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"
32 #include "brw_context.h"
37 #include "brw_vec4_gs_visitor.h"
39 #include "brw_program.h"
40 #include "brw_dead_control_flow.h"
41 #include "compiler/glsl_types.h"
46 fs_inst::init(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
47 const fs_reg
*src
, unsigned sources
)
49 memset(this, 0, sizeof(*this));
51 this->src
= new fs_reg
[MAX2(sources
, 3)];
52 for (unsigned i
= 0; i
< sources
; i
++)
53 this->src
[i
] = src
[i
];
55 this->opcode
= opcode
;
57 this->sources
= sources
;
58 this->exec_size
= exec_size
;
60 assert(dst
.file
!= IMM
&& dst
.file
!= UNIFORM
);
62 assert(this->exec_size
!= 0);
64 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
66 /* This will be the case for almost all instructions. */
73 this->regs_written
= DIV_ROUND_UP(dst
.component_size(exec_size
),
77 this->regs_written
= 0;
81 unreachable("Invalid destination register file");
84 this->writes_accumulator
= false;
89 init(BRW_OPCODE_NOP
, 8, dst
, NULL
, 0);
92 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
)
94 init(opcode
, exec_size
, reg_undef
, NULL
, 0);
97 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
)
99 init(opcode
, exec_size
, dst
, NULL
, 0);
102 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
105 const fs_reg src
[1] = { src0
};
106 init(opcode
, exec_size
, dst
, src
, 1);
109 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
110 const fs_reg
&src0
, const fs_reg
&src1
)
112 const fs_reg src
[2] = { src0
, src1
};
113 init(opcode
, exec_size
, dst
, src
, 2);
116 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
117 const fs_reg
&src0
, const fs_reg
&src1
, const fs_reg
&src2
)
119 const fs_reg src
[3] = { src0
, src1
, src2
};
120 init(opcode
, exec_size
, dst
, src
, 3);
123 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_width
, const fs_reg
&dst
,
124 const fs_reg src
[], unsigned sources
)
126 init(opcode
, exec_width
, dst
, src
, sources
);
129 fs_inst::fs_inst(const fs_inst
&that
)
131 memcpy(this, &that
, sizeof(that
));
133 this->src
= new fs_reg
[MAX2(that
.sources
, 3)];
135 for (unsigned i
= 0; i
< that
.sources
; i
++)
136 this->src
[i
] = that
.src
[i
];
145 fs_inst::resize_sources(uint8_t num_sources
)
147 if (this->sources
!= num_sources
) {
148 fs_reg
*src
= new fs_reg
[MAX2(num_sources
, 3)];
150 for (unsigned i
= 0; i
< MIN2(this->sources
, num_sources
); ++i
)
151 src
[i
] = this->src
[i
];
155 this->sources
= num_sources
;
160 fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_builder
&bld
,
162 const fs_reg
&surf_index
,
163 const fs_reg
&varying_offset
,
164 uint32_t const_offset
)
166 /* We have our constant surface use a pitch of 4 bytes, so our index can
167 * be any component of a vector, and then we load 4 contiguous
168 * components starting from that.
170 * We break down the const_offset to a portion added to the variable
171 * offset and a portion done using reg_offset, which means that if you
172 * have GLSL using something like "uniform vec4 a[20]; gl_FragColor =
173 * a[i]", we'll temporarily generate 4 vec4 loads from offset i * 4, and
174 * CSE can later notice that those loads are all the same and eliminate
175 * the redundant ones.
177 fs_reg vec4_offset
= vgrf(glsl_type::uint_type
);
178 bld
.ADD(vec4_offset
, varying_offset
, brw_imm_ud(const_offset
& ~0xf));
181 if (devinfo
->gen
== 4 && bld
.dispatch_width() == 8) {
182 /* Pre-gen5, we can either use a SIMD8 message that requires (header,
183 * u, v, r) as parameters, or we can just use the SIMD16 message
184 * consisting of (header, u). We choose the second, at the cost of a
185 * longer return length.
191 if (devinfo
->gen
>= 7)
192 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
;
194 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
;
196 int regs_written
= 4 * (bld
.dispatch_width() / 8) * scale
;
197 fs_reg vec4_result
= fs_reg(VGRF
, alloc
.allocate(regs_written
), dst
.type
);
198 fs_inst
*inst
= bld
.emit(op
, vec4_result
, surf_index
, vec4_offset
);
199 inst
->regs_written
= regs_written
;
201 if (devinfo
->gen
< 7) {
202 inst
->base_mrf
= FIRST_PULL_LOAD_MRF(devinfo
->gen
);
203 inst
->header_size
= 1;
204 if (devinfo
->gen
== 4)
207 inst
->mlen
= 1 + bld
.dispatch_width() / 8;
210 bld
.MOV(dst
, offset(vec4_result
, bld
, ((const_offset
& 0xf) / 4) * scale
));
214 * A helper for MOV generation for fixing up broken hardware SEND dependency
218 fs_visitor::DEP_RESOLVE_MOV(const fs_builder
&bld
, int grf
)
220 /* The caller always wants uncompressed to emit the minimal extra
221 * dependencies, and to avoid having to deal with aligning its regs to 2.
223 const fs_builder ubld
= bld
.annotate("send dependency resolve")
226 ubld
.MOV(ubld
.null_reg_f(), fs_reg(VGRF
, grf
, BRW_REGISTER_TYPE_F
));
230 fs_inst::equals(fs_inst
*inst
) const
232 return (opcode
== inst
->opcode
&&
233 dst
.equals(inst
->dst
) &&
234 src
[0].equals(inst
->src
[0]) &&
235 src
[1].equals(inst
->src
[1]) &&
236 src
[2].equals(inst
->src
[2]) &&
237 saturate
== inst
->saturate
&&
238 predicate
== inst
->predicate
&&
239 conditional_mod
== inst
->conditional_mod
&&
240 mlen
== inst
->mlen
&&
241 base_mrf
== inst
->base_mrf
&&
242 target
== inst
->target
&&
244 header_size
== inst
->header_size
&&
245 shadow_compare
== inst
->shadow_compare
&&
246 exec_size
== inst
->exec_size
&&
247 offset
== inst
->offset
);
251 fs_inst::overwrites_reg(const fs_reg
®
) const
253 return reg
.in_range(dst
, regs_written
);
257 fs_inst::is_send_from_grf() const
260 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
261 case SHADER_OPCODE_SHADER_TIME_ADD
:
262 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
263 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
264 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
265 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
266 case SHADER_OPCODE_UNTYPED_ATOMIC
:
267 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
268 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
269 case SHADER_OPCODE_TYPED_ATOMIC
:
270 case SHADER_OPCODE_TYPED_SURFACE_READ
:
271 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
272 case SHADER_OPCODE_URB_WRITE_SIMD8
:
273 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
274 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
275 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
276 case SHADER_OPCODE_URB_READ_SIMD8
:
277 case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
:
279 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
280 return src
[1].file
== VGRF
;
281 case FS_OPCODE_FB_WRITE
:
282 return src
[0].file
== VGRF
;
285 return src
[0].file
== VGRF
;
292 * Returns true if this instruction's sources and destinations cannot
293 * safely be the same register.
295 * In most cases, a register can be written over safely by the same
296 * instruction that is its last use. For a single instruction, the
297 * sources are dereferenced before writing of the destination starts
300 * However, there are a few cases where this can be problematic:
302 * - Virtual opcodes that translate to multiple instructions in the
303 * code generator: if src == dst and one instruction writes the
304 * destination before a later instruction reads the source, then
305 * src will have been clobbered.
307 * - SIMD16 compressed instructions with certain regioning (see below).
309 * The register allocator uses this information to set up conflicts between
310 * GRF sources and the destination.
313 fs_inst::has_source_and_destination_hazard() const
316 case FS_OPCODE_PACK_HALF_2x16_SPLIT
:
317 /* Multiple partial writes to the destination */
320 /* The SIMD16 compressed instruction
322 * add(16) g4<1>F g4<8,8,1>F g6<8,8,1>F
324 * is actually decoded in hardware as:
326 * add(8) g4<1>F g4<8,8,1>F g6<8,8,1>F
327 * add(8) g5<1>F g5<8,8,1>F g7<8,8,1>F
329 * Which is safe. However, if we have uniform accesses
330 * happening, we get into trouble:
332 * add(8) g4<1>F g4<0,1,0>F g6<8,8,1>F
333 * add(8) g5<1>F g4<0,1,0>F g7<8,8,1>F
335 * Now our destination for the first instruction overwrote the
336 * second instruction's src0, and we get garbage for those 8
337 * pixels. There's a similar issue for the pre-gen6
338 * pixel_x/pixel_y, which are registers of 16-bit values and thus
339 * would get stomped by the first decode as well.
341 if (exec_size
== 16) {
342 for (int i
= 0; i
< sources
; i
++) {
343 if (src
[i
].file
== VGRF
&& (src
[i
].stride
== 0 ||
344 src
[i
].type
== BRW_REGISTER_TYPE_UW
||
345 src
[i
].type
== BRW_REGISTER_TYPE_W
||
346 src
[i
].type
== BRW_REGISTER_TYPE_UB
||
347 src
[i
].type
== BRW_REGISTER_TYPE_B
)) {
357 fs_inst::is_copy_payload(const brw::simple_allocator
&grf_alloc
) const
359 if (this->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
362 fs_reg reg
= this->src
[0];
363 if (reg
.file
!= VGRF
|| reg
.reg_offset
!= 0 || reg
.stride
== 0)
366 if (grf_alloc
.sizes
[reg
.nr
] != this->regs_written
)
369 for (int i
= 0; i
< this->sources
; i
++) {
370 reg
.type
= this->src
[i
].type
;
371 if (!this->src
[i
].equals(reg
))
374 if (i
< this->header_size
) {
377 reg
.reg_offset
+= this->exec_size
/ 8;
385 fs_inst::can_do_source_mods(const struct brw_device_info
*devinfo
)
387 if (devinfo
->gen
== 6 && is_math())
390 if (is_send_from_grf())
393 if (!backend_instruction::can_do_source_mods())
400 fs_inst::can_change_types() const
402 return dst
.type
== src
[0].type
&&
403 !src
[0].abs
&& !src
[0].negate
&& !saturate
&&
404 (opcode
== BRW_OPCODE_MOV
||
405 (opcode
== BRW_OPCODE_SEL
&&
406 dst
.type
== src
[1].type
&&
407 predicate
!= BRW_PREDICATE_NONE
&&
408 !src
[1].abs
&& !src
[1].negate
));
412 fs_inst::has_side_effects() const
414 return this->eot
|| backend_instruction::has_side_effects();
420 memset(this, 0, sizeof(*this));
424 /** Generic unset register constructor. */
428 this->file
= BAD_FILE
;
431 fs_reg::fs_reg(struct ::brw_reg reg
) :
434 this->reg_offset
= 0;
435 this->subreg_offset
= 0;
436 this->reladdr
= NULL
;
438 if (this->file
== IMM
&&
439 (this->type
!= BRW_REGISTER_TYPE_V
&&
440 this->type
!= BRW_REGISTER_TYPE_UV
&&
441 this->type
!= BRW_REGISTER_TYPE_VF
)) {
447 fs_reg::equals(const fs_reg
&r
) const
449 return (this->backend_reg::equals(r
) &&
450 subreg_offset
== r
.subreg_offset
&&
451 !reladdr
&& !r
.reladdr
&&
456 fs_reg::set_smear(unsigned subreg
)
458 assert(file
!= ARF
&& file
!= FIXED_GRF
&& file
!= IMM
);
459 subreg_offset
= subreg
* type_sz(type
);
465 fs_reg::is_contiguous() const
471 fs_reg::component_size(unsigned width
) const
473 const unsigned stride
= ((file
!= ARF
&& file
!= FIXED_GRF
) ? this->stride
:
476 return MAX2(width
* stride
, 1) * type_sz(type
);
480 type_size_scalar(const struct glsl_type
*type
)
482 unsigned int size
, i
;
484 switch (type
->base_type
) {
487 case GLSL_TYPE_FLOAT
:
489 return type
->components();
490 case GLSL_TYPE_ARRAY
:
491 return type_size_scalar(type
->fields
.array
) * type
->length
;
492 case GLSL_TYPE_STRUCT
:
494 for (i
= 0; i
< type
->length
; i
++) {
495 size
+= type_size_scalar(type
->fields
.structure
[i
].type
);
498 case GLSL_TYPE_SAMPLER
:
499 /* Samplers take up no register space, since they're baked in at
503 case GLSL_TYPE_ATOMIC_UINT
:
505 case GLSL_TYPE_SUBROUTINE
:
507 case GLSL_TYPE_IMAGE
:
508 return BRW_IMAGE_PARAM_SIZE
;
510 case GLSL_TYPE_ERROR
:
511 case GLSL_TYPE_INTERFACE
:
512 case GLSL_TYPE_DOUBLE
:
513 case GLSL_TYPE_FUNCTION
:
514 unreachable("not reached");
521 * Returns the number of scalar components needed to store type, assuming
522 * that vectors are padded out to vec4.
524 * This has the packing rules of type_size_vec4(), but counts components
525 * similar to type_size_scalar().
528 type_size_vec4_times_4(const struct glsl_type
*type
)
530 return 4 * type_size_vec4(type
);
534 * Create a MOV to read the timestamp register.
536 * The caller is responsible for emitting the MOV. The return value is
537 * the destination of the MOV, with extra parameters set.
540 fs_visitor::get_timestamp(const fs_builder
&bld
)
542 assert(devinfo
->gen
>= 7);
544 fs_reg ts
= fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE
,
547 BRW_REGISTER_TYPE_UD
));
549 fs_reg dst
= fs_reg(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
551 /* We want to read the 3 fields we care about even if it's not enabled in
554 bld
.group(4, 0).exec_all().MOV(dst
, ts
);
560 fs_visitor::emit_shader_time_begin()
562 shader_start_time
= get_timestamp(bld
.annotate("shader time start"));
564 /* We want only the low 32 bits of the timestamp. Since it's running
565 * at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,
566 * which is plenty of time for our purposes. It is identical across the
567 * EUs, but since it's tracking GPU core speed it will increment at a
568 * varying rate as render P-states change.
570 shader_start_time
.set_smear(0);
574 fs_visitor::emit_shader_time_end()
576 /* Insert our code just before the final SEND with EOT. */
577 exec_node
*end
= this->instructions
.get_tail();
578 assert(end
&& ((fs_inst
*) end
)->eot
);
579 const fs_builder ibld
= bld
.annotate("shader time end")
580 .exec_all().at(NULL
, end
);
582 fs_reg shader_end_time
= get_timestamp(ibld
);
584 /* We only use the low 32 bits of the timestamp - see
585 * emit_shader_time_begin()).
587 * We could also check if render P-states have changed (or anything
588 * else that might disrupt timing) by setting smear to 2 and checking if
589 * that field is != 0.
591 shader_end_time
.set_smear(0);
593 /* Check that there weren't any timestamp reset events (assuming these
594 * were the only two timestamp reads that happened).
596 fs_reg reset
= shader_end_time
;
598 set_condmod(BRW_CONDITIONAL_Z
,
599 ibld
.AND(ibld
.null_reg_ud(), reset
, brw_imm_ud(1u)));
600 ibld
.IF(BRW_PREDICATE_NORMAL
);
602 fs_reg start
= shader_start_time
;
604 fs_reg diff
= fs_reg(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
607 const fs_builder cbld
= ibld
.group(1, 0);
608 cbld
.group(1, 0).ADD(diff
, start
, shader_end_time
);
610 /* If there were no instructions between the two timestamp gets, the diff
611 * is 2 cycles. Remove that overhead, so I can forget about that when
612 * trying to determine the time taken for single instructions.
614 cbld
.ADD(diff
, diff
, brw_imm_ud(-2u));
615 SHADER_TIME_ADD(cbld
, 0, diff
);
616 SHADER_TIME_ADD(cbld
, 1, brw_imm_ud(1u));
617 ibld
.emit(BRW_OPCODE_ELSE
);
618 SHADER_TIME_ADD(cbld
, 2, brw_imm_ud(1u));
619 ibld
.emit(BRW_OPCODE_ENDIF
);
623 fs_visitor::SHADER_TIME_ADD(const fs_builder
&bld
,
624 int shader_time_subindex
,
627 int index
= shader_time_index
* 3 + shader_time_subindex
;
628 struct brw_reg offset
= brw_imm_d(index
* SHADER_TIME_STRIDE
);
631 if (dispatch_width
== 8)
632 payload
= vgrf(glsl_type::uvec2_type
);
634 payload
= vgrf(glsl_type::uint_type
);
636 bld
.emit(SHADER_OPCODE_SHADER_TIME_ADD
, fs_reg(), payload
, offset
, value
);
640 fs_visitor::vfail(const char *format
, va_list va
)
649 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
650 msg
= ralloc_asprintf(mem_ctx
, "%s compile failed: %s\n", stage_abbrev
, msg
);
652 this->fail_msg
= msg
;
655 fprintf(stderr
, "%s", msg
);
660 fs_visitor::fail(const char *format
, ...)
664 va_start(va
, format
);
670 * Mark this program as impossible to compile in SIMD16 mode.
672 * During the SIMD8 compile (which happens first), we can detect and flag
673 * things that are unsupported in SIMD16 mode, so the compiler can skip
674 * the SIMD16 compile altogether.
676 * During a SIMD16 compile (if one happens anyway), this just calls fail().
679 fs_visitor::no16(const char *msg
)
681 if (dispatch_width
== 16) {
684 simd16_unsupported
= true;
686 compiler
->shader_perf_log(log_data
,
687 "SIMD16 shader failed to compile: %s", msg
);
692 * Returns true if the instruction has a flag that means it won't
693 * update an entire destination register.
695 * For example, dead code elimination and live variable analysis want to know
696 * when a write to a variable screens off any preceding values that were in
700 fs_inst::is_partial_write() const
702 return ((this->predicate
&& this->opcode
!= BRW_OPCODE_SEL
) ||
703 (this->exec_size
* type_sz(this->dst
.type
)) < 32 ||
704 !this->dst
.is_contiguous());
708 fs_inst::components_read(unsigned i
) const
711 case FS_OPCODE_LINTERP
:
717 case FS_OPCODE_PIXEL_X
:
718 case FS_OPCODE_PIXEL_Y
:
722 case FS_OPCODE_FB_WRITE_LOGICAL
:
723 assert(src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].file
== IMM
);
724 /* First/second FB write color. */
726 return src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].ud
;
730 case SHADER_OPCODE_TEX_LOGICAL
:
731 case SHADER_OPCODE_TXD_LOGICAL
:
732 case SHADER_OPCODE_TXF_LOGICAL
:
733 case SHADER_OPCODE_TXL_LOGICAL
:
734 case SHADER_OPCODE_TXS_LOGICAL
:
735 case FS_OPCODE_TXB_LOGICAL
:
736 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
737 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
738 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
739 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
740 case SHADER_OPCODE_LOD_LOGICAL
:
741 case SHADER_OPCODE_TG4_LOGICAL
:
742 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
743 assert(src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].file
== IMM
&&
744 src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].file
== IMM
);
745 /* Texture coordinates. */
746 if (i
== TEX_LOGICAL_SRC_COORDINATE
)
747 return src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].ud
;
748 /* Texture derivatives. */
749 else if ((i
== TEX_LOGICAL_SRC_LOD
|| i
== TEX_LOGICAL_SRC_LOD2
) &&
750 opcode
== SHADER_OPCODE_TXD_LOGICAL
)
751 return src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].ud
;
752 /* Texture offset. */
753 else if (i
== TEX_LOGICAL_SRC_OFFSET_VALUE
)
756 else if (i
== TEX_LOGICAL_SRC_MCS
&& opcode
== SHADER_OPCODE_TXF_CMS_W_LOGICAL
)
761 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
762 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
763 assert(src
[3].file
== IMM
);
764 /* Surface coordinates. */
767 /* Surface operation source (ignored for reads). */
773 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
774 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
775 assert(src
[3].file
== IMM
&&
777 /* Surface coordinates. */
780 /* Surface operation source. */
786 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
787 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
: {
788 assert(src
[3].file
== IMM
&&
790 const unsigned op
= src
[4].ud
;
791 /* Surface coordinates. */
794 /* Surface operation source. */
795 else if (i
== 1 && op
== BRW_AOP_CMPWR
)
797 else if (i
== 1 && (op
== BRW_AOP_INC
|| op
== BRW_AOP_DEC
||
798 op
== BRW_AOP_PREDEC
))
810 fs_inst::regs_read(int arg
) const
813 case FS_OPCODE_FB_WRITE
:
814 case SHADER_OPCODE_URB_WRITE_SIMD8
:
815 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
816 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
817 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
818 case SHADER_OPCODE_URB_READ_SIMD8
:
819 case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
:
820 case SHADER_OPCODE_UNTYPED_ATOMIC
:
821 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
822 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
823 case SHADER_OPCODE_TYPED_ATOMIC
:
824 case SHADER_OPCODE_TYPED_SURFACE_READ
:
825 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
826 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
831 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
:
832 /* The payload is actually stored in src1 */
837 case FS_OPCODE_LINTERP
:
842 case SHADER_OPCODE_LOAD_PAYLOAD
:
843 if (arg
< this->header_size
)
847 case CS_OPCODE_CS_TERMINATE
:
848 case SHADER_OPCODE_BARRIER
:
851 case SHADER_OPCODE_MOV_INDIRECT
:
853 assert(src
[2].file
== IMM
);
854 unsigned region_length
= src
[2].ud
;
856 if (src
[0].file
== UNIFORM
) {
857 assert(region_length
% 4 == 0);
858 return region_length
/ 4;
859 } else if (src
[0].file
== FIXED_GRF
) {
860 /* If the start of the region is not register aligned, then
861 * there's some portion of the register that's technically
862 * unread at the beginning.
864 * However, the register allocator works in terms of whole
865 * registers, and does not use subnr. It assumes that the
866 * read starts at the beginning of the register, and extends
867 * regs_read() whole registers beyond that.
869 * To compensate, we extend the region length to include this
870 * unread portion at the beginning.
873 region_length
+= src
[0].subnr
;
875 return DIV_ROUND_UP(region_length
, REG_SIZE
);
877 assert(!"Invalid register file");
883 if (is_tex() && arg
== 0 && src
[0].file
== VGRF
)
888 switch (src
[arg
].file
) {
898 return DIV_ROUND_UP(components_read(arg
) *
899 src
[arg
].component_size(exec_size
),
902 unreachable("MRF registers are not allowed as sources");
908 fs_inst::reads_flag() const
914 fs_inst::writes_flag() const
916 return (conditional_mod
&& (opcode
!= BRW_OPCODE_SEL
&&
917 opcode
!= BRW_OPCODE_IF
&&
918 opcode
!= BRW_OPCODE_WHILE
)) ||
919 opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
;
923 * Returns how many MRFs an FS opcode will write over.
925 * Note that this is not the 0 or 1 implied writes in an actual gen
926 * instruction -- the FS opcodes often generate MOVs in addition.
