& (inst
->exec_size
- 1);
2527 inst
->src
[0] = component(inst
->src
[0], comp
);
2529 inst
->force_writemask_all
= true;
2538 /* Swap if src[0] is immediate. */
2539 if (progress
&& inst
->is_commutative()) {
2540 if (inst
->src
[0].file
== IMM
) {
2541 fs_reg tmp
= inst
->src
[1];
2542 inst
->src
[1] = inst
->src
[0];
2551 * Optimize sample messages that have constant zero values for the trailing
2552 * texture coordinates. We can just reduce the message length for these
2553 * instructions instead of reserving a register for it. Trailing parameters
2554 * that aren't sent default to zero anyway. This will cause the dead code
2555 * eliminator to remove the MOV instruction that would otherwise be emitted to
2556 * set up the zero value.
2559 fs_visitor::opt_zero_samples()
2561 /* Gen4 infers the texturing opcode based on the message length so we can't
2564 if (devinfo
->gen
< 5)
2567 bool progress
= false;
2569 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2570 if (!inst
->is_tex())
2573 fs_inst
*load_payload
= (fs_inst
*) inst
->prev
;
2575 if (load_payload
->is_head_sentinel() ||
2576 load_payload
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
2579 /* We don't want to remove the message header or the first parameter.
2580 * Removing the first parameter is not allowed, see the Haswell PRM
2581 * volume 7, page 149:
2583 * "Parameter 0 is required except for the sampleinfo message, which
2584 * has no parameter 0"
2586 while (inst
->mlen
> inst
->header_size
+ inst
->exec_size
/ 8 &&
2587 load_payload
->src
[(inst
->mlen
- inst
->header_size
) /
2588 (inst
->exec_size
/ 8) +
2589 inst
->header_size
- 1].is_zero()) {
2590 inst
->mlen
-= inst
->exec_size
/ 8;
2596 invalidate_live_intervals();
2602 * Optimize sample messages which are followed by the final RT write.
2604 * CHV, and GEN9+ can mark a texturing SEND instruction with EOT to have its
2605 * results sent directly to the framebuffer, bypassing the EU. Recognize the
2606 * final texturing results copied to the framebuffer write payload and modify
2607 * them to write to the framebuffer directly.
2610 fs_visitor::opt_sampler_eot()
2612 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2614 if (stage
!= MESA_SHADER_FRAGMENT
)
2617 if (devinfo
->gen
!= 9 && !devinfo
->is_cherryview
)
2620 /* FINISHME: It should be possible to implement this optimization when there
2621 * are multiple drawbuffers.
2623 if (key
->nr_color_regions
!= 1)
2626 /* Requires emitting a bunch of saturating MOV instructions during logical
2627 * send lowering to clamp the color payload, which the sampler unit isn't
2628 * going to do for us.
2630 if (key
->clamp_fragment_color
)
2633 /* Look for a texturing instruction immediately before the final FB_WRITE. */
2634 bblock_t
*block
= cfg
->blocks
[cfg
->num_blocks
- 1];
2635 fs_inst
*fb_write
= (fs_inst
*)block
->end();
2636 assert(fb_write
->eot
);
2637 assert(fb_write
->opcode
== FS_OPCODE_FB_WRITE_LOGICAL
);
2639 /* There wasn't one; nothing to do. */
2640 if (unlikely(fb_write
->prev
->is_head_sentinel()))
2643 fs_inst
*tex_inst
= (fs_inst
*) fb_write
->prev
;
2645 /* 3D Sampler » Messages » Message Format
2647 * “Response Length of zero is allowed on all SIMD8* and SIMD16* sampler
2648 * messages except sample+killpix, resinfo, sampleinfo, LOD, and gather4*”
2650 if (tex_inst
->opcode
!= SHADER_OPCODE_TEX_LOGICAL
&&
2651 tex_inst
->opcode
!= SHADER_OPCODE_TXD_LOGICAL
&&
2652 tex_inst
->opcode
!= SHADER_OPCODE_TXF_LOGICAL
&&
2653 tex_inst
->opcode
!= SHADER_OPCODE_TXL_LOGICAL
&&
2654 tex_inst
->opcode
!= FS_OPCODE_TXB_LOGICAL
&&
2655 tex_inst
->opcode
!= SHADER_OPCODE_TXF_CMS_LOGICAL
&&
2656 tex_inst
->opcode
!= SHADER_OPCODE_TXF_CMS_W_LOGICAL
&&
2657 tex_inst
->opcode
!= SHADER_OPCODE_TXF_UMS_LOGICAL
)
2660 /* XXX - This shouldn't be necessary. */
2661 if (tex_inst
->prev
->is_head_sentinel())
2664 /* Check that the FB write sources are fully initialized by the single
2665 * texturing instruction.
2667 for (unsigned i
= 0; i
< FB_WRITE_LOGICAL_NUM_SRCS
; i
++) {
2668 if (i
== FB_WRITE_LOGICAL_SRC_COLOR0
) {
2669 if (!fb_write
->src
[i
].equals(tex_inst
->dst
) ||
2670 fb_write
->size_read(i
) != tex_inst
->size_written
)
2672 } else if (i
!= FB_WRITE_LOGICAL_SRC_COMPONENTS
) {
2673 if (fb_write
->src
[i
].file
!= BAD_FILE
)
2678 assert(!tex_inst
->eot
); /* We can't get here twice */
2679 assert((tex_inst
->offset
& (0xff << 24)) == 0);
2681 const fs_builder
ibld(this, block
, tex_inst
);
2683 tex_inst
->offset
|= fb_write
->target
<< 24;
2684 tex_inst
->eot
= true;
2685 tex_inst
->dst
= ibld
.null_reg_ud();
2686 tex_inst
->size_written
= 0;
2687 fb_write
->remove(cfg
->blocks
[cfg
->num_blocks
- 1]);
2689 /* Marking EOT is sufficient, lower_logical_sends() will notice the EOT
2690 * flag and submit a header together with the sampler message as required
2693 invalidate_live_intervals();
2698 fs_visitor::opt_register_renaming()
2700 bool progress
= false;
2703 int remap
[alloc
.count
];
2704 memset(remap
, -1, sizeof(int) * alloc
.count
);
2706 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2707 if (inst
->opcode
== BRW_OPCODE_IF
|| inst
->opcode
== BRW_OPCODE_DO
) {
2709 } else if (inst
->opcode
== BRW_OPCODE_ENDIF
||
2710 inst
->opcode
== BRW_OPCODE_WHILE
) {
2714 /* Rewrite instruction sources. */
2715 for (int i
= 0; i
< inst
->sources
; i
++) {
2716 if (inst
->src
[i
].file
== VGRF
&&
2717 remap
[inst
->src
[i
].nr
] != -1 &&
2718 remap
[inst
->src
[i
].nr
] != inst
->src
[i
].nr
) {
2719 inst
->src
[i
].nr
= remap
[inst
->src
[i
].nr
];
2724 const int dst
= inst
->dst
.nr
;
2727 inst
->dst
.file
== VGRF
&&
2728 alloc
.sizes
[inst
->dst
.nr
] * REG_SIZE
== inst
->size_written
&&
2729 !inst
->is_partial_write()) {
2730 if (remap
[dst
] == -1) {
2733 remap
[dst
] = alloc
.allocate(regs_written(inst
));
2734 inst
->dst
.nr
= remap
[dst
];
2737 } else if (inst
->dst
.file
== VGRF
&&
2739 remap
[dst
] != dst
) {
2740 inst
->dst
.nr
= remap
[dst
];
2746 invalidate_live_intervals();
2748 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
2749 if (delta_xy
[i
].file
== VGRF
&& remap
[delta_xy
[i
].nr
] != -1) {
2750 delta_xy
[i
].nr
= remap
[delta_xy
[i
].nr
];
2759 * Remove redundant or useless discard jumps.
2761 * For example, we can eliminate jumps in the following sequence:
2763 * discard-jump (redundant with the next jump)
2764 * discard-jump (useless; jumps to the next instruction)
2768 fs_visitor::opt_redundant_discard_jumps()
2770 bool progress
= false;
2772 bblock_t
*last_bblock
= cfg
->blocks
[cfg
->num_blocks
- 1];
2774 fs_inst
*placeholder_halt
= NULL
;
2775 foreach_inst_in_block_reverse(fs_inst
, inst
, last_bblock
) {
2776 if (inst
->opcode
== FS_OPCODE_PLACEHOLDER_HALT
) {
2777 placeholder_halt
= inst
;
2782 if (!placeholder_halt
)
2785 /* Delete any HALTs immediately before the placeholder halt. */
2786 for (fs_inst
*prev
= (fs_inst
*) placeholder_halt
->prev
;
2787 !prev
->is_head_sentinel() && prev
->opcode
== FS_OPCODE_DISCARD_JUMP
;
2788 prev
= (fs_inst
*) placeholder_halt
->prev
) {
2789 prev
->remove(last_bblock
);
2794 invalidate_live_intervals();
2800 * Compute a bitmask with GRF granularity with a bit set for each GRF starting
2801 * from \p r.offset which overlaps the region starting at \p s.offset and
2802 * spanning \p ds bytes.
2804 static inline unsigned
2805 mask_relative_to(const fs_reg
&r
, const fs_reg
&s
, unsigned ds
)
2807 const int rel_offset
= reg_offset(s
) - reg_offset(r
);
2808 const int shift
= rel_offset
/ REG_SIZE
;
2809 const unsigned n
= DIV_ROUND_UP(rel_offset
% REG_SIZE
+ ds
, REG_SIZE
);
2810 assert(reg_space(r
) == reg_space(s
) &&
2811 shift
>= 0 && shift
< int(8 * sizeof(unsigned)));
2812 return ((1 << n
) - 1) << shift
;
2816 fs_visitor::compute_to_mrf()
2818 bool progress
= false;
2821 /* No MRFs on Gen >= 7. */
2822 if (devinfo
->gen
>= 7)
2825 calculate_live_intervals();
2827 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2831 if (inst
->opcode
!= BRW_OPCODE_MOV
||
2832 inst
->is_partial_write() ||
2833 inst
->dst
.file
!= MRF
|| inst
->src
[0].file
!= VGRF
||
2834 inst
->dst
.type
!= inst
->src
[0].type
||
2835 inst
->src
[0].abs
|| inst
->src
[0].negate
||
2836 !inst
->src
[0].is_contiguous() ||
2837 inst
->src
[0].offset
% REG_SIZE
!= 0)
2840 /* Can't compute-to-MRF this GRF if someone else was going to
2843 if (this->virtual_grf_end
[inst
->src
[0].nr
] > ip
)
2846 /* Found a move of a GRF to a MRF. Let's see if we can go rewrite the
2847 * things that computed the value of all GRFs of the source region. The
2848 * regs_left bitset keeps track of the registers we haven't yet found a
2849 * generating instruction for.
2851 unsigned regs_left
= (1 << regs_read(inst
, 0)) - 1;
2853 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
2854 if (regions_overlap(scan_inst
->dst
, scan_inst
->size_written
,
2855 inst
->src
[0], inst
->size_read(0))) {
2856 /* Found the last thing to write our reg we want to turn
2857 * into a compute-to-MRF.
2860 /* If this one instruction didn't populate all the
2861 * channels, bail. We might be able to rewrite everything
2862 * that writes that reg, but it would require smarter
2865 if (scan_inst
->is_partial_write())
2868 /* Handling things not fully contained in the source of the copy
2869 * would need us to understand coalescing out more than one MOV at
2872 if (!region_contained_in(scan_inst
->dst
, scan_inst
->size_written
,
2873 inst
->src
[0], inst
->size_read(0)))
2876 /* SEND instructions can't have MRF as a destination. */
2877 if (scan_inst
->mlen
)
2880 if (devinfo
->gen
== 6) {
2881 /* gen6 math instructions must have the destination be
2882 * GRF, so no compute-to-MRF for them.
2884 if (scan_inst
->is_math()) {
2889 /* Clear the bits for any registers this instruction overwrites. */
2890 regs_left
&= ~mask_relative_to(
2891 inst
->src
[0], scan_inst
->dst
, scan_inst
->size_written
);
2896 /* We don't handle control flow here. Most computation of
2897 * values that end up in MRFs are shortly before the MRF
2900 if (block
->start() == scan_inst
)
2903 /* You can't read from an MRF, so if someone else reads our
2904 * MRF's source GRF that we wanted to rewrite, that stops us.
2906 bool interfered
= false;
2907 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
2908 if (regions_overlap(scan_inst
->src
[i
], scan_inst
->size_read(i
),
2909 inst
->src
[0], inst
->size_read(0))) {
2916 if (regions_overlap(scan_inst
->dst
, scan_inst
->size_written
,
2917 inst
->dst
, inst
->size_written
)) {
2918 /* If somebody else writes our MRF here, we can't
2919 * compute-to-MRF before that.
2924 if (scan_inst
->mlen
> 0 && scan_inst
->base_mrf
!= -1 &&
2925 regions_overlap(fs_reg(MRF
, scan_inst
->base_mrf
), scan_inst
->mlen
* REG_SIZE
,
2926 inst
->dst
, inst
->size_written
)) {
2927 /* Found a SEND instruction, which means that there are
2928 * live values in MRFs from base_mrf to base_mrf +
2929 * scan_inst->mlen - 1. Don't go pushing our MRF write up
2939 /* Found all generating instructions of our MRF's source value, so it
2940 * should be safe to rewrite them to point to the MRF directly.
2942 regs_left
= (1 << regs_read(inst
, 0)) - 1;
2944 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
2945 if (regions_overlap(scan_inst
->dst
, scan_inst
->size_written
,
2946 inst
->src
[0], inst
->size_read(0))) {
2947 /* Clear the bits for any registers this instruction overwrites. */
2948 regs_left
&= ~mask_relative_to(
2949 inst
->src
[0], scan_inst
->dst
, scan_inst
->size_written
);
2951 const unsigned rel_offset
= reg_offset(scan_inst
->dst
) -
2952 reg_offset(inst
->src
[0]);
2954 if (inst
->dst
.nr
& BRW_MRF_COMPR4
) {
2955 /* Apply the same address transformation done by the hardware
2956 * for COMPR4 MRF writes.
2958 assert(rel_offset
< 2 * REG_SIZE
);
2959 scan_inst
->dst
.nr
= inst
->dst
.nr
+ rel_offset
/ REG_SIZE
* 4;
2961 /* Clear the COMPR4 bit if the generating instruction is not
2964 if (scan_inst
->size_written
< 2 * REG_SIZE
)
2965 scan_inst
->dst
.nr
&= ~BRW_MRF_COMPR4
;
2968 /* Calculate the MRF number the result of this instruction is
2969 * ultimately written to.
2971 scan_inst
->dst
.nr
= inst
->dst
.nr
+ rel_offset
/ REG_SIZE
;
2974 scan_inst
->dst
.file
= MRF
;
2975 scan_inst
->dst
.offset
= inst
->dst
.offset
+ rel_offset
% REG_SIZE
;
2976 scan_inst
->saturate
|= inst
->saturate
;
2983 inst
->remove(block
);
2988 invalidate_live_intervals();
2994 * Eliminate FIND_LIVE_CHANNEL instructions occurring outside any control
2995 * flow. We could probably do better here with some form of divergence
2999 fs_visitor::eliminate_find_live_channel()
3001 bool progress
= false;
3004 if (!brw_stage_has_packed_dispatch(devinfo
, stage
, stage_prog_data
)) {
3005 /* The optimization below assumes that channel zero is live on thread
3006 * dispatch, which may not be the case if the fixed function dispatches
3012 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3013 switch (inst
->opcode
) {
3019 case BRW_OPCODE_ENDIF
:
3020 case BRW_OPCODE_WHILE
:
3024 case FS_OPCODE_DISCARD_JUMP
:
3025 /* This can potentially make control flow non-uniform until the end
3030 case SHADER_OPCODE_FIND_LIVE_CHANNEL
:
3032 inst
->opcode
= BRW_OPCODE_MOV
;
3033 inst
->src
[0] = brw_imm_ud(0u);
3035 inst
->force_writemask_all
= true;
3049 * Once we've generated code, try to convert normal FS_OPCODE_FB_WRITE
3050 * instructions to FS_OPCODE_REP_FB_WRITE.
3053 fs_visitor::emit_repclear_shader()
3055 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
3057 int color_mrf
= base_mrf
+ 2;
3061 mov
= bld
.exec_all().group(4, 0)
3062 .MOV(brw_message_reg(color_mrf
),
3063 fs_reg(UNIFORM
, 0, BRW_REGISTER_TYPE_F
));
3065 struct brw_reg reg
=
3066 brw_reg(BRW_GENERAL_REGISTER_FILE
, 2, 3, 0, 0, BRW_REGISTER_TYPE_F
,
3067 BRW_VERTICAL_STRIDE_8
, BRW_WIDTH_2
, BRW_HORIZONTAL_STRIDE_4
,
3068 BRW_SWIZZLE_XYZW
, WRITEMASK_XYZW
);
3070 mov
= bld
.exec_all().group(4, 0)
3071 .MOV(vec4(brw_message_reg(color_mrf
)), fs_reg(reg
));
3074 fs_inst
*write
= NULL
;
3075 if (key
->nr_color_regions
== 1) {
3076 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
3077 write
->saturate
= key
->clamp_fragment_color
;
3078 write
->base_mrf
= color_mrf
;
3080 write
->header_size
= 0;
3083 assume(key
->nr_color_regions
> 0);
3084 for (int i
= 0; i
< key
->nr_color_regions
; ++i
) {
3085 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
3086 write
->saturate
= key
->clamp_fragment_color
;
3087 write
->base_mrf
= base_mrf
;
3089 write
->header_size
= 2;
3097 assign_constant_locations();
3098 assign_curb_setup();
3100 /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
3102 assert(mov
->src
[0].file
== FIXED_GRF
);
3103 mov
->src
[0] = brw_vec4_grf(mov
->src
[0].nr
, 0);
3108 * Walks through basic blocks, looking for repeated MRF writes and
3109 * removing the later ones.
3112 fs_visitor::remove_duplicate_mrf_writes()
3114 fs_inst
*last_mrf_move
[BRW_MAX_MRF(devinfo
->gen
)];
3115 bool progress
= false;
3117 /* Need to update the MRF tracking for compressed instructions. */
3118 if (dispatch_width
>= 16)
3121 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
3123 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3124 if (inst
->is_control_flow()) {
3125 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
3128 if (inst
->opcode
== BRW_OPCODE_MOV
&&
3129 inst
->dst
.file
== MRF
) {
3130 fs_inst
*prev_inst
= last_mrf_move
[inst
->dst
.nr
];
3131 if (prev_inst
&& inst
->equals(prev_inst
)) {
3132 inst
->remove(block
);
3138 /* Clear out the last-write records for MRFs that were overwritten. */
3139 if (inst
->dst
.file
== MRF
) {
3140 last_mrf_move
[inst
->dst
.nr
] = NULL
;
3143 if (inst
->mlen
> 0 && inst
->base_mrf
!= -1) {
3144 /* Found a SEND instruction, which will include two or fewer
3145 * implied MRF writes. We could do better here.
3147 for (int i
= 0; i
< implied_mrf_writes(inst
); i
++) {
3148 last_mrf_move
[inst
->base_mrf
+ i
] = NULL
;
3152 /* Clear out any MRF move records whose sources got overwritten. */
3153 for (unsigned i
= 0; i
< ARRAY_SIZE(last_mrf_move
); i
++) {
3154 if (last_mrf_move
[i
] &&
3155 regions_overlap(inst
->dst
, inst
->size_written
,
3156 last_mrf_move
[i
]->src
[0],
3157 last_mrf_move
[i
]->size_read(0))) {
3158 last_mrf_move
[i
] = NULL
;
3162 if (inst
->opcode
== BRW_OPCODE_MOV
&&
3163 inst
->dst
.file
== MRF
&&
3164 inst
->src
[0].file
!= ARF
&&
3165 !inst
->is_partial_write()) {
3166 last_mrf_move
[inst
->dst
.nr
] = inst
;
3171 invalidate_live_intervals();
3177 * Rounding modes for conversion instructions are included for each
3178 * conversion, but right now it is a state. So once it is set,
3179 * we don't need to call it again for subsequent calls.
