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 <sys/types.h>
33 #include "util/hash_table.h"
34 #include "main/macros.h"
35 #include "main/shaderobj.h"
36 #include "main/fbobject.h"
37 #include "program/prog_parameter.h"
38 #include "program/prog_print.h"
39 #include "util/register_allocate.h"
40 #include "program/hash_table.h"
41 #include "brw_context.h"
46 #include "brw_dead_control_flow.h"
47 #include "main/uniforms.h"
48 #include "brw_fs_live_variables.h"
49 #include "glsl/glsl_types.h"
50 #include "program/sampler.h"
55 fs_inst::init(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
56 const fs_reg
*src
, unsigned sources
)
58 memset(this, 0, sizeof(*this));
60 this->src
= new fs_reg
[MAX2(sources
, 3)];
61 for (unsigned i
= 0; i
< sources
; i
++)
62 this->src
[i
] = src
[i
];
64 this->opcode
= opcode
;
66 this->sources
= sources
;
67 this->exec_size
= exec_size
;
69 assert(dst
.file
!= IMM
&& dst
.file
!= UNIFORM
);
71 assert(this->exec_size
!= 0);
73 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
75 /* This will be the case for almost all instructions. */
81 this->regs_written
= DIV_ROUND_UP(dst
.component_size(exec_size
),
85 this->regs_written
= 0;
89 unreachable("Invalid destination register file");
91 unreachable("Invalid register file");
94 this->writes_accumulator
= false;
99 init(BRW_OPCODE_NOP
, 8, dst
, NULL
, 0);
102 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
)
104 init(opcode
, exec_size
, reg_undef
, NULL
, 0);
107 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
)
109 init(opcode
, exec_size
, dst
, NULL
, 0);
112 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
115 const fs_reg src
[1] = { src0
};
116 init(opcode
, exec_size
, dst
, src
, 1);
119 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
120 const fs_reg
&src0
, const fs_reg
&src1
)
122 const fs_reg src
[2] = { src0
, src1
};
123 init(opcode
, exec_size
, dst
, src
, 2);
126 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
127 const fs_reg
&src0
, const fs_reg
&src1
, const fs_reg
&src2
)
129 const fs_reg src
[3] = { src0
, src1
, src2
};
130 init(opcode
, exec_size
, dst
, src
, 3);
133 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_width
, const fs_reg
&dst
,
134 const fs_reg src
[], unsigned sources
)
136 init(opcode
, exec_width
, dst
, src
, sources
);
139 fs_inst::fs_inst(const fs_inst
&that
)
141 memcpy(this, &that
, sizeof(that
));
143 this->src
= new fs_reg
[MAX2(that
.sources
, 3)];
145 for (unsigned i
= 0; i
< that
.sources
; i
++)
146 this->src
[i
] = that
.src
[i
];
155 fs_inst::resize_sources(uint8_t num_sources
)
157 if (this->sources
!= num_sources
) {
158 fs_reg
*src
= new fs_reg
[MAX2(num_sources
, 3)];
160 for (unsigned i
= 0; i
< MIN2(this->sources
, num_sources
); ++i
)
161 src
[i
] = this->src
[i
];
165 this->sources
= num_sources
;
170 fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_builder
&bld
,
172 const fs_reg
&surf_index
,
173 const fs_reg
&varying_offset
,
174 uint32_t const_offset
)
176 /* We have our constant surface use a pitch of 4 bytes, so our index can
177 * be any component of a vector, and then we load 4 contiguous
178 * components starting from that.
180 * We break down the const_offset to a portion added to the variable
181 * offset and a portion done using reg_offset, which means that if you
182 * have GLSL using something like "uniform vec4 a[20]; gl_FragColor =
183 * a[i]", we'll temporarily generate 4 vec4 loads from offset i * 4, and
184 * CSE can later notice that those loads are all the same and eliminate
185 * the redundant ones.