929 fs_visitor::implied_mrf_writes(fs_inst
*inst
)
934 if (inst
->base_mrf
== -1)
937 switch (inst
->opcode
) {
938 case SHADER_OPCODE_RCP
:
939 case SHADER_OPCODE_RSQ
:
940 case SHADER_OPCODE_SQRT
:
941 case SHADER_OPCODE_EXP2
:
942 case SHADER_OPCODE_LOG2
:
943 case SHADER_OPCODE_SIN
:
944 case SHADER_OPCODE_COS
:
945 return 1 * dispatch_width
/ 8;
946 case SHADER_OPCODE_POW
:
947 case SHADER_OPCODE_INT_QUOTIENT
:
948 case SHADER_OPCODE_INT_REMAINDER
:
949 return 2 * dispatch_width
/ 8;
950 case SHADER_OPCODE_TEX
:
952 case SHADER_OPCODE_TXD
:
953 case SHADER_OPCODE_TXF
:
954 case SHADER_OPCODE_TXF_CMS
:
955 case SHADER_OPCODE_TXF_CMS_W
:
956 case SHADER_OPCODE_TXF_MCS
:
957 case SHADER_OPCODE_TG4
:
958 case SHADER_OPCODE_TG4_OFFSET
:
959 case SHADER_OPCODE_TXL
:
960 case SHADER_OPCODE_TXS
:
961 case SHADER_OPCODE_LOD
:
962 case SHADER_OPCODE_SAMPLEINFO
:
964 case FS_OPCODE_FB_WRITE
:
966 case FS_OPCODE_GET_BUFFER_SIZE
:
967 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
968 case SHADER_OPCODE_GEN4_SCRATCH_READ
:
970 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
:
972 case SHADER_OPCODE_GEN4_SCRATCH_WRITE
:
974 case SHADER_OPCODE_UNTYPED_ATOMIC
:
975 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
976 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
977 case SHADER_OPCODE_TYPED_ATOMIC
:
978 case SHADER_OPCODE_TYPED_SURFACE_READ
:
979 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
980 case SHADER_OPCODE_URB_WRITE_SIMD8
:
981 case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
982 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
:
983 case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
984 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
985 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
986 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
987 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
990 unreachable("not reached");
995 fs_visitor::vgrf(const glsl_type
*const type
)
997 int reg_width
= dispatch_width
/ 8;
998 return fs_reg(VGRF
, alloc
.allocate(type_size_scalar(type
) * reg_width
),
999 brw_type_for_base_type(type
));
1002 fs_reg::fs_reg(enum brw_reg_file file
, int nr
)
1007 this->type
= BRW_REGISTER_TYPE_F
;
1008 this->stride
= (file
== UNIFORM
? 0 : 1);
1011 fs_reg::fs_reg(enum brw_reg_file file
, int nr
, enum brw_reg_type type
)
1017 this->stride
= (file
== UNIFORM
? 0 : 1);
1020 /* For SIMD16, we need to follow from the uniform setup of SIMD8 dispatch.
1021 * This brings in those uniform definitions
1024 fs_visitor::import_uniforms(fs_visitor
*v
)
1026 this->push_constant_loc
= v
->push_constant_loc
;
1027 this->pull_constant_loc
= v
->pull_constant_loc
;
1028 this->uniforms
= v
->uniforms
;
1029 this->param_size
= v
->param_size
;
1033 fs_visitor::emit_fragcoord_interpolation(bool pixel_center_integer
,
1034 bool origin_upper_left
)
1036 assert(stage
== MESA_SHADER_FRAGMENT
);
1037 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1038 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec4_type
));
1040 bool flip
= !origin_upper_left
^ key
->render_to_fbo
;
1042 /* gl_FragCoord.x */
1043 if (pixel_center_integer
) {
1044 bld
.MOV(wpos
, this->pixel_x
);
1046 bld
.ADD(wpos
, this->pixel_x
, brw_imm_f(0.5f
));
1048 wpos
= offset(wpos
, bld
, 1);
1050 /* gl_FragCoord.y */
1051 if (!flip
&& pixel_center_integer
) {
1052 bld
.MOV(wpos
, this->pixel_y
);
1054 fs_reg pixel_y
= this->pixel_y
;
1055 float offset
= (pixel_center_integer
? 0.0f
: 0.5f
);
1058 pixel_y
.negate
= true;
1059 offset
+= key
->drawable_height
- 1.0f
;
1062 bld
.ADD(wpos
, pixel_y
, brw_imm_f(offset
));
1064 wpos
= offset(wpos
, bld
, 1);
1066 /* gl_FragCoord.z */
1067 if (devinfo
->gen
>= 6) {
1068 bld
.MOV(wpos
, fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0)));
1070 bld
.emit(FS_OPCODE_LINTERP
, wpos
,
1071 this->delta_xy
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
1072 interp_reg(VARYING_SLOT_POS
, 2));
1074 wpos
= offset(wpos
, bld
, 1);
1076 /* gl_FragCoord.w: Already set up in emit_interpolation */
1077 bld
.MOV(wpos
, this->wpos_w
);
1083 fs_visitor::emit_linterp(const fs_reg
&attr
, const fs_reg
&interp
,
1084 glsl_interp_qualifier interpolation_mode
,
1085 bool is_centroid
, bool is_sample
)
1087 brw_wm_barycentric_interp_mode barycoord_mode
;
1088 if (devinfo
->gen
>= 6) {
1090 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1091 barycoord_mode
= BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC
;
1093 barycoord_mode
= BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC
;
1094 } else if (is_sample
) {
1095 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1096 barycoord_mode
= BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC
;
1098 barycoord_mode
= BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC
;
1100 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1101 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1103 barycoord_mode
= BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC
;
1106 /* On Ironlake and below, there is only one interpolation mode.
1107 * Centroid interpolation doesn't mean anything on this hardware --
1108 * there is no multisampling.
1110 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1112 return bld
.emit(FS_OPCODE_LINTERP
, attr
,
1113 this->delta_xy
[barycoord_mode
], interp
);
1117 fs_visitor::emit_general_interpolation(fs_reg
*attr
, const char *name
,
1118 const glsl_type
*type
,
1119 glsl_interp_qualifier interpolation_mode
,
1120 int *location
, bool mod_centroid
,
1123 assert(stage
== MESA_SHADER_FRAGMENT
);
1124 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1125 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1127 if (interpolation_mode
== INTERP_QUALIFIER_NONE
) {
1129 *location
== VARYING_SLOT_COL0
|| *location
== VARYING_SLOT_COL1
;
1130 if (key
->flat_shade
&& is_gl_Color
) {
1131 interpolation_mode
= INTERP_QUALIFIER_FLAT
;
1133 interpolation_mode
= INTERP_QUALIFIER_SMOOTH
;
1137 if (type
->is_array() || type
->is_matrix()) {
1138 const glsl_type
*elem_type
= glsl_get_array_element(type
);
1139 const unsigned length
= glsl_get_length(type
);
1141 for (unsigned i
= 0; i
< length
; i
++) {
1142 emit_general_interpolation(attr
, name
, elem_type
, interpolation_mode
,
1143 location
, mod_centroid
, mod_sample
);
1145 } else if (type
->is_record()) {
1146 for (unsigned i
= 0; i
< type
->length
; i
++) {
1147 const glsl_type
*field_type
= type
->fields
.structure
[i
].type
;
1148 emit_general_interpolation(attr
, name
, field_type
, interpolation_mode
,
1149 location
, mod_centroid
, mod_sample
);
1152 assert(type
->is_scalar() || type
->is_vector());
1154 if (prog_data
->urb_setup
[*location
] == -1) {
1155 /* If there's no incoming setup data for this slot, don't
1156 * emit interpolation for it.
1158 *attr
= offset(*attr
, bld
, type
->vector_elements
);
1163 attr
->type
= brw_type_for_base_type(type
->get_scalar_type());
1165 if (interpolation_mode
== INTERP_QUALIFIER_FLAT
) {
1166 /* Constant interpolation (flat shading) case. The SF has
1167 * handed us defined values in only the constant offset
1168 * field of the setup reg.
1170 for (unsigned int i
= 0; i
< type
->vector_elements
; i
++) {
1171 struct brw_reg interp
= interp_reg(*location
, i
);
1172 interp
= suboffset(interp
, 3);
1173 interp
.type
= attr
->type
;
1174 bld
.emit(FS_OPCODE_CINTERP
, *attr
, fs_reg(interp
));
1175 *attr
= offset(*attr
, bld
, 1);
1178 /* Smooth/noperspective interpolation case. */
1179 for (unsigned int i
= 0; i
< type
->vector_elements
; i
++) {
1180 struct brw_reg interp
= interp_reg(*location
, i
);
1181 if (devinfo
->needs_unlit_centroid_workaround
&& mod_centroid
) {
1182 /* Get the pixel/sample mask into f0 so that we know
1183 * which pixels are lit. Then, for each channel that is
1184 * unlit, replace the centroid data with non-centroid
1187 bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
1190 inst
= emit_linterp(*attr
, fs_reg(interp
), interpolation_mode
,
1192 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1193 inst
->predicate_inverse
= true;
1194 if (devinfo
->has_pln
)
1195 inst
->no_dd_clear
= true;
1197 inst
= emit_linterp(*attr
, fs_reg(interp
), interpolation_mode
,
1198 mod_centroid
&& !key
->persample_shading
,
1199 mod_sample
|| key
->persample_shading
);
1200 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1201 inst
->predicate_inverse
= false;
1202 if (devinfo
->has_pln
)
1203 inst
->no_dd_check
= true;
1206 emit_linterp(*attr
, fs_reg(interp
), interpolation_mode
,
1207 mod_centroid
&& !key
->persample_shading
,
1208 mod_sample
|| key
->persample_shading
);
1210 if (devinfo
->gen
< 6 && interpolation_mode
== INTERP_QUALIFIER_SMOOTH
) {
1211 bld
.MUL(*attr
, *attr
, this->pixel_w
);
1213 *attr
= offset(*attr
, bld
, 1);
1221 fs_visitor::emit_frontfacing_interpolation()
1223 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::bool_type
));
1225 if (devinfo
->gen
>= 6) {
1226 /* Bit 15 of g0.0 is 0 if the polygon is front facing. We want to create
1227 * a boolean result from this (~0/true or 0/false).
1229 * We can use the fact that bit 15 is the MSB of g0.0:W to accomplish
1230 * this task in only one instruction:
1231 * - a negation source modifier will flip the bit; and
1232 * - a W -> D type conversion will sign extend the bit into the high
1233 * word of the destination.
1235 * An ASR 15 fills the low word of the destination.
1237 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
1240 bld
.ASR(*reg
, g0
, brw_imm_d(15));
1242 /* Bit 31 of g1.6 is 0 if the polygon is front facing. We want to create
1243 * a boolean result from this (1/true or 0/false).
1245 * Like in the above case, since the bit is the MSB of g1.6:UD we can use
1246 * the negation source modifier to flip it. Unfortunately the SHR
1247 * instruction only operates on UD (or D with an abs source modifier)
1248 * sources without negation.
1250 * Instead, use ASR (which will give ~0/true or 0/false).
1252 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
1255 bld
.ASR(*reg
, g1_6
, brw_imm_d(31));
1262 fs_visitor::compute_sample_position(fs_reg dst
, fs_reg int_sample_pos
)
1264 assert(stage
== MESA_SHADER_FRAGMENT
);
1265 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1266 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
1268 if (key
->compute_pos_offset
) {
1269 /* Convert int_sample_pos to floating point */
1270 bld
.MOV(dst
, int_sample_pos
);
1271 /* Scale to the range [0, 1] */
1272 bld
.MUL(dst
, dst
, brw_imm_f(1 / 16.0f
));
1275 /* From ARB_sample_shading specification:
1276 * "When rendering to a non-multisample buffer, or if multisample
1277 * rasterization is disabled, gl_SamplePosition will always be
1280 bld
.MOV(dst
, brw_imm_f(0.5f
));
1285 fs_visitor::emit_samplepos_setup()
1287 assert(devinfo
->gen
>= 6);
1289 const fs_builder abld
= bld
.annotate("compute sample position");
1290 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec2_type
));
1292 fs_reg int_sample_x
= vgrf(glsl_type::int_type
);
1293 fs_reg int_sample_y
= vgrf(glsl_type::int_type
);
1295 /* WM will be run in MSDISPMODE_PERSAMPLE. So, only one of SIMD8 or SIMD16
1296 * mode will be enabled.
1298 * From the Ivy Bridge PRM, volume 2 part 1, page 344:
1299 * R31.1:0 Position Offset X/Y for Slot[3:0]
1300 * R31.3:2 Position Offset X/Y for Slot[7:4]
1303 * The X, Y sample positions come in as bytes in thread payload. So, read
1304 * the positions using vstride=16, width=8, hstride=2.
1306 struct brw_reg sample_pos_reg
=
1307 stride(retype(brw_vec1_grf(payload
.sample_pos_reg
, 0),
1308 BRW_REGISTER_TYPE_B
), 16, 8, 2);
1310 if (dispatch_width
== 8) {
1311 abld
.MOV(int_sample_x
, fs_reg(sample_pos_reg
));
1313 abld
.half(0).MOV(half(int_sample_x
, 0), fs_reg(sample_pos_reg
));
1314 abld
.half(1).MOV(half(int_sample_x
, 1),
1315 fs_reg(suboffset(sample_pos_reg
, 16)));
1317 /* Compute gl_SamplePosition.x */
1318 compute_sample_position(pos
, int_sample_x
);
1319 pos
= offset(pos
, abld
, 1);
1320 if (dispatch_width
== 8) {
1321 abld
.MOV(int_sample_y
, fs_reg(suboffset(sample_pos_reg
, 1)));
1323 abld
.half(0).MOV(half(int_sample_y
, 0),
1324 fs_reg(suboffset(sample_pos_reg
, 1)));
1325 abld
.half(1).MOV(half(int_sample_y
, 1),
1326 fs_reg(suboffset(sample_pos_reg
, 17)));
1328 /* Compute gl_SamplePosition.y */
1329 compute_sample_position(pos
, int_sample_y
);
1334 fs_visitor::emit_sampleid_setup()
1336 assert(stage
== MESA_SHADER_FRAGMENT
);
1337 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1338 assert(devinfo
->gen
>= 6);
1340 const fs_builder abld
= bld
.annotate("compute sample id");
1341 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::int_type
));
1343 if (key
->compute_sample_id
) {
1344 fs_reg
t1(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_D
);
1346 fs_reg
t2(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_W
);
1348 /* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
1349 * 8x multisampling, subspan 0 will represent sample N (where N
1350 * is 0, 2, 4 or 6), subspan 1 will represent sample 1, 3, 5 or
1351 * 7. We can find the value of N by looking at R0.0 bits 7:6
1352 * ("Starting Sample Pair Index (SSPI)") and multiplying by two
1353 * (since samples are always delivered in pairs). That is, we
1354 * compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 & 0xc0) >> 5. Then
1355 * we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1) in
1356 * case of SIMD8 and sequence (0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
1357 * 2, 3, 3, 3, 3) in case of SIMD16. We compute this sequence by
1358 * populating a temporary variable with the sequence (0, 1, 2, 3),
1359 * and then reading from it using vstride=1, width=4, hstride=0.
1360 * These computations hold good for 4x multisampling as well.
1362 * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1):
1363 * the first four slots are sample 0 of subspan 0; the next four
1364 * are sample 1 of subspan 0; the third group is sample 0 of
1365 * subspan 1, and finally sample 1 of subspan 1.
1368 /* SKL+ has an extra bit for the Starting Sample Pair Index to
1369 * accomodate 16x MSAA.
1371 unsigned sspi_mask
= devinfo
->gen
>= 9 ? 0x1c0 : 0xc0;
1373 abld
.exec_all().group(1, 0)
1374 .AND(t1
, fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_D
)),
1375 brw_imm_ud(sspi_mask
));
1376 abld
.exec_all().group(1, 0).SHR(t1
, t1
, brw_imm_d(5));
1378 /* This works for both SIMD8 and SIMD16 */
1379 abld
.exec_all().group(4, 0)
1380 .MOV(t2
, brw_imm_v(key
->persample_2x
? 0x1010 : 0x3210));
1382 /* This special instruction takes care of setting vstride=1,
1383 * width=4, hstride=0 of t2 during an ADD instruction.
1385 abld
.emit(FS_OPCODE_SET_SAMPLE_ID
, *reg
, t1
, t2
);
1387 /* As per GL_ARB_sample_shading specification:
1388 * "When rendering to a non-multisample buffer, or if multisample
1389 * rasterization is disabled, gl_SampleID will always be zero."
1391 abld
.MOV(*reg
, brw_imm_d(0));
1398 fs_visitor::resolve_source_modifiers(const fs_reg
&src
)
1400 if (!src
.abs
&& !src
.negate
)
1403 fs_reg temp
= bld
.vgrf(src
.type
);
1410 fs_visitor::emit_discard_jump()
1412 assert(((brw_wm_prog_data
*) this->prog_data
)->uses_kill
);
1414 /* For performance, after a discard, jump to the end of the
1415 * shader if all relevant channels have been discarded.
1417 fs_inst
*discard_jump
= bld
.emit(FS_OPCODE_DISCARD_JUMP
);
1418 discard_jump
->flag_subreg
= 1;
1420 discard_jump
->predicate
= (dispatch_width
== 8)
1421 ? BRW_PREDICATE_ALIGN1_ANY8H
1422 : BRW_PREDICATE_ALIGN1_ANY16H
;
1423 discard_jump
->predicate_inverse
= true;
1427 fs_visitor::emit_gs_thread_end()
1429 assert(stage
== MESA_SHADER_GEOMETRY
);
1431 struct brw_gs_prog_data
*gs_prog_data
=
1432 (struct brw_gs_prog_data
*) prog_data
;
1434 if (gs_compile
->control_data_header_size_bits
> 0) {
1435 emit_gs_control_data_bits(this->final_gs_vertex_count
);
1438 const fs_builder abld
= bld
.annotate("thread end");
1441 if (gs_prog_data
->static_vertex_count
!= -1) {
1442 foreach_in_list_reverse(fs_inst
, prev
, &this->instructions
) {
1443 if (prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8
||
1444 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
||
1445 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
||
1446 prev
->opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
) {
1449 /* Delete now dead instructions. */
1450 foreach_in_list_reverse_safe(exec_node
, dead
, &this->instructions
) {
1456 } else if (prev
->is_control_flow() || prev
->has_side_effects()) {
1460 fs_reg hdr
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1461 abld
.MOV(hdr
, fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
)));
1462 inst
= abld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8
, reg_undef
, hdr
);
1465 fs_reg payload
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
1466 fs_reg
*sources
= ralloc_array(mem_ctx
, fs_reg
, 2);
1467 sources
[0] = fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
));
1468 sources
[1] = this->final_gs_vertex_count
;
1469 abld
.LOAD_PAYLOAD(payload
, sources
, 2, 2);
1470 inst
= abld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8
, reg_undef
, payload
);
1478 fs_visitor::assign_curb_setup()
1480 if (dispatch_width
== 8) {
1481 prog_data
->dispatch_grf_start_reg
= payload
.num_regs
;
1483 if (stage
== MESA_SHADER_FRAGMENT
) {
1484 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1485 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1486 } else if (stage
== MESA_SHADER_COMPUTE
) {
1487 brw_cs_prog_data
*prog_data
= (brw_cs_prog_data
*) this->prog_data
;
1488 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1490 unreachable("Unsupported shader type!");
1494 prog_data
->curb_read_length
= ALIGN(stage_prog_data
->nr_params
, 8) / 8;
1496 /* Map the offsets in the UNIFORM file to fixed HW regs. */
1497 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1498 for (unsigned int i
= 0; i
< inst
->sources
; i
++) {
1499 if (inst
->src
[i
].file
== UNIFORM
) {
1500 int uniform_nr
= inst
->src
[i
].nr
+ inst
->src
[i
].reg_offset
;
1502 if (uniform_nr
>= 0 && uniform_nr
< (int) uniforms
) {
1503 constant_nr
= push_constant_loc
[uniform_nr
];
1505 /* Section 5.11 of the OpenGL 4.1 spec says:
1506 * "Out-of-bounds reads return undefined values, which include
1507 * values from other variables of the active program or zero."
1508 * Just return the first push constant.
1513 struct brw_reg brw_reg
= brw_vec1_grf(payload
.num_regs
+
1516 brw_reg
.abs
= inst
->src
[i
].abs
;
1517 brw_reg
.negate
= inst
->src
[i
].negate
;
1519 assert(inst
->src
[i
].stride
== 0);
1520 inst
->src
[i
] = byte_offset(
1521 retype(brw_reg
, inst
->src
[i
].type
),
1522 inst
->src
[i
].subreg_offset
);
1527 /* This may be updated in assign_urb_setup or assign_vs_urb_setup. */
1528 this->first_non_payload_grf
= payload
.num_regs
+ prog_data
->curb_read_length
;
1532 fs_visitor::calculate_urb_setup()
1534 assert(stage
== MESA_SHADER_FRAGMENT
);
1535 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1536 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1538 memset(prog_data
->urb_setup
, -1,
1539 sizeof(prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
1542 /* Figure out where each of the incoming setup attributes lands. */
1543 if (devinfo
->gen
>= 6) {
1544 if (_mesa_bitcount_64(nir
->info
.inputs_read
&
1545 BRW_FS_VARYING_INPUT_MASK
) <= 16) {
1546 /* The SF/SBE pipeline stage can do arbitrary rearrangement of the
1547 * first 16 varying inputs, so we can put them wherever we want.
1548 * Just put them in order.
1550 * This is useful because it means that (a) inputs not used by the
1551 * fragment shader won't take up valuable register space, and (b) we
1552 * won't have to recompile the fragment shader if it gets paired with
1553 * a different vertex (or geometry) shader.
1555 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1556 if (nir
->info
.inputs_read
& BRW_FS_VARYING_INPUT_MASK
&
1557 BITFIELD64_BIT(i
)) {
1558 prog_data
->urb_setup
[i
] = urb_next
++;
1562 bool include_vue_header
=
1563 nir
->info
.inputs_read
& (VARYING_BIT_LAYER
| VARYING_BIT_VIEWPORT
);
1565 /* We have enough input varyings that the SF/SBE pipeline stage can't
1566 * arbitrarily rearrange them to suit our whim; we have to put them
1567 * in an order that matches the output of the previous pipeline stage
1568 * (geometry or vertex shader).
1570 struct brw_vue_map prev_stage_vue_map
;
1571 brw_compute_vue_map(devinfo
, &prev_stage_vue_map
,
1572 key
->input_slots_valid
,
1573 nir
->info
.separate_shader
);
1575 include_vue_header
? 0 : 2 * BRW_SF_URB_ENTRY_READ_OFFSET
;
1577 assert(prev_stage_vue_map
.num_slots
<= first_slot
+ 32);
1578 for (int slot
= first_slot
; slot
< prev_stage_vue_map
.num_slots
;
1580 int varying
= prev_stage_vue_map
.slot_to_varying
[slot
];
1581 if (varying
!= BRW_VARYING_SLOT_PAD
&&
1582 (nir
->info
.inputs_read
& BRW_FS_VARYING_INPUT_MASK
&
1583 BITFIELD64_BIT(varying
))) {
1584 prog_data
->urb_setup
[varying
] = slot
- first_slot
;
1587 urb_next
= prev_stage_vue_map
.num_slots
- first_slot
;
1590 /* FINISHME: The sf doesn't map VS->FS inputs for us very well. */
1591 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1592 /* Point size is packed into the header, not as a general attribute */
1593 if (i
== VARYING_SLOT_PSIZ
)
1596 if (key
->input_slots_valid
& BITFIELD64_BIT(i
)) {
1597 /* The back color slot is skipped when the front color is
1598 * also written to. In addition, some slots can be
1599 * written in the vertex shader and not read in the
1600 * fragment shader. So the register number must always be
1601 * incremented, mapped or not.
1603 if (_mesa_varying_slot_in_fs((gl_varying_slot
) i
))
1604 prog_data
->urb_setup
[i
] = urb_next
;
1610 * It's a FS only attribute, and we did interpolation for this attribute
1611 * in SF thread. So, count it here, too.
1613 * See compile_sf_prog() for more info.
1615 if (nir
->info
.inputs_read
& BITFIELD64_BIT(VARYING_SLOT_PNTC
))
1616 prog_data
->urb_setup
[VARYING_SLOT_PNTC
] = urb_next
++;
1619 prog_data
->num_varying_inputs
= urb_next
;
1623 fs_visitor::assign_urb_setup()
1625 assert(stage
== MESA_SHADER_FRAGMENT
);
1626 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1628 int urb_start
= payload
.num_regs
+ prog_data
->base
.curb_read_length
;
1630 /* Offset all the urb_setup[] index by the actual position of the
1631 * setup regs, now that the location of the constants has been chosen.