3181 * This is useful for vector/matrices conversions, as setting the
3182 * mode once is enough for the full vector/matrix
3185 fs_visitor::remove_extra_rounding_modes()
3187 bool progress
= false;
3189 foreach_block (block
, cfg
) {
3190 brw_rnd_mode prev_mode
= BRW_RND_MODE_UNSPECIFIED
;
3192 foreach_inst_in_block_safe (fs_inst
, inst
, block
) {
3193 if (inst
->opcode
== SHADER_OPCODE_RND_MODE
) {
3194 assert(inst
->src
[0].file
== BRW_IMMEDIATE_VALUE
);
3195 const brw_rnd_mode mode
= (brw_rnd_mode
) inst
->src
[0].d
;
3196 if (mode
== prev_mode
) {
3197 inst
->remove(block
);
3207 invalidate_live_intervals();
3213 clear_deps_for_inst_src(fs_inst
*inst
, bool *deps
, int first_grf
, int grf_len
)
3215 /* Clear the flag for registers that actually got read (as expected). */
3216 for (int i
= 0; i
< inst
->sources
; i
++) {
3218 if (inst
->src
[i
].file
== VGRF
|| inst
->src
[i
].file
== FIXED_GRF
) {
3219 grf
= inst
->src
[i
].nr
;
3224 if (grf
>= first_grf
&&
3225 grf
< first_grf
+ grf_len
) {
3226 deps
[grf
- first_grf
] = false;
3227 if (inst
->exec_size
== 16)
3228 deps
[grf
- first_grf
+ 1] = false;
3234 * Implements this workaround for the original 965:
3236 * "[DevBW, DevCL] Implementation Restrictions: As the hardware does not
3237 * check for post destination dependencies on this instruction, software
3238 * must ensure that there is no destination hazard for the case of ‘write
3239 * followed by a posted write’ shown in the following example.
3242 * 2. send r3.xy <rest of send instruction>
3245 * Due to no post-destination dependency check on the ‘send’, the above
3246 * code sequence could have two instructions (1 and 2) in flight at the
3247 * same time that both consider ‘r3’ as the target of their final writes.
3250 fs_visitor::insert_gen4_pre_send_dependency_workarounds(bblock_t
*block
,
3253 int write_len
= regs_written(inst
);
3254 int first_write_grf
= inst
->dst
.nr
;
3255 bool needs_dep
[BRW_MAX_MRF(devinfo
->gen
)];
3256 assert(write_len
< (int)sizeof(needs_dep
) - 1);
3258 memset(needs_dep
, false, sizeof(needs_dep
));
3259 memset(needs_dep
, true, write_len
);
3261 clear_deps_for_inst_src(inst
, needs_dep
, first_write_grf
, write_len
);
3263 /* Walk backwards looking for writes to registers we're writing which
3264 * aren't read since being written. If we hit the start of the program,
3265 * we assume that there are no outstanding dependencies on entry to the
3268 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
3269 /* If we hit control flow, assume that there *are* outstanding
3270 * dependencies, and force their cleanup before our instruction.
3272 if (block
->start() == scan_inst
&& block
->num
!= 0) {
3273 for (int i
= 0; i
< write_len
; i
++) {
3275 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
),
3276 first_write_grf
+ i
);
3281 /* We insert our reads as late as possible on the assumption that any
3282 * instruction but a MOV that might have left us an outstanding
3283 * dependency has more latency than a MOV.
3285 if (scan_inst
->dst
.file
== VGRF
) {
3286 for (unsigned i
= 0; i
< regs_written(scan_inst
); i
++) {
3287 int reg
= scan_inst
->dst
.nr
+ i
;
3289 if (reg
>= first_write_grf
&&
3290 reg
< first_write_grf
+ write_len
&&
3291 needs_dep
[reg
- first_write_grf
]) {
3292 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
), reg
);
3293 needs_dep
[reg
- first_write_grf
] = false;
3294 if (scan_inst
->exec_size
== 16)
3295 needs_dep
[reg
- first_write_grf
+ 1] = false;
3300 /* Clear the flag for registers that actually got read (as expected). */
3301 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
3303 /* Continue the loop only if we haven't resolved all the dependencies */
3305 for (i
= 0; i
< write_len
; i
++) {
3315 * Implements this workaround for the original 965:
3317 * "[DevBW, DevCL] Errata: A destination register from a send can not be
3318 * used as a destination register until after it has been sourced by an
3319 * instruction with a different destination register.
3322 fs_visitor::insert_gen4_post_send_dependency_workarounds(bblock_t
*block
, fs_inst
*inst
)
3324 int write_len
= regs_written(inst
);
3325 int first_write_grf
= inst
->dst
.nr
;
3326 bool needs_dep
[BRW_MAX_MRF(devinfo
->gen
)];
3327 assert(write_len
< (int)sizeof(needs_dep
) - 1);
3329 memset(needs_dep
, false, sizeof(needs_dep
));
3330 memset(needs_dep
, true, write_len
);
3331 /* Walk forwards looking for writes to registers we're writing which aren't
3332 * read before being written.
3334 foreach_inst_in_block_starting_from(fs_inst
, scan_inst
, inst
) {
3335 /* If we hit control flow, force resolve all remaining dependencies. */
3336 if (block
->end() == scan_inst
&& block
->num
!= cfg
->num_blocks
- 1) {
3337 for (int i
= 0; i
< write_len
; i
++) {
3339 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
3340 first_write_grf
+ i
);
3345 /* Clear the flag for registers that actually got read (as expected). */
3346 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
3348 /* We insert our reads as late as possible since they're reading the
3349 * result of a SEND, which has massive latency.
3351 if (scan_inst
->dst
.file
== VGRF
&&
3352 scan_inst
->dst
.nr
>= first_write_grf
&&
3353 scan_inst
->dst
.nr
< first_write_grf
+ write_len
&&
3354 needs_dep
[scan_inst
->dst
.nr
- first_write_grf
]) {
3355 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
3357 needs_dep
[scan_inst
->dst
.nr
- first_write_grf
] = false;
3360 /* Continue the loop only if we haven't resolved all the dependencies */
3362 for (i
= 0; i
< write_len
; i
++) {
3372 fs_visitor::insert_gen4_send_dependency_workarounds()
3374 if (devinfo
->gen
!= 4 || devinfo
->is_g4x
)
3377 bool progress
= false;
3379 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
3380 if (inst
->mlen
!= 0 && inst
->dst
.file
== VGRF
) {
3381 insert_gen4_pre_send_dependency_workarounds(block
, inst
);
3382 insert_gen4_post_send_dependency_workarounds(block
, inst
);
3388 invalidate_live_intervals();
3392 * Turns the generic expression-style uniform pull constant load instruction
3393 * into a hardware-specific series of instructions for loading a pull
3396 * The expression style allows the CSE pass before this to optimize out
3397 * repeated loads from the same offset, and gives the pre-register-allocation
3398 * scheduling full flexibility, while the conversion to native instructions
3399 * allows the post-register-allocation scheduler the best information
3402 * Note that execution masking for setting up pull constant loads is special:
3403 * the channels that need to be written are unrelated to the current execution
3404 * mask, since a later instruction will use one of the result channels as a
3405 * source operand for all 8 or 16 of its channels.
3408 fs_visitor::lower_uniform_pull_constant_loads()
3410 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
3411 if (inst
->opcode
!= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
)
3414 if (devinfo
->gen
>= 7) {
3415 const fs_builder ubld
= fs_builder(this, block
, inst
).exec_all();
3416 const fs_reg payload
= ubld
.group(8, 0).vgrf(BRW_REGISTER_TYPE_UD
);
3418 ubld
.group(8, 0).MOV(payload
,
3419 retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD
));
3420 ubld
.group(1, 0).MOV(component(payload
, 2),
3421 brw_imm_ud(inst
->src
[1].ud
/ 16));
3423 inst
->opcode
= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
;
3424 inst
->src
[1] = payload
;
3425 inst
->header_size
= 1;
3428 invalidate_live_intervals();
3430 /* Before register allocation, we didn't tell the scheduler about the
3431 * MRF we use. We know it's safe to use this MRF because nothing
3432 * else does except for register spill/unspill, which generates and
3433 * uses its MRF within a single IR instruction.
3435 inst
->base_mrf
= FIRST_PULL_LOAD_MRF(devinfo
->gen
) + 1;
3442 fs_visitor::lower_load_payload()
3444 bool progress
= false;
3446 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3447 if (inst
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
3450 assert(inst
->dst
.file
== MRF
|| inst
->dst
.file
== VGRF
);
3451 assert(inst
->saturate
== false);
3452 fs_reg dst
= inst
->dst
;
3454 /* Get rid of COMPR4. We'll add it back in if we need it */
3455 if (dst
.file
== MRF
)
3456 dst
.nr
= dst
.nr
& ~BRW_MRF_COMPR4
;
3458 const fs_builder
ibld(this, block
, inst
);
3459 const fs_builder hbld
= ibld
.exec_all().group(8, 0);
3461 for (uint8_t i
= 0; i
< inst
->header_size
; i
++) {
3462 if (inst
->src
[i
].file
!= BAD_FILE
) {
3463 fs_reg mov_dst
= retype(dst
, BRW_REGISTER_TYPE_UD
);
3464 fs_reg mov_src
= retype(inst
->src
[i
], BRW_REGISTER_TYPE_UD
);
3465 hbld
.MOV(mov_dst
, mov_src
);
3467 dst
= offset(dst
, hbld
, 1);
3470 if (inst
->dst
.file
== MRF
&& (inst
->dst
.nr
& BRW_MRF_COMPR4
) &&
3471 inst
->exec_size
> 8) {
3472 /* In this case, the payload portion of the LOAD_PAYLOAD isn't
3473 * a straightforward copy. Instead, the result of the
3474 * LOAD_PAYLOAD is treated as interleaved and the first four
3475 * non-header sources are unpacked as:
3486 * This is used for gen <= 5 fb writes.
3488 assert(inst
->exec_size
== 16);
3489 assert(inst
->header_size
+ 4 <= inst
->sources
);
3490 for (uint8_t i
= inst
->header_size
; i
< inst
->header_size
+ 4; i
++) {
3491 if (inst
->src
[i
].file
!= BAD_FILE
) {
3492 if (devinfo
->has_compr4
) {
3493 fs_reg compr4_dst
= retype(dst
, inst
->src
[i
].type
);
3494 compr4_dst
.nr
|= BRW_MRF_COMPR4
;
3495 ibld
.MOV(compr4_dst
, inst
->src
[i
]);
3497 /* Platform doesn't have COMPR4. We have to fake it */
3498 fs_reg mov_dst
= retype(dst
, inst
->src
[i
].type
);
3499 ibld
.half(0).MOV(mov_dst
, half(inst
->src
[i
], 0));
3501 ibld
.half(1).MOV(mov_dst
, half(inst
->src
[i
], 1));
3508 /* The loop above only ever incremented us through the first set
3509 * of 4 registers. However, thanks to the magic of COMPR4, we
3510 * actually wrote to the first 8 registers, so we need to take
3511 * that into account now.
3515 /* The COMPR4 code took care of the first 4 sources. We'll let
3516 * the regular path handle any remaining sources. Yes, we are
3517 * modifying the instruction but we're about to delete it so
3518 * this really doesn't hurt anything.
3520 inst
->header_size
+= 4;
3523 for (uint8_t i
= inst
->header_size
; i
< inst
->sources
; i
++) {
3524 if (inst
->src
[i
].file
!= BAD_FILE
)
3525 ibld
.MOV(retype(dst
, inst
->src
[i
].type
), inst
->src
[i
]);
3526 dst
= offset(dst
, ibld
, 1);
3529 inst
->remove(block
);
3534 invalidate_live_intervals();
3540 fs_visitor::lower_integer_multiplication()
3542 bool progress
= false;
3544 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3545 const fs_builder
ibld(this, block
, inst
);
3547 if (inst
->opcode
== BRW_OPCODE_MUL
) {
3548 if (inst
->dst
.is_accumulator() ||
3549 (inst
->dst
.type
!= BRW_REGISTER_TYPE_D
&&
3550 inst
->dst
.type
!= BRW_REGISTER_TYPE_UD
))
3553 if (devinfo
->has_integer_dword_mul
)
3556 if (inst
->src
[1].file
== IMM
&&
3557 inst
->src
[1].ud
< (1 << 16)) {
3558 /* The MUL instruction isn't commutative. On Gen <= 6, only the low
3559 * 16-bits of src0 are read, and on Gen >= 7 only the low 16-bits of
3562 * If multiplying by an immediate value that fits in 16-bits, do a
3563 * single MUL instruction with that value in the proper location.
3565 if (devinfo
->gen
< 7) {
3566 fs_reg
imm(VGRF
, alloc
.allocate(dispatch_width
/ 8),
3568 ibld
.MOV(imm
, inst
->src
[1]);
3569 ibld
.MUL(inst
->dst
, imm
, inst
->src
[0]);
3571 const bool ud
= (inst
->src
[1].type
== BRW_REGISTER_TYPE_UD
);
3572 ibld
.MUL(inst
->dst
, inst
->src
[0],
3573 ud
? brw_imm_uw(inst
->src
[1].ud
)
3574 : brw_imm_w(inst
->src
[1].d
));
3577 /* Gen < 8 (and some Gen8+ low-power parts like Cherryview) cannot
3578 * do 32-bit integer multiplication in one instruction, but instead
3579 * must do a sequence (which actually calculates a 64-bit result):
3581 * mul(8) acc0<1>D g3<8,8,1>D g4<8,8,1>D
3582 * mach(8) null g3<8,8,1>D g4<8,8,1>D
3583 * mov(8) g2<1>D acc0<8,8,1>D
3585 * But on Gen > 6, the ability to use second accumulator register
3586 * (acc1) for non-float data types was removed, preventing a simple
3587 * implementation in SIMD16. A 16-channel result can be calculated by
3588 * executing the three instructions twice in SIMD8, once with quarter
3589 * control of 1Q for the first eight channels and again with 2Q for
3590 * the second eight channels.
3592 * Which accumulator register is implicitly accessed (by AccWrEnable
3593 * for instance) is determined by the quarter control. Unfortunately
3594 * Ivybridge (and presumably Baytrail) has a hardware bug in which an
3595 * implicit accumulator access by an instruction with 2Q will access
3596 * acc1 regardless of whether the data type is usable in acc1.
3598 * Specifically, the 2Q mach(8) writes acc1 which does not exist for
3599 * integer data types.
3601 * Since we only want the low 32-bits of the result, we can do two
3602 * 32-bit x 16-bit multiplies (like the mul and mach are doing), and
3603 * adjust the high result and add them (like the mach is doing):
3605 * mul(8) g7<1>D g3<8,8,1>D g4.0<8,8,1>UW
3606 * mul(8) g8<1>D g3<8,8,1>D g4.1<8,8,1>UW
3607 * shl(8) g9<1>D g8<8,8,1>D 16D
3608 * add(8) g2<1>D g7<8,8,1>D g8<8,8,1>D
3610 * We avoid the shl instruction by realizing that we only want to add
3611 * the low 16-bits of the "high" result to the high 16-bits of the
3612 * "low" result and using proper regioning on the add:
3614 * mul(8) g7<1>D g3<8,8,1>D g4.0<16,8,2>UW
3615 * mul(8) g8<1>D g3<8,8,1>D g4.1<16,8,2>UW
3616 * add(8) g7.1<2>UW g7.1<16,8,2>UW g8<16,8,2>UW
3618 * Since it does not use the (single) accumulator register, we can
3619 * schedule multi-component multiplications much better.
3622 bool needs_mov
= false;
3623 fs_reg orig_dst
= inst
->dst
;
3624 fs_reg low
= inst
->dst
;
3625 if (orig_dst
.is_null() || orig_dst
.file
== MRF
||
3626 regions_overlap(inst
->dst
, inst
->size_written
,
3627 inst
->src
[0], inst
->size_read(0)) ||
3628 regions_overlap(inst
->dst
, inst
->size_written
,
3629 inst
->src
[1], inst
->size_read(1))) {
3631 /* Get a new VGRF but keep the same stride as inst->dst */
3632 low
= fs_reg(VGRF
, alloc
.allocate(regs_written(inst
)),
3634 low
.stride
= inst
->dst
.stride
;
3635 low
.offset
= inst
->dst
.offset
% REG_SIZE
;
3638 /* Get a new VGRF but keep the same stride as inst->dst */
3639 fs_reg
high(VGRF
, alloc
.allocate(regs_written(inst
)),
3641 high
.stride
= inst
->dst
.stride
;
3642 high
.offset
= inst
->dst
.offset
% REG_SIZE
;
3644 if (devinfo
->gen
>= 7) {
3645 if (inst
->src
[1].file
== IMM
) {
3646 ibld
.MUL(low
, inst
->src
[0],
3647 brw_imm_uw(inst
->src
[1].ud
& 0xffff));
3648 ibld
.MUL(high
, inst
->src
[0],
3649 brw_imm_uw(inst
->src
[1].ud
>> 16));
3651 ibld
.MUL(low
, inst
->src
[0],
3652 subscript(inst
->src
[1], BRW_REGISTER_TYPE_UW
, 0));
3653 ibld
.MUL(high
, inst
->src
[0],
3654 subscript(inst
->src
[1], BRW_REGISTER_TYPE_UW
, 1));
3657 ibld
.MUL(low
, subscript(inst
->src
[0], BRW_REGISTER_TYPE_UW
, 0),
3659 ibld
.MUL(high
, subscript(inst
->src
[0], BRW_REGISTER_TYPE_UW
, 1),
3663 ibld
.ADD(subscript(low
, BRW_REGISTER_TYPE_UW
, 1),
3664 subscript(low
, BRW_REGISTER_TYPE_UW
, 1),
3665 subscript(high
, BRW_REGISTER_TYPE_UW
, 0));
3667 if (needs_mov
|| inst
->conditional_mod
) {
3668 set_condmod(inst
->conditional_mod
,
3669 ibld
.MOV(orig_dst
, low
));
3673 } else if (inst
->opcode
== SHADER_OPCODE_MULH
) {
3674 /* Should have been lowered to 8-wide. */
3675 assert(inst
->exec_size
<= get_lowered_simd_width(devinfo
, inst
));
3676 const fs_reg acc
= retype(brw_acc_reg(inst
->exec_size
),
3678 fs_inst
*mul
= ibld
.MUL(acc
, inst
->src
[0], inst
->src
[1]);
3679 fs_inst
*mach
= ibld
.MACH(inst
->dst
, inst
->src
[0], inst
->src
[1]);
3681 if (devinfo
->gen
>= 8) {
3682 /* Until Gen8, integer multiplies read 32-bits from one source,
3683 * and 16-bits from the other, and relying on the MACH instruction
3684 * to generate the high bits of the result.
3686 * On Gen8, the multiply instruction does a full 32x32-bit
3687 * multiply, but in order to do a 64-bit multiply we can simulate
3688 * the previous behavior and then use a MACH instruction.
3690 * FINISHME: Don't use source modifiers on src1.
3692 assert(mul
->src
[1].type
== BRW_REGISTER_TYPE_D
||
3693 mul
->src
[1].type
== BRW_REGISTER_TYPE_UD
);
3694 mul
->src
[1].type
= BRW_REGISTER_TYPE_UW
;
3695 mul
->src
[1].stride
*= 2;
3697 } else if (devinfo
->gen
== 7 && !devinfo
->is_haswell
&&
3699 /* Among other things the quarter control bits influence which
3700 * accumulator register is used by the hardware for instructions
3701 * that access the accumulator implicitly (e.g. MACH). A
3702 * second-half instruction would normally map to acc1, which
3703 * doesn't exist on Gen7 and up (the hardware does emulate it for
3704 * floating-point instructions *only* by taking advantage of the
3705 * extra precision of acc0 not normally used for floating point
3708 * HSW and up are careful enough not to try to access an
3709 * accumulator register that doesn't exist, but on earlier Gen7
3710 * hardware we need to make sure that the quarter control bits are
3711 * zero to avoid non-deterministic behaviour and emit an extra MOV
3712 * to get the result masked correctly according to the current
3716 mach
->force_writemask_all
= true;
3717 mach
->dst
= ibld
.vgrf(inst
->dst
.type
);
3718 ibld
.MOV(inst
->dst
, mach
->dst
);
3724 inst
->remove(block
);
3729 invalidate_live_intervals();
3735 fs_visitor::lower_minmax()
3737 assert(devinfo
->gen
< 6);
3739 bool progress
= false;
3741 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3742 const fs_builder
ibld(this, block
, inst
);
3744 if (inst
->opcode
== BRW_OPCODE_SEL
&&
3745 inst
->predicate
== BRW_PREDICATE_NONE
) {
3746 /* FIXME: Using CMP doesn't preserve the NaN propagation semantics of
3747 * the original SEL.L/GE instruction
3749 ibld
.CMP(ibld
.null_reg_d(), inst
->src
[0], inst
->src
[1],
3750 inst
->conditional_mod
);
3751 inst
->predicate
= BRW_PREDICATE_NORMAL
;
3752 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
3759 invalidate_live_intervals();
3765 setup_color_payload(const fs_builder
&bld
, const brw_wm_prog_key
*key
,
3766 fs_reg
*dst
, fs_reg color
, unsigned components
)
3768 if (key
->clamp_fragment_color
) {
3769 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 4);
3770 assert(color
.type
== BRW_REGISTER_TYPE_F
);
3772 for (unsigned i
= 0; i
< components
; i
++)
3774 bld
.MOV(offset(tmp
, bld
, i
), offset(color
, bld
, i
)));
3779 for (unsigned i
= 0; i
< components
; i
++)
3780 dst
[i
] = offset(color
, bld
, i
);
3784 lower_fb_write_logical_send(const fs_builder
&bld
, fs_inst
*inst
,
3785 const struct brw_wm_prog_data
*prog_data
,
3786 const brw_wm_prog_key
*key
,
3787 const fs_visitor::thread_payload
&payload
)
3789 assert(inst
->src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].file
== IMM
);
3790 const gen_device_info
*devinfo
= bld
.shader
->devinfo
;
3791 const fs_reg
&color0
= inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR0
];
3792 const fs_reg
&color1
= inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR1
];
3793 const fs_reg
&src0_alpha
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC0_ALPHA
];
3794 const fs_reg
&src_depth
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_DEPTH
];
3795 const fs_reg
&dst_depth
= inst
->src
[FB_WRITE_LOGICAL_SRC_DST_DEPTH
];
3796 const fs_reg
&src_stencil
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_STENCIL
];
3797 fs_reg sample_mask
= inst
->src
[FB_WRITE_LOGICAL_SRC_OMASK
];
3798 const unsigned components
=
3799 inst
->src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].ud
;
3801 /* We can potentially have a message length of up to 15, so we have to set
3802 * base_mrf to either 0 or 1 in order to fit in m0..m15.