187 fs_reg vec4_offset
= vgrf(glsl_type::int_type
);
188 bld
.ADD(vec4_offset
, varying_offset
, fs_reg(const_offset
& ~3));
191 if (devinfo
->gen
== 4 && bld
.dispatch_width() == 8) {
192 /* Pre-gen5, we can either use a SIMD8 message that requires (header,
193 * u, v, r) as parameters, or we can just use the SIMD16 message
194 * consisting of (header, u). We choose the second, at the cost of a
195 * longer return length.
201 if (devinfo
->gen
>= 7)
202 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
;
204 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
;
206 int regs_written
= 4 * (bld
.dispatch_width() / 8) * scale
;
207 fs_reg vec4_result
= fs_reg(GRF
, alloc
.allocate(regs_written
), dst
.type
);
208 fs_inst
*inst
= bld
.emit(op
, vec4_result
, surf_index
, vec4_offset
);
209 inst
->regs_written
= regs_written
;
211 if (devinfo
->gen
< 7) {
213 inst
->header_size
= 1;
214 if (devinfo
->gen
== 4)
217 inst
->mlen
= 1 + bld
.dispatch_width() / 8;
220 bld
.MOV(dst
, offset(vec4_result
, bld
, (const_offset
& 3) * scale
));
224 * A helper for MOV generation for fixing up broken hardware SEND dependency
228 fs_visitor::DEP_RESOLVE_MOV(const fs_builder
&bld
, int grf
)
230 /* The caller always wants uncompressed to emit the minimal extra
231 * dependencies, and to avoid having to deal with aligning its regs to 2.
233 const fs_builder ubld
= bld
.annotate("send dependency resolve")
236 ubld
.MOV(ubld
.null_reg_f(), fs_reg(GRF
, grf
, BRW_REGISTER_TYPE_F
));
240 fs_inst::equals(fs_inst
*inst
) const
242 return (opcode
== inst
->opcode
&&
243 dst
.equals(inst
->dst
) &&
244 src
[0].equals(inst
->src
[0]) &&
245 src
[1].equals(inst
->src
[1]) &&
246 src
[2].equals(inst
->src
[2]) &&
247 saturate
== inst
->saturate
&&
248 predicate
== inst
->predicate
&&
249 conditional_mod
== inst
->conditional_mod
&&
250 mlen
== inst
->mlen
&&
251 base_mrf
== inst
->base_mrf
&&
252 target
== inst
->target
&&
254 header_size
== inst
->header_size
&&
255 shadow_compare
== inst
->shadow_compare
&&
256 exec_size
== inst
->exec_size
&&
257 offset
== inst
->offset
);
261 fs_inst::overwrites_reg(const fs_reg
®
) const
263 return reg
.in_range(dst
, regs_written
);
267 fs_inst::is_send_from_grf() const
270 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
271 case SHADER_OPCODE_SHADER_TIME_ADD
:
272 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
273 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
274 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
275 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
276 case SHADER_OPCODE_UNTYPED_ATOMIC
:
277 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
278 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
279 case SHADER_OPCODE_TYPED_ATOMIC
:
280 case SHADER_OPCODE_TYPED_SURFACE_READ
:
281 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
282 case SHADER_OPCODE_URB_WRITE_SIMD8
:
284 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
285 return src
[1].file
== GRF
;
286 case FS_OPCODE_FB_WRITE
:
287 return src
[0].file
== GRF
;
290 return src
[0].file
== GRF
;
297 fs_inst::is_copy_payload(const brw::simple_allocator
&grf_alloc
) const
299 if (this->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
302 fs_reg reg