1633 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1634 if (inst
->opcode
== FS_OPCODE_LINTERP
) {
1635 assert(inst
->src
[1].file
== FIXED_GRF
);
1636 inst
->src
[1].nr
+= urb_start
;
1639 if (inst
->opcode
== FS_OPCODE_CINTERP
) {
1640 assert(inst
->src
[0].file
== FIXED_GRF
);
1641 inst
->src
[0].nr
+= urb_start
;
1645 /* Each attribute is 4 setup channels, each of which is half a reg. */
1646 this->first_non_payload_grf
+= prog_data
->num_varying_inputs
* 2;
1650 fs_visitor::convert_attr_sources_to_hw_regs(fs_inst
*inst
)
1652 for (int i
= 0; i
< inst
->sources
; i
++) {
1653 if (inst
->src
[i
].file
== ATTR
) {
1654 int grf
= payload
.num_regs
+
1655 prog_data
->curb_read_length
+
1657 inst
->src
[i
].reg_offset
;
1659 unsigned width
= inst
->src
[i
].stride
== 0 ? 1 : inst
->exec_size
;
1660 struct brw_reg reg
=
1661 stride(byte_offset(retype(brw_vec8_grf(grf
, 0), inst
->src
[i
].type
),
1662 inst
->src
[i
].subreg_offset
),
1663 inst
->exec_size
* inst
->src
[i
].stride
,
1664 width
, inst
->src
[i
].stride
);
1665 reg
.abs
= inst
->src
[i
].abs
;
1666 reg
.negate
= inst
->src
[i
].negate
;
1674 fs_visitor::assign_vs_urb_setup()
1676 brw_vs_prog_data
*vs_prog_data
= (brw_vs_prog_data
*) prog_data
;
1678 assert(stage
== MESA_SHADER_VERTEX
);
1680 /* Each attribute is 4 regs. */
1681 this->first_non_payload_grf
+= 4 * vs_prog_data
->nr_attributes
;
1683 assert(vs_prog_data
->base
.urb_read_length
<= 15);
1685 /* Rewrite all ATTR file references to the hw grf that they land in. */
1686 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1687 convert_attr_sources_to_hw_regs(inst
);
1692 fs_visitor::assign_tes_urb_setup()
1694 assert(stage
== MESA_SHADER_TESS_EVAL
);
1696 brw_vue_prog_data
*vue_prog_data
= (brw_vue_prog_data
*) prog_data
;
1698 first_non_payload_grf
+= 8 * vue_prog_data
->urb_read_length
;
1700 /* Rewrite all ATTR file references to HW_REGs. */
1701 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1702 convert_attr_sources_to_hw_regs(inst
);
1707 fs_visitor::assign_gs_urb_setup()
1709 assert(stage
== MESA_SHADER_GEOMETRY
);
1711 brw_vue_prog_data
*vue_prog_data
= (brw_vue_prog_data
*) prog_data
;
1713 first_non_payload_grf
+=
1714 8 * vue_prog_data
->urb_read_length
* nir
->info
.gs
.vertices_in
;
1716 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1717 /* Rewrite all ATTR file references to GRFs. */
1718 convert_attr_sources_to_hw_regs(inst
);
1724 * Split large virtual GRFs into separate components if we can.
1726 * This is mostly duplicated with what brw_fs_vector_splitting does,
1727 * but that's really conservative because it's afraid of doing
1728 * splitting that doesn't result in real progress after the rest of
1729 * the optimization phases, which would cause infinite looping in
1730 * optimization. We can do it once here, safely. This also has the
1731 * opportunity to split interpolated values, or maybe even uniforms,
1732 * which we don't have at the IR level.
1734 * We want to split, because virtual GRFs are what we register
1735 * allocate and spill (due to contiguousness requirements for some
1736 * instructions), and they're what we naturally generate in the
1737 * codegen process, but most virtual GRFs don't actually need to be
1738 * contiguous sets of GRFs. If we split, we'll end up with reduced
1739 * live intervals and better dead code elimination and coalescing.
1742 fs_visitor::split_virtual_grfs()
1744 int num_vars
= this->alloc
.count
;
1746 /* Count the total number of registers */
1748 int vgrf_to_reg
[num_vars
];
1749 for (int i
= 0; i
< num_vars
; i
++) {
1750 vgrf_to_reg
[i
] = reg_count
;
1751 reg_count
+= alloc
.sizes
[i
];
1754 /* An array of "split points". For each register slot, this indicates
1755 * if this slot can be separated from the previous slot. Every time an
1756 * instruction uses multiple elements of a register (as a source or
1757 * destination), we mark the used slots as inseparable. Then we go
1758 * through and split the registers into the smallest pieces we can.
1760 bool split_points
[reg_count
];
1761 memset(split_points
, 0, sizeof(split_points
));
1763 /* Mark all used registers as fully splittable */
1764 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1765 if (inst
->dst
.file
== VGRF
) {
1766 int reg
= vgrf_to_reg
[inst
->dst
.nr
];
1767 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->dst
.nr
]; j
++)
1768 split_points
[reg
+ j
] = true;
1771 for (int i
= 0; i
< inst
->sources
; i
++) {
1772 if (inst
->src
[i
].file
== VGRF
) {
1773 int reg
= vgrf_to_reg
[inst
->src
[i
].nr
];
1774 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->src
[i
].nr
]; j
++)
1775 split_points
[reg
+ j
] = true;
1780 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1781 if (inst
->dst
.file
== VGRF
) {
1782 int reg
= vgrf_to_reg
[inst
->dst
.nr
] + inst
->dst
.reg_offset
;
1783 for (int j
= 1; j
< inst
->regs_written
; j
++)
1784 split_points
[reg
+ j
] = false;
1786 for (int i
= 0; i
< inst
->sources
; i
++) {
1787 if (inst
->src
[i
].file
== VGRF
) {
1788 int reg
= vgrf_to_reg
[inst
->src
[i
].nr
] + inst
->src
[i
].reg_offset
;
1789 for (int j
= 1; j
< inst
->regs_read(i
); j
++)
1790 split_points
[reg
+ j
] = false;
1795 int new_virtual_grf
[reg_count
];
1796 int new_reg_offset
[reg_count
];
1799 for (int i
= 0; i
< num_vars
; i
++) {
1800 /* The first one should always be 0 as a quick sanity check. */
1801 assert(split_points
[reg
] == false);
1804 new_reg_offset
[reg
] = 0;
1809 for (unsigned j
= 1; j
< alloc
.sizes
[i
]; j
++) {
1810 /* If this is a split point, reset the offset to 0 and allocate a
1811 * new virtual GRF for the previous offset many registers
1813 if (split_points
[reg
]) {
1814 assert(offset
<= MAX_VGRF_SIZE
);
1815 int grf
= alloc
.allocate(offset
);
1816 for (int k
= reg
- offset
; k
< reg
; k
++)
1817 new_virtual_grf
[k
] = grf
;
1820 new_reg_offset
[reg
] = offset
;
1825 /* The last one gets the original register number */
1826 assert(offset
<= MAX_VGRF_SIZE
);
1827 alloc
.sizes
[i
] = offset
;
1828 for (int k
= reg
- offset
; k
< reg
; k
++)
1829 new_virtual_grf
[k
] = i
;
1831 assert(reg
== reg_count
);
1833 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1834 if (inst
->dst
.file
== VGRF
) {
1835 reg
= vgrf_to_reg
[inst
->dst
.nr
] + inst
->dst
.reg_offset
;
1836 inst
->dst
.nr
= new_virtual_grf
[reg
];
1837 inst
->dst
.reg_offset
= new_reg_offset
[reg
];
1838 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1840 for (int i
= 0; i
< inst
->sources
; i
++) {
1841 if (inst
->src
[i
].file
== VGRF
) {
1842 reg
= vgrf_to_reg
[inst
->src
[i
].nr
] + inst
->src
[i
].reg_offset
;
1843 inst
->src
[i
].nr
= new_virtual_grf
[reg
];
1844 inst
->src
[i
].reg_offset
= new_reg_offset
[reg
];
1845 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1849 invalidate_live_intervals();
1853 * Remove unused virtual GRFs and compact the virtual_grf_* arrays.
1855 * During code generation, we create tons of temporary variables, many of
1856 * which get immediately killed and are never used again. Yet, in later
1857 * optimization and analysis passes, such as compute_live_intervals, we need
1858 * to loop over all the virtual GRFs. Compacting them can save a lot of
1862 fs_visitor::compact_virtual_grfs()
1864 bool progress
= false;
1865 int remap_table
[this->alloc
.count
];
1866 memset(remap_table
, -1, sizeof(remap_table
));
1868 /* Mark which virtual GRFs are used. */
1869 foreach_block_and_inst(block
, const fs_inst
, inst
, cfg
) {
1870 if (inst
->dst
.file
== VGRF
)
1871 remap_table
[inst
->dst
.nr
] = 0;
1873 for (int i
= 0; i
< inst
->sources
; i
++) {
1874 if (inst
->src
[i
].file
== VGRF
)
1875 remap_table
[inst
->src
[i
].nr
] = 0;
1879 /* Compact the GRF arrays. */
1881 for (unsigned i
= 0; i
< this->alloc
.count
; i
++) {
1882 if (remap_table
[i
] == -1) {
1883 /* We just found an unused register. This means that we are
1884 * actually going to compact something.
1888 remap_table
[i
] = new_index
;
1889 alloc
.sizes
[new_index
] = alloc
.sizes
[i
];
1890 invalidate_live_intervals();
1895 this->alloc
.count
= new_index
;
1897 /* Patch all the instructions to use the newly renumbered registers */
1898 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1899 if (inst
->dst
.file
== VGRF
)
1900 inst
->dst
.nr
= remap_table
[inst
->dst
.nr
];
1902 for (int i
= 0; i
< inst
->sources
; i
++) {
1903 if (inst
->src
[i
].file
== VGRF
)
1904 inst
->src
[i
].nr
= remap_table
[inst
->src
[i
].nr
];
1908 /* Patch all the references to delta_xy, since they're used in register
1909 * allocation. If they're unused, switch them to BAD_FILE so we don't
1910 * think some random VGRF is delta_xy.
1912 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
1913 if (delta_xy
[i
].file
== VGRF
) {
1914 if (remap_table
[delta_xy
[i
].nr
] != -1) {
1915 delta_xy
[i
].nr
= remap_table
[delta_xy
[i
].nr
];
1917 delta_xy
[i
].file
= BAD_FILE
;
1926 * Assign UNIFORM file registers to either push constants or pull constants.
1928 * We allow a fragment shader to have more than the specified minimum
1929 * maximum number of fragment shader uniform components (64). If
1930 * there are too many of these, they'd fill up all of register space.
1931 * So, this will push some of them out to the pull constant buffer and
1932 * update the program to load them. We also use pull constants for all
1933 * indirect constant loads because we don't support indirect accesses in
1937 fs_visitor::assign_constant_locations()
1939 /* Only the first compile gets to decide on locations. */
1940 if (dispatch_width
!= min_dispatch_width
)
1943 unsigned int num_pull_constants
= 0;
1945 pull_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
1946 memset(pull_constant_loc
, -1, sizeof(pull_constant_loc
[0]) * uniforms
);
1948 bool is_live
[uniforms
];
1949 memset(is_live
, 0, sizeof(is_live
));
1951 /* First, we walk through the instructions and do two things:
1953 * 1) Figure out which uniforms are live.
1955 * 2) Find all indirect access of uniform arrays and flag them as needing
1956 * to go into the pull constant buffer.
1958 * Note that we don't move constant-indexed accesses to arrays. No
1959 * testing has been done of the performance impact of this choice.
1961 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
1962 for (int i
= 0 ; i
< inst
->sources
; i
++) {
1963 if (inst
->src
[i
].file
!= UNIFORM
)
1966 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&& i
== 0) {
1967 int uniform
= inst
->src
[0].nr
;
1969 /* If this array isn't already present in the pull constant buffer,
1972 if (pull_constant_loc
[uniform
] == -1) {
1973 assert(param_size
[uniform
]);
1974 for (int j
= 0; j
< param_size
[uniform
]; j
++)
1975 pull_constant_loc
[uniform
+ j
] = num_pull_constants
++;
1978 /* Mark the the one accessed uniform as live */
1979 int constant_nr
= inst
->src
[i
].nr
+ inst
->src
[i
].reg_offset
;
1980 if (constant_nr
>= 0 && constant_nr
< (int) uniforms
)
1981 is_live
[constant_nr
] = true;
1986 /* Only allow 16 registers (128 uniform components) as push constants.
1988 * Just demote the end of the list. We could probably do better
1989 * here, demoting things that are rarely used in the program first.
1991 * If changing this value, note the limitation about total_regs in
1994 unsigned int max_push_components
= 16 * 8;
1995 unsigned int num_push_constants
= 0;
1997 push_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
1999 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2000 if (!is_live
[i
] || pull_constant_loc
[i
] != -1) {
2001 /* This UNIFORM register is either dead, or has already been demoted
2002 * to a pull const. Mark it as no longer living in the param[] array.
2004 push_constant_loc
[i
] = -1;
2008 if (num_push_constants
< max_push_components
) {
2009 /* Retain as a push constant. Record the location in the params[]
2012 push_constant_loc
[i
] = num_push_constants
++;
2014 /* Demote to a pull constant. */
2015 push_constant_loc
[i
] = -1;
2016 pull_constant_loc
[i
] = num_pull_constants
++;
2020 stage_prog_data
->nr_params
= num_push_constants
;
2021 stage_prog_data
->nr_pull_params
= num_pull_constants
;
2023 /* Up until now, the param[] array has been indexed by reg + reg_offset
2024 * of UNIFORM registers. Move pull constants into pull_param[] and
2025 * condense param[] to only contain the uniforms we chose to push.
2027 * NOTE: Because we are condensing the params[] array, we know that
2028 * push_constant_loc[i] <= i and we can do it in one smooth loop without
2029 * having to make a copy.
2031 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2032 const gl_constant_value
*value
= stage_prog_data
->param
[i
];
2034 if (pull_constant_loc
[i
] != -1) {
2035 stage_prog_data
->pull_param
[pull_constant_loc
[i
]] = value
;
2036 } else if (push_constant_loc
[i
] != -1) {
2037 stage_prog_data
->param
[push_constant_loc
[i
]] = value
;
2043 * Replace UNIFORM register file access with either UNIFORM_PULL_CONSTANT_LOAD
2044 * or VARYING_PULL_CONSTANT_LOAD instructions which load values into VGRFs.
2047 fs_visitor::demote_pull_constants()
2049 const unsigned index
= stage_prog_data
->binding_table
.pull_constants_start
;
2051 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2052 /* Set up the annotation tracking for new generated instructions. */
2053 const fs_builder
ibld(this, block
, inst
);
2055 for (int i
= 0; i
< inst
->sources
; i
++) {
2056 if (inst
->src
[i
].file
!= UNIFORM
)
2059 /* We'll handle this case later */
2060 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&& i
== 0)
2063 unsigned location
= inst
->src
[i
].nr
+ inst
->src
[i
].reg_offset
;
2064 if (location
>= uniforms
)
2065 continue; /* Out of bounds access */
2067 int pull_index
= pull_constant_loc
[location
];
2069 if (pull_index
== -1)
2072 assert(inst
->src
[i
].stride
== 0);
2074 fs_reg dst
= vgrf(glsl_type::float_type
);
2075 const fs_builder ubld
= ibld
.exec_all().group(8, 0);
2076 struct brw_reg offset
= brw_imm_ud((unsigned)(pull_index
* 4) & ~15);
2077 ubld
.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
,
2078 dst
, brw_imm_ud(index
), offset
);
2080 /* Rewrite the instruction to use the temporary VGRF. */
2081 inst
->src
[i
].file
= VGRF
;
2082 inst
->src
[i
].nr
= dst
.nr
;
2083 inst
->src
[i
].reg_offset
= 0;
2084 inst
->src
[i
].set_smear(pull_index
& 3);
2086 brw_mark_surface_used(prog_data
, index
);
2089 if (inst
->opcode
== SHADER_OPCODE_MOV_INDIRECT
&&
2090 inst
->src
[0].file
== UNIFORM
) {
2092 unsigned location
= inst
->src
[0].nr
+ inst
->src
[0].reg_offset
;
2093 if (location
>= uniforms
)
2094 continue; /* Out of bounds access */
2096 int pull_index
= pull_constant_loc
[location
];
2097 assert(pull_index
>= 0); /* This had better be pull */
2099 VARYING_PULL_CONSTANT_LOAD(ibld
, inst
->dst
,
2103 inst
->remove(block
);
2105 brw_mark_surface_used(prog_data
, index
);
2108 invalidate_live_intervals();
2112 fs_visitor::opt_algebraic()
2114 bool progress
= false;
2116 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2117 switch (inst
->opcode
) {
2118 case BRW_OPCODE_MOV
:
2119 if (inst
->src
[0].file
!= IMM
)
2122 if (inst
->saturate
) {
2123 if (inst
->dst
.type
!= inst
->src
[0].type
)
2124 assert(!"unimplemented: saturate mixed types");
2126 if (brw_saturate_immediate(inst
->dst
.type
,
2127 &inst
->src
[0].as_brw_reg())) {
2128 inst
->saturate
= false;
2134 case BRW_OPCODE_MUL
:
2135 if (inst
->src
[1].file
!= IMM
)
2139 if (inst
->src
[1].is_one()) {
2140 inst
->opcode
= BRW_OPCODE_MOV
;
2141 inst
->src
[1] = reg_undef
;
2147 if (inst
->src
[1].is_negative_one()) {
2148 inst
->opcode
= BRW_OPCODE_MOV
;
2149 inst
->src
[0].negate
= !inst
->src
[0].negate
;
2150 inst
->src
[1] = reg_undef
;
2156 if (inst
->src
[1].is_zero()) {
2157 inst
->opcode
= BRW_OPCODE_MOV
;
2158 inst
->src
[0] = inst
->src
[1];
2159 inst
->src
[1] = reg_undef
;
2164 if (inst
->src
[0].file
== IMM
) {
2165 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
2166 inst
->opcode
= BRW_OPCODE_MOV
;
2167 inst
->src
[0].f
*= inst
->src
[1].f
;
2168 inst
->src
[1] = reg_undef
;
2173 case BRW_OPCODE_ADD
:
2174 if (inst
->src
[1].file
!= IMM
)
2178 if (inst
->src
[1].is_zero()) {
2179 inst
->opcode
= BRW_OPCODE_MOV
;
2180 inst
->src
[1] = reg_undef
;
2185 if (inst
->src
[0].file
== IMM
) {
2186 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
2187 inst
->opcode
= BRW_OPCODE_MOV
;
2188 inst
->src
[0].f
+= inst
->src
[1].f
;
2189 inst
->src
[1] = reg_undef
;
2195 if (inst
->src
[0].equals(inst
->src
[1])) {
2196 inst
->opcode
= BRW_OPCODE_MOV
;
2197 inst
->src
[1] = reg_undef
;
2202 case BRW_OPCODE_LRP
:
2203 if (inst
->src
[1].equals(inst
->src
[2])) {
2204 inst
->opcode
= BRW_OPCODE_MOV
;
2205 inst
->src
[0] = inst
->src
[1];
2206 inst
->src
[1] = reg_undef
;
2207 inst
->src
[2] = reg_undef
;
2212 case BRW_OPCODE_CMP
:
2213 if (inst
->conditional_mod
== BRW_CONDITIONAL_GE
&&
2215 inst
->src
[0].negate
&&
2216 inst
->src
[1].is_zero()) {
2217 inst
->src
[0].abs
= false;
2218 inst
->src
[0].negate
= false;
2219 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2224 case BRW_OPCODE_SEL
:
2225 if (inst
->src
[0].equals(inst
->src
[1])) {
2226 inst
->opcode
= BRW_OPCODE_MOV
;
2227 inst
->src
[1] = reg_undef
;
2228 inst
->predicate
= BRW_PREDICATE_NONE
;
2229 inst
->predicate_inverse
= false;
2231 } else if (inst
->saturate
&& inst
->src
[1].file
== IMM
) {
2232 switch (inst
->conditional_mod
) {
2233 case BRW_CONDITIONAL_LE
:
2234 case BRW_CONDITIONAL_L
:
2235 switch (inst
->src
[1].type
) {
2236 case BRW_REGISTER_TYPE_F
:
2237 if (inst
->src
[1].f
>= 1.0f
) {
2238 inst
->opcode
= BRW_OPCODE_MOV
;
2239 inst
->src
[1] = reg_undef
;
2240 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2248 case BRW_CONDITIONAL_GE
:
2249 case BRW_CONDITIONAL_G
:
2250 switch (inst
->src
[1].type
) {
2251 case BRW_REGISTER_TYPE_F
:
2252 if (inst
->src
[1].f
<= 0.0f
) {
2253 inst
->opcode
= BRW_OPCODE_MOV
;
2254 inst
->src
[1] = reg_undef
;
2255 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2267 case BRW_OPCODE_MAD
:
2268 if (inst
->src
[1].is_zero() || inst
->src
[2].is_zero()) {
2269 inst
->opcode
= BRW_OPCODE_MOV
;
2270 inst
->src
[1] = reg_undef
;
2271 inst
->src
[2] = reg_undef
;
2273 } else if (inst
->src
[0].is_zero()) {
2274 inst
->opcode
= BRW_OPCODE_MUL
;
2275 inst
->src
[0] = inst
->src
[2];
2276 inst
->src
[2] = reg_undef
;
2278 } else if (inst
->src
[1].is_one()) {
2279 inst
->opcode
= BRW_OPCODE_ADD
;
2280 inst
->src
[1] = inst
->src
[2];
2281 inst
->src
[2] = reg_undef
;
2283 } else if (inst
->src
[2].is_one()) {
2284 inst
->opcode
= BRW_OPCODE_ADD
;
2285 inst
->src
[2] = reg_undef
;
2287 } else if (inst
->src
[1].file
== IMM
&& inst
->src
[2].file
== IMM
) {
2288 inst
->opcode
= BRW_OPCODE_ADD
;
2289 inst
->src
[1].f
*= inst
->src
[2].f
;
2290 inst
->src
[2] = reg_undef
;
2294 case SHADER_OPCODE_BROADCAST
:
2295 if (is_uniform(inst
->src
[0])) {
2296 inst
->opcode
= BRW_OPCODE_MOV
;
2298 inst
->force_writemask_all
= true;
2300 } else if (inst
->src
[1].file
== IMM
) {
2301 inst
->opcode
= BRW_OPCODE_MOV
;
2302 inst
->src
[0] = component(inst
->src
[0],
2305 inst
->force_writemask_all
= true;
2314 /* Swap if src[0] is immediate. */
2315 if (progress
&& inst
->is_commutative()) {
2316 if (inst
->src
[0].file
== IMM
) {
2317 fs_reg tmp
= inst
->src
[1];
2318 inst
->src
[1] = inst
->src
[0];
2327 * Optimize sample messages that have constant zero values for the trailing
2328 * texture coordinates. We can just reduce the message length for these
2329 * instructions instead of reserving a register for it. Trailing parameters
2330 * that aren't sent default to zero anyway. This will cause the dead code
2331 * eliminator to remove the MOV instruction that would otherwise be emitted to
2332 * set up the zero value.
2335 fs_visitor::opt_zero_samples()
2337 /* Gen4 infers the texturing opcode based on the message length so we can't
2340 if (devinfo
->gen
< 5)
2343 bool progress
= false;
2345 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2346 if (!inst
->is_tex())
2349 fs_inst
*load_payload
= (fs_inst
*) inst
->prev
;
2351 if (load_payload
->is_head_sentinel() ||
2352 load_payload
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
2355 /* We don't want to remove the message header or the first parameter.