3805 int header_size
= 2, payload_header_size
;
3806 unsigned length
= 0;
3808 /* From the Sandy Bridge PRM, volume 4, page 198:
3810 * "Dispatched Pixel Enables. One bit per pixel indicating
3811 * which pixels were originally enabled when the thread was
3812 * dispatched. This field is only required for the end-of-
3813 * thread message and on all dual-source messages."
3815 if (devinfo
->gen
>= 6 &&
3816 (devinfo
->is_haswell
|| devinfo
->gen
>= 8 || !prog_data
->uses_kill
) &&
3817 color1
.file
== BAD_FILE
&&
3818 key
->nr_color_regions
== 1) {
3822 if (header_size
!= 0) {
3823 assert(header_size
== 2);
3824 /* Allocate 2 registers for a header */
3828 if (payload
.aa_dest_stencil_reg
) {
3829 sources
[length
] = fs_reg(VGRF
, bld
.shader
->alloc
.allocate(1));
3830 bld
.group(8, 0).exec_all().annotate("FB write stencil/AA alpha")
3831 .MOV(sources
[length
],
3832 fs_reg(brw_vec8_grf(payload
.aa_dest_stencil_reg
, 0)));
3836 if (sample_mask
.file
!= BAD_FILE
) {
3837 sources
[length
] = fs_reg(VGRF
, bld
.shader
->alloc
.allocate(1),
3838 BRW_REGISTER_TYPE_UD
);
3840 /* Hand over gl_SampleMask. Only the lower 16 bits of each channel are
3841 * relevant. Since it's unsigned single words one vgrf is always
3842 * 16-wide, but only the lower or higher 8 channels will be used by the
3843 * hardware when doing a SIMD8 write depending on whether we have
3844 * selected the subspans for the first or second half respectively.
3846 assert(sample_mask
.file
!= BAD_FILE
&& type_sz(sample_mask
.type
) == 4);
3847 sample_mask
.type
= BRW_REGISTER_TYPE_UW
;
3848 sample_mask
.stride
*= 2;
3850 bld
.exec_all().annotate("FB write oMask")
3851 .MOV(horiz_offset(retype(sources
[length
], BRW_REGISTER_TYPE_UW
),
3857 payload_header_size
= length
;
3859 if (src0_alpha
.file
!= BAD_FILE
) {
3860 /* FIXME: This is being passed at the wrong location in the payload and
3861 * doesn't work when gl_SampleMask and MRTs are used simultaneously.
3862 * It's supposed to be immediately before oMask but there seems to be no
3863 * reasonable way to pass them in the correct order because LOAD_PAYLOAD
3864 * requires header sources to form a contiguous segment at the beginning
3865 * of the message and src0_alpha has per-channel semantics.
3867 setup_color_payload(bld
, key
, &sources
[length
], src0_alpha
, 1);
3869 } else if (key
->replicate_alpha
&& inst
->target
!= 0) {
3870 /* Handle the case when fragment shader doesn't write to draw buffer
3871 * zero. No need to call setup_color_payload() for src0_alpha because
3872 * alpha value will be undefined.
3877 setup_color_payload(bld
, key
, &sources
[length
], color0
, components
);
3880 if (color1
.file
!= BAD_FILE
) {
3881 setup_color_payload(bld
, key
, &sources
[length
], color1
, components
);
3885 if (src_depth
.file
!= BAD_FILE
) {
3886 sources
[length
] = src_depth
;
3890 if (dst_depth
.file
!= BAD_FILE
) {
3891 sources
[length
] = dst_depth
;
3895 if (src_stencil
.file
!= BAD_FILE
) {
3896 assert(devinfo
->gen
>= 9);
3897 assert(bld
.dispatch_width() != 16);
3899 /* XXX: src_stencil is only available on gen9+. dst_depth is never
3900 * available on gen9+. As such it's impossible to have both enabled at the
3901 * same time and therefore length cannot overrun the array.
3903 assert(length
< 15);
3905 sources
[length
] = bld
.vgrf(BRW_REGISTER_TYPE_UD
);
3906 bld
.exec_all().annotate("FB write OS")
3907 .MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UB
),
3908 subscript(src_stencil
, BRW_REGISTER_TYPE_UB
, 0));
3913 if (devinfo
->gen
>= 7) {
3914 /* Send from the GRF */
3915 fs_reg payload
= fs_reg(VGRF
, -1, BRW_REGISTER_TYPE_F
);
3916 load
= bld
.LOAD_PAYLOAD(payload
, sources
, length
, payload_header_size
);
3917 payload
.nr
= bld
.shader
->alloc
.allocate(regs_written(load
));
3918 load
->dst
= payload
;
3920 inst
->src
[0] = payload
;
3921 inst
->resize_sources(1);
3923 /* Send from the MRF */
3924 load
= bld
.LOAD_PAYLOAD(fs_reg(MRF
, 1, BRW_REGISTER_TYPE_F
),
3925 sources
, length
, payload_header_size
);
3927 /* On pre-SNB, we have to interlace the color values. LOAD_PAYLOAD
3928 * will do this for us if we just give it a COMPR4 destination.
3930 if (devinfo
->gen
< 6 && bld
.dispatch_width() == 16)
3931 load
->dst
.nr
|= BRW_MRF_COMPR4
;
3933 inst
->resize_sources(0);
3937 inst
->opcode
= FS_OPCODE_FB_WRITE
;
3938 inst
->mlen
= regs_written(load
);
3939 inst
->header_size
= header_size
;
3943 lower_fb_read_logical_send(const fs_builder
&bld
, fs_inst
*inst
)
3945 const fs_builder
&ubld
= bld
.exec_all();
3946 const unsigned length
= 2;
3947 const fs_reg header
= ubld
.group(8, 0).vgrf(BRW_REGISTER_TYPE_UD
, length
);
3950 .MOV(header
, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD
));
3952 inst
->resize_sources(1);
3953 inst
->src
[0] = header
;
3954 inst
->opcode
= FS_OPCODE_FB_READ
;
3955 inst
->mlen
= length
;
3956 inst
->header_size
= length
;
3960 lower_sampler_logical_send_gen4(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3961 const fs_reg
&coordinate
,
3962 const fs_reg
&shadow_c
,
3963 const fs_reg
&lod
, const fs_reg
&lod2
,
3964 const fs_reg
&surface
,
3965 const fs_reg
&sampler
,
3966 unsigned coord_components
,
3967 unsigned grad_components
)
3969 const bool has_lod
= (op
== SHADER_OPCODE_TXL
|| op
== FS_OPCODE_TXB
||
3970 op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
);
3971 fs_reg
msg_begin(MRF
, 1, BRW_REGISTER_TYPE_F
);
3972 fs_reg msg_end
= msg_begin
;
3975 msg_end
= offset(msg_end
, bld
.group(8, 0), 1);
3977 for (unsigned i
= 0; i
< coord_components
; i
++)
3978 bld
.MOV(retype(offset(msg_end
, bld
, i
), coordinate
.type
),
3979 offset(coordinate
, bld
, i
));
3981 msg_end
= offset(msg_end
, bld
, coord_components
);
3983 /* Messages other than SAMPLE and RESINFO in SIMD16 and TXD in SIMD8
3984 * require all three components to be present and zero if they are unused.
3986 if (coord_components
> 0 &&
3987 (has_lod
|| shadow_c
.file
!= BAD_FILE
||
3988 (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8))) {
3989 for (unsigned i
= coord_components
; i
< 3; i
++)
3990 bld
.MOV(offset(msg_end
, bld
, i
), brw_imm_f(0.0f
));
3992 msg_end
= offset(msg_end
, bld
, 3 - coord_components
);
3995 if (op
== SHADER_OPCODE_TXD
) {
3996 /* TXD unsupported in SIMD16 mode. */
3997 assert(bld
.dispatch_width() == 8);
3999 /* the slots for u and v are always present, but r is optional */
4000 if (coord_components
< 2)
4001 msg_end
= offset(msg_end
, bld
, 2 - coord_components
);
4004 * dPdx = dudx, dvdx, drdx
4005 * dPdy = dudy, dvdy, drdy
4007 * 1-arg: Does not exist.
4009 * 2-arg: dudx dvdx dudy dvdy
4010 * dPdx.x dPdx.y dPdy.x dPdy.y
4013 * 3-arg: dudx dvdx drdx dudy dvdy drdy
4014 * dPdx.x dPdx.y dPdx.z dPdy.x dPdy.y dPdy.z
4015 * m5 m6 m7 m8 m9 m10
4017 for (unsigned i
= 0; i
< grad_components
; i
++)
4018 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod
, bld
, i
));
4020 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
4022 for (unsigned i
= 0; i
< grad_components
; i
++)
4023 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod2
, bld
, i
));
4025 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
4029 /* Bias/LOD with shadow comparator is unsupported in SIMD16 -- *Without*
4030 * shadow comparator (including RESINFO) it's unsupported in SIMD8 mode.
4032 assert(shadow_c
.file
!= BAD_FILE
? bld
.dispatch_width() == 8 :
4033 bld
.dispatch_width() == 16);
4035 const brw_reg_type type
=
4036 (op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
?
4037 BRW_REGISTER_TYPE_UD
: BRW_REGISTER_TYPE_F
);
4038 bld
.MOV(retype(msg_end
, type
), lod
);
4039 msg_end
= offset(msg_end
, bld
, 1);
4042 if (shadow_c
.file
!= BAD_FILE
) {
4043 if (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8) {
4044 /* There's no plain shadow compare message, so we use shadow
4045 * compare with a bias of 0.0.
4047 bld
.MOV(msg_end
, brw_imm_f(0.0f
));
4048 msg_end
= offset(msg_end
, bld
, 1);
4051 bld
.MOV(msg_end
, shadow_c
);
4052 msg_end
= offset(msg_end
, bld
, 1);
4056 inst
->src
[0] = reg_undef
;
4057 inst
->src
[1] = surface
;
4058 inst
->src
[2] = sampler
;
4059 inst
->resize_sources(3);
4060 inst
->base_mrf
= msg_begin
.nr
;
4061 inst
->mlen
= msg_end
.nr
- msg_begin
.nr
;
4062 inst
->header_size
= 1;
4066 lower_sampler_logical_send_gen5(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
4067 const fs_reg
&coordinate
,
4068 const fs_reg
&shadow_c
,
4069 const fs_reg
&lod
, const fs_reg
&lod2
,
4070 const fs_reg
&sample_index
,
4071 const fs_reg
&surface
,
4072 const fs_reg
&sampler
,
4073 unsigned coord_components
,
4074 unsigned grad_components
)
4076 fs_reg
message(MRF
, 2, BRW_REGISTER_TYPE_F
);
4077 fs_reg msg_coords
= message
;
4078 unsigned header_size
= 0;
4080 if (inst
->offset
!= 0) {
4081 /* The offsets set up by the visitor are in the m1 header, so we can't
4088 for (unsigned i
= 0; i
< coord_components
; i
++)
4089 bld
.MOV(retype(offset(msg_coords
, bld
, i
), coordinate
.type
),
4090 offset(coordinate
, bld
, i
));
4092 fs_reg msg_end
= offset(msg_coords
, bld
, coord_components
);
4093 fs_reg msg_lod
= offset(msg_coords
, bld
, 4);
4095 if (shadow_c
.file
!= BAD_FILE
) {
4096 fs_reg msg_shadow
= msg_lod
;
4097 bld
.MOV(msg_shadow
, shadow_c
);
4098 msg_lod
= offset(msg_shadow
, bld
, 1);
4103 case SHADER_OPCODE_TXL
:
4105 bld
.MOV(msg_lod
, lod
);
4106 msg_end
= offset(msg_lod
, bld
, 1);
4108 case SHADER_OPCODE_TXD
:
4111 * dPdx = dudx, dvdx, drdx
4112 * dPdy = dudy, dvdy, drdy
4114 * Load up these values:
4115 * - dudx dudy dvdx dvdy drdx drdy
4116 * - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z
4119 for (unsigned i
= 0; i
< grad_components
; i
++) {
4120 bld
.MOV(msg_end
, offset(lod
, bld
, i
));
4121 msg_end
= offset(msg_end
, bld
, 1);
4123 bld
.MOV(msg_end
, offset(lod2
, bld
, i
));
4124 msg_end
= offset(msg_end
, bld
, 1);
4127 case SHADER_OPCODE_TXS
:
4128 msg_lod
= retype(msg_end
, BRW_REGISTER_TYPE_UD
);
4129 bld
.MOV(msg_lod
, lod
);
4130 msg_end
= offset(msg_lod
, bld
, 1);
4132 case SHADER_OPCODE_TXF
:
4133 msg_lod
= offset(msg_coords
, bld
, 3);
4134 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), lod
);
4135 msg_end
= offset(msg_lod
, bld
, 1);
4137 case SHADER_OPCODE_TXF_CMS
:
4138 msg_lod
= offset(msg_coords
, bld
, 3);
4140 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), brw_imm_ud(0u));
4142 bld
.MOV(retype(offset(msg_lod
, bld
, 1), BRW_REGISTER_TYPE_UD
), sample_index
);
4143 msg_end
= offset(msg_lod
, bld
, 2);
4150 inst
->src
[0] = reg_undef
;
4151 inst
->src
[1] = surface
;
4152 inst
->src
[2] = sampler
;
4153 inst
->resize_sources(3);
4154 inst
->base_mrf
= message
.nr
;
4155 inst
->mlen
= msg_end
.nr
- message
.nr
;
4156 inst
->header_size
= header_size
;
4158 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
4159 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
4163 is_high_sampler(const struct gen_device_info
*devinfo
, const fs_reg
&sampler
)
4165 if (devinfo
->gen
< 8 && !devinfo
->is_haswell
)
4168 return sampler
.file
!= IMM
|| sampler
.ud
>= 16;
4172 lower_sampler_logical_send_gen7(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
4173 const fs_reg
&coordinate
,
4174 const fs_reg
&shadow_c
,
4175 fs_reg lod
, const fs_reg
&lod2
,
4176 const fs_reg
&sample_index
,
4178 const fs_reg
&surface
,
4179 const fs_reg
&sampler
,
4180 const fs_reg
&tg4_offset
,
4181 unsigned coord_components
,
4182 unsigned grad_components
)
4184 const gen_device_info
*devinfo
= bld
.shader
->devinfo
;
4185 unsigned reg_width
= bld
.dispatch_width() / 8;
4186 unsigned header_size
= 0, length
= 0;
4187 fs_reg sources
[MAX_SAMPLER_MESSAGE_SIZE
];
4188 for (unsigned i
= 0; i
< ARRAY_SIZE(sources
); i
++)
4189 sources
[i
] = bld
.vgrf(BRW_REGISTER_TYPE_F
);
4191 if (op
== SHADER_OPCODE_TG4
|| op
== SHADER_OPCODE_TG4_OFFSET
||
4192 inst
->offset
!= 0 || inst
->eot
||
4193 op
== SHADER_OPCODE_SAMPLEINFO
||
4194 is_high_sampler(devinfo
, sampler
)) {
4195 /* For general texture offsets (no txf workaround), we need a header to
4198 * TG4 needs to place its channel select in the header, for interaction
4199 * with ARB_texture_swizzle. The sampler index is only 4-bits, so for
4200 * larger sampler numbers we need to offset the Sampler State Pointer in
4203 fs_reg header
= retype(sources
[0], BRW_REGISTER_TYPE_UD
);
4207 /* If we're requesting fewer than four channels worth of response,
4208 * and we have an explicit header, we need to set up the sampler
4209 * writemask. It's reversed from normal: 1 means "don't write".
4211 if (!inst
->eot
&& regs_written(inst
) != 4 * reg_width
) {
4212 assert(regs_written(inst
) % reg_width
== 0);
4213 unsigned mask
= ~((1 << (regs_written(inst
) / reg_width
)) - 1) & 0xf;
4214 inst
->offset
|= mask
<< 12;
4217 /* Build the actual header */
4218 const fs_builder ubld
= bld
.exec_all().group(8, 0);
4219 const fs_builder ubld1
= ubld
.group(1, 0);
4220 ubld
.MOV(header
, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD
));
4222 ubld1
.MOV(component(header
, 2), brw_imm_ud(inst
->offset
));
4223 } else if (bld
.shader
->stage
!= MESA_SHADER_VERTEX
&&
4224 bld
.shader
->stage
!= MESA_SHADER_FRAGMENT
) {
4225 /* The vertex and fragment stages have g0.2 set to 0, so
4226 * header0.2 is 0 when g0 is copied. Other stages may not, so we
4227 * must set it to 0 to avoid setting undesirable bits in the
4230 ubld1
.MOV(component(header
, 2), brw_imm_ud(0));
4233 if (is_high_sampler(devinfo
, sampler
)) {
4234 if (sampler
.file
== BRW_IMMEDIATE_VALUE
) {
4235 assert(sampler
.ud
>= 16);
4236 const int sampler_state_size
= 16; /* 16 bytes */
4238 ubld1
.ADD(component(header
, 3),
4239 retype(brw_vec1_grf(0, 3), BRW_REGISTER_TYPE_UD
),
4240 brw_imm_ud(16 * (sampler
.ud
/ 16) * sampler_state_size
));
4242 fs_reg tmp
= ubld1
.vgrf(BRW_REGISTER_TYPE_UD
);
4243 ubld1
.AND(tmp
, sampler
, brw_imm_ud(0x0f0));
4244 ubld1
.SHL(tmp
, tmp
, brw_imm_ud(4));
4245 ubld1
.ADD(component(header
, 3),
4246 retype(brw_vec1_grf(0, 3), BRW_REGISTER_TYPE_UD
),
4252 if (shadow_c
.file
!= BAD_FILE
) {
4253 bld
.MOV(sources
[length
], shadow_c
);
4257 bool coordinate_done
= false;
4259 /* Set up the LOD info */
4262 case SHADER_OPCODE_TXL
:
4263 if (devinfo
->gen
>= 9 && op
== SHADER_OPCODE_TXL
&& lod
.is_zero()) {
4264 op
= SHADER_OPCODE_TXL_LZ
;
4267 bld
.MOV(sources
[length
], lod
);
4270 case SHADER_OPCODE_TXD
:
4271 /* TXD should have been lowered in SIMD16 mode. */
4272 assert(bld
.dispatch_width() == 8);
4274 /* Load dPdx and the coordinate together:
4275 * [hdr], [ref], x, dPdx.x, dPdy.x, y, dPdx.y, dPdy.y, z, dPdx.z, dPdy.z
4277 for (unsigned i
= 0; i
< coord_components
; i
++) {
4278 bld
.MOV(sources
[length
++], offset(coordinate
, bld
, i
));
4280 /* For cube map array, the coordinate is (u,v,r,ai) but there are
4281 * only derivatives for (u, v, r).