= this->src
[0];
303 if (reg
.file
!= GRF
|| reg
.reg_offset
!= 0 || reg
.stride
== 0)
306 if (grf_alloc
.sizes
[reg
.reg
] != this->regs_written
)
309 for (int i
= 0; i
< this->sources
; i
++) {
310 reg
.type
= this->src
[i
].type
;
311 if (!this->src
[i
].equals(reg
))
314 if (i
< this->header_size
) {
317 reg
.reg_offset
+= this->exec_size
/ 8;
325 fs_inst::can_do_source_mods(const struct brw_device_info
*devinfo
)
327 if (devinfo
->gen
== 6 && is_math())
330 if (is_send_from_grf())
333 if (!backend_instruction::can_do_source_mods())
340 fs_inst::has_side_effects() const
342 return this->eot
|| backend_instruction::has_side_effects();
348 memset(this, 0, sizeof(*this));
352 /** Generic unset register constructor. */
356 this->file
= BAD_FILE
;
359 /** Immediate value constructor. */
360 fs_reg::fs_reg(float f
)
364 this->type
= BRW_REGISTER_TYPE_F
;
366 this->fixed_hw_reg
.dw1
.f
= f
;
369 /** Immediate value constructor. */
370 fs_reg::fs_reg(int32_t i
)
374 this->type
= BRW_REGISTER_TYPE_D
;
376 this->fixed_hw_reg
.dw1
.d
= i
;
379 /** Immediate value constructor. */
380 fs_reg::fs_reg(uint32_t u
)
384 this->type
= BRW_REGISTER_TYPE_UD
;
386 this->fixed_hw_reg
.dw1
.ud
= u
;
389 /** Vector float immediate value constructor. */
390 fs_reg::fs_reg(uint8_t vf
[4])
394 this->type
= BRW_REGISTER_TYPE_VF
;
395 memcpy(&this->fixed_hw_reg
.dw1
.ud
, vf
, sizeof(unsigned));
398 /** Vector float immediate value constructor. */
399 fs_reg::fs_reg(uint8_t vf0
, uint8_t vf1
, uint8_t vf2
, uint8_t vf3
)
403 this->type
= BRW_REGISTER_TYPE_VF
;
404 this->fixed_hw_reg
.dw1
.ud
= (vf0
<< 0) |
410 /** Fixed brw_reg. */
411 fs_reg::fs_reg(struct brw_reg fixed_hw_reg
)
415 this->fixed_hw_reg
= fixed_hw_reg
;
416 this->type
= fixed_hw_reg
.type
;
420 fs_reg::equals(const fs_reg
&r
) const
422 return (file
== r
.file
&&
424 reg_offset
== r
.reg_offset
&&
425 subreg_offset
== r
.subreg_offset
&&
427 negate
== r
.negate
&&
429 !reladdr
&& !r
.reladdr
&&
430 memcmp(&fixed_hw_reg
, &r
.fixed_hw_reg
, sizeof(fixed_hw_reg
)) == 0 &&
435 fs_reg::set_smear(unsigned subreg
)
437 assert(file
!= HW_REG
&& file
!= IMM
);
438 subreg_offset
= subreg
* type_sz(type
);
444 fs_reg::is_contiguous() const
450 fs_reg::component_size(unsigned width
) const
452 const unsigned stride
= (file
!= HW_REG
? this->stride
:
453 fixed_hw_reg
.hstride
== 0 ? 0 :
454 1 << (fixed_hw_reg
.hstride
- 1));
455 return MAX2(width
* stride
, 1) * type_sz(type
);
459 type_size_scalar(const struct glsl_type
*type
)
461 unsigned int size
, i
;
463 switch (type
->base_type
) {
466 case GLSL_TYPE_FLOAT
:
468 return type
->components();
469 case GLSL_TYPE_ARRAY
:
470 return type_size_scalar(type
->fields
.array
) * type
->length
;
471 case GLSL_TYPE_STRUCT
:
473 for (i
= 0; i
< type
->length
; i
++) {
474 size
+= type_size_scalar(type
->fields
.structure
[i
].type
);
477 case GLSL_TYPE_SAMPLER
:
478 /* Samplers take up no register space, since they're baked in at
482 case GLSL_TYPE_ATOMIC_UINT
:
484 case GLSL_TYPE_SUBROUTINE
:
486 case GLSL_TYPE_IMAGE
:
487 return BRW_IMAGE_PARAM_SIZE
;
489 case GLSL_TYPE_ERROR
:
490 case GLSL_TYPE_INTERFACE
:
491 case GLSL_TYPE_DOUBLE
:
492 unreachable("not reached");
499 * Create a MOV to read the timestamp register.