2356 * Removing the first parameter is not allowed, see the Haswell PRM
2357 * volume 7, page 149:
2359 * "Parameter 0 is required except for the sampleinfo message, which
2360 * has no parameter 0"
2362 while (inst
->mlen
> inst
->header_size
+ inst
->exec_size
/ 8 &&
2363 load_payload
->src
[(inst
->mlen
- inst
->header_size
) /
2364 (inst
->exec_size
/ 8) +
2365 inst
->header_size
- 1].is_zero()) {
2366 inst
->mlen
-= inst
->exec_size
/ 8;
2372 invalidate_live_intervals();
2378 * Optimize sample messages which are followed by the final RT write.
2380 * CHV, and GEN9+ can mark a texturing SEND instruction with EOT to have its
2381 * results sent directly to the framebuffer, bypassing the EU. Recognize the
2382 * final texturing results copied to the framebuffer write payload and modify
2383 * them to write to the framebuffer directly.
2386 fs_visitor::opt_sampler_eot()
2388 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2390 if (stage
!= MESA_SHADER_FRAGMENT
)
2393 if (devinfo
->gen
< 9 && !devinfo
->is_cherryview
)
2396 /* FINISHME: It should be possible to implement this optimization when there
2397 * are multiple drawbuffers.
2399 if (key
->nr_color_regions
!= 1)
2402 /* Look for a texturing instruction immediately before the final FB_WRITE. */
2403 bblock_t
*block
= cfg
->blocks
[cfg
->num_blocks
- 1];
2404 fs_inst
*fb_write
= (fs_inst
*)block
->end();
2405 assert(fb_write
->eot
);
2406 assert(fb_write
->opcode
== FS_OPCODE_FB_WRITE
);
2408 fs_inst
*tex_inst
= (fs_inst
*) fb_write
->prev
;
2410 /* There wasn't one; nothing to do. */
2411 if (unlikely(tex_inst
->is_head_sentinel()) || !tex_inst
->is_tex())
2414 /* 3D Sampler » Messages » Message Format
2416 * “Response Length of zero is allowed on all SIMD8* and SIMD16* sampler
2417 * messages except sample+killpix, resinfo, sampleinfo, LOD, and gather4*”
2419 if (tex_inst
->opcode
== SHADER_OPCODE_TXS
||
2420 tex_inst
->opcode
== SHADER_OPCODE_SAMPLEINFO
||
2421 tex_inst
->opcode
== SHADER_OPCODE_LOD
||
2422 tex_inst
->opcode
== SHADER_OPCODE_TG4
||
2423 tex_inst
->opcode
== SHADER_OPCODE_TG4_OFFSET
)
2426 /* If there's no header present, we need to munge the LOAD_PAYLOAD as well.
2427 * It's very likely to be the previous instruction.
2429 fs_inst
*load_payload
= (fs_inst
*) tex_inst
->prev
;
2430 if (load_payload
->is_head_sentinel() ||
2431 load_payload
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
2434 assert(!tex_inst
->eot
); /* We can't get here twice */
2435 assert((tex_inst
->offset
& (0xff << 24)) == 0);
2437 const fs_builder
ibld(this, block
, tex_inst
);
2439 tex_inst
->offset
|= fb_write
->target
<< 24;
2440 tex_inst
->eot
= true;
2441 tex_inst
->dst
= ibld
.null_reg_ud();
2442 fb_write
->remove(cfg
->blocks
[cfg
->num_blocks
- 1]);
2444 /* If a header is present, marking the eot is sufficient. Otherwise, we need
2445 * to create a new LOAD_PAYLOAD command with the same sources and a space
2446 * saved for the header. Using a new destination register not only makes sure
2447 * we have enough space, but it will make sure the dead code eliminator kills
2448 * the instruction that this will replace.
2450 if (tex_inst
->header_size
!= 0) {
2451 invalidate_live_intervals();
2455 fs_reg send_header
= ibld
.vgrf(BRW_REGISTER_TYPE_F
,
2456 load_payload
->sources
+ 1);
2457 fs_reg
*new_sources
=
2458 ralloc_array(mem_ctx
, fs_reg
, load_payload
->sources
+ 1);
2460 new_sources
[0] = fs_reg();
2461 for (int i
= 0; i
< load_payload
->sources
; i
++)
2462 new_sources
[i
+1] = load_payload
->src
[i
];
2464 /* The LOAD_PAYLOAD helper seems like the obvious choice here. However, it
2465 * requires a lot of information about the sources to appropriately figure
2466 * out the number of registers needed to be used. Given this stage in our
2467 * optimization, we may not have the appropriate GRFs required by
2468 * LOAD_PAYLOAD at this point (copy propagation). Therefore, we need to
2469 * manually emit the instruction.
2471 fs_inst
*new_load_payload
= new(mem_ctx
) fs_inst(SHADER_OPCODE_LOAD_PAYLOAD
,
2472 load_payload
->exec_size
,
2475 load_payload
->sources
+ 1);
2477 new_load_payload
->regs_written
= load_payload
->regs_written
+ 1;
2478 new_load_payload
->header_size
= 1;
2480 tex_inst
->header_size
= 1;
2481 tex_inst
->insert_before(cfg
->blocks
[cfg
->num_blocks
- 1], new_load_payload
);
2482 tex_inst
->src
[0] = send_header
;
2484 invalidate_live_intervals();
2489 fs_visitor::opt_register_renaming()
2491 bool progress
= false;
2494 int remap
[alloc
.count
];
2495 memset(remap
, -1, sizeof(int) * alloc
.count
);
2497 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2498 if (inst
->opcode
== BRW_OPCODE_IF
|| inst
->opcode
== BRW_OPCODE_DO
) {
2500 } else if (inst
->opcode
== BRW_OPCODE_ENDIF
||
2501 inst
->opcode
== BRW_OPCODE_WHILE
) {
2505 /* Rewrite instruction sources. */
2506 for (int i
= 0; i
< inst
->sources
; i
++) {
2507 if (inst
->src
[i
].file
== VGRF
&&
2508 remap
[inst
->src
[i
].nr
] != -1 &&
2509 remap
[inst
->src
[i
].nr
] != inst
->src
[i
].nr
) {
2510 inst
->src
[i
].nr
= remap
[inst
->src
[i
].nr
];
2515 const int dst
= inst
->dst
.nr
;
2518 inst
->dst
.file
== VGRF
&&
2519 alloc
.sizes
[inst
->dst
.nr
] == inst
->exec_size
/ 8 &&
2520 !inst
->is_partial_write()) {
2521 if (remap
[dst
] == -1) {
2524 remap
[dst
] = alloc
.allocate(inst
->exec_size
/ 8);
2525 inst
->dst
.nr
= remap
[dst
];
2528 } else if (inst
->dst
.file
== VGRF
&&
2530 remap
[dst
] != dst
) {
2531 inst
->dst
.nr
= remap
[dst
];
2537 invalidate_live_intervals();
2539 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
2540 if (delta_xy
[i
].file
== VGRF
&& remap
[delta_xy
[i
].nr
] != -1) {
2541 delta_xy
[i
].nr
= remap
[delta_xy
[i
].nr
];
2550 * Remove redundant or useless discard jumps.
2552 * For example, we can eliminate jumps in the following sequence:
2554 * discard-jump (redundant with the next jump)
2555 * discard-jump (useless; jumps to the next instruction)
2559 fs_visitor::opt_redundant_discard_jumps()
2561 bool progress
= false;
2563 bblock_t
*last_bblock
= cfg
->blocks
[cfg
->num_blocks
- 1];
2565 fs_inst
*placeholder_halt
= NULL
;
2566 foreach_inst_in_block_reverse(fs_inst
, inst
, last_bblock
) {
2567 if (inst
->opcode
== FS_OPCODE_PLACEHOLDER_HALT
) {
2568 placeholder_halt
= inst
;
2573 if (!placeholder_halt
)
2576 /* Delete any HALTs immediately before the placeholder halt. */
2577 for (fs_inst
*prev
= (fs_inst
*) placeholder_halt
->prev
;
2578 !prev
->is_head_sentinel() && prev
->opcode
== FS_OPCODE_DISCARD_JUMP
;
2579 prev
= (fs_inst
*) placeholder_halt
->prev
) {
2580 prev
->remove(last_bblock
);
2585 invalidate_live_intervals();
2591 fs_visitor::compute_to_mrf()
2593 bool progress
= false;
2596 /* No MRFs on Gen >= 7. */
2597 if (devinfo
->gen
>= 7)
2600 calculate_live_intervals();
2602 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2606 if (inst
->opcode
!= BRW_OPCODE_MOV
||
2607 inst
->is_partial_write() ||
2608 inst
->dst
.file
!= MRF
|| inst
->src
[0].file
!= VGRF
||
2609 inst
->dst
.type
!= inst
->src
[0].type
||
2610 inst
->src
[0].abs
|| inst
->src
[0].negate
||
2611 !inst
->src
[0].is_contiguous() ||
2612 inst
->src
[0].subreg_offset
)
2615 /* Work out which hardware MRF registers are written by this
2618 int mrf_low
= inst
->dst
.nr
& ~BRW_MRF_COMPR4
;
2620 if (inst
->dst
.nr
& BRW_MRF_COMPR4
) {
2621 mrf_high
= mrf_low
+ 4;
2622 } else if (inst
->exec_size
== 16) {
2623 mrf_high
= mrf_low
+ 1;
2628 /* Can't compute-to-MRF this GRF if someone else was going to
2631 if (this->virtual_grf_end
[inst
->src
[0].nr
] > ip
)
2634 /* Found a move of a GRF to a MRF. Let's see if we can go
2635 * rewrite the thing that made this GRF to write into the MRF.
2637 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
2638 if (scan_inst
->dst
.file
== VGRF
&&
2639 scan_inst
->dst
.nr
== inst
->src
[0].nr
) {
2640 /* Found the last thing to write our reg we want to turn
2641 * into a compute-to-MRF.
2644 /* If this one instruction didn't populate all the
2645 * channels, bail. We might be able to rewrite everything
2646 * that writes that reg, but it would require smarter
2647 * tracking to delay the rewriting until complete success.
2649 if (scan_inst
->is_partial_write())
2652 /* Things returning more than one register would need us to
2653 * understand coalescing out more than one MOV at a time.
2655 if (scan_inst
->regs_written
> scan_inst
->exec_size
/ 8)
2658 /* SEND instructions can't have MRF as a destination. */
2659 if (scan_inst
->mlen
)
2662 if (devinfo
->gen
== 6) {
2663 /* gen6 math instructions must have the destination be
2664 * GRF, so no compute-to-MRF for them.
2666 if (scan_inst
->is_math()) {
2671 if (scan_inst
->dst
.reg_offset
== inst
->src
[0].reg_offset
) {
2672 /* Found the creator of our MRF's source value. */
2673 scan_inst
->dst
.file
= MRF
;
2674 scan_inst
->dst
.nr
= inst
->dst
.nr
;
2675 scan_inst
->saturate
|= inst
->saturate
;
2676 inst
->remove(block
);
2682 /* We don't handle control flow here. Most computation of
2683 * values that end up in MRFs are shortly before the MRF
2686 if (block
->start() == scan_inst
)
2689 /* You can't read from an MRF, so if someone else reads our
2690 * MRF's source GRF that we wanted to rewrite, that stops us.
2692 bool interfered
= false;
2693 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
2694 if (scan_inst
->src
[i
].file
== VGRF
&&
2695 scan_inst
->src
[i
].nr
== inst
->src
[0].nr
&&
2696 scan_inst
->src
[i
].reg_offset
== inst
->src
[0].reg_offset
) {
2703 if (scan_inst
->dst
.file
== MRF
) {
2704 /* If somebody else writes our MRF here, we can't
2705 * compute-to-MRF before that.
2707 int scan_mrf_low
= scan_inst
->dst
.nr
& ~BRW_MRF_COMPR4
;
2710 if (scan_inst
->dst
.nr
& BRW_MRF_COMPR4
) {
2711 scan_mrf_high
= scan_mrf_low
+ 4;
2712 } else if (scan_inst
->exec_size
== 16) {
2713 scan_mrf_high
= scan_mrf_low
+ 1;
2715 scan_mrf_high
= scan_mrf_low
;
2718 if (mrf_low
== scan_mrf_low
||
2719 mrf_low
== scan_mrf_high
||
2720 mrf_high
== scan_mrf_low
||
2721 mrf_high
== scan_mrf_high
) {
2726 if (scan_inst
->mlen
> 0 && scan_inst
->base_mrf
!= -1) {
2727 /* Found a SEND instruction, which means that there are
2728 * live values in MRFs from base_mrf to base_mrf +
2729 * scan_inst->mlen - 1. Don't go pushing our MRF write up
2732 if (mrf_low
>= scan_inst
->base_mrf
&&
2733 mrf_low
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2736 if (mrf_high
>= scan_inst
->base_mrf
&&
2737 mrf_high
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2745 invalidate_live_intervals();
2751 * Eliminate FIND_LIVE_CHANNEL instructions occurring outside any control
2752 * flow. We could probably do better here with some form of divergence
2756 fs_visitor::eliminate_find_live_channel()
2758 bool progress
= false;
2761 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2762 switch (inst
->opcode
) {
2768 case BRW_OPCODE_ENDIF
:
2769 case BRW_OPCODE_WHILE
:
2773 case FS_OPCODE_DISCARD_JUMP
:
2774 /* This can potentially make control flow non-uniform until the end
2779 case SHADER_OPCODE_FIND_LIVE_CHANNEL
:
2781 inst
->opcode
= BRW_OPCODE_MOV
;
2782 inst
->src
[0] = brw_imm_ud(0u);
2784 inst
->force_writemask_all
= true;
2798 * Once we've generated code, try to convert normal FS_OPCODE_FB_WRITE
2799 * instructions to FS_OPCODE_REP_FB_WRITE.
2802 fs_visitor::emit_repclear_shader()
2804 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2806 int color_mrf
= base_mrf
+ 2;
2810 mov
= bld
.exec_all().group(4, 0)
2811 .MOV(brw_message_reg(color_mrf
),
2812 fs_reg(UNIFORM
, 0, BRW_REGISTER_TYPE_F
));
2814 struct brw_reg reg
=
2815 brw_reg(BRW_GENERAL_REGISTER_FILE
, 2, 3, 0, 0, BRW_REGISTER_TYPE_F
,
2816 BRW_VERTICAL_STRIDE_8
, BRW_WIDTH_2
, BRW_HORIZONTAL_STRIDE_4
,
2817 BRW_SWIZZLE_XYZW
, WRITEMASK_XYZW
);
2819 mov
= bld
.exec_all().group(4, 0)
2820 .MOV(vec4(brw_message_reg(color_mrf
)), fs_reg(reg
));
2824 if (key
->nr_color_regions
== 1) {
2825 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
2826 write
->saturate
= key
->clamp_fragment_color
;
2827 write
->base_mrf
= color_mrf
;
2829 write
->header_size
= 0;
2832 assume(key
->nr_color_regions
> 0);
2833 for (int i
= 0; i
< key
->nr_color_regions
; ++i
) {
2834 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
2835 write
->saturate
= key
->clamp_fragment_color
;
2836 write
->base_mrf
= base_mrf
;
2838 write
->header_size
= 2;
2846 assign_constant_locations();
2847 assign_curb_setup();
2849 /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
2851 assert(mov
->src
[0].file
== FIXED_GRF
);
2852 mov
->src
[0] = brw_vec4_grf(mov
->src
[0].nr
, 0);
2857 * Walks through basic blocks, looking for repeated MRF writes and
2858 * removing the later ones.
2861 fs_visitor::remove_duplicate_mrf_writes()
2863 fs_inst
*last_mrf_move
[BRW_MAX_MRF(devinfo
->gen
)];
2864 bool progress
= false;
2866 /* Need to update the MRF tracking for compressed instructions. */
2867 if (dispatch_width
== 16)
2870 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2872 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2873 if (inst
->is_control_flow()) {
2874 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2877 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2878 inst
->dst
.file
== MRF
) {
2879 fs_inst
*prev_inst
= last_mrf_move
[inst
->dst
.nr
];
2880 if (prev_inst
&& inst
->equals(prev_inst
)) {
2881 inst
->remove(block
);
2887 /* Clear out the last-write records for MRFs that were overwritten. */
2888 if (inst
->dst
.file
== MRF
) {
2889 last_mrf_move
[inst
->dst
.nr
] = NULL
;
2892 if (inst
->mlen
> 0 && inst
->base_mrf
!= -1) {
2893 /* Found a SEND instruction, which will include two or fewer
2894 * implied MRF writes. We could do better here.
2896 for (int i
= 0; i
< implied_mrf_writes(inst
); i
++) {
2897 last_mrf_move
[inst
->base_mrf
+ i
] = NULL
;
2901 /* Clear out any MRF move records whose sources got overwritten. */
2902 if (inst
->dst
.file
== VGRF
) {
2903 for (unsigned int i
= 0; i
< ARRAY_SIZE(last_mrf_move
); i
++) {
2904 if (last_mrf_move
[i
] &&
2905 last_mrf_move
[i
]->src
[0].nr
== inst
->dst
.nr
) {
2906 last_mrf_move
[i
] = NULL
;
2911 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2912 inst
->dst
.file
== MRF
&&
2913 inst
->src
[0].file
== VGRF
&&
2914 !inst
->is_partial_write()) {
2915 last_mrf_move
[inst
->dst
.nr
] = inst
;
2920 invalidate_live_intervals();
2926 clear_deps_for_inst_src(fs_inst
*inst
, bool *deps
, int first_grf
, int grf_len
)
2928 /* Clear the flag for registers that actually got read (as expected). */
2929 for (int i
= 0; i
< inst
->sources
; i
++) {
2931 if (inst
->src
[i
].file
== VGRF
|| inst
->src
[i
].file
== FIXED_GRF
) {
2932 grf
= inst
->src
[i
].nr
;
2937 if (grf
>= first_grf
&&
2938 grf
< first_grf
+ grf_len
) {
2939 deps
[grf
- first_grf
] = false;
2940 if (inst
->exec_size
== 16)
2941 deps
[grf
- first_grf
+ 1] = false;
2947 * Implements this workaround for the original 965:
2949 * "[DevBW, DevCL] Implementation Restrictions: As the hardware does not
2950 * check for post destination dependencies on this instruction, software
2951 * must ensure that there is no destination hazard for the case of ‘write
2952 * followed by a posted write’ shown in the following example.
2955 * 2. send r3.xy <rest of send instruction>
2958 * Due to no post-destination dependency check on the ‘send’, the above
2959 * code sequence could have two instructions (1 and 2) in flight at the
2960 * same time that both consider ‘r3’ as the target of their final writes.
2963 fs_visitor::insert_gen4_pre_send_dependency_workarounds(bblock_t
*block
,
2966 int write_len
= inst
->regs_written
;
2967 int first_write_grf
= inst
->dst
.nr
;
2968 bool needs_dep
[BRW_MAX_MRF(devinfo
->gen
)];
2969 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2971 memset(needs_dep
, false, sizeof(needs_dep
));
2972 memset(needs_dep
, true, write_len
);
2974 clear_deps_for_inst_src(inst
, needs_dep
, first_write_grf
, write_len
);
2976 /* Walk backwards looking for writes to registers we're writing which
2977 * aren't read since being written. If we hit the start of the program,
2978 * we assume that there are no outstanding dependencies on entry to the
2981 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
2982 /* If we hit control flow, assume that there *are* outstanding
2983 * dependencies, and force their cleanup before our instruction.
2985 if (block
->start() == scan_inst
) {
2986 for (int i
= 0; i
< write_len
; i
++) {
2988 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
),
2989 first_write_grf
+ i
);
2994 /* We insert our reads as late as possible on the assumption that any
2995 * instruction but a MOV that might have left us an outstanding
2996 * dependency has more latency than a MOV.
2998 if (scan_inst
->dst
.file
== VGRF
) {
2999 for (int i
= 0; i
< scan_inst
->regs_written
; i
++) {
3000 int reg
= scan_inst
->dst
.nr
+ i
;
3002 if (reg
>= first_write_grf
&&
3003 reg
< first_write_grf
+ write_len
&&
3004 needs_dep
[reg
- first_write_grf
]) {
3005 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
), reg
);
3006 needs_dep
[reg
- first_write_grf
] = false;
3007 if (scan_inst
->exec_size
== 16)
3008 needs_dep
[reg
- first_write_grf
+ 1] = false;
3013 /* Clear the flag for registers that actually got read (as expected). */
3014 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
3016 /* Continue the loop only if we haven't resolved all the dependencies */
3018 for (i
= 0; i
< write_len
; i
++) {
3028 * Implements this workaround for the original 965:
3030 * "[DevBW, DevCL] Errata: A destination register from a send can not be
3031 * used as a destination register until after it has been sourced by an
3032 * instruction with a different destination register.
3035 fs_visitor::insert_gen4_post_send_dependency_workarounds(bblock_t
*block
, fs_inst
*inst
)
3037 int write_len
= inst
->regs_written
;
3038 int first_write_grf
= inst
->dst
.nr
;
3039 bool needs_dep
[BRW_MAX_MRF(devinfo
->gen
)];
3040 assert(write_len
< (int)sizeof(needs_dep
) - 1);
3042 memset(needs_dep
, false, sizeof(needs_dep
));
3043 memset(needs_dep
, true, write_len
);
3044 /* Walk forwards looking for writes to registers we're writing which aren't
3045 * read before being written.
3047 foreach_inst_in_block_starting_from(fs_inst
, scan_inst
, inst
) {
3048 /* If we hit control flow, force resolve all remaining dependencies. */
3049 if (block
->end() == scan_inst
) {
3050 for (int i
= 0; i
< write_len
; i
++) {
3052 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
3053 first_write_grf
+ i
);
3058 /* Clear the flag for registers that actually got read (as expected). */
3059 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
3061 /* We insert our reads as late as possible since they're reading the
3062 * result of a SEND, which has massive latency.
3064 if (scan_inst
->dst
.file
== VGRF
&&
3065 scan_inst
->dst
.nr
>= first_write_grf
&&
3066 scan_inst
->dst
.nr
< first_write_grf
+ write_len
&&
3067 needs_dep
[scan_inst
->dst
.nr
- first_write_grf
]) {
3068 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
3070 needs_dep
[scan_inst
->dst
.nr
- first_write_grf
] = false;
3073 /* Continue the loop only if we haven't resolved all the dependencies */
3075 for (i
= 0; i
< write_len
; i
++) {
3085 fs_visitor::insert_gen4_send_dependency_workarounds()
3087 if (devinfo
->gen
!= 4 || devinfo
->is_g4x
)
3090 bool progress
= false;
3092 /* Note that we're done with register allocation, so GRF fs_regs always
3093 * have a .reg_offset of 0.
3096 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
3097 if (inst
->mlen
!= 0 && inst
->dst
.file
== VGRF
) {
3098 insert_gen4_pre_send_dependency_workarounds(block
, inst
);
3099 insert_gen4_post_send_dependency_workarounds(block
, inst
);
3105 invalidate_live_intervals();
3109 * Turns the generic expression-style uniform pull constant load instruction
3110 * into a hardware-specific series of instructions for loading a pull
3113 * The expression style allows the CSE pass before this to optimize out
3114 * repeated loads from the same offset, and gives the pre-register-allocation
3115 * scheduling full flexibility, while the conversion to native instructions
3116 * allows the post-register-allocation scheduler the best information
3119 * Note that execution masking for setting up pull constant loads is special:
3120 * the channels that need to be written are unrelated to the current execution
3121 * mask, since a later instruction will use one of the result channels as a
3122 * source operand for all 8 or 16 of its channels.