4283 if (i
< grad_components
) {
4284 bld
.MOV(sources
[length
++], offset(lod
, bld
, i
));
4285 bld
.MOV(sources
[length
++], offset(lod2
, bld
, i
));
4289 coordinate_done
= true;
4291 case SHADER_OPCODE_TXS
:
4292 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), lod
);
4295 case SHADER_OPCODE_TXF
:
4296 /* Unfortunately, the parameters for LD are intermixed: u, lod, v, r.
4297 * On Gen9 they are u, v, lod, r
4299 bld
.MOV(retype(sources
[length
++], BRW_REGISTER_TYPE_D
), coordinate
);
4301 if (devinfo
->gen
>= 9) {
4302 if (coord_components
>= 2) {
4303 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
),
4304 offset(coordinate
, bld
, 1));
4306 sources
[length
] = brw_imm_d(0);
4311 if (devinfo
->gen
>= 9 && lod
.is_zero()) {
4312 op
= SHADER_OPCODE_TXF_LZ
;
4314 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), lod
);
4318 for (unsigned i
= devinfo
->gen
>= 9 ? 2 : 1; i
< coord_components
; i
++)
4319 bld
.MOV(retype(sources
[length
++], BRW_REGISTER_TYPE_D
),
4320 offset(coordinate
, bld
, i
));
4322 coordinate_done
= true;
4325 case SHADER_OPCODE_TXF_CMS
:
4326 case SHADER_OPCODE_TXF_CMS_W
:
4327 case SHADER_OPCODE_TXF_UMS
:
4328 case SHADER_OPCODE_TXF_MCS
:
4329 if (op
== SHADER_OPCODE_TXF_UMS
||
4330 op
== SHADER_OPCODE_TXF_CMS
||
4331 op
== SHADER_OPCODE_TXF_CMS_W
) {
4332 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), sample_index
);
4336 if (op
== SHADER_OPCODE_TXF_CMS
|| op
== SHADER_OPCODE_TXF_CMS_W
) {
4337 /* Data from the multisample control surface. */
4338 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), mcs
);
4341 /* On Gen9+ we'll use ld2dms_w instead which has two registers for
4344 if (op
== SHADER_OPCODE_TXF_CMS_W
) {
4345 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
),
4348 offset(mcs
, bld
, 1));
4353 /* There is no offsetting for this message; just copy in the integer
4354 * texture coordinates.
4356 for (unsigned i
= 0; i
< coord_components
; i
++)
4357 bld
.MOV(retype(sources
[length
++], BRW_REGISTER_TYPE_D
),
4358 offset(coordinate
, bld
, i
));
4360 coordinate_done
= true;
4362 case SHADER_OPCODE_TG4_OFFSET
:
4363 /* More crazy intermixing */
4364 for (unsigned i
= 0; i
< 2; i
++) /* u, v */
4365 bld
.MOV(sources
[length
++], offset(coordinate
, bld
, i
));
4367 for (unsigned i
= 0; i
< 2; i
++) /* offu, offv */
4368 bld
.MOV(retype(sources
[length
++], BRW_REGISTER_TYPE_D
),
4369 offset(tg4_offset
, bld
, i
));
4371 if (coord_components
== 3) /* r if present */
4372 bld
.MOV(sources
[length
++], offset(coordinate
, bld
, 2));
4374 coordinate_done
= true;
4380 /* Set up the coordinate (except for cases where it was done above) */
4381 if (!coordinate_done
) {
4382 for (unsigned i
= 0; i
< coord_components
; i
++)
4383 bld
.MOV(sources
[length
++], offset(coordinate
, bld
, i
));
4388 mlen
= length
* reg_width
- header_size
;
4390 mlen
= length
* reg_width
;
4392 const fs_reg src_payload
= fs_reg(VGRF
, bld
.shader
->alloc
.allocate(mlen
),
4393 BRW_REGISTER_TYPE_F
);
4394 bld
.LOAD_PAYLOAD(src_payload
, sources
, length
, header_size
);
4396 /* Generate the SEND. */
4398 inst
->src
[0] = src_payload
;
4399 inst
->src
[1] = surface
;
4400 inst
->src
[2] = sampler
;
4401 inst
->resize_sources(3);
4403 inst
->header_size
= header_size
;
4405 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
4406 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
4410 lower_sampler_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
)
4412 const gen_device_info
*devinfo
= bld
.shader
->devinfo
;
4413 const fs_reg
&coordinate
= inst
->src
[TEX_LOGICAL_SRC_COORDINATE
];
4414 const fs_reg
&shadow_c
= inst
->src
[TEX_LOGICAL_SRC_SHADOW_C
];
4415 const fs_reg
&lod
= inst
->src
[TEX_LOGICAL_SRC_LOD
];
4416 const fs_reg
&lod2
= inst
->src
[TEX_LOGICAL_SRC_LOD2
];
4417 const fs_reg
&sample_index
= inst
->src
[TEX_LOGICAL_SRC_SAMPLE_INDEX
];
4418 const fs_reg
&mcs
= inst
->src
[TEX_LOGICAL_SRC_MCS
];
4419 const fs_reg
&surface
= inst
->src
[TEX_LOGICAL_SRC_SURFACE
];
4420 const fs_reg
&sampler
= inst
->src
[TEX_LOGICAL_SRC_SAMPLER
];
4421 const fs_reg
&tg4_offset
= inst
->src
[TEX_LOGICAL_SRC_TG4_OFFSET
];
4422 assert(inst
->src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].file
== IMM
);
4423 const unsigned coord_components
= inst
->src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].ud
;
4424 assert(inst
->src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].file
== IMM
);
4425 const unsigned grad_components
= inst
->src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].ud
;
4427 if (devinfo
->gen
>= 7) {
4428 lower_sampler_logical_send_gen7(bld
, inst
, op
, coordinate
,
4429 shadow_c
, lod
, lod2
, sample_index
,
4430 mcs
, surface
, sampler
, tg4_offset
,
4431 coord_components
, grad_components
);
4432 } else if (devinfo
->gen
>= 5) {
4433 lower_sampler_logical_send_gen5(bld
, inst
, op
, coordinate
,
4434 shadow_c
, lod
, lod2
, sample_index
,
4436 coord_components
, grad_components
);
4438 lower_sampler_logical_send_gen4(bld
, inst
, op
, coordinate
,
4439 shadow_c
, lod
, lod2
,
4441 coord_components
, grad_components
);
4446 * Initialize the header present in some typed and untyped surface
4450 emit_surface_header(const fs_builder
&bld
, const fs_reg
&sample_mask
)
4452 fs_builder ubld
= bld
.exec_all().group(8, 0);
4453 const fs_reg dst
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
4454 ubld
.MOV(dst
, brw_imm_d(0));
4455 ubld
.group(1, 0).MOV(component(dst
, 7), sample_mask
);
4460 lower_surface_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
4461 const fs_reg
&sample_mask
)
4463 /* Get the logical send arguments. */
4464 const fs_reg
&addr
= inst
->src
[0];
4465 const fs_reg
&src
= inst
->src
[1];
4466 const fs_reg
&surface
= inst
->src
[2];
4467 const UNUSED fs_reg
&dims
= inst
->src
[3];
4468 const fs_reg
&arg
= inst
->src
[4];
4470 /* Calculate the total number of components of the payload. */
4471 const unsigned addr_sz
= inst
->components_read(0);
4472 const unsigned src_sz
= inst
->components_read(1);
4473 const unsigned header_sz
= (sample_mask
.file
== BAD_FILE
? 0 : 1);
4474 const unsigned sz
= header_sz
+ addr_sz
+ src_sz
;
4476 /* Allocate space for the payload. */
4477 fs_reg
*const components
= new fs_reg
[sz
];
4478 const fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, sz
);
4481 /* Construct the payload. */
4483 components
[n
++] = emit_surface_header(bld
, sample_mask
);
4485 for (unsigned i
= 0; i
< addr_sz
; i
++)
4486 components
[n
++] = offset(addr
, bld
, i
);
4488 for (unsigned i
= 0; i
< src_sz
; i
++)
4489 components
[n
++] = offset(src
, bld
, i
);
4491 bld
.LOAD_PAYLOAD(payload
, components
, sz
, header_sz
);
4493 /* Update the original instruction. */
4495 inst
->mlen
= header_sz
+ (addr_sz
+ src_sz
) * inst
->exec_size
/ 8;
4496 inst
->header_size
= header_sz
;
4498 inst
->src
[0] = payload
;
4499 inst
->src
[1] = surface
;
4501 inst
->resize_sources(3);
4503 delete[] components
;
4507 lower_varying_pull_constant_logical_send(const fs_builder
&bld
, fs_inst
*inst
)
4509 const gen_device_info
*devinfo
= bld
.shader
->devinfo
;
4511 if (devinfo
->gen
>= 7) {
4512 /* We are switching the instruction from an ALU-like instruction to a
4513 * send-from-grf instruction. Since sends can't handle strides or
4514 * source modifiers, we have to make a copy of the offset source.
4516 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
4517 bld
.MOV(tmp
, inst
->src
[1]);
4520 inst
->opcode
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
;
4523 const fs_reg
payload(MRF
, FIRST_PULL_LOAD_MRF(devinfo
->gen
),
4524 BRW_REGISTER_TYPE_UD
);
4526 bld
.MOV(byte_offset(payload
, REG_SIZE
), inst
->src
[1]);
4528 inst
->opcode
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN4
;
4529 inst
->resize_sources(1);
4530 inst
->base_mrf
= payload
.nr
;
4531 inst
->header_size
= 1;
4532 inst
->mlen
= 1 + inst
->exec_size
/ 8;
4537 lower_math_logical_send(const fs_builder
&bld
, fs_inst
*inst
)
4539 assert(bld
.shader
->devinfo
->gen
< 6);
4542 inst
->mlen
= inst
->sources
* inst
->exec_size
/ 8;
4544 if (inst
->sources
> 1) {
4545 /* From the Ironlake PRM, Volume 4, Part 1, Section 6.1.13
4546 * "Message Payload":
4548 * "Operand0[7]. For the INT DIV functions, this operand is the
4551 * "Operand1[7]. For the INT DIV functions, this operand is the
4554 const bool is_int_div
= inst
->opcode
!= SHADER_OPCODE_POW
;
4555 const fs_reg src0
= is_int_div
? inst
->src
[1] : inst
->src
[0];
4556 const fs_reg src1
= is_int_div
? inst
->src
[0] : inst
->src
[1];
4558 inst
->resize_sources(1);
4559 inst
->src
[0] = src0
;
4561 assert(inst
->exec_size
== 8);
4562 bld
.MOV(fs_reg(MRF
, inst
->base_mrf
+ 1, src1
.type
), src1
);
4567 fs_visitor::lower_logical_sends()
4569 bool progress
= false;
4571 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
4572 const fs_builder
ibld(this, block
, inst
);
4574 switch (inst
->opcode
) {
4575 case FS_OPCODE_FB_WRITE_LOGICAL
:
4576 assert(stage
== MESA_SHADER_FRAGMENT
);
4577 lower_fb_write_logical_send(ibld
, inst
,
4578 brw_wm_prog_data(prog_data
),
4579 (const brw_wm_prog_key
*)key
,
4583 case FS_OPCODE_FB_READ_LOGICAL
:
4584 lower_fb_read_logical_send(ibld
, inst
);
4587 case SHADER_OPCODE_TEX_LOGICAL
:
4588 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TEX
);
4591 case SHADER_OPCODE_TXD_LOGICAL
:
4592 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXD
);
4595 case SHADER_OPCODE_TXF_LOGICAL
:
4596 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF
);
4599 case SHADER_OPCODE_TXL_LOGICAL
:
4600 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXL
);
4603 case SHADER_OPCODE_TXS_LOGICAL
:
4604 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXS
);
4607 case FS_OPCODE_TXB_LOGICAL
:
4608 lower_sampler_logical_send(ibld
, inst
, FS_OPCODE_TXB
);
4611 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
4612 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_CMS
);
4615 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
4616 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_CMS_W
);
4619 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
4620 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_UMS
);
4623 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
4624 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_MCS
);
4627 case SHADER_OPCODE_LOD_LOGICAL
:
4628 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_LOD
);
4631 case SHADER_OPCODE_TG4_LOGICAL
:
4632 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4
);
4635 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
4636 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4_OFFSET
);
4639 case SHADER_OPCODE_SAMPLEINFO_LOGICAL
:
4640 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_SAMPLEINFO
);
4643 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
4644 lower_surface_logical_send(ibld
, inst
,
4645 SHADER_OPCODE_UNTYPED_SURFACE_READ
,
4649 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
4650 lower_surface_logical_send(ibld
, inst
,
4651 SHADER_OPCODE_UNTYPED_SURFACE_WRITE
,
4652 ibld
.sample_mask_reg());
4655 case SHADER_OPCODE_BYTE_SCATTERED_READ_LOGICAL
:
4656 lower_surface_logical_send(ibld
, inst
,
4657 SHADER_OPCODE_BYTE_SCATTERED_READ
,
4661 case SHADER_OPCODE_BYTE_SCATTERED_WRITE_LOGICAL
:
4662 lower_surface_logical_send(ibld
, inst
,
4663 SHADER_OPCODE_BYTE_SCATTERED_WRITE
,
4664 ibld
.sample_mask_reg());
4667 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
4668 lower_surface_logical_send(ibld
, inst
,
4669 SHADER_OPCODE_UNTYPED_ATOMIC
,
4670 ibld
.sample_mask_reg());
4673 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
4674 lower_surface_logical_send(ibld
, inst
,
4675 SHADER_OPCODE_TYPED_SURFACE_READ
,
4679 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
4680 lower_surface_logical_send(ibld
, inst
,
4681 SHADER_OPCODE_TYPED_SURFACE_WRITE
,
4682 ibld
.sample_mask_reg());
4685 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
4686 lower_surface_logical_send(ibld
, inst
,
4687 SHADER_OPCODE_TYPED_ATOMIC
,
4688 ibld
.sample_mask_reg());
4691 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL
:
4692 lower_varying_pull_constant_logical_send(ibld
, inst
);
4695 case SHADER_OPCODE_RCP
:
4696 case SHADER_OPCODE_RSQ
:
4697 case SHADER_OPCODE_SQRT
:
4698 case SHADER_OPCODE_EXP2
:
4699 case SHADER_OPCODE_LOG2
:
4700 case SHADER_OPCODE_SIN
:
4701 case SHADER_OPCODE_COS
:
4702 case SHADER_OPCODE_POW
:
4703 case SHADER_OPCODE_INT_QUOTIENT
:
4704 case SHADER_OPCODE_INT_REMAINDER
:
4705 /* The math opcodes are overloaded for the send-like and
4706 * expression-like instructions which seems kind of icky. Gen6+ has
4707 * a native (but rather quirky) MATH instruction so we don't need to
4708 * do anything here. On Gen4-5 we'll have to lower the Gen6-like
4709 * logical instructions (which we can easily recognize because they
4710 * have mlen = 0) into send-like virtual instructions.
4712 if (devinfo
->gen
< 6 && inst
->mlen
== 0) {
4713 lower_math_logical_send(ibld
, inst
);
4728 invalidate_live_intervals();
4734 * Get the closest allowed SIMD width for instruction \p inst accounting for
4735 * some common regioning and execution control restrictions that apply to FPU
4736 * instructions. These restrictions don't necessarily have any relevance to
4737 * instructions not executed by the FPU pipeline like extended math, control
4738 * flow or send message instructions.
4740 * For virtual opcodes it's really up to the instruction -- In some cases
4741 * (e.g. where a virtual instruction unrolls into a simple sequence of FPU
4742 * instructions) it may simplify virtual instruction lowering if we can
4743 * enforce FPU-like regioning restrictions already on the virtual instruction,
4744 * in other cases (e.g. virtual send-like instructions) this may be
4745 * excessively restrictive.
4748 get_fpu_lowered_simd_width(const struct gen_device_info
*devinfo
,
4749 const fs_inst
*inst
)
4751 /* Maximum execution size representable in the instruction controls. */
4752 unsigned max_width
= MIN2(32, inst
->exec_size
);
4754 /* According to the PRMs:
4755 * "A. In Direct Addressing mode, a source cannot span more than 2
4756 * adjacent GRF registers.
4757 * B. A destination cannot span more than 2 adjacent GRF registers."
4759 * Look for the source or destination with the largest register region
4760 * which is the one that is going to limit the overall execution size of
4761 * the instruction due to this rule.
4763 unsigned reg_count
= DIV_ROUND_UP(inst
->size_written
, REG_SIZE
);
4765 for (unsigned i
= 0; i
< inst
->sources
; i
++)
4766 reg_count
= MAX2(reg_count
, DIV_ROUND_UP(inst
->size_read(i
), REG_SIZE
));
4768 /* Calculate the maximum execution size of the instruction based on the
4769 * factor by which it goes over the hardware limit of 2 GRFs.
4772 max_width
= MIN2(max_width
, inst
->exec_size
/ DIV_ROUND_UP(reg_count
, 2));
4774 /* According to the IVB PRMs:
4775 * "When destination spans two registers, the source MUST span two
4776 * registers. The exception to the above rule:
4778 * - When source is scalar, the source registers are not incremented.
4779 * - When source is packed integer Word and destination is packed
4780 * integer DWord, the source register is not incremented but the
4781 * source sub register is incremented."
4783 * The hardware specs from Gen4 to Gen7.5 mention similar regioning
4784 * restrictions. The code below intentionally doesn't check whether the
4785 * destination type is integer because empirically the hardware doesn't
4786 * seem to care what the actual type is as long as it's dword-aligned.
4788 if (devinfo
->gen
< 8) {
4789 for (unsigned i
= 0; i
< inst
->sources
; i
++) {
4790 /* IVB implements DF scalars as <0;2,1> regions. */
4791 const bool is_scalar_exception
= is_uniform(inst
->src
[i
]) &&
4792 (devinfo
->is_haswell
|| type_sz(inst
->src
[i
].type
) != 8);
4793 const bool is_packed_word_exception
=
4794 type_sz(inst
->dst
.type
) == 4 && inst
->dst
.stride
== 1 &&
4795 type_sz(inst
->src
[i
].type
) == 2 && inst
->src
[i
].stride
== 1;
4797 if (inst
->size_written
> REG_SIZE
&&
4798 inst
->size_read(i
) != 0 && inst
->size_read(i
) <= REG_SIZE
&&
4799 !is_scalar_exception
&& !is_packed_word_exception
) {
4800 const unsigned reg_count
= DIV_ROUND_UP(inst
->size_written
, REG_SIZE
);
4801 max_width
= MIN2(max_width
, inst
->exec_size
/ reg_count
);
4806 /* From the IVB PRMs:
4807 * "When an instruction is SIMD32, the low 16 bits of the execution mask
4808 * are applied for both halves of the SIMD32 instruction. If different
4809 * execution mask channels are required, split the instruction into two
4810 * SIMD16 instructions."
4812 * There is similar text in the HSW PRMs. Gen4-6 don't even implement
4813 * 32-wide control flow support in hardware and will behave similarly.
4815 if (devinfo
->gen
< 8 && !inst
->force_writemask_all
)
4816 max_width
= MIN2(max_width
, 16);
4818 /* From the IVB PRMs (applies to HSW too):
4819 * "Instructions with condition modifiers must not use SIMD32."
4821 * From the BDW PRMs (applies to later hardware too):
4822 * "Ternary instruction with condition modifiers must not use SIMD32."
4824 if (inst
->conditional_mod
&& (devinfo
->gen
< 8 || inst
->is_3src(devinfo
)))
4825 max_width
= MIN2(max_width
, 16);
4827 /* From the IVB PRMs (applies to other devices that don't have the
4828 * gen_device_info::supports_simd16_3src flag set):
4829 * "In Align16 access mode, SIMD16 is not allowed for DW operations and
4830 * SIMD8 is not allowed for DF operations."
4832 if (inst
->is_3src(devinfo
) && !devinfo
->supports_simd16_3src
)
4833 max_width
= MIN2(max_width
, inst
->exec_size
/ reg_count
);
4835 /* Pre-Gen8 EUs are hardwired to use the QtrCtrl+1 (where QtrCtrl is
4836 * the 8-bit quarter of the execution mask signals specified in the
4837 * instruction control fields) for the second compressed half of any
4838 * single-precision instruction (for double-precision instructions
4839 * it's hardwired to use NibCtrl+1, at least on HSW), which means that
4840 * the EU will apply the wrong execution controls for the second
4841 * sequential GRF write if the number of channels per GRF is not exactly
4842 * eight in single-precision mode (or four in double-float mode).
4844 * In this situation we calculate the maximum size of the split
4845 * instructions so they only ever write to a single register.