501 * The caller is responsible for emitting the MOV. The return value is
502 * the destination of the MOV, with extra parameters set.
505 fs_visitor::get_timestamp(const fs_builder
&bld
)
507 assert(devinfo
->gen
>= 7);
509 fs_reg ts
= fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE
,
512 BRW_REGISTER_TYPE_UD
));
514 fs_reg dst
= fs_reg(GRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
516 /* We want to read the 3 fields we care about even if it's not enabled in
519 bld
.group(4, 0).exec_all().MOV(dst
, ts
);
521 /* The caller wants the low 32 bits of the timestamp. Since it's running
522 * at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,
523 * which is plenty of time for our purposes. It is identical across the
524 * EUs, but since it's tracking GPU core speed it will increment at a
525 * varying rate as render P-states change.
527 * The caller could also check if render P-states have changed (or anything
528 * else that might disrupt timing) by setting smear to 2 and checking if
529 * that field is != 0.
537 fs_visitor::emit_shader_time_begin()
539 shader_start_time
= get_timestamp(bld
.annotate("shader time start"));
543 fs_visitor::emit_shader_time_end()
545 /* Insert our code just before the final SEND with EOT. */
546 exec_node
*end
= this->instructions
.get_tail();
547 assert(end
&& ((fs_inst
*) end
)->eot
);
548 const fs_builder ibld
= bld
.annotate("shader time end")
549 .exec_all().at(NULL
, end
);
551 fs_reg shader_end_time
= get_timestamp(ibld
);
553 /* Check that there weren't any timestamp reset events (assuming these
554 * were the only two timestamp reads that happened).
556 fs_reg reset
= shader_end_time
;
558 set_condmod(BRW_CONDITIONAL_Z
,
559 ibld
.AND(ibld
.null_reg_ud(), reset
, fs_reg(1u)));
560 ibld
.IF(BRW_PREDICATE_NORMAL
);
562 fs_reg start
= shader_start_time
;
564 fs_reg diff
= fs_reg(GRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
567 const fs_builder cbld
= ibld
.group(1, 0);
568 cbld
.group(1, 0).ADD(diff
, start
, shader_end_time
);
570 /* If there were no instructions between the two timestamp gets, the diff
571 * is 2 cycles. Remove that overhead, so I can forget about that when
572 * trying to determine the time taken for single instructions.
574 cbld
.ADD(diff
, diff
, fs_reg(-2u));
575 SHADER_TIME_ADD(cbld
, 0, diff
);
576 SHADER_TIME_ADD(cbld
, 1, fs_reg(1u));
577 ibld
.emit(BRW_OPCODE_ELSE
);
578 SHADER_TIME_ADD(cbld
, 2, fs_reg(1u));
579 ibld
.emit(BRW_OPCODE_ENDIF
);
583 fs_visitor::SHADER_TIME_ADD(const fs_builder
&bld
,
584 int shader_time_subindex
,
587 int index
= shader_time_index
* 3 + shader_time_subindex
;
588 fs_reg offset
= fs_reg(index
* SHADER_TIME_STRIDE
);
591 if (dispatch_width
== 8)
592 payload
= vgrf(glsl_type::uvec2_type
);
594 payload
= vgrf(glsl_type::uint_type
);
596 bld
.emit(SHADER_OPCODE_SHADER_TIME_ADD
, fs_reg(), payload
, offset
, value
);
600 fs_visitor::vfail(const char *format
, va_list va
)
609 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
610 msg
= ralloc_asprintf(mem_ctx
, "%s compile failed: %s\n", stage_abbrev
, msg
);
612 this->fail_msg
= msg
;
615 fprintf(stderr
, "%s", msg
);
620 fs_visitor::fail(const char *format
, ...)