3125 fs_visitor::lower_uniform_pull_constant_loads()
3127 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
3128 if (inst
->opcode
!= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
)
3131 if (devinfo
->gen
>= 7) {
3132 /* The offset arg is a vec4-aligned immediate byte offset. */
3133 fs_reg const_offset_reg
= inst
->src
[1];
3134 assert(const_offset_reg
.file
== IMM
&&
3135 const_offset_reg
.type
== BRW_REGISTER_TYPE_UD
);
3136 assert(const_offset_reg
.ud
% 16 == 0);
3138 fs_reg payload
, offset
;
3139 if (devinfo
->gen
>= 9) {
3140 /* We have to use a message header on Skylake to get SIMD4x2
3141 * mode. Reserve space for the register.
3143 offset
= payload
= fs_reg(VGRF
, alloc
.allocate(2));
3144 offset
.reg_offset
++;
3147 offset
= payload
= fs_reg(VGRF
, alloc
.allocate(1));
3151 /* This is actually going to be a MOV, but since only the first dword
3152 * is accessed, we have a special opcode to do just that one. Note
3153 * that this needs to be an operation that will be considered a def
3154 * by live variable analysis, or register allocation will explode.
3156 fs_inst
*setup
= new(mem_ctx
) fs_inst(FS_OPCODE_SET_SIMD4X2_OFFSET
,
3157 8, offset
, const_offset_reg
);
3158 setup
->force_writemask_all
= true;
3160 setup
->ir
= inst
->ir
;
3161 setup
->annotation
= inst
->annotation
;
3162 inst
->insert_before(block
, setup
);
3164 /* Similarly, this will only populate the first 4 channels of the
3165 * result register (since we only use smear values from 0-3), but we
3166 * don't tell the optimizer.
3168 inst
->opcode
= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
;
3169 inst
->src
[1] = payload
;
3170 inst
->base_mrf
= -1;
3172 invalidate_live_intervals();
3174 /* Before register allocation, we didn't tell the scheduler about the
3175 * MRF we use. We know it's safe to use this MRF because nothing
3176 * else does except for register spill/unspill, which generates and
3177 * uses its MRF within a single IR instruction.
3179 inst
->base_mrf
= FIRST_PULL_LOAD_MRF(devinfo
->gen
) + 1;
3186 fs_visitor::lower_load_payload()
3188 bool progress
= false;
3190 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3191 if (inst
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
3194 assert(inst
->dst
.file
== MRF
|| inst
->dst
.file
== VGRF
);
3195 assert(inst
->saturate
== false);
3196 fs_reg dst
= inst
->dst
;
3198 /* Get rid of COMPR4. We'll add it back in if we need it */
3199 if (dst
.file
== MRF
)
3200 dst
.nr
= dst
.nr
& ~BRW_MRF_COMPR4
;
3202 const fs_builder
ibld(this, block
, inst
);
3203 const fs_builder hbld
= ibld
.exec_all().group(8, 0);
3205 for (uint8_t i
= 0; i
< inst
->header_size
; i
++) {
3206 if (inst
->src
[i
].file
!= BAD_FILE
) {
3207 fs_reg mov_dst
= retype(dst
, BRW_REGISTER_TYPE_UD
);
3208 fs_reg mov_src
= retype(inst
->src
[i
], BRW_REGISTER_TYPE_UD
);
3209 hbld
.MOV(mov_dst
, mov_src
);
3211 dst
= offset(dst
, hbld
, 1);
3214 if (inst
->dst
.file
== MRF
&& (inst
->dst
.nr
& BRW_MRF_COMPR4
) &&
3215 inst
->exec_size
> 8) {
3216 /* In this case, the payload portion of the LOAD_PAYLOAD isn't
3217 * a straightforward copy. Instead, the result of the
3218 * LOAD_PAYLOAD is treated as interleaved and the first four
3219 * non-header sources are unpacked as:
3230 * This is used for gen <= 5 fb writes.
3232 assert(inst
->exec_size
== 16);
3233 assert(inst
->header_size
+ 4 <= inst
->sources
);
3234 for (uint8_t i
= inst
->header_size
; i
< inst
->header_size
+ 4; i
++) {
3235 if (inst
->src
[i
].file
!= BAD_FILE
) {
3236 if (devinfo
->has_compr4
) {
3237 fs_reg compr4_dst
= retype(dst
, inst
->src
[i
].type
);
3238 compr4_dst
.nr
|= BRW_MRF_COMPR4
;
3239 ibld
.MOV(compr4_dst
, inst
->src
[i
]);
3241 /* Platform doesn't have COMPR4. We have to fake it */
3242 fs_reg mov_dst
= retype(dst
, inst
->src
[i
].type
);
3243 ibld
.half(0).MOV(mov_dst
, half(inst
->src
[i
], 0));
3245 ibld
.half(1).MOV(mov_dst
, half(inst
->src
[i
], 1));
3252 /* The loop above only ever incremented us through the first set
3253 * of 4 registers. However, thanks to the magic of COMPR4, we
3254 * actually wrote to the first 8 registers, so we need to take
3255 * that into account now.
3259 /* The COMPR4 code took care of the first 4 sources. We'll let
3260 * the regular path handle any remaining sources. Yes, we are
3261 * modifying the instruction but we're about to delete it so
3262 * this really doesn't hurt anything.
3264 inst
->header_size
+= 4;
3267 for (uint8_t i
= inst
->header_size
; i
< inst
->sources
; i
++) {
3268 if (inst
->src
[i
].file
!= BAD_FILE
)
3269 ibld
.MOV(retype(dst
, inst
->src
[i
].type
), inst
->src
[i
]);
3270 dst
= offset(dst
, ibld
, 1);
3273 inst
->remove(block
);
3278 invalidate_live_intervals();
3284 fs_visitor::lower_integer_multiplication()
3286 bool progress
= false;
3288 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3289 const fs_builder
ibld(this, block
, inst
);
3291 if (inst
->opcode
== BRW_OPCODE_MUL
) {
3292 if (inst
->dst
.is_accumulator() ||
3293 (inst
->dst
.type
!= BRW_REGISTER_TYPE_D
&&
3294 inst
->dst
.type
!= BRW_REGISTER_TYPE_UD
))
3297 /* Gen8's MUL instruction can do a 32-bit x 32-bit -> 32-bit
3298 * operation directly, but CHV/BXT cannot.
3300 if (devinfo
->gen
>= 8 &&
3301 !devinfo
->is_cherryview
&& !devinfo
->is_broxton
)
3304 if (inst
->src
[1].file
== IMM
&&
3305 inst
->src
[1].ud
< (1 << 16)) {
3306 /* The MUL instruction isn't commutative. On Gen <= 6, only the low
3307 * 16-bits of src0 are read, and on Gen >= 7 only the low 16-bits of
3310 * If multiplying by an immediate value that fits in 16-bits, do a
3311 * single MUL instruction with that value in the proper location.
3313 if (devinfo
->gen
< 7) {
3314 fs_reg
imm(VGRF
, alloc
.allocate(dispatch_width
/ 8),
3316 ibld
.MOV(imm
, inst
->src
[1]);
3317 ibld
.MUL(inst
->dst
, imm
, inst
->src
[0]);
3319 ibld
.MUL(inst
->dst
, inst
->src
[0], inst
->src
[1]);
3322 /* Gen < 8 (and some Gen8+ low-power parts like Cherryview) cannot
3323 * do 32-bit integer multiplication in one instruction, but instead
3324 * must do a sequence (which actually calculates a 64-bit result):
3326 * mul(8) acc0<1>D g3<8,8,1>D g4<8,8,1>D
3327 * mach(8) null g3<8,8,1>D g4<8,8,1>D
3328 * mov(8) g2<1>D acc0<8,8,1>D
3330 * But on Gen > 6, the ability to use second accumulator register
3331 * (acc1) for non-float data types was removed, preventing a simple
3332 * implementation in SIMD16. A 16-channel result can be calculated by
3333 * executing the three instructions twice in SIMD8, once with quarter
3334 * control of 1Q for the first eight channels and again with 2Q for
3335 * the second eight channels.
3337 * Which accumulator register is implicitly accessed (by AccWrEnable
3338 * for instance) is determined by the quarter control. Unfortunately
3339 * Ivybridge (and presumably Baytrail) has a hardware bug in which an
3340 * implicit accumulator access by an instruction with 2Q will access
3341 * acc1 regardless of whether the data type is usable in acc1.
3343 * Specifically, the 2Q mach(8) writes acc1 which does not exist for
3344 * integer data types.
3346 * Since we only want the low 32-bits of the result, we can do two
3347 * 32-bit x 16-bit multiplies (like the mul and mach are doing), and
3348 * adjust the high result and add them (like the mach is doing):
3350 * mul(8) g7<1>D g3<8,8,1>D g4.0<8,8,1>UW
3351 * mul(8) g8<1>D g3<8,8,1>D g4.1<8,8,1>UW
3352 * shl(8) g9<1>D g8<8,8,1>D 16D
3353 * add(8) g2<1>D g7<8,8,1>D g8<8,8,1>D
3355 * We avoid the shl instruction by realizing that we only want to add
3356 * the low 16-bits of the "high" result to the high 16-bits of the
3357 * "low" result and using proper regioning on the add:
3359 * mul(8) g7<1>D g3<8,8,1>D g4.0<16,8,2>UW
3360 * mul(8) g8<1>D g3<8,8,1>D g4.1<16,8,2>UW
3361 * add(8) g7.1<2>UW g7.1<16,8,2>UW g8<16,8,2>UW
3363 * Since it does not use the (single) accumulator register, we can
3364 * schedule multi-component multiplications much better.
3367 fs_reg orig_dst
= inst
->dst
;
3368 if (orig_dst
.is_null() || orig_dst
.file
== MRF
) {
3369 inst
->dst
= fs_reg(VGRF
, alloc
.allocate(dispatch_width
/ 8),
3372 fs_reg low
= inst
->dst
;
3373 fs_reg
high(VGRF
, alloc
.allocate(dispatch_width
/ 8),
3376 if (devinfo
->gen
>= 7) {
3377 fs_reg src1_0_w
= inst
->src
[1];
3378 fs_reg src1_1_w
= inst
->src
[1];
3380 if (inst
->src
[1].file
== IMM
) {
3381 src1_0_w
.ud
&= 0xffff;
3384 src1_0_w
.type
= BRW_REGISTER_TYPE_UW
;
3385 if (src1_0_w
.stride
!= 0) {
3386 assert(src1_0_w
.stride
== 1);
3387 src1_0_w
.stride
= 2;
3390 src1_1_w
.type
= BRW_REGISTER_TYPE_UW
;
3391 if (src1_1_w
.stride
!= 0) {
3392 assert(src1_1_w
.stride
== 1);
3393 src1_1_w
.stride
= 2;
3395 src1_1_w
.subreg_offset
+= type_sz(BRW_REGISTER_TYPE_UW
);
3397 ibld
.MUL(low
, inst
->src
[0], src1_0_w
);
3398 ibld
.MUL(high
, inst
->src
[0], src1_1_w
);
3400 fs_reg src0_0_w
= inst
->src
[0];
3401 fs_reg src0_1_w
= inst
->src
[0];
3403 src0_0_w
.type
= BRW_REGISTER_TYPE_UW
;
3404 if (src0_0_w
.stride
!= 0) {
3405 assert(src0_0_w
.stride
== 1);
3406 src0_0_w
.stride
= 2;
3409 src0_1_w
.type
= BRW_REGISTER_TYPE_UW
;
3410 if (src0_1_w
.stride
!= 0) {
3411 assert(src0_1_w
.stride
== 1);
3412 src0_1_w
.stride
= 2;
3414 src0_1_w
.subreg_offset
+= type_sz(BRW_REGISTER_TYPE_UW
);
3416 ibld
.MUL(low
, src0_0_w
, inst
->src
[1]);
3417 ibld
.MUL(high
, src0_1_w
, inst
->src
[1]);
3420 fs_reg dst
= inst
->dst
;
3421 dst
.type
= BRW_REGISTER_TYPE_UW
;
3422 dst
.subreg_offset
= 2;
3425 high
.type
= BRW_REGISTER_TYPE_UW
;
3428 low
.type
= BRW_REGISTER_TYPE_UW
;
3429 low
.subreg_offset
= 2;
3432 ibld
.ADD(dst
, low
, high
);
3434 if (inst
->conditional_mod
|| orig_dst
.file
== MRF
) {
3435 set_condmod(inst
->conditional_mod
,
3436 ibld
.MOV(orig_dst
, inst
->dst
));
3440 } else if (inst
->opcode
== SHADER_OPCODE_MULH
) {
3441 /* Should have been lowered to 8-wide. */
3442 assert(inst
->exec_size
<= 8);
3443 const fs_reg acc
= retype(brw_acc_reg(inst
->exec_size
),
3445 fs_inst
*mul
= ibld
.MUL(acc
, inst
->src
[0], inst
->src
[1]);
3446 fs_inst
*mach
= ibld
.MACH(inst
->dst
, inst
->src
[0], inst
->src
[1]);
3448 if (devinfo
->gen
>= 8) {
3449 /* Until Gen8, integer multiplies read 32-bits from one source,
3450 * and 16-bits from the other, and relying on the MACH instruction
3451 * to generate the high bits of the result.
3453 * On Gen8, the multiply instruction does a full 32x32-bit
3454 * multiply, but in order to do a 64-bit multiply we can simulate
3455 * the previous behavior and then use a MACH instruction.
3457 * FINISHME: Don't use source modifiers on src1.
3459 assert(mul
->src
[1].type
== BRW_REGISTER_TYPE_D
||
3460 mul
->src
[1].type
== BRW_REGISTER_TYPE_UD
);
3461 mul
->src
[1].type
= BRW_REGISTER_TYPE_UW
;
3462 mul
->src
[1].stride
*= 2;
3464 } else if (devinfo
->gen
== 7 && !devinfo
->is_haswell
&&
3465 inst
->force_sechalf
) {
3466 /* Among other things the quarter control bits influence which
3467 * accumulator register is used by the hardware for instructions
3468 * that access the accumulator implicitly (e.g. MACH). A
3469 * second-half instruction would normally map to acc1, which
3470 * doesn't exist on Gen7 and up (the hardware does emulate it for
3471 * floating-point instructions *only* by taking advantage of the
3472 * extra precision of acc0 not normally used for floating point
3475 * HSW and up are careful enough not to try to access an
3476 * accumulator register that doesn't exist, but on earlier Gen7
3477 * hardware we need to make sure that the quarter control bits are
3478 * zero to avoid non-deterministic behaviour and emit an extra MOV
3479 * to get the result masked correctly according to the current
3482 mach
->force_sechalf
= false;
3483 mach
->force_writemask_all
= true;
3484 mach
->dst
= ibld
.vgrf(inst
->dst
.type
);
3485 ibld
.MOV(inst
->dst
, mach
->dst
);
3491 inst
->remove(block
);
3496 invalidate_live_intervals();
3502 fs_visitor::lower_minmax()
3504 assert(devinfo
->gen
< 6);
3506 bool progress
= false;
3508 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3509 const fs_builder
ibld(this, block
, inst
);
3511 if (inst
->opcode
== BRW_OPCODE_SEL
&&
3512 inst
->predicate
== BRW_PREDICATE_NONE
) {
3513 /* FIXME: Using CMP doesn't preserve the NaN propagation semantics of
3514 * the original SEL.L/GE instruction
3516 ibld
.CMP(ibld
.null_reg_d(), inst
->src
[0], inst
->src
[1],
3517 inst
->conditional_mod
);
3518 inst
->predicate
= BRW_PREDICATE_NORMAL
;
3519 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
3526 invalidate_live_intervals();
3532 setup_color_payload(const fs_builder
&bld
, const brw_wm_prog_key
*key
,
3533 fs_reg
*dst
, fs_reg color
, unsigned components
)
3535 if (key
->clamp_fragment_color
) {
3536 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 4);
3537 assert(color
.type
== BRW_REGISTER_TYPE_F
);
3539 for (unsigned i
= 0; i
< components
; i
++)
3541 bld
.MOV(offset(tmp
, bld
, i
), offset(color
, bld
, i
)));
3546 for (unsigned i
= 0; i
< components
; i
++)
3547 dst
[i
] = offset(color
, bld
, i
);
3551 lower_fb_write_logical_send(const fs_builder
&bld
, fs_inst
*inst
,
3552 const brw_wm_prog_data
*prog_data
,
3553 const brw_wm_prog_key
*key
,
3554 const fs_visitor::thread_payload
&payload
)
3556 assert(inst
->src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].file
== IMM
);
3557 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
3558 const fs_reg
&color0
= inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR0
];
3559 const fs_reg
&color1
= inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR1
];
3560 const fs_reg
&src0_alpha
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC0_ALPHA
];
3561 const fs_reg
&src_depth
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_DEPTH
];
3562 const fs_reg
&dst_depth
= inst
->src
[FB_WRITE_LOGICAL_SRC_DST_DEPTH
];
3563 const fs_reg
&src_stencil
= inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_STENCIL
];
3564 fs_reg sample_mask
= inst
->src
[FB_WRITE_LOGICAL_SRC_OMASK
];
3565 const unsigned components
=
3566 inst
->src
[FB_WRITE_LOGICAL_SRC_COMPONENTS
].ud
;
3568 /* We can potentially have a message length of up to 15, so we have to set
3569 * base_mrf to either 0 or 1 in order to fit in m0..m15.
3572 int header_size
= 2, payload_header_size
;
3573 unsigned length
= 0;
3575 /* From the Sandy Bridge PRM, volume 4, page 198:
3577 * "Dispatched Pixel Enables. One bit per pixel indicating
3578 * which pixels were originally enabled when the thread was
3579 * dispatched. This field is only required for the end-of-
3580 * thread message and on all dual-source messages."
3582 if (devinfo
->gen
>= 6 &&
3583 (devinfo
->is_haswell
|| devinfo
->gen
>= 8 || !prog_data
->uses_kill
) &&
3584 color1
.file
== BAD_FILE
&&
3585 key
->nr_color_regions
== 1) {
3589 if (header_size
!= 0) {
3590 assert(header_size
== 2);
3591 /* Allocate 2 registers for a header */
3595 if (payload
.aa_dest_stencil_reg
) {
3596 sources
[length
] = fs_reg(VGRF
, bld
.shader
->alloc
.allocate(1));
3597 bld
.group(8, 0).exec_all().annotate("FB write stencil/AA alpha")
3598 .MOV(sources
[length
],
3599 fs_reg(brw_vec8_grf(payload
.aa_dest_stencil_reg
, 0)));
3603 if (prog_data
->uses_omask
) {
3604 sources
[length
] = fs_reg(VGRF
, bld
.shader
->alloc
.allocate(1),
3605 BRW_REGISTER_TYPE_UD
);
3607 /* Hand over gl_SampleMask. Only the lower 16 bits of each channel are
3608 * relevant. Since it's unsigned single words one vgrf is always
3609 * 16-wide, but only the lower or higher 8 channels will be used by the
3610 * hardware when doing a SIMD8 write depending on whether we have
3611 * selected the subspans for the first or second half respectively.
3613 assert(sample_mask
.file
!= BAD_FILE
&& type_sz(sample_mask
.type
) == 4);
3614 sample_mask
.type
= BRW_REGISTER_TYPE_UW
;
3615 sample_mask
.stride
*= 2;
3617 bld
.exec_all().annotate("FB write oMask")
3618 .MOV(half(retype(sources
[length
], BRW_REGISTER_TYPE_UW
),
3619 inst
->force_sechalf
),
3624 payload_header_size
= length
;
3626 if (src0_alpha
.file
!= BAD_FILE
) {
3627 /* FIXME: This is being passed at the wrong location in the payload and
3628 * doesn't work when gl_SampleMask and MRTs are used simultaneously.
3629 * It's supposed to be immediately before oMask but there seems to be no
3630 * reasonable way to pass them in the correct order because LOAD_PAYLOAD
3631 * requires header sources to form a contiguous segment at the beginning
3632 * of the message and src0_alpha has per-channel semantics.
3634 setup_color_payload(bld
, key
, &sources
[length
], src0_alpha
, 1);
3638 setup_color_payload(bld
, key
, &sources
[length
], color0
, components
);
3641 if (color1
.file
!= BAD_FILE
) {
3642 setup_color_payload(bld
, key
, &sources
[length
], color1
, components
);
3646 if (src_depth
.file
!= BAD_FILE
) {
3647 sources
[length
] = src_depth
;
3651 if (dst_depth
.file
!= BAD_FILE
) {
3652 sources
[length
] = dst_depth
;
3656 if (src_stencil
.file
!= BAD_FILE
) {
3657 assert(devinfo
->gen
>= 9);
3658 assert(bld
.dispatch_width() != 16);
3660 /* XXX: src_stencil is only available on gen9+. dst_depth is never
3661 * available on gen9+. As such it's impossible to have both enabled at the
3662 * same time and therefore length cannot overrun the array.
3664 assert(length
< 15);
3666 sources
[length
] = bld
.vgrf(BRW_REGISTER_TYPE_UD
);
3667 bld
.exec_all().annotate("FB write OS")
3668 .emit(FS_OPCODE_PACK_STENCIL_REF
, sources
[length
],
3669 retype(src_stencil
, BRW_REGISTER_TYPE_UB
));
3674 if (devinfo
->gen
>= 7) {
3675 /* Send from the GRF */
3676 fs_reg payload
= fs_reg(VGRF
, -1, BRW_REGISTER_TYPE_F
);
3677 load
= bld
.LOAD_PAYLOAD(payload
, sources
, length
, payload_header_size
);
3678 payload
.nr
= bld
.shader
->alloc
.allocate(load
->regs_written
);
3679 load
->dst
= payload
;
3681 inst
->src
[0] = payload
;
3682 inst
->resize_sources(1);
3683 inst
->base_mrf
= -1;
3685 /* Send from the MRF */
3686 load
= bld
.LOAD_PAYLOAD(fs_reg(MRF
, 1, BRW_REGISTER_TYPE_F
),
3687 sources
, length
, payload_header_size
);
3689 /* On pre-SNB, we have to interlace the color values. LOAD_PAYLOAD
3690 * will do this for us if we just give it a COMPR4 destination.
3692 if (devinfo
->gen
< 6 && bld
.dispatch_width() == 16)
3693 load
->dst
.nr
|= BRW_MRF_COMPR4
;
3695 inst
->resize_sources(0);
3699 inst
->opcode
= FS_OPCODE_FB_WRITE
;
3700 inst
->mlen
= load
->regs_written
;
3701 inst
->header_size
= header_size
;
3705 lower_sampler_logical_send_gen4(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3706 const fs_reg
&coordinate
,
3707 const fs_reg
&shadow_c
,
3708 const fs_reg
&lod
, const fs_reg
&lod2
,
3709 const fs_reg
&surface
,
3710 const fs_reg
&sampler
,
3711 unsigned coord_components
,
3712 unsigned grad_components
)
3714 const bool has_lod
= (op
== SHADER_OPCODE_TXL
|| op
== FS_OPCODE_TXB
||
3715 op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
);
3716 fs_reg
msg_begin(MRF
, 1, BRW_REGISTER_TYPE_F
);
3717 fs_reg msg_end
= msg_begin
;
3720 msg_end
= offset(msg_end
, bld
.group(8, 0), 1);
3722 for (unsigned i
= 0; i
< coord_components
; i
++)
3723 bld
.MOV(retype(offset(msg_end
, bld
, i
), coordinate
.type
),
3724 offset(coordinate
, bld
, i
));
3726 msg_end
= offset(msg_end
, bld
, coord_components
);
3728 /* Messages other than SAMPLE and RESINFO in SIMD16 and TXD in SIMD8
3729 * require all three components to be present and zero if they are unused.
3731 if (coord_components
> 0 &&
3732 (has_lod
|| shadow_c
.file
!= BAD_FILE
||
3733 (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8))) {
3734 for (unsigned i
= coord_components
; i
< 3; i
++)
3735 bld
.MOV(offset(msg_end
, bld
, i
), brw_imm_f(0.0f
));
3737 msg_end
= offset(msg_end
, bld
, 3 - coord_components
);
3740 if (op
== SHADER_OPCODE_TXD
) {
3741 /* TXD unsupported in SIMD16 mode. */
3742 assert(bld
.dispatch_width() == 8);
3744 /* the slots for u and v are always present, but r is optional */
3745 if (coord_components
< 2)
3746 msg_end
= offset(msg_end
, bld
, 2 - coord_components
);
3749 * dPdx = dudx, dvdx, drdx
3750 * dPdy = dudy, dvdy, drdy
3752 * 1-arg: Does not exist.