4847 if (devinfo
->gen
< 8 && inst
->size_written
> REG_SIZE
&&
4848 !inst
->force_writemask_all
) {
4849 const unsigned channels_per_grf
= inst
->exec_size
/
4850 DIV_ROUND_UP(inst
->size_written
, REG_SIZE
);
4851 const unsigned exec_type_size
= get_exec_type_size(inst
);
4852 assert(exec_type_size
);
4854 /* The hardware shifts exactly 8 channels per compressed half of the
4855 * instruction in single-precision mode and exactly 4 in double-precision.
4857 if (channels_per_grf
!= (exec_type_size
== 8 ? 4 : 8))
4858 max_width
= MIN2(max_width
, channels_per_grf
);
4860 /* Lower all non-force_writemask_all DF instructions to SIMD4 on IVB/BYT
4861 * because HW applies the same channel enable signals to both halves of
4862 * the compressed instruction which will be just wrong under
4863 * non-uniform control flow.
4865 if (devinfo
->gen
== 7 && !devinfo
->is_haswell
&&
4866 (exec_type_size
== 8 || type_sz(inst
->dst
.type
) == 8))
4867 max_width
= MIN2(max_width
, 4);
4870 /* Only power-of-two execution sizes are representable in the instruction
4873 return 1 << _mesa_logbase2(max_width
);
4877 * Get the maximum allowed SIMD width for instruction \p inst accounting for
4878 * various payload size restrictions that apply to sampler message
4881 * This is only intended to provide a maximum theoretical bound for the
4882 * execution size of the message based on the number of argument components
4883 * alone, which in most cases will determine whether the SIMD8 or SIMD16
4884 * variant of the message can be used, though some messages may have
4885 * additional restrictions not accounted for here (e.g. pre-ILK hardware uses
4886 * the message length to determine the exact SIMD width and argument count,
4887 * which makes a number of sampler message combinations impossible to
4891 get_sampler_lowered_simd_width(const struct gen_device_info
*devinfo
,
4892 const fs_inst
*inst
)
4894 /* Calculate the number of coordinate components that have to be present
4895 * assuming that additional arguments follow the texel coordinates in the
4896 * message payload. On IVB+ there is no need for padding, on ILK-SNB we
4897 * need to pad to four or three components depending on the message,
4898 * pre-ILK we need to pad to at most three components.
4900 const unsigned req_coord_components
=
4901 (devinfo
->gen
>= 7 ||
4902 !inst
->components_read(TEX_LOGICAL_SRC_COORDINATE
)) ? 0 :
4903 (devinfo
->gen
>= 5 && inst
->opcode
!= SHADER_OPCODE_TXF_LOGICAL
&&
4904 inst
->opcode
!= SHADER_OPCODE_TXF_CMS_LOGICAL
) ? 4 :
4907 /* On Gen9+ the LOD argument is for free if we're able to use the LZ
4908 * variant of the TXL or TXF message.
4910 const bool implicit_lod
= devinfo
->gen
>= 9 &&
4911 (inst
->opcode
== SHADER_OPCODE_TXL
||
4912 inst
->opcode
== SHADER_OPCODE_TXF
) &&
4913 inst
->src
[TEX_LOGICAL_SRC_LOD
].is_zero();
4915 /* Calculate the total number of argument components that need to be passed
4916 * to the sampler unit.
4918 const unsigned num_payload_components
=
4919 MAX2(inst
->components_read(TEX_LOGICAL_SRC_COORDINATE
),
4920 req_coord_components
) +
4921 inst
->components_read(TEX_LOGICAL_SRC_SHADOW_C
) +
4922 (implicit_lod
? 0 : inst
->components_read(TEX_LOGICAL_SRC_LOD
)) +
4923 inst
->components_read(TEX_LOGICAL_SRC_LOD2
) +
4924 inst
->components_read(TEX_LOGICAL_SRC_SAMPLE_INDEX
) +
4925 (inst
->opcode
== SHADER_OPCODE_TG4_OFFSET_LOGICAL
?
4926 inst
->components_read(TEX_LOGICAL_SRC_TG4_OFFSET
) : 0) +
4927 inst
->components_read(TEX_LOGICAL_SRC_MCS
);
4929 /* SIMD16 messages with more than five arguments exceed the maximum message
4930 * size supported by the sampler, regardless of whether a header is
4933 return MIN2(inst
->exec_size
,
4934 num_payload_components
> MAX_SAMPLER_MESSAGE_SIZE
/ 2 ? 8 : 16);
4938 * Get the closest native SIMD width supported by the hardware for instruction
4939 * \p inst. The instruction will be left untouched by
4940 * fs_visitor::lower_simd_width() if the returned value is equal to the
4941 * original execution size.
4944 get_lowered_simd_width(const struct gen_device_info
*devinfo
,
4945 const fs_inst
*inst
)
4947 switch (inst
->opcode
) {
4948 case BRW_OPCODE_MOV
:
4949 case BRW_OPCODE_SEL
:
4950 case BRW_OPCODE_NOT
:
4951 case BRW_OPCODE_AND
:
4953 case BRW_OPCODE_XOR
:
4954 case BRW_OPCODE_SHR
:
4955 case BRW_OPCODE_SHL
:
4956 case BRW_OPCODE_ASR
:
4957 case BRW_OPCODE_CMPN
:
4958 case BRW_OPCODE_CSEL
:
4959 case BRW_OPCODE_F32TO16
:
4960 case BRW_OPCODE_F16TO32
:
4961 case BRW_OPCODE_BFREV
:
4962 case BRW_OPCODE_BFE
:
4963 case BRW_OPCODE_ADD
:
4964 case BRW_OPCODE_MUL
:
4965 case BRW_OPCODE_AVG
:
4966 case BRW_OPCODE_FRC
:
4967 case BRW_OPCODE_RNDU
:
4968 case BRW_OPCODE_RNDD
:
4969 case BRW_OPCODE_RNDE
:
4970 case BRW_OPCODE_RNDZ
:
4971 case BRW_OPCODE_LZD
:
4972 case BRW_OPCODE_FBH
:
4973 case BRW_OPCODE_FBL
:
4974 case BRW_OPCODE_CBIT
:
4975 case BRW_OPCODE_SAD2
:
4976 case BRW_OPCODE_MAD
:
4977 case BRW_OPCODE_LRP
:
4978 case FS_OPCODE_PACK
:
4979 return get_fpu_lowered_simd_width(devinfo
, inst
);
4981 case BRW_OPCODE_CMP
: {
4982 /* The Ivybridge/BayTrail WaCMPInstFlagDepClearedEarly workaround says that
4983 * when the destination is a GRF the dependency-clear bit on the flag
4984 * register is cleared early.
4986 * Suggested workarounds are to disable coissuing CMP instructions
4987 * or to split CMP(16) instructions into two CMP(8) instructions.
4989 * We choose to split into CMP(8) instructions since disabling
4990 * coissuing would affect CMP instructions not otherwise affected by
4993 const unsigned max_width
= (devinfo
->gen
== 7 && !devinfo
->is_haswell
&&
4994 !inst
->dst
.is_null() ? 8 : ~0);
4995 return MIN2(max_width
, get_fpu_lowered_simd_width(devinfo
, inst
));
4997 case BRW_OPCODE_BFI1
:
4998 case BRW_OPCODE_BFI2
:
4999 /* The Haswell WaForceSIMD8ForBFIInstruction workaround says that we
5001 * "Force BFI instructions to be executed always in SIMD8."
5003 return MIN2(devinfo
->is_haswell
? 8 : ~0u,
5004 get_fpu_lowered_simd_width(devinfo
, inst
));
5007 assert(inst
->src
[0].file
== BAD_FILE
|| inst
->exec_size
<= 16);
5008 return inst
->exec_size
;
5010 case SHADER_OPCODE_RCP
:
5011 case SHADER_OPCODE_RSQ
:
5012 case SHADER_OPCODE_SQRT
:
5013 case SHADER_OPCODE_EXP2
:
5014 case SHADER_OPCODE_LOG2
:
5015 case SHADER_OPCODE_SIN
:
5016 case SHADER_OPCODE_COS
:
5017 /* Unary extended math instructions are limited to SIMD8 on Gen4 and
5020 return (devinfo
->gen
>= 7 ? MIN2(16, inst
->exec_size
) :
5021 devinfo
->gen
== 5 || devinfo
->is_g4x
? MIN2(16, inst
->exec_size
) :
5022 MIN2(8, inst
->exec_size
));
5024 case SHADER_OPCODE_POW
:
5025 /* SIMD16 is only allowed on Gen7+. */
5026 return (devinfo
->gen
>= 7 ? MIN2(16, inst
->exec_size
) :
5027 MIN2(8, inst
->exec_size
));
5029 case SHADER_OPCODE_INT_QUOTIENT
:
5030 case SHADER_OPCODE_INT_REMAINDER
:
5031 /* Integer division is limited to SIMD8 on all generations. */
5032 return MIN2(8, inst
->exec_size
);
5034 case FS_OPCODE_LINTERP
:
5035 case SHADER_OPCODE_GET_BUFFER_SIZE
:
5036 case FS_OPCODE_DDX_COARSE
:
5037 case FS_OPCODE_DDX_FINE
:
5038 case FS_OPCODE_DDY_COARSE
:
5039 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
5040 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
5041 case FS_OPCODE_PACK_HALF_2x16_SPLIT
:
5042 case FS_OPCODE_UNPACK_HALF_2x16_SPLIT_X
:
5043 case FS_OPCODE_UNPACK_HALF_2x16_SPLIT_Y
:
5044 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
5045 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
5046 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
5047 return MIN2(16, inst
->exec_size
);
5049 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL
:
5050 /* Pre-ILK hardware doesn't have a SIMD8 variant of the texel fetch
5051 * message used to implement varying pull constant loads, so expand it
5052 * to SIMD16. An alternative with longer message payload length but
5053 * shorter return payload would be to use the SIMD8 sampler message that
5054 * takes (header, u, v, r) as parameters instead of (header, u).
5056 return (devinfo
->gen
== 4 ? 16 : MIN2(16, inst
->exec_size
));
5058 case FS_OPCODE_DDY_FINE
:
5059 /* The implementation of this virtual opcode may require emitting
5060 * compressed Align16 instructions, which are severely limited on some
5063 * From the Ivy Bridge PRM, volume 4 part 3, section 3.3.9 (Register
5064 * Region Restrictions):
5066 * "In Align16 access mode, SIMD16 is not allowed for DW operations
5067 * and SIMD8 is not allowed for DF operations."
5069 * In this context, "DW operations" means "operations acting on 32-bit
5070 * values", so it includes operations on floats.
5072 * Gen4 has a similar restriction. From the i965 PRM, section 11.5.3
5073 * (Instruction Compression -> Rules and Restrictions):
5075 * "A compressed instruction must be in Align1 access mode. Align16
5076 * mode instructions cannot be compressed."
5078 * Similar text exists in the g45 PRM.
5080 * Empirically, compressed align16 instructions using odd register
5081 * numbers don't appear to work on Sandybridge either.
5083 return (devinfo
->gen
== 4 || devinfo
->gen
== 6 ||
5084 (devinfo
->gen
== 7 && !devinfo
->is_haswell
) ?
5085 MIN2(8, inst
->exec_size
) : MIN2(16, inst
->exec_size
));
5087 case SHADER_OPCODE_MULH
:
5088 /* MULH is lowered to the MUL/MACH sequence using the accumulator, which
5089 * is 8-wide on Gen7+.
5091 return (devinfo
->gen
>= 7 ? 8 :
5092 get_fpu_lowered_simd_width(devinfo
, inst
));
5094 case FS_OPCODE_FB_WRITE_LOGICAL
:
5095 /* Gen6 doesn't support SIMD16 depth writes but we cannot handle them
5098 assert(devinfo
->gen
!= 6 ||
5099 inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_DEPTH
].file
== BAD_FILE
||
5100 inst
->exec_size
== 8);
5101 /* Dual-source FB writes are unsupported in SIMD16 mode. */
5102 return (inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR1
].file
!= BAD_FILE
?
5103 8 : MIN2(16, inst
->exec_size
));
5105 case FS_OPCODE_FB_READ_LOGICAL
:
5106 return MIN2(16, inst
->exec_size
);
5108 case SHADER_OPCODE_TEX_LOGICAL
:
5109 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
5110 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
5111 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
5112 case SHADER_OPCODE_LOD_LOGICAL
:
5113 case SHADER_OPCODE_TG4_LOGICAL
:
5114 case SHADER_OPCODE_SAMPLEINFO_LOGICAL
:
5115 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
5116 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
5117 return get_sampler_lowered_simd_width(devinfo
, inst
);
5119 case SHADER_OPCODE_TXD_LOGICAL
:
5120 /* TXD is unsupported in SIMD16 mode. */
5123 case SHADER_OPCODE_TXL_LOGICAL
:
5124 case FS_OPCODE_TXB_LOGICAL
:
5125 /* Only one execution size is representable pre-ILK depending on whether
5126 * the shadow reference argument is present.
5128 if (devinfo
->gen
== 4)
5129 return inst
->src
[TEX_LOGICAL_SRC_SHADOW_C
].file
== BAD_FILE
? 16 : 8;
5131 return get_sampler_lowered_simd_width(devinfo
, inst
);
5133 case SHADER_OPCODE_TXF_LOGICAL
:
5134 case SHADER_OPCODE_TXS_LOGICAL
:
5135 /* Gen4 doesn't have SIMD8 variants for the RESINFO and LD-with-LOD
5136 * messages. Use SIMD16 instead.
5138 if (devinfo
->gen
== 4)
5141 return get_sampler_lowered_simd_width(devinfo
, inst
);
5143 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
5144 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
5145 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
5148 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
5149 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
5150 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
5151 case SHADER_OPCODE_BYTE_SCATTERED_WRITE_LOGICAL
:
5152 case SHADER_OPCODE_BYTE_SCATTERED_READ_LOGICAL
:
5153 return MIN2(16, inst
->exec_size
);
5155 case SHADER_OPCODE_URB_READ_SIMD8
:
5156 case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
:
5157 case SHADER_OPCODE_URB_WRITE_SIMD8
:
5158 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
5159 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
5160 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
5161 return MIN2(8, inst
->exec_size
);
5163 case SHADER_OPCODE_MOV_INDIRECT
: {
5164 /* From IVB and HSW PRMs:
5166 * "2.When the destination requires two registers and the sources are
5167 * indirect, the sources must use 1x1 regioning mode.
5169 * In case of DF instructions in HSW/IVB, the exec_size is limited by
5170 * the EU decompression logic not handling VxH indirect addressing
5173 const unsigned max_size
= (devinfo
->gen
>= 8 ? 2 : 1) * REG_SIZE
;
5174 /* Prior to Broadwell, we only have 8 address subregisters. */
5175 return MIN3(devinfo
->gen
>= 8 ? 16 : 8,
5176 max_size
/ (inst
->dst
.stride
* type_sz(inst
->dst
.type
)),
5180 case SHADER_OPCODE_LOAD_PAYLOAD
: {
5181 const unsigned reg_count
=
5182 DIV_ROUND_UP(inst
->dst
.component_size(inst
->exec_size
), REG_SIZE
);
5184 if (reg_count
> 2) {
5185 /* Only LOAD_PAYLOAD instructions with per-channel destination region
5186 * can be easily lowered (which excludes headers and heterogeneous
5189 assert(!inst
->header_size
);
5190 for (unsigned i
= 0; i
< inst
->sources
; i
++)
5191 assert(type_sz(inst
->dst
.type
) == type_sz(inst
->src
[i
].type
) ||
5192 inst
->src
[i
].file
== BAD_FILE
);
5194 return inst
->exec_size
/ DIV_ROUND_UP(reg_count
, 2);
5196 return inst
->exec_size
;
5200 return inst
->exec_size
;
5205 * Return true if splitting out the group of channels of instruction \p inst
5206 * given by lbld.group() requires allocating a temporary for the i-th source
5207 * of the lowered instruction.
5210 needs_src_copy(const fs_builder
&lbld
, const fs_inst
*inst
, unsigned i
)
5212 return !(is_periodic(inst
->src
[i
], lbld
.dispatch_width()) ||
5213 (inst
->components_read(i
) == 1 &&
5214 lbld
.dispatch_width() <= inst
->exec_size
)) ||
5215 (inst
->flags_written() &
5216 flag_mask(inst
->src
[i
], type_sz(inst
->src
[i
].type
)));
5220 * Extract the data that would be consumed by the channel group given by
5221 * lbld.group() from the i-th source region of instruction \p inst and return
5222 * it as result in packed form.
5225 emit_unzip(const fs_builder
&lbld
, fs_inst
*inst
, unsigned i
)
5227 /* Specified channel group from the source region. */
5228 const fs_reg src
= horiz_offset(inst
->src
[i
], lbld
.group());
5230 if (needs_src_copy(lbld
, inst
, i
)) {
5231 /* Builder of the right width to perform the copy avoiding uninitialized
5232 * data if the lowered execution size is greater than the original
5233 * execution size of the instruction.
5235 const fs_builder cbld
= lbld
.group(MIN2(lbld
.dispatch_width(),
5236 inst
->exec_size
), 0);
5237 const fs_reg tmp
= lbld
.vgrf(inst
->src
[i
].type
, inst
->components_read(i
));
5239 for (unsigned k
= 0; k
< inst
->components_read(i
); ++k
)
5240 cbld
.MOV(offset(tmp
, lbld
, k
), offset(src
, inst
->exec_size
, k
));
5244 } else if (is_periodic(inst
->src
[i
], lbld
.dispatch_width())) {
5245 /* The source is invariant for all dispatch_width-wide groups of the
5248 return inst
->src
[i
];
5251 /* We can just point the lowered instruction at the right channel group
5252 * from the original region.
5259 * Return true if splitting out the group of channels of instruction \p inst
5260 * given by lbld.group() requires allocating a temporary for the destination
5261 * of the lowered instruction and copying the data back to the original
5262 * destination region.
5265 needs_dst_copy(const fs_builder
&lbld
, const fs_inst
*inst
)
5267 /* If the instruction writes more than one component we'll have to shuffle
5268 * the results of multiple lowered instructions in order to make sure that
5269 * they end up arranged correctly in the original destination region.
5271 if (inst
->size_written
> inst
->dst
.component_size(inst
->exec_size
))
5274 /* If the lowered execution size is larger than the original the result of
5275 * the instruction won't fit in the original destination, so we'll have to
5276 * allocate a temporary in any case.
5278 if (lbld
.dispatch_width() > inst
->exec_size
)
5281 for (unsigned i
= 0; i
< inst
->sources
; i
++) {
5282 /* If we already made a copy of the source for other reasons there won't
5283 * be any overlap with the destination.
5285 if (needs_src_copy(lbld
, inst
, i
))
5288 /* In order to keep the logic simple we emit a copy whenever the
5289 * destination region doesn't exactly match an overlapping source, which
5290 * may point at the source and destination not being aligned group by
5291 * group which could cause one of the lowered instructions to overwrite
5292 * the data read from the same source by other lowered instructions.
5294 if (regions_overlap(inst
->dst
, inst
->size_written
,
5295 inst
->src
[i
], inst
->size_read(i
)) &&
5296 !inst
->dst
.equals(inst
->src
[i
]))
5304 * Insert data from a packed temporary into the channel group given by
5305 * lbld.group() of the destination region of instruction \p inst and return
5306 * the temporary as result. Any copy instructions that are required for
5307 * unzipping the previous value (in the case of partial writes) will be
5308 * inserted using \p lbld_before and any copy instructions required for
5309 * zipping up the destination of \p inst will be inserted using \p lbld_after.
5312 emit_zip(const fs_builder
&lbld_before
, const fs_builder
&lbld_after
,
5315 assert(lbld_before
.dispatch_width() == lbld_after
.dispatch_width());
5316 assert(lbld_before
.group() == lbld_after
.group());
5318 /* Specified channel group from the destination region. */
5319 const fs_reg dst
= horiz_offset(inst
->dst
, lbld_after
.group());
5320 const unsigned dst_size
= inst
->size_written
/
5321 inst
->dst
.component_size(inst
->exec_size
);
5323 if (needs_dst_copy(lbld_after
, inst
)) {
5324 const fs_reg tmp
= lbld_after
.vgrf(inst
->dst
.type
, dst_size
);
5326 if (inst
->predicate
) {
5327 /* Handle predication by copying the original contents of
5328 * the destination into the temporary before emitting the
5329 * lowered instruction.