3754 * 2-arg: dudx dvdx dudy dvdy
3755 * dPdx.x dPdx.y dPdy.x dPdy.y
3758 * 3-arg: dudx dvdx drdx dudy dvdy drdy
3759 * dPdx.x dPdx.y dPdx.z dPdy.x dPdy.y dPdy.z
3760 * m5 m6 m7 m8 m9 m10
3762 for (unsigned i
= 0; i
< grad_components
; i
++)
3763 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod
, bld
, i
));
3765 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
3767 for (unsigned i
= 0; i
< grad_components
; i
++)
3768 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod2
, bld
, i
));
3770 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
3774 /* Bias/LOD with shadow comparitor is unsupported in SIMD16 -- *Without*
3775 * shadow comparitor (including RESINFO) it's unsupported in SIMD8 mode.
3777 assert(shadow_c
.file
!= BAD_FILE
? bld
.dispatch_width() == 8 :
3778 bld
.dispatch_width() == 16);
3780 const brw_reg_type type
=
3781 (op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
?
3782 BRW_REGISTER_TYPE_UD
: BRW_REGISTER_TYPE_F
);
3783 bld
.MOV(retype(msg_end
, type
), lod
);
3784 msg_end
= offset(msg_end
, bld
, 1);
3787 if (shadow_c
.file
!= BAD_FILE
) {
3788 if (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8) {
3789 /* There's no plain shadow compare message, so we use shadow
3790 * compare with a bias of 0.0.
3792 bld
.MOV(msg_end
, brw_imm_f(0.0f
));
3793 msg_end
= offset(msg_end
, bld
, 1);
3796 bld
.MOV(msg_end
, shadow_c
);
3797 msg_end
= offset(msg_end
, bld
, 1);
3801 inst
->src
[0] = reg_undef
;
3802 inst
->src
[1] = surface
;
3803 inst
->src
[2] = sampler
;
3804 inst
->resize_sources(3);
3805 inst
->base_mrf
= msg_begin
.nr
;
3806 inst
->mlen
= msg_end
.nr
- msg_begin
.nr
;
3807 inst
->header_size
= 1;
3811 lower_sampler_logical_send_gen5(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3813 const fs_reg
&shadow_c
,
3814 fs_reg lod
, fs_reg lod2
,
3815 const fs_reg
&sample_index
,
3816 const fs_reg
&surface
,
3817 const fs_reg
&sampler
,
3818 const fs_reg
&offset_value
,
3819 unsigned coord_components
,
3820 unsigned grad_components
)
3822 fs_reg
message(MRF
, 2, BRW_REGISTER_TYPE_F
);
3823 fs_reg msg_coords
= message
;
3824 unsigned header_size
= 0;
3826 if (offset_value
.file
!= BAD_FILE
) {
3827 /* The offsets set up by the visitor are in the m1 header, so we can't
3834 for (unsigned i
= 0; i
< coord_components
; i
++) {
3835 bld
.MOV(retype(offset(msg_coords
, bld
, i
), coordinate
.type
), coordinate
);
3836 coordinate
= offset(coordinate
, bld
, 1);
3838 fs_reg msg_end
= offset(msg_coords
, bld
, coord_components
);
3839 fs_reg msg_lod
= offset(msg_coords
, bld
, 4);
3841 if (shadow_c
.file
!= BAD_FILE
) {
3842 fs_reg msg_shadow
= msg_lod
;
3843 bld
.MOV(msg_shadow
, shadow_c
);
3844 msg_lod
= offset(msg_shadow
, bld
, 1);
3849 case SHADER_OPCODE_TXL
:
3851 bld
.MOV(msg_lod
, lod
);
3852 msg_end
= offset(msg_lod
, bld
, 1);
3854 case SHADER_OPCODE_TXD
:
3857 * dPdx = dudx, dvdx, drdx
3858 * dPdy = dudy, dvdy, drdy
3860 * Load up these values:
3861 * - dudx dudy dvdx dvdy drdx drdy
3862 * - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z
3865 for (unsigned i
= 0; i
< grad_components
; i
++) {
3866 bld
.MOV(msg_end
, lod
);
3867 lod
= offset(lod
, bld
, 1);
3868 msg_end
= offset(msg_end
, bld
, 1);
3870 bld
.MOV(msg_end
, lod2
);
3871 lod2
= offset(lod2
, bld
, 1);
3872 msg_end
= offset(msg_end
, bld
, 1);
3875 case SHADER_OPCODE_TXS
:
3876 msg_lod
= retype(msg_end
, BRW_REGISTER_TYPE_UD
);
3877 bld
.MOV(msg_lod
, lod
);
3878 msg_end
= offset(msg_lod
, bld
, 1);
3880 case SHADER_OPCODE_TXF
:
3881 msg_lod
= offset(msg_coords
, bld
, 3);
3882 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), lod
);
3883 msg_end
= offset(msg_lod
, bld
, 1);
3885 case SHADER_OPCODE_TXF_CMS
:
3886 msg_lod
= offset(msg_coords
, bld
, 3);
3888 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), brw_imm_ud(0u));
3890 bld
.MOV(retype(offset(msg_lod
, bld
, 1), BRW_REGISTER_TYPE_UD
), sample_index
);
3891 msg_end
= offset(msg_lod
, bld
, 2);
3898 inst
->src
[0] = reg_undef
;
3899 inst
->src
[1] = surface
;
3900 inst
->src
[2] = sampler
;
3901 inst
->resize_sources(3);
3902 inst
->base_mrf
= message
.nr
;
3903 inst
->mlen
= msg_end
.nr
- message
.nr
;
3904 inst
->header_size
= header_size
;
3906 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
3907 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
3911 is_high_sampler(const struct brw_device_info
*devinfo
, const fs_reg
&sampler
)
3913 if (devinfo
->gen
< 8 && !devinfo
->is_haswell
)
3916 return sampler
.file
!= IMM
|| sampler
.ud
>= 16;
3920 lower_sampler_logical_send_gen7(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3922 const fs_reg
&shadow_c
,
3923 fs_reg lod
, fs_reg lod2
,
3924 const fs_reg
&sample_index
,
3926 const fs_reg
&surface
,
3927 const fs_reg
&sampler
,
3928 fs_reg offset_value
,
3929 unsigned coord_components
,
3930 unsigned grad_components
)
3932 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
3933 int reg_width
= bld
.dispatch_width() / 8;
3934 unsigned header_size
= 0, length
= 0;
3935 fs_reg sources
[MAX_SAMPLER_MESSAGE_SIZE
];
3936 for (unsigned i
= 0; i
< ARRAY_SIZE(sources
); i
++)
3937 sources
[i
] = bld
.vgrf(BRW_REGISTER_TYPE_F
);
3939 if (op
== SHADER_OPCODE_TG4
|| op
== SHADER_OPCODE_TG4_OFFSET
||
3940 offset_value
.file
!= BAD_FILE
||
3941 is_high_sampler(devinfo
, sampler
)) {
3942 /* For general texture offsets (no txf workaround), we need a header to
3943 * put them in. Note that we're only reserving space for it in the
3944 * message payload as it will be initialized implicitly by the
3947 * TG4 needs to place its channel select in the header, for interaction
3948 * with ARB_texture_swizzle. The sampler index is only 4-bits, so for
3949 * larger sampler numbers we need to offset the Sampler State Pointer in
3953 sources
[0] = fs_reg();
3957 if (shadow_c
.file
!= BAD_FILE
) {
3958 bld
.MOV(sources
[length
], shadow_c
);
3962 bool coordinate_done
= false;
3964 /* The sampler can only meaningfully compute LOD for fragment shader
3965 * messages. For all other stages, we change the opcode to TXL and
3966 * hardcode the LOD to 0.
3968 if (bld
.shader
->stage
!= MESA_SHADER_FRAGMENT
&&
3969 op
== SHADER_OPCODE_TEX
) {
3970 op
= SHADER_OPCODE_TXL
;
3971 lod
= brw_imm_f(0.0f
);
3974 /* Set up the LOD info */
3977 case SHADER_OPCODE_TXL
:
3978 bld
.MOV(sources
[length
], lod
);
3981 case SHADER_OPCODE_TXD
:
3982 /* TXD should have been lowered in SIMD16 mode. */
3983 assert(bld
.dispatch_width() == 8);
3985 /* Load dPdx and the coordinate together:
3986 * [hdr], [ref], x, dPdx.x, dPdy.x, y, dPdx.y, dPdy.y, z, dPdx.z, dPdy.z
3988 for (unsigned i
= 0; i
< coord_components
; i
++) {
3989 bld
.MOV(sources
[length
], coordinate
);
3990 coordinate
= offset(coordinate
, bld
, 1);
3993 /* For cube map array, the coordinate is (u,v,r,ai) but there are
3994 * only derivatives for (u, v, r).
3996 if (i
< grad_components
) {
3997 bld
.MOV(sources
[length
], lod
);
3998 lod
= offset(lod
, bld
, 1);
4001 bld
.MOV(sources
[length
], lod2
);
4002 lod2
= offset(lod2
, bld
, 1);
4007 coordinate_done
= true;
4009 case SHADER_OPCODE_TXS
:
4010 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), lod
);
4013 case SHADER_OPCODE_TXF
:
4014 /* Unfortunately, the parameters for LD are intermixed: u, lod, v, r.
4015 * On Gen9 they are u, v, lod, r
4017 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
4018 coordinate
= offset(coordinate
, bld
, 1);
4021 if (devinfo
->gen
>= 9) {
4022 if (coord_components
>= 2) {
4023 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
4024 coordinate
= offset(coordinate
, bld
, 1);
4029 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), lod
);
4032 for (unsigned i
= devinfo
->gen
>= 9 ? 2 : 1; i
< coord_components
; i
++) {
4033 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
4034 coordinate
= offset(coordinate
, bld
, 1);
4038 coordinate_done
= true;
4040 case SHADER_OPCODE_TXF_CMS
:
4041 case SHADER_OPCODE_TXF_CMS_W
:
4042 case SHADER_OPCODE_TXF_UMS
:
4043 case SHADER_OPCODE_TXF_MCS
:
4044 if (op
== SHADER_OPCODE_TXF_UMS
||
4045 op
== SHADER_OPCODE_TXF_CMS
||
4046 op
== SHADER_OPCODE_TXF_CMS_W
) {
4047 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), sample_index
);
4051 if (op
== SHADER_OPCODE_TXF_CMS
|| op
== SHADER_OPCODE_TXF_CMS_W
) {
4052 /* Data from the multisample control surface. */
4053 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), mcs
);
4056 /* On Gen9+ we'll use ld2dms_w instead which has two registers for
4059 if (op
== SHADER_OPCODE_TXF_CMS_W
) {
4060 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
),
4063 offset(mcs
, bld
, 1));
4068 /* There is no offsetting for this message; just copy in the integer
4069 * texture coordinates.
4071 for (unsigned i
= 0; i
< coord_components
; i
++) {
4072 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
4073 coordinate
= offset(coordinate
, bld
, 1);
4077 coordinate_done
= true;
4079 case SHADER_OPCODE_TG4_OFFSET
:
4080 /* gather4_po_c should have been lowered in SIMD16 mode. */
4081 assert(bld
.dispatch_width() == 8 || shadow_c
.file
== BAD_FILE
);
4083 /* More crazy intermixing */
4084 for (unsigned i
= 0; i
< 2; i
++) { /* u, v */
4085 bld
.MOV(sources
[length
], coordinate
);
4086 coordinate
= offset(coordinate
, bld
, 1);
4090 for (unsigned i
= 0; i
< 2; i
++) { /* offu, offv */
4091 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), offset_value
);
4092 offset_value
= offset(offset_value
, bld
, 1);
4096 if (coord_components
== 3) { /* r if present */
4097 bld
.MOV(sources
[length
], coordinate
);
4098 coordinate
= offset(coordinate
, bld
, 1);
4102 coordinate_done
= true;
4108 /* Set up the coordinate (except for cases where it was done above) */
4109 if (!coordinate_done
) {
4110 for (unsigned i
= 0; i
< coord_components
; i
++) {
4111 bld
.MOV(sources
[length
], coordinate
);
4112 coordinate
= offset(coordinate
, bld
, 1);
4119 mlen
= length
* reg_width
- header_size
;
4121 mlen
= length
* reg_width
;
4123 const fs_reg src_payload
= fs_reg(VGRF
, bld
.shader
->alloc
.allocate(mlen
),
4124 BRW_REGISTER_TYPE_F
);
4125 bld
.LOAD_PAYLOAD(src_payload
, sources
, length
, header_size
);
4127 /* Generate the SEND. */
4129 inst
->src
[0] = src_payload
;
4130 inst
->src
[1] = surface
;
4131 inst
->src
[2] = sampler
;
4132 inst
->resize_sources(3);
4133 inst
->base_mrf
= -1;
4135 inst
->header_size
= header_size
;
4137 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
4138 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
4142 lower_sampler_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
)
4144 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
4145 const fs_reg
&coordinate
= inst
->src
[TEX_LOGICAL_SRC_COORDINATE
];
4146 const fs_reg
&shadow_c
= inst
->src
[TEX_LOGICAL_SRC_SHADOW_C
];
4147 const fs_reg
&lod
= inst
->src
[TEX_LOGICAL_SRC_LOD
];
4148 const fs_reg
&lod2
= inst
->src
[TEX_LOGICAL_SRC_LOD2
];
4149 const fs_reg
&sample_index
= inst
->src
[TEX_LOGICAL_SRC_SAMPLE_INDEX
];
4150 const fs_reg
&mcs
= inst
->src
[TEX_LOGICAL_SRC_MCS
];
4151 const fs_reg
&surface
= inst
->src
[TEX_LOGICAL_SRC_SURFACE
];
4152 const fs_reg
&sampler
= inst
->src
[TEX_LOGICAL_SRC_SAMPLER
];
4153 const fs_reg
&offset_value
= inst
->src
[TEX_LOGICAL_SRC_OFFSET_VALUE
];
4154 assert(inst
->src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].file
== IMM
);
4155 const unsigned coord_components
= inst
->src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].ud
;
4156 assert(inst
->src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].file
== IMM
);
4157 const unsigned grad_components
= inst
->src
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
].ud
;
4159 if (devinfo
->gen
>= 7) {
4160 lower_sampler_logical_send_gen7(bld
, inst
, op
, coordinate
,
4161 shadow_c
, lod
, lod2
, sample_index
,
4162 mcs
, surface
, sampler
, offset_value
,
4163 coord_components
, grad_components
);
4164 } else if (devinfo
->gen
>= 5) {
4165 lower_sampler_logical_send_gen5(bld
, inst
, op
, coordinate
,
4166 shadow_c
, lod
, lod2
, sample_index
,
4167 surface
, sampler
, offset_value
,
4168 coord_components
, grad_components
);
4170 lower_sampler_logical_send_gen4(bld
, inst
, op
, coordinate
,
4171 shadow_c
, lod
, lod2
,
4173 coord_components
, grad_components
);
4178 * Initialize the header present in some typed and untyped surface
4182 emit_surface_header(const fs_builder
&bld
, const fs_reg
&sample_mask
)
4184 fs_builder ubld
= bld
.exec_all().group(8, 0);
4185 const fs_reg dst
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
4186 ubld
.MOV(dst
, brw_imm_d(0));
4187 ubld
.MOV(component(dst
, 7), sample_mask
);
4192 lower_surface_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
4193 const fs_reg
&sample_mask
)
4195 /* Get the logical send arguments. */
4196 const fs_reg
&addr
= inst
->src
[0];
4197 const fs_reg
&src
= inst
->src
[1];
4198 const fs_reg
&surface
= inst
->src
[2];
4199 const UNUSED fs_reg
&dims
= inst
->src
[3];
4200 const fs_reg
&arg
= inst
->src
[4];
4202 /* Calculate the total number of components of the payload. */
4203 const unsigned addr_sz
= inst
->components_read(0);
4204 const unsigned src_sz
= inst
->components_read(1);
4205 const unsigned header_sz
= (sample_mask
.file
== BAD_FILE
? 0 : 1);
4206 const unsigned sz
= header_sz
+ addr_sz
+ src_sz
;
4208 /* Allocate space for the payload. */
4209 fs_reg
*const components
= new fs_reg
[sz
];
4210 const fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, sz
);
4213 /* Construct the payload. */
4215 components
[n
++] = emit_surface_header(bld
, sample_mask
);
4217 for (unsigned i
= 0; i
< addr_sz
; i
++)
4218 components
[n
++] = offset(addr
, bld
, i
);
4220 for (unsigned i
= 0; i
< src_sz
; i
++)
4221 components
[n
++] = offset(src
, bld
, i
);
4223 bld
.LOAD_PAYLOAD(payload
, components
, sz
, header_sz
);
4225 /* Update the original instruction. */
4227 inst
->mlen
= header_sz
+ (addr_sz
+ src_sz
) * inst
->exec_size
/ 8;
4228 inst
->header_size
= header_sz
;
4230 inst
->src
[0] = payload
;
4231 inst
->src
[1] = surface
;
4233 inst
->resize_sources(3);
4235 delete[] components
;
4239 fs_visitor::lower_logical_sends()
4241 bool progress
= false;
4243 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
4244 const fs_builder
ibld(this, block
, inst
);
4246 switch (inst
->opcode
) {
4247 case FS_OPCODE_FB_WRITE_LOGICAL
:
4248 assert(stage
== MESA_SHADER_FRAGMENT
);
4249 lower_fb_write_logical_send(ibld
, inst
,
4250 (const brw_wm_prog_data
*)prog_data
,
4251 (const brw_wm_prog_key
*)key
,
4255 case SHADER_OPCODE_TEX_LOGICAL
:
4256 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TEX
);
4259 case SHADER_OPCODE_TXD_LOGICAL
:
4260 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXD
);
4263 case SHADER_OPCODE_TXF_LOGICAL
:
4264 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF
);
4267 case SHADER_OPCODE_TXL_LOGICAL
:
4268 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXL
);
4271 case SHADER_OPCODE_TXS_LOGICAL
:
4272 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXS
);
4275 case FS_OPCODE_TXB_LOGICAL
:
4276 lower_sampler_logical_send(ibld
, inst
, FS_OPCODE_TXB
);
4279 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
4280 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_CMS
);
4283 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
4284 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_CMS_W
);
4287 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
4288 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_UMS
);
4291 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
4292 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_MCS
);
4295 case SHADER_OPCODE_LOD_LOGICAL
:
4296 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_LOD
);
4299 case SHADER_OPCODE_TG4_LOGICAL
:
4300 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4
);
4303 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
4304 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4_OFFSET
);
4307 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
4308 lower_surface_logical_send(ibld
, inst
,
4309 SHADER_OPCODE_UNTYPED_SURFACE_READ
,
4313 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
4314 lower_surface_logical_send(ibld
, inst
,
4315 SHADER_OPCODE_UNTYPED_SURFACE_WRITE
,
4316 ibld
.sample_mask_reg());
4319 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
4320 lower_surface_logical_send(ibld
, inst
,
4321 SHADER_OPCODE_UNTYPED_ATOMIC
,
4322 ibld
.sample_mask_reg());
4325 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
4326 lower_surface_logical_send(ibld
, inst
,
4327 SHADER_OPCODE_TYPED_SURFACE_READ
,
4331 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
4332 lower_surface_logical_send(ibld
, inst
,
4333 SHADER_OPCODE_TYPED_SURFACE_WRITE
,
4334 ibld
.sample_mask_reg());
4337 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
4338 lower_surface_logical_send(ibld
, inst
,
4339 SHADER_OPCODE_TYPED_ATOMIC
,
4340 ibld
.sample_mask_reg());
4351 invalidate_live_intervals();
4357 * Get the closest native SIMD width supported by the hardware for instruction
4358 * \p inst. The instruction will be left untouched by
4359 * fs_visitor::lower_simd_width() if the returned value is equal to the
4360 * original execution size.
4363 get_lowered_simd_width(const struct brw_device_info
*devinfo
,
4364 const fs_inst
*inst
)
4366 switch (inst
->opcode
) {
4367 case BRW_OPCODE_MOV
:
4368 case BRW_OPCODE_SEL
:
4369 case BRW_OPCODE_NOT
:
4370 case BRW_OPCODE_AND
:
4372 case BRW_OPCODE_XOR
:
4373 case BRW_OPCODE_SHR
:
4374 case BRW_OPCODE_SHL
:
4375 case BRW_OPCODE_ASR
:
4376 case BRW_OPCODE_CMP
:
4377 case BRW_OPCODE_CMPN
:
4378 case BRW_OPCODE_CSEL
:
4379 case BRW_OPCODE_F32TO16
:
4380 case BRW_OPCODE_F16TO32
:
4381 case BRW_OPCODE_BFREV
:
4382 case BRW_OPCODE_BFE
:
4383 case BRW_OPCODE_BFI1
:
4384 case BRW_OPCODE_BFI2
:
4385 case BRW_OPCODE_ADD
:
4386 case BRW_OPCODE_MUL
:
4387 case BRW_OPCODE_AVG
:
4388 case BRW_OPCODE_FRC
:
4389 case BRW_OPCODE_RNDU
:
4390 case BRW_OPCODE_RNDD
:
4391 case BRW_OPCODE_RNDE
:
4392 case BRW_OPCODE_RNDZ
:
4393 case BRW_OPCODE_LZD
:
4394 case BRW_OPCODE_FBH
:
4395 case BRW_OPCODE_FBL
:
4396 case BRW_OPCODE_CBIT
:
4397 case BRW_OPCODE_SAD2
:
4398 case BRW_OPCODE_MAD
:
4399 case BRW_OPCODE_LRP
:
4400 case SHADER_OPCODE_RCP
:
4401 case SHADER_OPCODE_RSQ
:
4402 case SHADER_OPCODE_SQRT
:
4403 case SHADER_OPCODE_EXP2
:
4404 case SHADER_OPCODE_LOG2
:
4405 case SHADER_OPCODE_POW
:
4406 case SHADER_OPCODE_INT_QUOTIENT
:
4407 case SHADER_OPCODE_INT_REMAINDER
:
4408 case SHADER_OPCODE_SIN
:
4409 case SHADER_OPCODE_COS
: {
4410 /* According to the PRMs:
4411 * "A. In Direct Addressing mode, a source cannot span more than 2
4412 * adjacent GRF registers.
4413 * B. A destination cannot span more than 2 adjacent GRF registers."
4415 * Look for the source or destination with the largest register region
4416 * which is the one that is going to limit the overal execution size of
4417 * the instruction due to this rule.
4419 unsigned reg_count
= inst
->regs_written
;
4421 for (unsigned i
= 0; i
< inst
->sources
; i
++)
4422 reg_count
= MAX2(reg_count
, (unsigned)inst
->regs_read(i
));
4424 /* Calculate the maximum execution size of the instruction based on the
4425 * factor by which it goes over the hardware limit of 2 GRFs.
4427 return inst
->exec_size
/ DIV_ROUND_UP(reg_count
, 2);
4429 case SHADER_OPCODE_MULH
:
4430 /* MULH is lowered to the MUL/MACH sequence using the accumulator, which
4431 * is 8-wide on Gen7+.
4433 return (devinfo
->gen
>= 7 ? 8 : inst
->exec_size
);
4435 case FS_OPCODE_FB_WRITE_LOGICAL
:
4436 /* Gen6 doesn't support SIMD16 depth writes but we cannot handle them
4439 assert(devinfo
->gen
!= 6 ||
4440 inst
->src
[FB_WRITE_LOGICAL_SRC_SRC_DEPTH
].file
== BAD_FILE
||
4441 inst
->exec_size
== 8);
4442 /* Dual-source FB writes are unsupported in SIMD16 mode. */
4443 return (inst
->src
[FB_WRITE_LOGICAL_SRC_COLOR1
].file
!= BAD_FILE
?
4444 8 : inst
->exec_size
);
4446 case SHADER_OPCODE_TXD_LOGICAL
:
4447 /* TXD is unsupported in SIMD16 mode. */
4450 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
: {
4451 /* gather4_po_c is unsupported in SIMD16 mode. */
4452 const fs_reg
&shadow_c
= inst
->src
[TEX_LOGICAL_SRC_SHADOW_C
];
4453 return (shadow_c
.file
!= BAD_FILE
? 8 : inst
->exec_size
);
4455 case SHADER_OPCODE_TXL_LOGICAL
:
4456 case FS_OPCODE_TXB_LOGICAL
: {
4457 /* Gen4 doesn't have SIMD8 non-shadow-compare bias/LOD instructions, and
4458 * Gen4-6 can't support TXL and TXB with shadow comparison in SIMD16
4459 * mode because the message exceeds the maximum length of 11.
4461 const fs_reg
&shadow_c
= inst
->src
[TEX_LOGICAL_SRC_SHADOW_C
];
4462 if (devinfo
->gen
== 4 && shadow_c
.file
== BAD_FILE
)
4464 else if (devinfo
->gen
< 7 && shadow_c
.file
!= BAD_FILE
)
4467 return inst
->exec_size
;
4469 case SHADER_OPCODE_TXF_LOGICAL
:
4470 case SHADER_OPCODE_TXS_LOGICAL
:
4471 /* Gen4 doesn't have SIMD8 variants for the RESINFO and LD-with-LOD
4472 * messages. Use SIMD16 instead.
4474 if (devinfo
->gen
== 4)
4477 return inst
->exec_size
;
4479 case SHADER_OPCODE_TXF_CMS_W_LOGICAL
: {
4480 /* This opcode can take up to 6 arguments which means that in some
4481 * circumstances it can end up with a message that is too long in SIMD16
4484 const unsigned coord_components
=
4485 inst
->src
[TEX_LOGICAL_SRC_COORD_COMPONENTS
].ud
;
4486 /* First three arguments are the sample index and the two arguments for
4489 if ((coord_components
+ 3) * 2 > MAX_SAMPLER_MESSAGE_SIZE
)
4492 return inst
->exec_size
;
4495 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
4496 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
4497 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
4500 case SHADER_OPCODE_MOV_INDIRECT
:
4501 /* Prior to Broadwell, we only have 8 address subregisters */
4502 return devinfo
->gen
< 8 ? 8 : MIN2(inst
->exec_size
, 16);
4505 return inst
->exec_size
;
4510 * The \p rows array of registers represents a \p num_rows by \p num_columns
4511 * matrix in row-major order, write it in column-major order into the register
4512 * passed as destination. \p stride gives the separation between matrix
4513 * elements in the input in fs_builder::dispatch_width() units.
4516 emit_transpose(const fs_builder
&bld
,
4517 const fs_reg
&dst
, const fs_reg
*rows
,
4518 unsigned num_rows
, unsigned num_columns
, unsigned stride
)
4520 fs_reg
*const components
= new fs_reg
[num_rows
* num_columns
];
4522 for (unsigned i
= 0; i
< num_columns
; ++i
) {
4523 for (unsigned j
= 0; j
< num_rows
; ++j
)
4524 components
[num_rows
* i
+ j
] = offset(rows
[j
], bld
, stride
* i
);
4527 bld
.LOAD_PAYLOAD(dst
, components
, num_rows
* num_columns
, 0);
4529 delete[] components
;
4533 fs_visitor::lower_simd_width()
4535 bool progress
= false;
4537 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
4538 const unsigned lower_width
= get_lowered_simd_width(devinfo
, inst
);
4540 if (lower_width
!= inst
->exec_size
) {
4541 /* Builder matching the original instruction. We may also need to
4542 * emit an instruction of width larger than the original, set the
4543 * execution size of the builder to the highest of both for now so
4544 * we're sure that both cases can be handled.
4546 const fs_builder ibld
= bld
.at(block
, inst
)
4547 .exec_all(inst
->force_writemask_all
)
4548 .group(MAX2(inst
->exec_size
, lower_width
),
4549 inst
->force_sechalf
);
4551 /* Split the copies in chunks of the execution width of either the
4552 * original or the lowered instruction, whichever is lower.
4554 const unsigned copy_width
= MIN2(lower_width
, inst
->exec_size
);
4555 const unsigned n
= inst
->exec_size
/ copy_width
;
4556 const unsigned dst_size
= inst
->regs_written
* REG_SIZE
/
4557 inst
->dst
.component_size(inst
->exec_size
);
4560 assert(n
> 0 && n
<= ARRAY_SIZE(dsts
) &&
4561 !inst
->writes_accumulator
&& !inst
->mlen
);
4563 for (unsigned i
= 0; i
< n
; i
++) {
4564 /* Emit a copy of the original instruction with the lowered width.
4565 * If the EOT flag was set throw it away except for the last
4566 * instruction to avoid killing the thread prematurely.
4568 fs_inst split_inst
= *inst
;
4569 split_inst
.exec_size
= lower_width
;
4570 split_inst
.eot
= inst
->eot
&& i
== n
- 1;
4572 /* Select the correct channel enables for the i-th group, then
4573 * transform the sources and destination and emit the lowered
4576 const fs_builder lbld
= ibld
.group(lower_width
, i
);
4578 for (unsigned j
= 0; j
< inst
->sources
; j
++) {
4579 if (inst
->src
[j
].file
!= BAD_FILE
&&
4580 !is_uniform(inst
->src
[j
])) {
4581 /* Get the i-th copy_width-wide chunk of the source. */
4582 const fs_reg src
= horiz_offset(inst
->src
[j
], copy_width
* i
);
4583 const unsigned src_size
= inst
->components_read(j
);
4585 /* Use a trivial transposition to copy one every n
4586 * copy_width-wide components of the register into a
4587 * temporary passed as source to the lowered instruction.
4589 split_inst
.src
[j
] = lbld
.vgrf(inst
->src
[j
].type
, src_size
);
4590 emit_transpose(lbld
.group(copy_width
, 0),
4591 split_inst
.src
[j
], &src
, 1, src_size
, n
);
4595 if (inst
->regs_written
) {
4596 /* Allocate enough space to hold the result of the lowered
4597 * instruction and fix up the number of registers written.
4599 split_inst
.dst
= dsts
[i
] =
4600 lbld
.vgrf(inst
->dst
.type
, dst_size
);
4601 split_inst
.regs_written
=
4602 DIV_ROUND_UP(inst
->regs_written
* lower_width
,
4606 lbld
.emit(split_inst
);
4609 if (inst
->regs_written
) {
4610 /* Distance between useful channels in the temporaries, skipping
4611 * garbage if the lowered instruction is wider than the original.
4613 const unsigned m
= lower_width
/ copy_width
;
4615 /* Interleave the components of the result from the lowered
4616 * instructions. We need to set exec_all() when copying more than
4617 * one half per component, because LOAD_PAYLOAD (in terms of which
4618 * emit_transpose is implemented) can only use the same channel
4619 * enable signals for all of its non-header sources.
4621 emit_transpose(ibld
.exec_all(inst
->exec_size
> copy_width
)
4622 .group(copy_width
, 0),
4623 inst
->dst
, dsts
, n
, dst_size
, m
);
4626 inst
->remove(block
);
4632 invalidate_live_intervals();
4638 fs_visitor::dump_instructions()
4640 dump_instructions(NULL
);
4644 fs_visitor::dump_instructions(const char *name
)
4646 FILE *file
= stderr
;
4647 if (name
&& geteuid() != 0) {
4648 file
= fopen(name
, "w");
4654 calculate_register_pressure();
4655 int ip
= 0, max_pressure
= 0;
4656 foreach_block_and_inst(block
, backend_instruction
, inst
, cfg
) {
4657 max_pressure
= MAX2(max_pressure
, regs_live_at_ip
[ip
]);
4658 fprintf(file
, "{%3d} %4d: ", regs_live_at_ip
[ip
], ip
);
4659 dump_instruction(inst
, file
);
4662 fprintf(file
, "Maximum %3d registers live at once.\n", max_pressure
);
4665 foreach_in_list(backend_instruction
, inst
, &instructions
) {
4666 fprintf(file
, "%4d: ", ip
++);
4667 dump_instruction(inst
, file
);
4671 if (file
!= stderr
) {
4677 fs_visitor::dump_instruction(backend_instruction
*be_inst
)
4679 dump_instruction(be_inst
, stderr
);
4683 fs_visitor::dump_instruction(backend_instruction
*be_inst
, FILE *file
)
4685 fs_inst
*inst
= (fs_inst
*)be_inst
;
4687 if (inst
->predicate
) {
4688 fprintf(file
, "(%cf0.%d) ",
4689 inst
->predicate_inverse
? '-' : '+',
4693 fprintf(file
, "%s", brw_instruction_name(inst
->opcode
));
4695 fprintf(file
, ".sat");
4696 if (inst
->conditional_mod
) {
4697 fprintf(file
, "%s", conditional_modifier
[inst
->conditional_mod
]);
4698 if (!inst
->predicate
&&
4699 (devinfo
->gen
< 5 || (inst
->opcode
!= BRW_OPCODE_SEL
&&
4700 inst
->opcode
!= BRW_OPCODE_IF
&&
4701 inst
->opcode
!= BRW_OPCODE_WHILE
))) {
4702 fprintf(file
, ".f0.%d", inst
->flag_subreg
);
4705 fprintf(file
, "(%d) ", inst
->exec_size
);
4708 fprintf(file
, "(mlen: %d) ", inst
->mlen
);
4711 switch (inst
->dst
.file
) {
4713 fprintf(file
, "vgrf%d", inst
->dst
.nr
);
4714 if (alloc
.sizes
[inst
->dst
.nr
] != inst
->regs_written
||
4715 inst
->dst
.subreg_offset
)
4716 fprintf(file
, "+%d.%d",
4717 inst
->dst
.reg_offset
, inst
->dst
.subreg_offset
);
4720 fprintf(file
, "g%d", inst
->dst
.nr
);
4723 fprintf(file
, "m%d", inst
->dst
.nr
);
4726 fprintf(file
, "(null)");
4729 fprintf(file
, "***u%d***", inst
->dst
.nr
+ inst
->dst
.reg_offset
);
4732 fprintf(file
, "***attr%d***", inst
->dst
.nr
+ inst
->dst
.reg_offset
);
4735 switch (inst
->dst
.nr
) {
4737 fprintf(file
, "null");
4739 case BRW_ARF_ADDRESS
:
4740 fprintf(file
, "a0.%d", inst
->dst
.subnr
);
4742 case BRW_ARF_ACCUMULATOR
:
4743 fprintf(file
, "acc%d", inst
->dst
.subnr
);
4746 fprintf(file
, "f%d.%d", inst
->dst
.nr
& 0xf, inst
->dst
.subnr
);
4749 fprintf(file
, "arf%d.%d", inst
->dst
.nr
& 0xf, inst
->dst
.subnr
);
4752 if (inst
->dst
.subnr
)
4753 fprintf(file
, "+%d", inst
->dst
.subnr
);
4756 unreachable("not reached");
4758 if (inst
->dst
.stride
!= 1)
4759 fprintf(file
, "<%u>", inst
->dst
.stride
);
4760 fprintf(file
, ":%s, ", brw_reg_type_letters(inst
->dst
.type
));
4762 for (int i
= 0; i
< inst
->sources
; i
++) {
4763 if (inst
->src
[i
].negate
)
4765 if (inst
->src
[i
].abs
)
4767 switch (inst
->src
[i
].file
) {
4769 fprintf(file
, "vgrf%d", inst
->src
[i
].nr
);
4770 if (alloc
.sizes
[inst
->src
[i
].nr
] != (unsigned)inst
->regs_read(i
) ||
4771 inst
->src
[i
].subreg_offset
)
4772 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
4773 inst
->src
[i
].subreg_offset
);
4776 fprintf(file
, "g%d", inst
->src
[i
].nr
);
4779 fprintf(file
, "***m%d***", inst
->src
[i
].nr
);
4782 fprintf(file
, "attr%d+%d", inst
->src
[i
].nr
, inst
->src
[i
].reg_offset
);
4785 fprintf(file
, "u%d", inst
->src
[i
].nr
+ inst
->src
[i
].reg_offset
);
4786 if (inst
->src
[i
].reladdr
) {
4787 fprintf(file
, "+reladdr");
4788 } else if (inst
->src
[i
].subreg_offset
) {
4789 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
4790 inst
->src
[i
].subreg_offset
);
4794 fprintf(file
, "(null)");
4797 switch (inst
->src
[i
].type
) {
4798 case BRW_REGISTER_TYPE_F
:
4799 fprintf(file
, "%-gf", inst
->src
[i
].f
);
4801 case BRW_REGISTER_TYPE_W
:
4802 case BRW_REGISTER_TYPE_D
:
4803 fprintf(file
, "%dd", inst
->src
[i
].d
);
4805 case BRW_REGISTER_TYPE_UW
:
4806 case BRW_REGISTER_TYPE_UD
:
4807 fprintf(file
, "%uu", inst
->src
[i
].ud
);
4809 case BRW_REGISTER_TYPE_VF
:
4810 fprintf(file
, "[%-gF, %-gF, %-gF, %-gF]",
4811 brw_vf_to_float((inst
->src
[i
].ud
>> 0) & 0xff),
4812 brw_vf_to_float((inst
->src
[i
].ud
>> 8) & 0xff),
4813 brw_vf_to_float((inst
->src
[i
].ud
>> 16) & 0xff),
4814 brw_vf_to_float((inst
->src
[i
].ud
>> 24) & 0xff));
4817 fprintf(file
, "???");
4822 switch (inst
->src
[i
].nr
) {
4824 fprintf(file
, "null");
4826 case BRW_ARF_ADDRESS
:
4827 fprintf(file
, "a0.%d", inst
->src
[i
].subnr
);
4829 case BRW_ARF_ACCUMULATOR
:
4830 fprintf(file
, "acc%d", inst
->src
[i
].subnr
);
4833 fprintf(file
, "f%d.%d", inst
->src
[i
].nr
& 0xf, inst
->src
[i
].subnr
);
4836 fprintf(file
, "arf%d.%d", inst
->src
[i
].nr
& 0xf, inst
->src
[i
].subnr
);
4839 if (inst
->src
[i
].subnr
)
4840 fprintf(file
, "+%d", inst
->src
[i
].subnr
);
4843 if (inst
->src
[i
].abs
)
4846 if (inst
->src
[i
].file
!= IMM
) {
4848 if (inst
->src
[i
].file
== ARF
|| inst
->src
[i
].file
== FIXED_GRF
) {
4849 unsigned hstride
= inst
->src
[i
].hstride
;
4850 stride
= (hstride
== 0 ? 0 : (1 << (hstride
- 1)));
4852 stride
= inst
->src
[i
].stride
;
4855 fprintf(file
, "<%u>", stride
);
4857 fprintf(file
, ":%s", brw_reg_type_letters(inst
->src
[i
].type
));
4860 if (i
< inst
->sources
- 1 && inst
->src
[i
+ 1].file
!= BAD_FILE
)
4861 fprintf(file
, ", ");
4866 if (inst
->force_writemask_all
)
4867 fprintf(file
, "NoMask ");
4869 if (dispatch_width
== 16 && inst
->exec_size
== 8) {
4870 if (inst
->force_sechalf
)
4871 fprintf(file
, "2ndhalf ");
4873 fprintf(file
, "1sthalf ");
4876 fprintf(file
, "\n");
4880 * Possibly returns an instruction that set up @param reg.
4882 * Sometimes we want to take the result of some expression/variable
4883 * dereference tree and rewrite the instruction generating the result
4884 * of the tree. When processing the tree, we know that the
4885 * instructions generated are all writing temporaries that are dead
4886 * outside of this tree. So, if we have some instructions that write
4887 * a temporary, we're free to point that temp write somewhere else.
4889 * Note that this doesn't guarantee that the instruction generated
4890 * only reg -- it might be the size=4 destination of a texture instruction.
4893 fs_visitor::get_instruction_generating_reg(fs_inst
*start
,
4898 end
->is_partial_write() ||
4900 !reg
.equals(end
->dst
)) {
4908 fs_visitor::setup_fs_payload_gen6()
4910 assert(stage
== MESA_SHADER_FRAGMENT
);
4911 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
4912 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
4914 unsigned barycentric_interp_modes
=
4915 (stage
== MESA_SHADER_FRAGMENT
) ?
4916 ((brw_wm_prog_data
*) this->prog_data
)->barycentric_interp_modes
: 0;
4918 assert(devinfo
->gen
>= 6);
4920 /* R0-1: masks, pixel X/Y coordinates. */
4921 payload
.num_regs
= 2;
4922 /* R2: only for 32-pixel dispatch.*/
4924 /* R3-26: barycentric interpolation coordinates. These appear in the
4925 * same order that they appear in the brw_wm_barycentric_interp_mode
4926 * enum. Each set of coordinates occupies 2 registers if dispatch width
4927 * == 8 and 4 registers if dispatch width == 16. Coordinates only
4928 * appear if they were enabled using the "Barycentric Interpolation
4929 * Mode" bits in WM_STATE.
4931 for (int i
= 0; i
< BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT
; ++i
) {
4932 if (barycentric_interp_modes
& (1 << i
)) {
4933 payload
.barycentric_coord_reg
[i
] = payload
.num_regs
;
4934 payload
.num_regs
+= 2;
4935 if (dispatch_width
== 16) {
4936 payload
.num_regs
+= 2;
4941 /* R27: interpolated depth if uses source depth */
4942 prog_data
->uses_src_depth
=
4943 (nir
->info
.inputs_read
& (1 << VARYING_SLOT_POS
)) != 0;
4944 if (prog_data
->uses_src_depth
) {
4945 payload
.source_depth_reg
= payload
.num_regs
;
4947 if (dispatch_width
== 16) {
4948 /* R28: interpolated depth if not SIMD8. */
4953 /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W. */
4954 prog_data
->uses_src_w
=
4955 (nir
->info
.inputs_read
& (1 << VARYING_SLOT_POS
)) != 0;
4956 if (prog_data
->uses_src_w
) {
4957 payload
.source_w_reg
= payload
.num_regs
;
4959 if (dispatch_width
== 16) {
4960 /* R30: interpolated W if not SIMD8. */
4965 prog_data
->uses_pos_offset
= key
->compute_pos_offset
;
4966 /* R31: MSAA position offsets. */
4967 if (prog_data
->uses_pos_offset
) {
4968 payload
.sample_pos_reg
= payload
.num_regs
;
4972 /* R32: MSAA input coverage mask */
4973 prog_data
->uses_sample_mask
=
4974 (nir
->info
.system_values_read
& SYSTEM_BIT_SAMPLE_MASK_IN
) != 0;
4975 if (prog_data
->uses_sample_mask
) {
4976 assert(devinfo
->gen
>= 7);
4977 payload
.sample_mask_in_reg
= payload
.num_regs
;
4979 if (dispatch_width
== 16) {
4980 /* R33: input coverage mask if not SIMD8. */
4985 /* R34-: bary for 32-pixel. */
4986 /* R58-59: interp W for 32-pixel. */
4988 if (nir
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
4989 source_depth_to_render_target
= true;
4994 fs_visitor::setup_vs_payload()
4996 /* R0: thread header, R1: urb handles */
4997 payload
.num_regs
= 2;
5001 * We are building the local ID push constant data using the simplest possible
5002 * method. We simply push the local IDs directly as they should appear in the
5003 * registers for the uvec3 gl_LocalInvocationID variable.
5005 * Therefore, for SIMD8, we use 3 full registers, and for SIMD16 we use 6
5006 * registers worth of push constant space.
5008 * Note: Any updates to brw_cs_prog_local_id_payload_dwords,
5009 * fill_local_id_payload or fs_visitor::emit_cs_local_invocation_id_setup need
5012 * FINISHME: There are a few easy optimizations to consider.
5014 * 1. If gl_WorkGroupSize x, y or z is 1, we can just use zero, and there is
5015 * no need for using push constant space for that dimension.
5017 * 2. Since GL_MAX_COMPUTE_WORK_GROUP_SIZE is currently 1024 or less, we can
5018 * easily use 16-bit words rather than 32-bit dwords in the push constant
5021 * 3. If gl_WorkGroupSize x, y or z is small, then we can use bytes for
5022 * conveying the data, and thereby reduce push constant usage.
5026 fs_visitor::setup_gs_payload()
5028 assert(stage
== MESA_SHADER_GEOMETRY
);
5030 struct brw_gs_prog_data
*gs_prog_data
=
5031 (struct brw_gs_prog_data
*) prog_data
;
5032 struct brw_vue_prog_data
*vue_prog_data
=
5033 (struct brw_vue_prog_data
*) prog_data
;
5035 /* R0: thread header, R1: output URB handles */
5036 payload
.num_regs
= 2;
5038 if (gs_prog_data
->include_primitive_id
) {
5039 /* R2: Primitive ID 0..7 */
5043 /* Use a maximum of 32 registers for push-model inputs. */
5044 const unsigned max_push_components
= 32;
5046 /* If pushing our inputs would take too many registers, reduce the URB read
5047 * length (which is in HWords, or 8 registers), and resort to pulling.
5049 * Note that the GS reads <URB Read Length> HWords for every vertex - so we
5050 * have to multiply by VerticesIn to obtain the total storage requirement.
5052 if (8 * vue_prog_data
->urb_read_length
* nir
->info
.gs
.vertices_in
>
5053 max_push_components
) {
5054 gs_prog_data
->base
.include_vue_handles
= true;
5056 /* R3..RN: ICP Handles for each incoming vertex (when using pull model) */
5057 payload
.num_regs
+= nir
->info
.gs
.vertices_in
;
5059 vue_prog_data
->urb_read_length
=
5060 ROUND_DOWN_TO(max_push_components
/ nir
->info
.gs
.vertices_in
, 8) / 8;
5065 fs_visitor::setup_cs_payload()
5067 assert(devinfo
->gen
>= 7);
5068 brw_cs_prog_data
*prog_data
= (brw_cs_prog_data
*) this->prog_data
;
5070 payload
.num_regs
= 1;
5072 if (nir
->info
.system_values_read
& SYSTEM_BIT_LOCAL_INVOCATION_ID
) {
5073 prog_data
->local_invocation_id_regs
= dispatch_width
* 3 / 8;
5074 payload
.local_invocation_id_reg
= payload
.num_regs
;
5075 payload
.num_regs
+= prog_data
->local_invocation_id_regs
;
5080 fs_visitor::calculate_register_pressure()
5082 invalidate_live_intervals();
5083 calculate_live_intervals();
5085 unsigned num_instructions
= 0;
5086 foreach_block(block
, cfg
)
5087 num_instructions
+= block
->instructions
.length();
5089 regs_live_at_ip
= rzalloc_array(mem_ctx
, int, num_instructions
);
5091 for (unsigned reg
= 0; reg
< alloc
.count
; reg
++) {
5092 for (int ip
= virtual_grf_start
[reg
]; ip
<= virtual_grf_end
[reg
]; ip
++)
5093 regs_live_at_ip
[ip
] += alloc
.sizes
[reg
];
5098 fs_visitor::optimize()
5100 /* Start by validating the shader we currently have. */
5103 /* bld is the common builder object pointing at the end of the program we
5104 * used to translate it into i965 IR. For the optimization and lowering
5105 * passes coming next, any code added after the end of the program without
5106 * having explicitly called fs_builder::at() clearly points at a mistake.