5331 const fs_builder gbld_before
=
5332 lbld_before
.group(MIN2(lbld_before
.dispatch_width(),
5333 inst
->exec_size
), 0);
5334 for (unsigned k
= 0; k
< dst_size
; ++k
) {
5335 gbld_before
.MOV(offset(tmp
, lbld_before
, k
),
5336 offset(dst
, inst
->exec_size
, k
));
5340 const fs_builder gbld_after
=
5341 lbld_after
.group(MIN2(lbld_after
.dispatch_width(),
5342 inst
->exec_size
), 0);
5343 for (unsigned k
= 0; k
< dst_size
; ++k
) {
5344 /* Use a builder of the right width to perform the copy avoiding
5345 * uninitialized data if the lowered execution size is greater than
5346 * the original execution size of the instruction.
5348 gbld_after
.MOV(offset(dst
, inst
->exec_size
, k
),
5349 offset(tmp
, lbld_after
, k
));
5355 /* No need to allocate a temporary for the lowered instruction, just
5356 * take the right group of channels from the original region.
5363 fs_visitor::lower_simd_width()
5365 bool progress
= false;
5367 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
5368 const unsigned lower_width
= get_lowered_simd_width(devinfo
, inst
);
5370 if (lower_width
!= inst
->exec_size
) {
5371 /* Builder matching the original instruction. We may also need to
5372 * emit an instruction of width larger than the original, set the
5373 * execution size of the builder to the highest of both for now so
5374 * we're sure that both cases can be handled.
5376 const unsigned max_width
= MAX2(inst
->exec_size
, lower_width
);
5377 const fs_builder ibld
= bld
.at(block
, inst
)
5378 .exec_all(inst
->force_writemask_all
)
5379 .group(max_width
, inst
->group
/ max_width
);
5381 /* Split the copies in chunks of the execution width of either the
5382 * original or the lowered instruction, whichever is lower.
5384 const unsigned n
= DIV_ROUND_UP(inst
->exec_size
, lower_width
);
5385 const unsigned dst_size
= inst
->size_written
/
5386 inst
->dst
.component_size(inst
->exec_size
);
5388 assert(!inst
->writes_accumulator
&& !inst
->mlen
);
5390 /* Inserting the zip, unzip, and duplicated instructions in all of
5391 * the right spots is somewhat tricky. All of the unzip and any
5392 * instructions from the zip which unzip the destination prior to
5393 * writing need to happen before all of the per-group instructions
5394 * and the zip instructions need to happen after. In order to sort
5395 * this all out, we insert the unzip instructions before \p inst,
5396 * insert the per-group instructions after \p inst (i.e. before
5397 * inst->next), and insert the zip instructions before the
5398 * instruction after \p inst. Since we are inserting instructions
5399 * after \p inst, inst->next is a moving target and we need to save
5400 * it off here so that we insert the zip instructions in the right
5403 exec_node
*const after_inst
= inst
->next
;
5404 for (unsigned i
= 0; i
< n
; i
++) {
5405 /* Emit a copy of the original instruction with the lowered width.
5406 * If the EOT flag was set throw it away except for the last
5407 * instruction to avoid killing the thread prematurely.
5409 fs_inst split_inst
= *inst
;
5410 split_inst
.exec_size
= lower_width
;
5411 split_inst
.eot
= inst
->eot
&& i
== 0;
5413 /* Select the correct channel enables for the i-th group, then
5414 * transform the sources and destination and emit the lowered
5417 const fs_builder lbld
= ibld
.group(lower_width
, i
);
5419 for (unsigned j
= 0; j
< inst
->sources
; j
++)
5420 split_inst
.src
[j
] = emit_unzip(lbld
.at(block
, inst
), inst
, j
);
5422 split_inst
.dst
= emit_zip(lbld
.at(block
, inst
),
5423 lbld
.at(block
, after_inst
), inst
);
5424 split_inst
.size_written
=
5425 split_inst
.dst
.component_size(lower_width
) * dst_size
;
5427 lbld
.at(block
, inst
->next
).emit(split_inst
);
5430 inst
->remove(block
);
5436 invalidate_live_intervals();
5442 fs_visitor::dump_instructions()
5444 dump_instructions(NULL
);
5448 fs_visitor::dump_instructions(const char *name
)
5450 FILE *file
= stderr
;
5451 if (name
&& geteuid() != 0) {
5452 file
= fopen(name
, "w");
5458 calculate_register_pressure();
5459 int ip
= 0, max_pressure
= 0;
5460 foreach_block_and_inst(block
, backend_instruction
, inst
, cfg
) {
5461 max_pressure
= MAX2(max_pressure
, regs_live_at_ip
[ip
]);
5462 fprintf(file
, "{%3d} %4d: ", regs_live_at_ip
[ip
], ip
);
5463 dump_instruction(inst
, file
);
5466 fprintf(file
, "Maximum %3d registers live at once.\n", max_pressure
);
5469 foreach_in_list(backend_instruction
, inst
, &instructions
) {
5470 fprintf(file
, "%4d: ", ip
++);
5471 dump_instruction(inst
, file
);
5475 if (file
!= stderr
) {
5481 fs_visitor::dump_instruction(backend_instruction
*be_inst
)
5483 dump_instruction(be_inst
, stderr
);
5487 fs_visitor::dump_instruction(backend_instruction
*be_inst
, FILE *file
)
5489 fs_inst
*inst
= (fs_inst
*)be_inst
;
5491 if (inst
->predicate
) {
5492 fprintf(file
, "(%cf%d.%d) ",
5493 inst
->predicate_inverse
? '-' : '+',
5494 inst
->flag_subreg
/ 2,
5495 inst
->flag_subreg
% 2);
5498 fprintf(file
, "%s", brw_instruction_name(devinfo
, inst
->opcode
));
5500 fprintf(file
, ".sat");
5501 if (inst
->conditional_mod
) {
5502 fprintf(file
, "%s", conditional_modifier
[inst
->conditional_mod
]);
5503 if (!inst
->predicate
&&
5504 (devinfo
->gen
< 5 || (inst
->opcode
!= BRW_OPCODE_SEL
&&
5505 inst
->opcode
!= BRW_OPCODE_IF
&&
5506 inst
->opcode
!= BRW_OPCODE_WHILE
))) {
5507 fprintf(file
, ".f%d.%d", inst
->flag_subreg
/ 2,
5508 inst
->flag_subreg
% 2);
5511 fprintf(file
, "(%d) ", inst
->exec_size
);
5514 fprintf(file
, "(mlen: %d) ", inst
->mlen
);
5518 fprintf(file
, "(EOT) ");
5521 switch (inst
->dst
.file
) {
5523 fprintf(file
, "vgrf%d", inst
->dst
.nr
);
5526 fprintf(file
, "g%d", inst
->dst
.nr
);
5529 fprintf(file
, "m%d", inst
->dst
.nr
);
5532 fprintf(file
, "(null)");
5535 fprintf(file
, "***u%d***", inst
->dst
.nr
);
5538 fprintf(file
, "***attr%d***", inst
->dst
.nr
);
5541 switch (inst
->dst
.nr
) {
5543 fprintf(file
, "null");
5545 case BRW_ARF_ADDRESS
:
5546 fprintf(file
, "a0.%d", inst
->dst
.subnr
);
5548 case BRW_ARF_ACCUMULATOR
:
5549 fprintf(file
, "acc%d", inst
->dst
.subnr
);
5552 fprintf(file
, "f%d.%d", inst
->dst
.nr
& 0xf, inst
->dst
.subnr
);
5555 fprintf(file
, "arf%d.%d", inst
->dst
.nr
& 0xf, inst
->dst
.subnr
);
5560 unreachable("not reached");
5563 if (inst
->dst
.offset
||
5564 (inst
->dst
.file
== VGRF
&&
5565 alloc
.sizes
[inst
->dst
.nr
] * REG_SIZE
!= inst
->size_written
)) {
5566 const unsigned reg_size
= (inst
->dst
.file
== UNIFORM
? 4 : REG_SIZE
);
5567 fprintf(file
, "+%d.%d", inst
->dst
.offset
/ reg_size
,
5568 inst
->dst
.offset
% reg_size
);
5571 if (inst
->dst
.stride
!= 1)
5572 fprintf(file
, "<%u>", inst
->dst
.stride
);
5573 fprintf(file
, ":%s, ", brw_reg_type_to_letters(inst
->dst
.type
));
5575 for (int i
= 0; i
< inst
->sources
; i
++) {
5576 if (inst
->src
[i
].negate
)
5578 if (inst
->src
[i
].abs
)
5580 switch (inst
->src
[i
].file
) {
5582 fprintf(file
, "vgrf%d", inst
->src
[i
].nr
);
5585 fprintf(file
, "g%d", inst
->src
[i
].nr
);
5588 fprintf(file
, "***m%d***", inst
->src
[i
].nr
);
5591 fprintf(file
, "attr%d", inst
->src
[i
].nr
);
5594 fprintf(file
, "u%d", inst
->src
[i
].nr
);
5597 fprintf(file
, "(null)");
5600 switch (inst
->src
[i
].type
) {
5601 case BRW_REGISTER_TYPE_F
:
5602 fprintf(file
, "%-gf", inst
->src
[i
].f
);
5604 case BRW_REGISTER_TYPE_DF
:
5605 fprintf(file
, "%fdf", inst
->src
[i
].df
);
5607 case BRW_REGISTER_TYPE_W
:
5608 case BRW_REGISTER_TYPE_D
:
5609 fprintf(file
, "%dd", inst
->src
[i
].d
);
5611 case BRW_REGISTER_TYPE_UW
:
5612 case BRW_REGISTER_TYPE_UD
:
5613 fprintf(file
, "%uu", inst
->src
[i
].ud
);
5615 case BRW_REGISTER_TYPE_VF
:
5616 fprintf(file
, "[%-gF, %-gF, %-gF, %-gF]",
5617 brw_vf_to_float((inst
->src
[i
].ud
>> 0) & 0xff),
5618 brw_vf_to_float((inst
->src
[i
].ud
>> 8) & 0xff),
5619 brw_vf_to_float((inst
->src
[i
].ud
>> 16) & 0xff),
5620 brw_vf_to_float((inst
->src
[i
].ud
>> 24) & 0xff));
5623 fprintf(file
, "???");
5628 switch (inst
->src
[i
].nr
) {
5630 fprintf(file
, "null");
5632 case BRW_ARF_ADDRESS
:
5633 fprintf(file
, "a0.%d", inst
->src
[i
].subnr
);
5635 case BRW_ARF_ACCUMULATOR
:
5636 fprintf(file
, "acc%d", inst
->src
[i
].subnr
);
5639 fprintf(file
, "f%d.%d", inst
->src
[i
].nr
& 0xf, inst
->src
[i
].subnr
);
5642 fprintf(file
, "arf%d.%d", inst
->src
[i
].nr
& 0xf, inst
->src
[i
].subnr
);
5648 if (inst
->src
[i
].offset
||
5649 (inst
->src
[i
].file
== VGRF
&&
5650 alloc
.sizes
[inst
->src
[i
].nr
] * REG_SIZE
!= inst
->size_read(i
))) {
5651 const unsigned reg_size
= (inst
->src
[i
].file
== UNIFORM
? 4 : REG_SIZE
);
5652 fprintf(file
, "+%d.%d", inst
->src
[i
].offset
/ reg_size
,
5653 inst
->src
[i
].offset
% reg_size
);
5656 if (inst
->src
[i
].abs
)
5659 if (inst
->src
[i
].file
!= IMM
) {
5661 if (inst
->src
[i
].file
== ARF
|| inst
->src
[i
].file
== FIXED_GRF
) {
5662 unsigned hstride
= inst
->src
[i
].hstride
;
5663 stride
= (hstride
== 0 ? 0 : (1 << (hstride
- 1)));
5665 stride
= inst
->src
[i
].stride
;
5668 fprintf(file
, "<%u>", stride
);
5670 fprintf(file
, ":%s", brw_reg_type_to_letters(inst
->src
[i
].type
));
5673 if (i
< inst
->sources
- 1 && inst
->src
[i
+ 1].file
!= BAD_FILE
)
5674 fprintf(file
, ", ");
5679 if (inst
->force_writemask_all
)
5680 fprintf(file
, "NoMask ");
5682 if (inst
->exec_size
!= dispatch_width
)
5683 fprintf(file
, "group%d ", inst
->group
);
5685 fprintf(file
, "\n");
5689 * Possibly returns an instruction that set up @param reg.
5691 * Sometimes we want to take the result of some expression/variable
5692 * dereference tree and rewrite the instruction generating the result
5693 * of the tree. When processing the tree, we know that the
5694 * instructions generated are all writing temporaries that are dead
5695 * outside of this tree. So, if we have some instructions that write
5696 * a temporary, we're free to point that temp write somewhere else.
5698 * Note that this doesn't guarantee that the instruction generated
5699 * only reg -- it might be the size=4 destination of a texture instruction.
5702 fs_visitor::get_instruction_generating_reg(fs_inst
*start
,
5707 end
->is_partial_write() ||
5708 !reg
.equals(end
->dst
)) {
5716 fs_visitor::setup_fs_payload_gen6()
5718 assert(stage
== MESA_SHADER_FRAGMENT
);
5719 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
5721 assert(devinfo
->gen
>= 6);
5723 /* R0-1: masks, pixel X/Y coordinates. */
5724 payload
.num_regs
= 2;
5725 /* R2: only for 32-pixel dispatch.*/
5727 /* R3-26: barycentric interpolation coordinates. These appear in the
5728 * same order that they appear in the brw_barycentric_mode
5729 * enum. Each set of coordinates occupies 2 registers if dispatch width
5730 * == 8 and 4 registers if dispatch width == 16. Coordinates only
5731 * appear if they were enabled using the "Barycentric Interpolation
5732 * Mode" bits in WM_STATE.
5734 for (int i
= 0; i
< BRW_BARYCENTRIC_MODE_COUNT
; ++i
) {
5735 if (prog_data
->barycentric_interp_modes
& (1 << i
)) {
5736 payload
.barycentric_coord_reg
[i
] = payload
.num_regs
;
5737 payload
.num_regs
+= 2;
5738 if (dispatch_width
== 16) {
5739 payload
.num_regs
+= 2;
5744 /* R27: interpolated depth if uses source depth */
5745 prog_data
->uses_src_depth
=
5746 (nir
->info
.inputs_read
& (1 << VARYING_SLOT_POS
)) != 0;
5747 if (prog_data
->uses_src_depth
) {
5748 payload
.source_depth_reg
= payload
.num_regs
;
5750 if (dispatch_width
== 16) {
5751 /* R28: interpolated depth if not SIMD8. */
5756 /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W. */
5757 prog_data
->uses_src_w
=
5758 (nir
->info
.inputs_read
& (1 << VARYING_SLOT_POS
)) != 0;
5759 if (prog_data
->uses_src_w
) {
5760 payload
.source_w_reg
= payload
.num_regs
;
5762 if (dispatch_width
== 16) {
5763 /* R30: interpolated W if not SIMD8. */
5768 /* R31: MSAA position offsets. */
5769 if (prog_data
->persample_dispatch
&&
5770 (nir
->info
.system_values_read
& SYSTEM_BIT_SAMPLE_POS
)) {
5771 /* From the Ivy Bridge PRM documentation for 3DSTATE_PS:
5773 * "MSDISPMODE_PERSAMPLE is required in order to select
5776 * So we can only really get sample positions if we are doing real
5777 * per-sample dispatch. If we need gl_SamplePosition and we don't have
5778 * persample dispatch, we hard-code it to 0.5.
5780 prog_data
->uses_pos_offset
= true;
5781 payload
.sample_pos_reg
= payload
.num_regs
;
5785 /* R32: MSAA input coverage mask */
5786 prog_data
->uses_sample_mask
=
5787 (nir
->info
.system_values_read
& SYSTEM_BIT_SAMPLE_MASK_IN
) != 0;
5788 if (prog_data
->uses_sample_mask
) {
5789 assert(devinfo
->gen
>= 7);
5790 payload
.sample_mask_in_reg
= payload
.num_regs
;
5792 if (dispatch_width
== 16) {
5793 /* R33: input coverage mask if not SIMD8. */
5798 /* R34-: bary for 32-pixel. */
5799 /* R58-59: interp W for 32-pixel. */
5801 if (nir
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
5802 source_depth_to_render_target
= true;
5807 fs_visitor::setup_vs_payload()
5809 /* R0: thread header, R1: urb handles */
5810 payload
.num_regs
= 2;
5814 fs_visitor::setup_gs_payload()
5816 assert(stage
== MESA_SHADER_GEOMETRY
);
5818 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
5819 struct brw_vue_prog_data
*vue_prog_data
= brw_vue_prog_data(prog_data
);
5821 /* R0: thread header, R1: output URB handles */
5822 payload
.num_regs
= 2;
5824 if (gs_prog_data
->include_primitive_id
) {
5825 /* R2: Primitive ID 0..7 */
5829 /* Always enable VUE handles so we can safely use pull model if needed.
5831 * The push model for a GS uses a ton of register space even for trivial
5832 * scenarios with just a few inputs, so just make things easier and a bit
5833 * safer by always having pull model available.
5835 gs_prog_data
->base
.include_vue_handles
= true;
5837 /* R3..RN: ICP Handles for each incoming vertex (when using pull model) */
5838 payload
.num_regs
+= nir
->info
.gs
.vertices_in
;
5840 /* Use a maximum of 24 registers for push-model inputs. */
5841 const unsigned max_push_components
= 24;
5843 /* If pushing our inputs would take too many registers, reduce the URB read
5844 * length (which is in HWords, or 8 registers), and resort to pulling.
5846 * Note that the GS reads <URB Read Length> HWords for every vertex - so we
5847 * have to multiply by VerticesIn to obtain the total storage requirement.
5849 if (8 * vue_prog_data
->urb_read_length
* nir
->info
.gs
.vertices_in
>
5850 max_push_components
) {
5851 vue_prog_data
->urb_read_length
=
5852 ROUND_DOWN_TO(max_push_components
/ nir
->info
.gs
.vertices_in
, 8) / 8;
5857 fs_visitor::setup_cs_payload()
5859 assert(devinfo
->gen
>= 7);
5860 payload
.num_regs
= 1;
5864 fs_visitor::calculate_register_pressure()
5866 invalidate_live_intervals();
5867 calculate_live_intervals();
5869 unsigned num_instructions
= 0;
5870 foreach_block(block
, cfg
)
5871 num_instructions
+= block
->instructions
.length();
5873 regs_live_at_ip
= rzalloc_array(mem_ctx
, int, num_instructions
);
5875 for (unsigned reg
= 0; reg
< alloc
.count
; reg
++) {
5876 for (int ip
= virtual_grf_start
[reg
]; ip
<= virtual_grf_end
[reg
]; ip
++)
5877 regs_live_at_ip
[ip
] += alloc
.sizes
[reg
];
5882 * Look for repeated FS_OPCODE_MOV_DISPATCH_TO_FLAGS and drop the later ones.
5884 * The needs_unlit_centroid_workaround ends up producing one of these per
5885 * channel of centroid input, so it's good to clean them up.
5887 * An assumption here is that nothing ever modifies the dispatched pixels
5888 * value that FS_OPCODE_MOV_DISPATCH_TO_FLAGS reads from, but the hardware
5889 * dictates that anyway.
5892 fs_visitor::opt_drop_redundant_mov_to_flags()
5894 bool flag_mov_found
[4] = {false};
5895 bool progress
= false;
5897 /* Instructions removed by this pass can only be added if this were true */
5898 if (!devinfo
->needs_unlit_centroid_workaround
)
5901 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
5902 if (inst
->is_control_flow()) {
5903 memset(flag_mov_found
, 0, sizeof(flag_mov_found
));
5904 } else if (inst
->opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
) {
5905 if (!flag_mov_found
[inst
->flag_subreg
]) {
5906 flag_mov_found
[inst
->flag_subreg
] = true;
5908 inst
->remove(block
);
5911 } else if (inst
->flags_written()) {
5912 flag_mov_found
[inst
->flag_subreg
] = false;
5920 fs_visitor::optimize()
5922 /* Start by validating the shader we currently have. */
5925 /* bld is the common builder object pointing at the end of the program we
5926 * used to translate it into i965 IR. For the optimization and lowering
5927 * passes coming next, any code added after the end of the program without
5928 * having explicitly called fs_builder::at() clearly points at a mistake.
5929 * Ideally optimization passes wouldn't be part of the visitor so they
5930 * wouldn't have access to bld at all, but they do, so just in case some
5931 * pass forgets to ask for a location explicitly set it to NULL here to
5932 * make it trip. The dispatch width is initialized to a bogus value to
5933 * make sure that optimizations set the execution controls explicitly to
5934 * match the code they are manipulating instead of relying on the defaults.
5936 bld
= fs_builder(this, 64);
5938 assign_constant_locations();
5939 lower_constant_loads();
5943 split_virtual_grfs();
5946 #define OPT(pass, args...) ({ \
5948 bool this_progress = pass(args); \
5950 if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
5951 char filename[64]; \
5952 snprintf(filename, 64, "%s%d-%s-%02d-%02d-" #pass, \
5953 stage_abbrev, dispatch_width, nir->info.name, iteration, pass_num); \
5955 backend_shader::dump_instructions(filename); \
5960 progress = progress || this_progress; \
5964 if (unlikely(INTEL_DEBUG
& DEBUG_OPTIMIZER
)) {
5966 snprintf(filename
, 64, "%s%d-%s-00-00-start",
5967 stage_abbrev
, dispatch_width
, nir
->info
.name
);
5969 backend_shader::dump_instructions(filename
);
5972 bool progress
= false;
5976 OPT(opt_drop_redundant_mov_to_flags
);
5977 OPT(remove_extra_rounding_modes
);
5984 OPT(remove_duplicate_mrf_writes
);
5988 OPT(opt_copy_propagation
);
5989 OPT(opt_predicated_break
, this);
5990 OPT(opt_cmod_propagation
);
5991 OPT(dead_code_eliminate
);
5992 OPT(opt_peephole_sel
);
5993 OPT(dead_control_flow_eliminate
, this);
5994 OPT(opt_register_renaming
);
5995 OPT(opt_saturate_propagation
);
5996 OPT(register_coalesce
);
5997 OPT(compute_to_mrf
);
5998 OPT(eliminate_find_live_channel
);
6000 OPT(compact_virtual_grfs
);
6006 if (OPT(lower_pack
)) {
6007 OPT(register_coalesce
);
6008 OPT(dead_code_eliminate
);
6011 OPT(lower_simd_width
);
6013 /* After SIMD lowering just in case we had to unroll the EOT send. */
6014 OPT(opt_sampler_eot
);
6016 OPT(lower_logical_sends
);
6019 OPT(opt_copy_propagation
);
6020 /* Only run after logical send lowering because it's easier to implement
6021 * in terms of physical sends.
6023 if (OPT(opt_zero_samples
))
6024 OPT(opt_copy_propagation
);
6025 /* Run after logical send lowering to give it a chance to CSE the
6026 * LOAD_PAYLOAD instructions created to construct the payloads of
6027 * e.g. texturing messages in cases where it wasn't possible to CSE the
6028 * whole logical instruction.
6031 OPT(register_coalesce
);
6032 OPT(compute_to_mrf
);
6033 OPT(dead_code_eliminate
);
6034 OPT(remove_duplicate_mrf_writes
);
6035 OPT(opt_peephole_sel
);
6038 OPT(opt_redundant_discard_jumps
);
6040 if (OPT(lower_load_payload
)) {
6041 split_virtual_grfs();
6042 OPT(register_coalesce
);
6043 OPT(compute_to_mrf
);
6044 OPT(dead_code_eliminate
);
6047 OPT(opt_combine_constants
);
6048 OPT(lower_integer_multiplication
);
6050 if (devinfo
->gen
<= 5 && OPT(lower_minmax
)) {
6051 OPT(opt_cmod_propagation
);
6053 OPT(opt_copy_propagation
);
6054 OPT(dead_code_eliminate
);
6057 if (OPT(lower_conversions
)) {
6058 OPT(opt_copy_propagation
);
6059 OPT(dead_code_eliminate
);
6060 OPT(lower_simd_width
);
6063 lower_uniform_pull_constant_loads();
6069 * Three source instruction must have a GRF/MRF destination register.
6070 * ARF NULL is not allowed. Fix that up by allocating a temporary GRF.
6073 fs_visitor::fixup_3src_null_dest()
6075 bool progress
= false;
6077 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
6078 if (inst
->is_3src(devinfo
) && inst
->dst
.is_null()) {
6079 inst
->dst
= fs_reg(VGRF
, alloc
.allocate(dispatch_width
/ 8),
6086 invalidate_live_intervals();
6090 fs_visitor::allocate_registers(unsigned min_dispatch_width
, bool allow_spilling
)
6092 bool allocated_without_spills
;
6094 static const enum instruction_scheduler_mode pre_modes
[] = {
6096 SCHEDULE_PRE_NON_LIFO
,
6100 bool spill_all
= allow_spilling
&& (INTEL_DEBUG
& DEBUG_SPILL_FS
);
6102 /* Try each scheduling heuristic to see if it can successfully register
6103 * allocate without spilling. They should be ordered by decreasing
6104 * performance but increasing likelihood of allocating.
6106 for (unsigned i
= 0; i
< ARRAY_SIZE(pre_modes
); i
++) {
6107 schedule_instructions(pre_modes
[i
]);
6110 assign_regs_trivial();
6111 allocated_without_spills
= true;
6113 allocated_without_spills
= assign_regs(false, spill_all
);
6115 if (allocated_without_spills
)
6119 if (!allocated_without_spills
) {
6120 if (!allow_spilling
)
6121 fail("Failure to register allocate and spilling is not allowed.");
6123 /* We assume that any spilling is worse than just dropping back to
6124 * SIMD8. There's probably actually some intermediate point where
6125 * SIMD16 with a couple of spills is still better.
6127 if (dispatch_width
> min_dispatch_width
) {
6128 fail("Failure to register allocate. Reduce number of "
6129 "live scalar values to avoid this.");
6131 compiler
->shader_perf_log(log_data
,
6132 "%s shader triggered register spilling. "
6133 "Try reducing the number of live scalar "
6134 "values to improve performance.\n",
6138 /* Since we're out of heuristics, just go spill registers until we
6139 * get an allocation.
6141 while (!assign_regs(true, spill_all
)) {
6147 /* This must come after all optimization and register allocation, since
6148 * it inserts dead code that happens to have side effects, and it does
6149 * so based on the actual physical registers in use.
6151 insert_gen4_send_dependency_workarounds();
6156 opt_bank_conflicts();
6158 schedule_instructions(SCHEDULE_POST
);
6160 if (last_scratch
> 0) {
6161 MAYBE_UNUSED
unsigned max_scratch_size
= 2 * 1024 * 1024;
6163 prog_data
->total_scratch
= brw_get_scratch_size(last_scratch
);
6165 if (stage
== MESA_SHADER_COMPUTE
) {
6166 if (devinfo
->is_haswell
) {
6167 /* According to the MEDIA_VFE_STATE's "Per Thread Scratch Space"
6168 * field documentation, Haswell supports a minimum of 2kB of
6169 * scratch space for compute shaders, unlike every other stage
6172 prog_data
->total_scratch
= MAX2(prog_data
->total_scratch
, 2048);
6173 } else if (devinfo
->gen
<= 7) {
6174 /* According to the MEDIA_VFE_STATE's "Per Thread Scratch Space"
6175 * field documentation, platforms prior to Haswell measure scratch
6176 * size linearly with a range of [1kB, 12kB] and 1kB granularity.
6178 prog_data
->total_scratch
= ALIGN(last_scratch
, 1024);
6179 max_scratch_size
= 12 * 1024;
6183 /* We currently only support up to 2MB of scratch space. If we
6184 * need to support more eventually, the documentation suggests
6185 * that we could allocate a larger buffer, and partition it out
6186 * ourselves. We'd just have to undo the hardware's address
6187 * calculation by subtracting (FFTID * Per Thread Scratch Space)
6188 * and then add FFTID * (Larger Per Thread Scratch Space).
6190 * See 3D-Media-GPGPU Engine > Media GPGPU Pipeline >
6191 * Thread Group Tracking > Local Memory/Scratch Space.
6193 assert(prog_data
->total_scratch
< max_scratch_size
);
6198 fs_visitor::run_vs()
6200 assert(stage
== MESA_SHADER_VERTEX
);
6204 if (shader_time_index
>= 0)
6205 emit_shader_time_begin();
6212 compute_clip_distance();
6216 if (shader_time_index
>= 0)
6217 emit_shader_time_end();
6223 assign_curb_setup();
6224 assign_vs_urb_setup();
6226 fixup_3src_null_dest();
6227 allocate_registers(8, true);
6233 fs_visitor::run_tcs_single_patch()
6235 assert(stage
== MESA_SHADER_TESS_CTRL
);
6237 struct brw_tcs_prog_data
*tcs_prog_data
= brw_tcs_prog_data(prog_data
);
6239 /* r1-r4 contain the ICP handles. */
6240 payload
.num_regs
= 5;
6242 if (shader_time_index
>= 0)
6243 emit_shader_time_begin();
6245 /* Initialize gl_InvocationID */
6246 fs_reg channels_uw
= bld
.vgrf(BRW_REGISTER_TYPE_UW
);
6247 fs_reg channels_ud
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
6248 bld
.MOV(channels_uw
, fs_reg(brw_imm_uv(0x76543210)));
6249 bld
.MOV(channels_ud
, channels_uw
);
6251 if (tcs_prog_data
->instances
== 1) {
6252 invocation_id
= channels_ud
;
6254 invocation_id
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
6256 /* Get instance number from g0.2 bits 23:17, and multiply it by 8. */
6257 fs_reg t
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
6258 fs_reg instance_times_8
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
6259 bld
.AND(t
, fs_reg(retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_UD
)),
6260 brw_imm_ud(INTEL_MASK(23, 17)));
6261 bld
.SHR(instance_times_8
, t
, brw_imm_ud(17 - 3));
6263 bld
.ADD(invocation_id
, instance_times_8
, channels_ud
);
6266 /* Fix the disptach mask */
6267 if (nir
->info
.tess
.tcs_vertices_out
% 8) {
6268 bld
.CMP(bld
.null_reg_ud(), invocation_id
,
6269 brw_imm_ud(nir
->info
.tess
.tcs_vertices_out
), BRW_CONDITIONAL_L
);
6270 bld
.IF(BRW_PREDICATE_NORMAL
);
6275 if (nir
->info
.tess
.tcs_vertices_out
% 8) {
6276 bld
.emit(BRW_OPCODE_ENDIF
);
6279 /* Emit EOT write; set TR DS Cache bit */
6281 fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)),
6282 fs_reg(brw_imm_ud(WRITEMASK_X
<< 16)),
6283 fs_reg(brw_imm_ud(0)),
6285 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 3);
6286 bld
.LOAD_PAYLOAD(payload
, srcs
, 3, 2);
6288 fs_inst
*inst
= bld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
,
6289 bld
.null_reg_ud(), payload
);
6293 if (shader_time_index
>= 0)
6294 emit_shader_time_end();
6303 assign_curb_setup();
6304 assign_tcs_single_patch_urb_setup();
6306 fixup_3src_null_dest();
6307 allocate_registers(8, true);
6313 fs_visitor::run_tes()
6315 assert(stage
== MESA_SHADER_TESS_EVAL
);
6317 /* R0: thread header, R1-3: gl_TessCoord.xyz, R4: URB handles */
6318 payload
.num_regs
= 5;
6320 if (shader_time_index
>= 0)
6321 emit_shader_time_begin();
6330 if (shader_time_index
>= 0)
6331 emit_shader_time_end();
6337 assign_curb_setup();
6338 assign_tes_urb_setup();
6340 fixup_3src_null_dest();
6341 allocate_registers(8, true);
6347 fs_visitor::run_gs()
6349 assert(stage
== MESA_SHADER_GEOMETRY
);
6353 this->final_gs_vertex_count
= vgrf(glsl_type::uint_type
);
6355 if (gs_compile
->control_data_header_size_bits
> 0) {
6356 /* Create a VGRF to store accumulated control data bits. */
6357 this->control_data_bits
= vgrf(glsl_type::uint_type
);
6359 /* If we're outputting more than 32 control data bits, then EmitVertex()
6360 * will set control_data_bits to 0 after emitting the first vertex.
6361 * Otherwise, we need to initialize it to 0 here.
6363 if (gs_compile
->control_data_header_size_bits
<= 32) {
6364 const fs_builder abld
= bld
.annotate("initialize control data bits");
6365 abld
.MOV(this->control_data_bits
, brw_imm_ud(0u));
6369 if (shader_time_index
>= 0)
6370 emit_shader_time_begin();
6374 emit_gs_thread_end();
6376 if (shader_time_index
>= 0)
6377 emit_shader_time_end();
6386 assign_curb_setup();
6387 assign_gs_urb_setup();
6389 fixup_3src_null_dest();
6390 allocate_registers(8, true);
6395 /* From the SKL PRM, Volume 16, Workarounds:
6397 * 0877 3D Pixel Shader Hang possible when pixel shader dispatched with
6398 * only header phases (R0-R2)
6400 * WA: Enable a non-header phase (e.g. push constant) when dispatch would
6401 * have been header only.
6403 * Instead of enabling push constants one can alternatively enable one of the
6404 * inputs. Here one simply chooses "layer" which shouldn't impose much
6408 gen9_ps_header_only_workaround(struct brw_wm_prog_data
*wm_prog_data
)
6410 if (wm_prog_data
->num_varying_inputs
)
6413 if (wm_prog_data
->base
.curb_read_length
)
6416 wm_prog_data
->urb_setup
[VARYING_SLOT_LAYER
] = 0;
6417 wm_prog_data
->num_varying_inputs
= 1;
6421 fs_visitor::run_fs(bool allow_spilling
, bool do_rep_send
)
6423 struct brw_wm_prog_data
*wm_prog_data
= brw_wm_prog_data(this->prog_data
);
6424 brw_wm_prog_key
*wm_key
= (brw_wm_prog_key
*) this->key
;
6426 assert(stage
== MESA_SHADER_FRAGMENT
);
6428 if (devinfo
->gen
>= 6)
6429 setup_fs_payload_gen6();
6431 setup_fs_payload_gen4();
6435 } else if (do_rep_send
) {
6436 assert(dispatch_width
== 16);
6437 emit_repclear_shader();
6439 if (shader_time_index
>= 0)
6440 emit_shader_time_begin();
6442 calculate_urb_setup();
6443 if (nir
->info
.inputs_read
> 0 ||
6444 (nir
->info
.outputs_read
> 0 && !wm_key
->coherent_fb_fetch
)) {
6445 if (devinfo
->gen
< 6)
6446 emit_interpolation_setup_gen4();
6448 emit_interpolation_setup_gen6();
6451 /* We handle discards by keeping track of the still-live pixels in f0.1.
6452 * Initialize it with the dispatched pixels.
6454 if (wm_prog_data
->uses_kill
) {
6455 fs_inst
*discard_init
= bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
6456 discard_init
->flag_subreg
= 1;
6459 /* Generate FS IR for main(). (the visitor only descends into
6460 * functions called "main").
6467 if (wm_prog_data
->uses_kill
)
6468 bld
.emit(FS_OPCODE_PLACEHOLDER_HALT
);
6470 if (wm_key
->alpha_test_func
)
6475 if (shader_time_index
>= 0)
6476 emit_shader_time_end();
6482 assign_curb_setup();
6484 if (devinfo
->gen
>= 9)
6485 gen9_ps_header_only_workaround(wm_prog_data
);
6489 fixup_3src_null_dest();
6490 allocate_registers(8, allow_spilling
);
6500 fs_visitor::run_cs(unsigned min_dispatch_width
)
6502 assert(stage
== MESA_SHADER_COMPUTE
);
6503 assert(dispatch_width
>= min_dispatch_width
);
6507 if (shader_time_index
>= 0)
6508 emit_shader_time_begin();
6510 if (devinfo
->is_haswell
&& prog_data
->total_shared
> 0) {
6511 /* Move SLM index from g0.0[27:24] to sr0.1[11:8] */
6512 const fs_builder abld
= bld
.exec_all().group(1, 0);
6513 abld
.MOV(retype(brw_sr0_reg(1), BRW_REGISTER_TYPE_UW
),
6514 suboffset(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UW
), 1));
6522 emit_cs_terminate();
6524 if (shader_time_index
>= 0)
6525 emit_shader_time_end();
6531 assign_curb_setup();
6533 fixup_3src_null_dest();
6534 allocate_registers(min_dispatch_width
, true);
6543 * Return a bitfield where bit n is set if barycentric interpolation mode n
6544 * (see enum brw_barycentric_mode) is needed by the fragment shader.
6546 * We examine the load_barycentric intrinsics rather than looking at input
6547 * variables so that we catch interpolateAtCentroid() messages too, which
6548 * also need the BRW_BARYCENTRIC_[NON]PERSPECTIVE_CENTROID mode set up.
6551 brw_compute_barycentric_interp_modes(const struct gen_device_info
*devinfo
,
6552 const nir_shader
*shader
)
6554 unsigned barycentric_interp_modes
= 0;
6556 nir_foreach_function(f
, shader
) {
6560 nir_foreach_block(block
, f
->impl
) {
6561 nir_foreach_instr(instr
, block
) {
6562 if (instr
->type
!= nir_instr_type_intrinsic
)
6565 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
6566 if (intrin
->intrinsic
!= nir_intrinsic_load_interpolated_input
)
6569 /* Ignore WPOS; it doesn't require interpolation. */
6570 if (nir_intrinsic_base(intrin
) == VARYING_SLOT_POS
)
6573 intrin
= nir_instr_as_intrinsic(intrin
->src
[0].ssa
->parent_instr
);
6574 enum glsl_interp_mode interp
= (enum glsl_interp_mode
)
6575 nir_intrinsic_interp_mode(intrin
);
6576 nir_intrinsic_op bary_op
= intrin
->intrinsic
;
6577 enum brw_barycentric_mode bary
=
6578 brw_barycentric_mode(interp
, bary_op
);
6580 barycentric_interp_modes
|= 1 << bary
;
6582 if (devinfo
->needs_unlit_centroid_workaround
&&
6583 bary_op
== nir_intrinsic_load_barycentric_centroid
)
6584 barycentric_interp_modes
|= 1 << centroid_to_pixel(bary
);
6589 return barycentric_interp_modes
;
6593 brw_compute_flat_inputs(struct brw_wm_prog_data
*prog_data
,
6594 const nir_shader
*shader
)
6596 prog_data
->flat_inputs
= 0;
6598 nir_foreach_variable(var
, &shader
->inputs
) {
6599 int input_index
= prog_data
->urb_setup
[var
->data
.location
];
6601 if (input_index
< 0)
6605 if (var
->data
.interpolation
== INTERP_MODE_FLAT
)
6606 prog_data
->flat_inputs
|= (1 << input_index
);
6611 computed_depth_mode(const nir_shader
*shader
)
6613 if (shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
6614 switch (shader
->info
.fs
.depth_layout
) {
6615 case FRAG_DEPTH_LAYOUT_NONE
:
6616 case FRAG_DEPTH_LAYOUT_ANY
:
6617 return BRW_PSCDEPTH_ON
;
6618 case FRAG_DEPTH_LAYOUT_GREATER
:
6619 return BRW_PSCDEPTH_ON_GE
;
6620 case FRAG_DEPTH_LAYOUT_LESS
:
6621 return BRW_PSCDEPTH_ON_LE
;
6622 case FRAG_DEPTH_LAYOUT_UNCHANGED
:
6623 return BRW_PSCDEPTH_OFF
;
6626 return BRW_PSCDEPTH_OFF
;
6630 * Move load_interpolated_input with simple (payload-based) barycentric modes
6631 * to the top of the program so we don't emit multiple PLNs for the same input.
6633 * This works around CSE not being able to handle non-dominating cases
6639 * interpolate the same exact input
6642 * This should be replaced by global value numbering someday.
6645 move_interpolation_to_top(nir_shader
*nir
)
6647 bool progress
= false;
6649 nir_foreach_function(f
, nir
) {
6653 nir_block
*top
= nir_start_block(f
->impl
);
6654 exec_node
*cursor_node
= NULL
;
6656 nir_foreach_block(block
, f
->impl
) {
6660 nir_foreach_instr_safe(instr
, block
) {
6661 if (instr
->type
!= nir_instr_type_intrinsic
)
6664 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
6665 if (intrin
->intrinsic
!= nir_intrinsic_load_interpolated_input
)
6667 nir_intrinsic_instr
*bary_intrinsic
=
6668 nir_instr_as_intrinsic(intrin
->src
[0].ssa
->parent_instr
);
6669 nir_intrinsic_op op
= bary_intrinsic
->intrinsic
;
6671 /* Leave interpolateAtSample/Offset() where they are. */
6672 if (op
== nir_intrinsic_load_barycentric_at_sample
||
6673 op
== nir_intrinsic_load_barycentric_at_offset
)
6676 nir_instr
*move
[3] = {
6677 &bary_intrinsic
->instr
,
6678 intrin
->src
[1].ssa
->parent_instr
,
6682 for (unsigned i
= 0; i
< ARRAY_SIZE(move
); i
++) {
6683 if (move
[i
]->block
!= top
) {
6684 move
[i
]->block
= top
;
6685 exec_node_remove(&move
[i
]->node
);
6687 exec_node_insert_after(cursor_node
, &move
[i
]->node
);
6689 exec_list_push_head(&top
->instr_list
, &move
[i
]->node
);
6691 cursor_node
= &move
[i
]->node
;
6697 nir_metadata_preserve(f
->impl
, (nir_metadata
)
6698 ((unsigned) nir_metadata_block_index
|
6699 (unsigned) nir_metadata_dominance
));
6706 * Demote per-sample barycentric intrinsics to centroid.