5107 * Ideally optimization passes wouldn't be part of the visitor so they
5108 * wouldn't have access to bld at all, but they do, so just in case some
5109 * pass forgets to ask for a location explicitly set it to NULL here to
5110 * make it trip. The dispatch width is initialized to a bogus value to
5111 * make sure that optimizations set the execution controls explicitly to
5112 * match the code they are manipulating instead of relying on the defaults.
5114 bld
= fs_builder(this, 64);
5116 assign_constant_locations();
5117 demote_pull_constants();
5121 split_virtual_grfs();
5124 #define OPT(pass, args...) ({ \
5126 bool this_progress = pass(args); \
5128 if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
5129 char filename[64]; \
5130 snprintf(filename, 64, "%s%d-%s-%02d-%02d-" #pass, \
5131 stage_abbrev, dispatch_width, nir->info.name, iteration, pass_num); \
5133 backend_shader::dump_instructions(filename); \
5138 progress = progress || this_progress; \
5142 if (unlikely(INTEL_DEBUG
& DEBUG_OPTIMIZER
)) {
5144 snprintf(filename
, 64, "%s%d-%s-00-00-start",
5145 stage_abbrev
, dispatch_width
, nir
->info
.name
);
5147 backend_shader::dump_instructions(filename
);
5150 bool progress
= false;
5154 OPT(lower_simd_width
);
5155 OPT(lower_logical_sends
);
5162 OPT(remove_duplicate_mrf_writes
);
5166 OPT(opt_copy_propagate
);
5167 OPT(opt_predicated_break
, this);
5168 OPT(opt_cmod_propagation
);
5169 OPT(dead_code_eliminate
);
5170 OPT(opt_peephole_sel
);
5171 OPT(dead_control_flow_eliminate
, this);
5172 OPT(opt_register_renaming
);
5173 OPT(opt_redundant_discard_jumps
);
5174 OPT(opt_saturate_propagation
);
5175 OPT(opt_zero_samples
);
5176 OPT(register_coalesce
);
5177 OPT(compute_to_mrf
);
5178 OPT(eliminate_find_live_channel
);
5180 OPT(compact_virtual_grfs
);
5185 OPT(opt_sampler_eot
);
5187 if (OPT(lower_load_payload
)) {
5188 split_virtual_grfs();
5189 OPT(register_coalesce
);
5190 OPT(compute_to_mrf
);
5191 OPT(dead_code_eliminate
);
5194 OPT(opt_combine_constants
);
5195 OPT(lower_integer_multiplication
);
5197 if (devinfo
->gen
<= 5 && OPT(lower_minmax
)) {
5198 OPT(opt_cmod_propagation
);
5200 OPT(opt_copy_propagate
);
5201 OPT(dead_code_eliminate
);
5204 lower_uniform_pull_constant_loads();
5210 * Three source instruction must have a GRF/MRF destination register.
5211 * ARF NULL is not allowed. Fix that up by allocating a temporary GRF.
5214 fs_visitor::fixup_3src_null_dest()
5216 bool progress
= false;
5218 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
5219 if (inst
->is_3src() && inst
->dst
.is_null()) {
5220 inst
->dst
= fs_reg(VGRF
, alloc
.allocate(dispatch_width
/ 8),
5227 invalidate_live_intervals();
5231 fs_visitor::allocate_registers()
5233 bool allocated_without_spills
;
5235 static const enum instruction_scheduler_mode pre_modes
[] = {
5237 SCHEDULE_PRE_NON_LIFO
,
5241 /* Try each scheduling heuristic to see if it can successfully register
5242 * allocate without spilling. They should be ordered by decreasing
5243 * performance but increasing likelihood of allocating.
5245 for (unsigned i
= 0; i
< ARRAY_SIZE(pre_modes
); i
++) {
5246 schedule_instructions(pre_modes
[i
]);
5249 assign_regs_trivial();
5250 allocated_without_spills
= true;
5252 allocated_without_spills
= assign_regs(false);
5254 if (allocated_without_spills
)
5258 if (!allocated_without_spills
) {
5259 /* We assume that any spilling is worse than just dropping back to
5260 * SIMD8. There's probably actually some intermediate point where
5261 * SIMD16 with a couple of spills is still better.
5263 if (dispatch_width
== 16 && min_dispatch_width
<= 8) {
5264 fail("Failure to register allocate. Reduce number of "
5265 "live scalar values to avoid this.");
5267 compiler
->shader_perf_log(log_data
,
5268 "%s shader triggered register spilling. "
5269 "Try reducing the number of live scalar "
5270 "values to improve performance.\n",
5274 /* Since we're out of heuristics, just go spill registers until we
5275 * get an allocation.
5277 while (!assign_regs(true)) {
5283 /* This must come after all optimization and register allocation, since
5284 * it inserts dead code that happens to have side effects, and it does
5285 * so based on the actual physical registers in use.
5287 insert_gen4_send_dependency_workarounds();
5292 schedule_instructions(SCHEDULE_POST
);
5294 if (last_scratch
> 0)
5295 prog_data
->total_scratch
= brw_get_scratch_size(last_scratch
);
5299 fs_visitor::run_vs(gl_clip_plane
*clip_planes
)
5301 assert(stage
== MESA_SHADER_VERTEX
);
5305 if (shader_time_index
>= 0)
5306 emit_shader_time_begin();
5313 compute_clip_distance(clip_planes
);
5317 if (shader_time_index
>= 0)
5318 emit_shader_time_end();
5324 assign_curb_setup();
5325 assign_vs_urb_setup();
5327 fixup_3src_null_dest();
5328 allocate_registers();
5334 fs_visitor::run_tes()
5336 assert(stage
== MESA_SHADER_TESS_EVAL
);
5338 /* R0: thread header, R1-3: gl_TessCoord.xyz, R4: URB handles */
5339 payload
.num_regs
= 5;
5341 if (shader_time_index
>= 0)
5342 emit_shader_time_begin();
5351 if (shader_time_index
>= 0)
5352 emit_shader_time_end();
5358 assign_curb_setup();
5359 assign_tes_urb_setup();
5361 fixup_3src_null_dest();
5362 allocate_registers();
5368 fs_visitor::run_gs()
5370 assert(stage
== MESA_SHADER_GEOMETRY
);
5374 this->final_gs_vertex_count
= vgrf(glsl_type::uint_type
);
5376 if (gs_compile
->control_data_header_size_bits
> 0) {
5377 /* Create a VGRF to store accumulated control data bits. */
5378 this->control_data_bits
= vgrf(glsl_type::uint_type
);
5380 /* If we're outputting more than 32 control data bits, then EmitVertex()
5381 * will set control_data_bits to 0 after emitting the first vertex.
5382 * Otherwise, we need to initialize it to 0 here.
5384 if (gs_compile
->control_data_header_size_bits
<= 32) {
5385 const fs_builder abld
= bld
.annotate("initialize control data bits");
5386 abld
.MOV(this->control_data_bits
, brw_imm_ud(0u));
5390 if (shader_time_index
>= 0)
5391 emit_shader_time_begin();
5395 emit_gs_thread_end();
5397 if (shader_time_index
>= 0)
5398 emit_shader_time_end();
5407 assign_curb_setup();
5408 assign_gs_urb_setup();
5410 fixup_3src_null_dest();
5411 allocate_registers();
5417 fs_visitor::run_fs(bool do_rep_send
)
5419 brw_wm_prog_data
*wm_prog_data
= (brw_wm_prog_data
*) this->prog_data
;
5420 brw_wm_prog_key
*wm_key
= (brw_wm_prog_key
*) this->key
;
5422 assert(stage
== MESA_SHADER_FRAGMENT
);
5424 if (devinfo
->gen
>= 6)
5425 setup_fs_payload_gen6();
5427 setup_fs_payload_gen4();
5431 } else if (do_rep_send
) {
5432 assert(dispatch_width
== 16);
5433 emit_repclear_shader();
5435 if (shader_time_index
>= 0)
5436 emit_shader_time_begin();
5438 calculate_urb_setup();
5439 if (nir
->info
.inputs_read
> 0) {
5440 if (devinfo
->gen
< 6)
5441 emit_interpolation_setup_gen4();
5443 emit_interpolation_setup_gen6();
5446 /* We handle discards by keeping track of the still-live pixels in f0.1.
5447 * Initialize it with the dispatched pixels.
5449 if (wm_prog_data
->uses_kill
) {
5450 fs_inst
*discard_init
= bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
5451 discard_init
->flag_subreg
= 1;
5454 /* Generate FS IR for main(). (the visitor only descends into
5455 * functions called "main").
5462 if (wm_prog_data
->uses_kill
)
5463 bld
.emit(FS_OPCODE_PLACEHOLDER_HALT
);
5465 if (wm_key
->alpha_test_func
)
5470 if (shader_time_index
>= 0)
5471 emit_shader_time_end();
5477 assign_curb_setup();
5480 fixup_3src_null_dest();
5481 allocate_registers();
5487 if (dispatch_width
== 8)
5488 wm_prog_data
->reg_blocks
= brw_register_blocks(grf_used
);
5490 wm_prog_data
->reg_blocks_16
= brw_register_blocks(grf_used
);
5496 fs_visitor::run_cs()
5498 assert(stage
== MESA_SHADER_COMPUTE
);
5502 if (shader_time_index
>= 0)
5503 emit_shader_time_begin();
5505 if (devinfo
->is_haswell
&& prog_data
->total_shared
> 0) {
5506 /* Move SLM index from g0.0[27:24] to sr0.1[11:8] */
5507 const fs_builder abld
= bld
.exec_all().group(1, 0);
5508 abld
.MOV(retype(suboffset(brw_sr0_reg(), 1), BRW_REGISTER_TYPE_UW
),
5509 suboffset(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UW
), 1));
5517 emit_cs_terminate();
5519 if (shader_time_index
>= 0)
5520 emit_shader_time_end();
5526 assign_curb_setup();
5528 fixup_3src_null_dest();
5529 allocate_registers();
5538 * Return a bitfield where bit n is set if barycentric interpolation mode n
5539 * (see enum brw_wm_barycentric_interp_mode) is needed by the fragment shader.
5542 brw_compute_barycentric_interp_modes(const struct brw_device_info
*devinfo
,
5543 bool shade_model_flat
,
5544 bool persample_shading
,
5545 const nir_shader
*shader
)
5547 unsigned barycentric_interp_modes
= 0;
5549 nir_foreach_variable(var
, &shader
->inputs
) {
5550 enum glsl_interp_qualifier interp_qualifier
=
5551 (enum glsl_interp_qualifier
)var
->data
.interpolation
;
5552 bool is_centroid
= var
->data
.centroid
&& !persample_shading
;
5553 bool is_sample
= var
->data
.sample
|| persample_shading
;
5554 bool is_gl_Color
= (var
->data
.location
== VARYING_SLOT_COL0
) ||
5555 (var
->data
.location
== VARYING_SLOT_COL1
);
5557 /* Ignore WPOS and FACE, because they don't require interpolation. */
5558 if (var
->data
.location
== VARYING_SLOT_POS
||
5559 var
->data
.location
== VARYING_SLOT_FACE
)
5562 /* Determine the set (or sets) of barycentric coordinates needed to
5563 * interpolate this variable. Note that when
5564 * brw->needs_unlit_centroid_workaround is set, centroid interpolation
5565 * uses PIXEL interpolation for unlit pixels and CENTROID interpolation
5566 * for lit pixels, so we need both sets of barycentric coordinates.
5568 if (interp_qualifier
== INTERP_QUALIFIER_NOPERSPECTIVE
) {
5570 barycentric_interp_modes
|=
5571 1 << BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC
;
5572 } else if (is_sample
) {
5573 barycentric_interp_modes
|=
5574 1 << BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC
;
5576 if ((!is_centroid
&& !is_sample
) ||
5577 devinfo
->needs_unlit_centroid_workaround
) {
5578 barycentric_interp_modes
|=
5579 1 << BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC
;
5581 } else if (interp_qualifier
== INTERP_QUALIFIER_SMOOTH
||
5582 (!(shade_model_flat
&& is_gl_Color
) &&
5583 interp_qualifier
== INTERP_QUALIFIER_NONE
)) {
5585 barycentric_interp_modes
|=
5586 1 << BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC
;
5587 } else if (is_sample
) {
5588 barycentric_interp_modes
|=
5589 1 << BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC
;
5591 if ((!is_centroid
&& !is_sample
) ||
5592 devinfo
->needs_unlit_centroid_workaround
) {
5593 barycentric_interp_modes
|=
5594 1 << BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
5599 return barycentric_interp_modes
;
5603 brw_compute_flat_inputs(struct brw_wm_prog_data
*prog_data
,
5604 bool shade_model_flat
, const nir_shader
*shader
)
5606 prog_data
->flat_inputs
= 0;
5608 nir_foreach_variable(var
, &shader
->inputs
) {
5609 enum glsl_interp_qualifier interp_qualifier
=
5610 (enum glsl_interp_qualifier
)var
->data
.interpolation
;
5611 bool is_gl_Color
= (var
->data
.location
== VARYING_SLOT_COL0
) ||
5612 (var
->data
.location
== VARYING_SLOT_COL1
);
5614 int input_index
= prog_data
->urb_setup
[var
->data
.location
];
5616 if (input_index
< 0)
5620 if (interp_qualifier
== INTERP_QUALIFIER_FLAT
||
5621 (shade_model_flat
&& is_gl_Color
&&
5622 interp_qualifier
== INTERP_QUALIFIER_NONE
))
5623 prog_data
->flat_inputs
|= (1 << input_index
);
5628 computed_depth_mode(const nir_shader
*shader
)
5630 if (shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
5631 switch (shader
->info
.fs
.depth_layout
) {
5632 case FRAG_DEPTH_LAYOUT_NONE
:
5633 case FRAG_DEPTH_LAYOUT_ANY
:
5634 return BRW_PSCDEPTH_ON
;
5635 case FRAG_DEPTH_LAYOUT_GREATER
:
5636 return BRW_PSCDEPTH_ON_GE
;
5637 case FRAG_DEPTH_LAYOUT_LESS
:
5638 return BRW_PSCDEPTH_ON_LE
;
5639 case FRAG_DEPTH_LAYOUT_UNCHANGED
:
5640 return BRW_PSCDEPTH_OFF
;
5643 return BRW_PSCDEPTH_OFF
;
5647 brw_compile_fs(const struct brw_compiler
*compiler
, void *log_data
,
5649 const struct brw_wm_prog_key
*key
,
5650 struct brw_wm_prog_data
*prog_data
,
5651 const nir_shader
*src_shader
,
5652 struct gl_program
*prog
,
5653 int shader_time_index8
, int shader_time_index16
,
5655 unsigned *final_assembly_size
,
5658 nir_shader
*shader
= nir_shader_clone(mem_ctx
, src_shader
);
5659 shader
= brw_nir_apply_sampler_key(shader
, compiler
->devinfo
, &key
->tex
,
5661 brw_nir_lower_fs_inputs(shader
);
5662 brw_nir_lower_fs_outputs(shader
);
5663 shader
= brw_postprocess_nir(shader
, compiler
->devinfo
, true);
5665 /* key->alpha_test_func means simulating alpha testing via discards,
5666 * so the shader definitely kills pixels.
5668 prog_data
->uses_kill
= shader
->info
.fs
.uses_discard
|| key
->alpha_test_func
;
5669 prog_data
->uses_omask
=
5670 shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK
);
5671 prog_data
->computed_depth_mode
= computed_depth_mode(shader
);
5672 prog_data
->computed_stencil
=
5673 shader
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_STENCIL
);
5675 prog_data
->early_fragment_tests
= shader
->info
.fs
.early_fragment_tests
;
5677 prog_data
->barycentric_interp_modes
=
5678 brw_compute_barycentric_interp_modes(compiler
->devinfo
,
5680 key
->persample_shading
,
5683 fs_visitor
v(compiler
, log_data
, mem_ctx
, key
,
5684 &prog_data
->base
, prog
, shader
, 8,
5685 shader_time_index8
);
5686 if (!v
.run_fs(false /* do_rep_send */)) {
5688 *error_str
= ralloc_strdup(mem_ctx
, v
.fail_msg
);
5693 cfg_t
*simd16_cfg
= NULL
;
5694 fs_visitor
v2(compiler
, log_data
, mem_ctx
, key
,
5695 &prog_data
->base
, prog
, shader
, 16,
5696 shader_time_index16
);
5697 if (likely(!(INTEL_DEBUG
& DEBUG_NO16
) || use_rep_send
)) {
5698 if (!v
.simd16_unsupported
) {
5699 /* Try a SIMD16 compile */
5700 v2
.import_uniforms(&v
);
5701 if (!v2
.run_fs(use_rep_send
)) {
5702 compiler
->shader_perf_log(log_data
,
5703 "SIMD16 shader failed to compile: %s",
5706 simd16_cfg
= v2
.cfg
;
5711 /* We have to compute the flat inputs after the visitor is finished running
5712 * because it relies on prog_data->urb_setup which is computed in
5713 * fs_visitor::calculate_urb_setup().
5715 brw_compute_flat_inputs(prog_data
, key
->flat_shade
, shader
);
5718 int no_simd8
= (INTEL_DEBUG
& DEBUG_NO8
) || use_rep_send
;
5719 if ((no_simd8
|| compiler
->devinfo
->gen
< 5) && simd16_cfg
) {
5721 prog_data
->no_8
= true;
5724 prog_data
->no_8
= false;
5727 fs_generator
g(compiler
, log_data
, mem_ctx
, (void *) key
, &prog_data
->base
,
5728 v
.promoted_constants
, v
.runtime_check_aads_emit
,
5729 MESA_SHADER_FRAGMENT
);
5731 if (unlikely(INTEL_DEBUG
& DEBUG_WM
)) {
5732 g
.enable_debug(ralloc_asprintf(mem_ctx
, "%s fragment shader %s",
5733 shader
->info
.label
? shader
->info
.label
:
5735 shader
->info
.name
));
5739 g
.generate_code(simd8_cfg
, 8);
5741 prog_data
->prog_offset_16
= g
.generate_code(simd16_cfg
, 16);
5743 return g
.get_assembly(final_assembly_size
);
5747 fs_visitor::emit_cs_local_invocation_id_setup()
5749 assert(stage
== MESA_SHADER_COMPUTE
);
5751 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::uvec3_type
));
5753 struct brw_reg src
=
5754 brw_vec8_grf(payload
.local_invocation_id_reg
, 0);
5755 src
= retype(src
, BRW_REGISTER_TYPE_UD
);
5757 src
.nr
+= dispatch_width
/ 8;
5758 bld
.MOV(offset(*reg
, bld
, 1), src
);
5759 src
.nr
+= dispatch_width
/ 8;
5760 bld
.MOV(offset(*reg
, bld
, 2), src
);
5766 fs_visitor::emit_cs_work_group_id_setup()
5768 assert(stage
== MESA_SHADER_COMPUTE
);
5770 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::uvec3_type
));
5772 struct brw_reg
r0_1(retype(brw_vec1_grf(0, 1), BRW_REGISTER_TYPE_UD
));
5773 struct brw_reg
r0_6(retype(brw_vec1_grf(0, 6), BRW_REGISTER_TYPE_UD
));
5774 struct brw_reg
r0_7(retype(brw_vec1_grf(0, 7), BRW_REGISTER_TYPE_UD
));
5776 bld
.MOV(*reg
, r0_1
);
5777 bld
.MOV(offset(*reg
, bld
, 1), r0_6
);
5778 bld
.MOV(offset(*reg
, bld
, 2), r0_7
);
5784 brw_compile_cs(const struct brw_compiler
*compiler
, void *log_data
,
5786 const struct brw_cs_prog_key
*key
,
5787 struct brw_cs_prog_data
*prog_data
,
5788 const nir_shader
*src_shader
,
5789 int shader_time_index
,
5790 unsigned *final_assembly_size
,
5793 nir_shader
*shader
= nir_shader_clone(mem_ctx
, src_shader
);
5794 shader
= brw_nir_apply_sampler_key(shader
, compiler
->devinfo
, &key
->tex
,
5796 brw_nir_lower_cs_shared(shader
);
5797 prog_data
->base
.total_shared
+= shader
->num_shared
;
5798 shader
= brw_postprocess_nir(shader
, compiler
->devinfo
, true);
5800 prog_data
->local_size
[0] = shader
->info
.cs
.local_size
[0];
5801 prog_data
->local_size
[1] = shader
->info
.cs
.local_size
[1];
5802 prog_data
->local_size
[2] = shader
->info
.cs
.local_size
[2];
5803 unsigned local_workgroup_size
=
5804 shader
->info
.cs
.local_size
[0] * shader
->info
.cs
.local_size
[1] *
5805 shader
->info
.cs
.local_size
[2];
5807 unsigned max_cs_threads
= compiler
->devinfo
->max_cs_threads
;
5808 unsigned simd_required
= DIV_ROUND_UP(local_workgroup_size
, max_cs_threads
);
5811 const char *fail_msg
= NULL
;
5813 /* Now the main event: Visit the shader IR and generate our CS IR for it.
5815 fs_visitor
v8(compiler
, log_data
, mem_ctx
, key
, &prog_data
->base
,
5816 NULL
, /* Never used in core profile */
5817 shader
, 8, shader_time_index
);
5818 if (simd_required
<= 8) {
5820 fail_msg
= v8
.fail_msg
;
5823 prog_data
->simd_size
= 8;
5827 fs_visitor
v16(compiler
, log_data
, mem_ctx
, key
, &prog_data
->base
,
5828 NULL
, /* Never used in core profile */
5829 shader
, 16, shader_time_index
);
5830 if (likely(!(INTEL_DEBUG
& DEBUG_NO16
)) &&
5831 !fail_msg
&& !v8
.simd16_unsupported
&&
5832 local_workgroup_size
<= 16 * max_cs_threads
) {
5833 /* Try a SIMD16 compile */
5834 if (simd_required
<= 8)
5835 v16
.import_uniforms(&v8
);
5836 if (!v16
.run_cs()) {
5837 compiler
->shader_perf_log(log_data
,
5838 "SIMD16 shader failed to compile: %s",
5842 "Couldn't generate SIMD16 program and not "
5843 "enough threads for SIMD8";
5847 prog_data
->simd_size
= 16;
5851 if (unlikely(cfg
== NULL
)) {
5854 *error_str
= ralloc_strdup(mem_ctx
, fail_msg
);
5859 fs_generator
g(compiler
, log_data
, mem_ctx
, (void*) key
, &prog_data
->base
,
5860 v8
.promoted_constants
, v8
.runtime_check_aads_emit
,
5861 MESA_SHADER_COMPUTE
);
5862 if (INTEL_DEBUG
& DEBUG_CS
) {
5863 char *name
= ralloc_asprintf(mem_ctx
, "%s compute shader %s",
5864 shader
->info
.label
? shader
->info
.label
:
5867 g
.enable_debug(name
);
5870 g
.generate_code(cfg
, prog_data
->simd_size
);
5872 return g
.get_assembly(final_assembly_size
);
5876 brw_cs_fill_local_id_payload(const struct brw_cs_prog_data
*prog_data
,
5877 void *buffer
, uint32_t threads
, uint32_t stride
)
5879 if (prog_data
->local_invocation_id_regs
== 0)
5882 /* 'stride' should be an integer number of registers, that is, a multiple
5885 assert(stride
% 32 == 0);
5887 unsigned x
= 0, y
= 0, z
= 0;
5888 for (unsigned t
= 0; t
< threads
; t
++) {
5889 uint32_t *param
= (uint32_t *) buffer
+ stride
* t
/ 4;
5891 for (unsigned i
= 0; i
< prog_data
->simd_size
; i
++) {
5892 param
[0 * prog_data
->simd_size
+ i
] = x
;
5893 param
[1 * prog_data
->simd_size
+ i
] = y
;
5894 param
[2 * prog_data
->simd_size
+ i
] = z
;
5897 if (x
== prog_data
->local_size
[0]) {
5900 if (y
== prog_data
->local_size
[1]) {
5903 if (z
== prog_data
->local_size
[2])