6708 * Useful when rendering to a non-multisampled buffer.
6711 demote_sample_qualifiers(nir_shader
*nir
)
6713 bool progress
= true;
6715 nir_foreach_function(f
, nir
) {
6720 nir_builder_init(&b
, f
->impl
);
6722 nir_foreach_block(block
, f
->impl
) {
6723 nir_foreach_instr_safe(instr
, block
) {
6724 if (instr
->type
!= nir_instr_type_intrinsic
)
6727 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
6728 if (intrin
->intrinsic
!= nir_intrinsic_load_barycentric_sample
&&
6729 intrin
->intrinsic
!= nir_intrinsic_load_barycentric_at_sample
)
6732 b
.cursor
= nir_before_instr(instr
);
6733 nir_ssa_def
*centroid
=
6734 nir_load_barycentric(&b
, nir_intrinsic_load_barycentric_centroid
,
6735 nir_intrinsic_interp_mode(intrin
));
6736 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
,
6737 nir_src_for_ssa(centroid
));
6738 nir_instr_remove(instr
);
6743 nir_metadata_preserve(f
->impl
, (nir_metadata
)
6744 ((unsigned) nir_metadata_block_index
|
6745 (unsigned) nir_metadata_dominance
));
6752 * Pre-gen6, the register file of the EUs was shared between threads,
6753 * and each thread used some subset allocated on a 16-register block
6754 * granularity. The unit states wanted these block counts.
6757 brw_register_blocks(int reg_count
)
6759 return ALIGN(reg_count
, 16) / 16 - 1;
6763 brw_compile_fs(const struct brw_compiler
*compiler
, void *log_data
,
6765 const struct brw_wm_prog_key
*key
,
6766 struct brw_wm_prog_data
*prog_data
,
6767 const nir_shader
*src_shader
,
6768 struct gl_program
*prog
,
6769 int shader_time_index8
, int shader_time_index16
,
6770 bool allow_spilling
,
6771 bool use_rep_send
, struct brw_vue_map
*vue_map
,
6774 const struct gen_device_info
*devinfo
= compiler
->devinfo
;
6776 nir_shader
*shader
= nir_shader_clone(mem_ctx
, src_shader
);
6777 shader
= brw_nir_apply_sampler_key(shader
, compiler
, &key
->tex
, true);
6778 brw_nir_lower_fs_inputs(shader
, devinfo
, key
);
6779 brw_nir_lower_fs_outputs(shader
);
6781 if (devinfo
->gen
< 6) {
6782 brw_setup_vue_interpolation(vue_map
, shader
, prog_data
, devinfo
);
6785 if (!key
->multisample_fbo
)
6786 NIR_PASS_V(shader
, demote_sample_qualifiers
);
6787 NIR_PASS_V(shader
, move_interpolation_to_top
);
6788 shader
= brw_postprocess_nir(shader
, compiler
, true);
6790 /* key->alpha_test_func means simulating alpha testing via discards,
6791 * so the shader definitely kills pixels.
6793 prog_data
->uses_kill
= shader
->info
.fs
.uses_discard
||
6794 key
->alpha_test_func
;
6795 prog_data
->uses_omask
= key
->multisample_fbo
&&
6796 shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK
);
6797 prog_data
->computed_depth_mode
= computed_depth_mode(shader
);
6798 prog_data
->computed_stencil
=
6799 shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_STENCIL
);
6801 prog_data
->persample_dispatch
=
6802 key
->multisample_fbo
&&
6803 (key
->persample_interp
||
6804 (shader
->info
.system_values_read
& (SYSTEM_BIT_SAMPLE_ID
|
6805 SYSTEM_BIT_SAMPLE_POS
)) ||
6806 shader
->info
.fs
.uses_sample_qualifier
||
6807 shader
->info
.outputs_read
);
6809 prog_data
->has_render_target_reads
= shader
->info
.outputs_read
!= 0ull;
6811 prog_data
->early_fragment_tests
= shader
->info
.fs
.early_fragment_tests
;
6812 prog_data
->post_depth_coverage
= shader
->info
.fs
.post_depth_coverage
;
6813 prog_data
->inner_coverage
= shader
->info
.fs
.inner_coverage
;
6815 prog_data
->barycentric_interp_modes
=
6816 brw_compute_barycentric_interp_modes(compiler
->devinfo
, shader
);
6818 cfg_t
*simd8_cfg
= NULL
, *simd16_cfg
= NULL
;
6819 uint8_t simd8_grf_start
= 0, simd16_grf_start
= 0;
6820 unsigned simd8_grf_used
= 0, simd16_grf_used
= 0;
6822 fs_visitor
v8(compiler
, log_data
, mem_ctx
, key
,
6823 &prog_data
->base
, prog
, shader
, 8,
6824 shader_time_index8
);
6825 if (!v8
.run_fs(allow_spilling
, false /* do_rep_send */)) {
6827 *error_str
= ralloc_strdup(mem_ctx
, v8
.fail_msg
);
6830 } else if (likely(!(INTEL_DEBUG
& DEBUG_NO8
))) {
6832 simd8_grf_start
= v8
.payload
.num_regs
;
6833 simd8_grf_used
= v8
.grf_used
;
6836 if (v8
.max_dispatch_width
>= 16 &&
6837 likely(!(INTEL_DEBUG
& DEBUG_NO16
) || use_rep_send
)) {
6838 /* Try a SIMD16 compile */
6839 fs_visitor
v16(compiler
, log_data
, mem_ctx
, key
,
6840 &prog_data
->base
, prog
, shader
, 16,
6841 shader_time_index16
);
6842 v16
.import_uniforms(&v8
);
6843 if (!v16
.run_fs(allow_spilling
, use_rep_send
)) {
6844 compiler
->shader_perf_log(log_data
,
6845 "SIMD16 shader failed to compile: %s",
6848 simd16_cfg
= v16
.cfg
;
6849 simd16_grf_start
= v16
.payload
.num_regs
;
6850 simd16_grf_used
= v16
.grf_used
;
6854 /* When the caller requests a repclear shader, they want SIMD16-only */
6858 /* Prior to Iron Lake, the PS had a single shader offset with a jump table
6859 * at the top to select the shader. We've never implemented that.
6860 * Instead, we just give them exactly one shader and we pick the widest one
6863 if (compiler
->devinfo
->gen
< 5 && simd16_cfg
)
6866 if (prog_data
->persample_dispatch
) {
6867 /* Starting with SandyBridge (where we first get MSAA), the different
6868 * pixel dispatch combinations are grouped into classifications A
6869 * through F (SNB PRM Vol. 2 Part 1 Section 7.7.1). On all hardware
6870 * generations, the only configurations supporting persample dispatch
6871 * are are this in which only one dispatch width is enabled.
6873 * If computed depth is enabled, SNB only allows SIMD8 while IVB+
6874 * allow SIMD8 or SIMD16 so we choose SIMD16 if available.
6876 if (compiler
->devinfo
->gen
== 6 &&
6877 prog_data
->computed_depth_mode
!= BRW_PSCDEPTH_OFF
) {
6879 } else if (simd16_cfg
) {
6884 /* We have to compute the flat inputs after the visitor is finished running
6885 * because it relies on prog_data->urb_setup which is computed in
6886 * fs_visitor::calculate_urb_setup().
6888 brw_compute_flat_inputs(prog_data
, shader
);
6890 fs_generator
g(compiler
, log_data
, mem_ctx
, (void *) key
, &prog_data
->base
,
6891 v8
.promoted_constants
, v8
.runtime_check_aads_emit
,
6892 MESA_SHADER_FRAGMENT
);
6894 if (unlikely(INTEL_DEBUG
& DEBUG_WM
)) {
6895 g
.enable_debug(ralloc_asprintf(mem_ctx
, "%s fragment shader %s",
6896 shader
->info
.label
?
6897 shader
->info
.label
: "unnamed",
6898 shader
->info
.name
));
6902 prog_data
->dispatch_8
= true;
6903 g
.generate_code(simd8_cfg
, 8);
6904 prog_data
->base
.dispatch_grf_start_reg
= simd8_grf_start
;
6905 prog_data
->reg_blocks_0
= brw_register_blocks(simd8_grf_used
);
6908 prog_data
->dispatch_16
= true;
6909 prog_data
->prog_offset_2
= g
.generate_code(simd16_cfg
, 16);
6910 prog_data
->dispatch_grf_start_reg_2
= simd16_grf_start
;
6911 prog_data
->reg_blocks_2
= brw_register_blocks(simd16_grf_used
);
6913 } else if (simd16_cfg
) {
6914 prog_data
->dispatch_16
= true;
6915 g
.generate_code(simd16_cfg
, 16);
6916 prog_data
->base
.dispatch_grf_start_reg
= simd16_grf_start
;
6917 prog_data
->reg_blocks_0
= brw_register_blocks(simd16_grf_used
);
6920 return g
.get_assembly(&prog_data
->base
.program_size
);
6924 fs_visitor::emit_cs_work_group_id_setup()
6926 assert(stage
== MESA_SHADER_COMPUTE
);
6928 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::uvec3_type
));
6930 struct brw_reg
r0_1(retype(brw_vec1_grf(0, 1), BRW_REGISTER_TYPE_UD
));
6931 struct brw_reg
r0_6(retype(brw_vec1_grf(0, 6), BRW_REGISTER_TYPE_UD
));
6932 struct brw_reg
r0_7(retype(brw_vec1_grf(0, 7), BRW_REGISTER_TYPE_UD
));
6934 bld
.MOV(*reg
, r0_1
);
6935 bld
.MOV(offset(*reg
, bld
, 1), r0_6
);
6936 bld
.MOV(offset(*reg
, bld
, 2), r0_7
);
6942 fill_push_const_block_info(struct brw_push_const_block
*block
, unsigned dwords
)
6944 block
->dwords
= dwords
;
6945 block
->regs
= DIV_ROUND_UP(dwords
, 8);
6946 block
->size
= block
->regs
* 32;
6950 cs_fill_push_const_info(const struct gen_device_info
*devinfo
,
6951 struct brw_cs_prog_data
*cs_prog_data
)
6953 const struct brw_stage_prog_data
*prog_data
= &cs_prog_data
->base
;
6954 int subgroup_id_index
= get_subgroup_id_param_index(prog_data
);
6955 bool cross_thread_supported
= devinfo
->gen
> 7 || devinfo
->is_haswell
;
6957 /* The thread ID should be stored in the last param dword */
6958 assert(subgroup_id_index
== -1 ||
6959 subgroup_id_index
== (int)prog_data
->nr_params
- 1);
6961 unsigned cross_thread_dwords
, per_thread_dwords
;
6962 if (!cross_thread_supported
) {
6963 cross_thread_dwords
= 0u;
6964 per_thread_dwords
= prog_data
->nr_params
;
6965 } else if (subgroup_id_index
>= 0) {
6966 /* Fill all but the last register with cross-thread payload */
6967 cross_thread_dwords
= 8 * (subgroup_id_index
/ 8);
6968 per_thread_dwords
= prog_data
->nr_params
- cross_thread_dwords
;
6969 assert(per_thread_dwords
> 0 && per_thread_dwords
<= 8);
6971 /* Fill all data using cross-thread payload */
6972 cross_thread_dwords
= prog_data
->nr_params
;
6973 per_thread_dwords
= 0u;
6976 fill_push_const_block_info(&cs_prog_data
->push
.cross_thread
, cross_thread_dwords
);
6977 fill_push_const_block_info(&cs_prog_data
->push
.per_thread
, per_thread_dwords
);
6979 unsigned total_dwords
=
6980 (cs_prog_data
->push
.per_thread
.size
* cs_prog_data
->threads
+
6981 cs_prog_data
->push
.cross_thread
.size
) / 4;
6982 fill_push_const_block_info(&cs_prog_data
->push
.total
, total_dwords
);
6984 assert(cs_prog_data
->push
.cross_thread
.dwords
% 8 == 0 ||
6985 cs_prog_data
->push
.per_thread
.size
== 0);
6986 assert(cs_prog_data
->push
.cross_thread
.dwords
+
6987 cs_prog_data
->push
.per_thread
.dwords
==
6988 prog_data
->nr_params
);
6992 cs_set_simd_size(struct brw_cs_prog_data
*cs_prog_data
, unsigned size
)
6994 cs_prog_data
->simd_size
= size
;
6995 unsigned group_size
= cs_prog_data
->local_size
[0] *
6996 cs_prog_data
->local_size
[1] * cs_prog_data
->local_size
[2];
6997 cs_prog_data
->threads
= (group_size
+ size
- 1) / size
;
7001 compile_cs_to_nir(const struct brw_compiler
*compiler
,
7003 const struct brw_cs_prog_key
*key
,
7004 struct brw_cs_prog_data
*prog_data
,
7005 const nir_shader
*src_shader
,
7006 unsigned dispatch_width
)
7008 nir_shader
*shader
= nir_shader_clone(mem_ctx
, src_shader
);
7009 shader
= brw_nir_apply_sampler_key(shader
, compiler
, &key
->tex
, true);
7010 brw_nir_lower_cs_intrinsics(shader
, dispatch_width
);
7011 return brw_postprocess_nir(shader
, compiler
, true);
7015 brw_compile_cs(const struct brw_compiler
*compiler
, void *log_data
,
7017 const struct brw_cs_prog_key
*key
,
7018 struct brw_cs_prog_data
*prog_data
,
7019 const nir_shader
*src_shader
,
7020 int shader_time_index
,
7023 prog_data
->local_size
[0] = src_shader
->info
.cs
.local_size
[0];
7024 prog_data
->local_size
[1] = src_shader
->info
.cs
.local_size
[1];
7025 prog_data
->local_size
[2] = src_shader
->info
.cs
.local_size
[2];
7026 unsigned local_workgroup_size
=
7027 src_shader
->info
.cs
.local_size
[0] * src_shader
->info
.cs
.local_size
[1] *
7028 src_shader
->info
.cs
.local_size
[2];
7030 unsigned min_dispatch_width
=
7031 DIV_ROUND_UP(local_workgroup_size
, compiler
->devinfo
->max_cs_threads
);
7032 min_dispatch_width
= MAX2(8, min_dispatch_width
);
7033 min_dispatch_width
= util_next_power_of_two(min_dispatch_width
);
7034 assert(min_dispatch_width
<= 32);
7036 fs_visitor
*v8
= NULL
, *v16
= NULL
, *v32
= NULL
;
7038 const char *fail_msg
= NULL
;
7039 unsigned promoted_constants
;
7041 /* Now the main event: Visit the shader IR and generate our CS IR for it.
7043 if (min_dispatch_width
<= 8) {
7044 nir_shader
*nir8
= compile_cs_to_nir(compiler
, mem_ctx
, key
,
7045 prog_data
, src_shader
, 8);
7046 v8
= new fs_visitor(compiler
, log_data
, mem_ctx
, key
, &prog_data
->base
,
7047 NULL
, /* Never used in core profile */
7048 nir8
, 8, shader_time_index
);
7049 if (!v8
->run_cs(min_dispatch_width
)) {
7050 fail_msg
= v8
->fail_msg
;
7052 /* We should always be able to do SIMD32 for compute shaders */
7053 assert(v8
->max_dispatch_width
>= 32);
7056 cs_set_simd_size(prog_data
, 8);
7057 cs_fill_push_const_info(compiler
->devinfo
, prog_data
);
7058 promoted_constants
= v8
->promoted_constants
;
7062 if (likely(!(INTEL_DEBUG
& DEBUG_NO16
)) &&
7063 !fail_msg
&& min_dispatch_width
<= 16) {
7064 /* Try a SIMD16 compile */
7065 nir_shader
*nir16
= compile_cs_to_nir(compiler
, mem_ctx
, key
,
7066 prog_data
, src_shader
, 16);
7067 v16
= new fs_visitor(compiler
, log_data
, mem_ctx
, key
, &prog_data
->base
,
7068 NULL
, /* Never used in core profile */
7069 nir16
, 16, shader_time_index
);
7071 v16
->import_uniforms(v8
);
7073 if (!v16
->run_cs(min_dispatch_width
)) {
7074 compiler
->shader_perf_log(log_data
,
7075 "SIMD16 shader failed to compile: %s",
7079 "Couldn't generate SIMD16 program and not "
7080 "enough threads for SIMD8";
7083 /* We should always be able to do SIMD32 for compute shaders */
7084 assert(v16
->max_dispatch_width
>= 32);
7087 cs_set_simd_size(prog_data
, 16);
7088 cs_fill_push_const_info(compiler
->devinfo
, prog_data
);
7089 promoted_constants
= v16
->promoted_constants
;
7093 /* We should always be able to do SIMD32 for compute shaders */
7094 assert(!v16
|| v16
->max_dispatch_width
>= 32);
7096 if (!fail_msg
&& (min_dispatch_width
> 16 || (INTEL_DEBUG
& DEBUG_DO32
))) {
7097 /* Try a SIMD32 compile */
7098 nir_shader
*nir32
= compile_cs_to_nir(compiler
, mem_ctx
, key
,
7099 prog_data
, src_shader
, 32);
7100 v32
= new fs_visitor(compiler
, log_data
, mem_ctx
, key
, &prog_data
->base
,
7101 NULL
, /* Never used in core profile */
7102 nir32
, 32, shader_time_index
);
7104 v32
->import_uniforms(v8
);
7106 v32
->import_uniforms(v16
);
7108 if (!v32
->run_cs(min_dispatch_width
)) {
7109 compiler
->shader_perf_log(log_data
,
7110 "SIMD32 shader failed to compile: %s",
7114 "Couldn't generate SIMD32 program and not "
7115 "enough threads for SIMD16";
7119 cs_set_simd_size(prog_data
, 32);
7120 cs_fill_push_const_info(compiler
->devinfo
, prog_data
);
7121 promoted_constants
= v32
->promoted_constants
;
7125 const unsigned *ret
= NULL
;
7126 if (unlikely(cfg
== NULL
)) {
7129 *error_str
= ralloc_strdup(mem_ctx
, fail_msg
);
7131 fs_generator
g(compiler
, log_data
, mem_ctx
, (void*) key
, &prog_data
->base
,
7132 promoted_constants
, false, MESA_SHADER_COMPUTE
);
7133 if (INTEL_DEBUG
& DEBUG_CS
) {
7134 char *name
= ralloc_asprintf(mem_ctx
, "%s compute shader %s",
7135 src_shader
->info
.label
?
7136 src_shader
->info
.label
: "unnamed",
7137 src_shader
->info
.name
);
7138 g
.enable_debug(name
);
7141 g
.generate_code(cfg
, prog_data
->simd_size
);
7143 ret
= g
.get_assembly(&prog_data
->base
.program_size
);
7154 * Test the dispatch mask packing assumptions of
7155 * brw_stage_has_packed_dispatch(). Call this from e.g. the top of
7156 * fs_visitor::emit_nir_code() to cause a GPU hang if any shader invocation is
7157 * executed with an unexpected dispatch mask.
7160 brw_fs_test_dispatch_packing(const fs_builder
&bld
)
7162 const gl_shader_stage stage
= bld
.shader
->stage
;
7164 if (brw_stage_has_packed_dispatch(bld
.shader
->devinfo
, stage
,
7165 bld
.shader
->stage_prog_data
)) {
7166 const fs_builder ubld
= bld
.exec_all().group(1, 0);
7167 const fs_reg tmp
= component(bld
.vgrf(BRW_REGISTER_TYPE_UD
), 0);
7168 const fs_reg mask
= (stage
== MESA_SHADER_FRAGMENT
? brw_vmask_reg() :
7171 ubld
.ADD(tmp
, mask
, brw_imm_ud(1));
7172 ubld
.AND(tmp
, mask
, tmp
);
7174 /* This will loop forever if the dispatch mask doesn't have the expected
7175 * form '2^n-1', in which case tmp will be non-zero.
7177 bld
.emit(BRW_OPCODE_DO
);
7178 bld
.CMP(bld
.null_reg_ud(), tmp
, brw_imm_ud(0), BRW_CONDITIONAL_NZ
);
7179 set_predicate(BRW_PREDICATE_NORMAL
, bld
.emit(BRW_OPCODE_WHILE
));