624 va_start(va
, format
);
630 * Mark this program as impossible to compile in SIMD16 mode.
632 * During the SIMD8 compile (which happens first), we can detect and flag
633 * things that are unsupported in SIMD16 mode, so the compiler can skip
634 * the SIMD16 compile altogether.
636 * During a SIMD16 compile (if one happens anyway), this just calls fail().
639 fs_visitor::no16(const char *msg
)
641 if (dispatch_width
== 16) {
644 simd16_unsupported
= true;
646 compiler
->shader_perf_log(log_data
,
647 "SIMD16 shader failed to compile: %s", msg
);
652 * Returns true if the instruction has a flag that means it won't
653 * update an entire destination register.
655 * For example, dead code elimination and live variable analysis want to know
656 * when a write to a variable screens off any preceding values that were in
660 fs_inst::is_partial_write() const
662 return ((this->predicate
&& this->opcode
!= BRW_OPCODE_SEL
) ||
663 (this->exec_size
* type_sz(this->dst
.type
)) < 32 ||
664 !this->dst
.is_contiguous());
668 fs_inst::components_read(unsigned i
) const
671 case FS_OPCODE_LINTERP
:
677 case FS_OPCODE_PIXEL_X
:
678 case FS_OPCODE_PIXEL_Y
:
682 case FS_OPCODE_FB_WRITE_LOGICAL
:
683 assert(src
[6].file
== IMM
);
684 /* First/second FB write color. */
686 return src
[6].fixed_hw_reg
.dw1
.ud
;
690 case SHADER_OPCODE_TEX_LOGICAL
:
691 case SHADER_OPCODE_TXD_LOGICAL
:
692 case SHADER_OPCODE_TXF_LOGICAL
:
693 case SHADER_OPCODE_TXL_LOGICAL
:
694 case SHADER_OPCODE_TXS_LOGICAL
:
695 case FS_OPCODE_TXB_LOGICAL
:
696 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
697 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
698 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
699 case SHADER_OPCODE_LOD_LOGICAL
:
700 case SHADER_OPCODE_TG4_LOGICAL
:
701 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
702 assert(src
[8].file
== IMM
&& src
[9].file
== IMM
);
703 /* Texture coordinates. */
705 return src
[8].fixed_hw_reg
.dw1
.ud
;
706 /* Texture derivatives. */
707 else if ((i
== 2 || i
== 3) && opcode
== SHADER_OPCODE_TXD_LOGICAL
)
708 return src
[9].fixed_hw_reg
.dw1
.ud
;
709 /* Texture offset. */
715 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
716 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
717 assert(src
[3].file
== IMM
);
718 /* Surface coordinates. */
720 return src
[3].fixed_hw_reg
.dw1
.ud
;
721 /* Surface operation source (ignored for reads). */
727 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
728 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
729 assert(src
[3].file
== IMM
&&
731 /* Surface coordinates. */
733 return src
[3].fixed_hw_reg
.dw1
.ud
;
734 /* Surface operation source. */
736 return src
[4].fixed_hw_reg
.dw1
.ud
;
740 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
741 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
: {
742 assert(src
[3].file
== IMM
&&
744 const unsigned op
= src
[4].fixed_hw_reg
.dw1
.ud
;
745 /* Surface coordinates. */
747 return src
[3].fixed_hw_reg
.dw1
.ud
;
748 /* Surface operation source. */
749 else if (i
== 1 && op
== BRW_AOP_CMPWR
)
751 else if (i
== 1 && (op
== BRW_AOP_INC
|| op
== BRW_AOP_DEC
||
752 op
== BRW_AOP_PREDEC
))
764 fs_inst::regs_read(int arg
) const
767 case FS_OPCODE_FB_WRITE
:
768 case SHADER_OPCODE_URB_WRITE_SIMD8
:
769 case SHADER_OPCODE_UNTYPED_ATOMIC
:
770 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
771 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
772 case SHADER_OPCODE_TYPED_ATOMIC
:
773 case SHADER_OPCODE_TYPED_SURFACE_READ
:
774 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
775 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
780 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
:
781 /* The payload is actually stored in src1 */
786 case FS_OPCODE_LINTERP
:
791 case SHADER_OPCODE_LOAD_PAYLOAD
:
792 if (arg
< this->header_size
)
796 case CS_OPCODE_CS_TERMINATE
:
800 if (is_tex() && arg
== 0 && src
[0].file
== GRF
)
805 switch (src
[arg
].file
) {
814 return DIV_ROUND_UP(components_read(arg
) *
815 src
[arg
].component_size(exec_size
),
818 unreachable("MRF registers are not allowed as sources");
820 unreachable("Invalid register file");
825 fs_inst::reads_flag() const
831 fs_inst::writes_flag() const
833 return (conditional_mod
&& (opcode
!= BRW_OPCODE_SEL
&&
834 opcode
!= BRW_OPCODE_IF
&&
835 opcode
!= BRW_OPCODE_WHILE
)) ||
836 opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
;
840 * Returns how many MRFs an FS opcode will write over.
842 * Note that this is not the 0 or 1 implied writes in an actual gen
843 * instruction -- the FS opcodes often generate MOVs in addition.
846 fs_visitor::implied_mrf_writes(fs_inst
*inst
)
851 if (inst
->base_mrf
== -1)
854 switch (inst
->opcode
) {
855 case SHADER_OPCODE_RCP
:
856 case SHADER_OPCODE_RSQ
:
857 case SHADER_OPCODE_SQRT
:
858 case SHADER_OPCODE_EXP2
:
859 case SHADER_OPCODE_LOG2
:
860 case SHADER_OPCODE_SIN
:
861 case SHADER_OPCODE_COS
:
862 return 1 * dispatch_width
/ 8;
863 case SHADER_OPCODE_POW
:
864 case SHADER_OPCODE_INT_QUOTIENT
:
865 case SHADER_OPCODE_INT_REMAINDER
:
866 return 2 * dispatch_width
/ 8;
867 case SHADER_OPCODE_TEX
:
869 case SHADER_OPCODE_TXD
:
870 case SHADER_OPCODE_TXF
:
871 case SHADER_OPCODE_TXF_CMS
:
872 case SHADER_OPCODE_TXF_MCS
:
873 case SHADER_OPCODE_TG4
:
874 case SHADER_OPCODE_TG4_OFFSET
:
875 case SHADER_OPCODE_TXL
:
876 case SHADER_OPCODE_TXS
:
877 case SHADER_OPCODE_LOD
:
879 case FS_OPCODE_FB_WRITE
:
881 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
882 case SHADER_OPCODE_GEN4_SCRATCH_READ
:
884 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
:
886 case SHADER_OPCODE_GEN4_SCRATCH_WRITE
:
888 case SHADER_OPCODE_UNTYPED_ATOMIC
:
889 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
890 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE
:
891 case SHADER_OPCODE_TYPED_ATOMIC
:
892 case SHADER_OPCODE_TYPED_SURFACE_READ
:
893 case SHADER_OPCODE_TYPED_SURFACE_WRITE
:
894 case SHADER_OPCODE_URB_WRITE_SIMD8
:
895 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
896 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
897 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
898 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
901 unreachable("not reached");
906 fs_visitor::vgrf(const glsl_type
*const type
)
908 int reg_width
= dispatch_width
/ 8;
909 return fs_reg(GRF
, alloc
.allocate(type_size_scalar(type
) * reg_width
),
910 brw_type_for_base_type(type
));
913 /** Fixed HW reg constructor. */
914 fs_reg::fs_reg(enum register_file file
, int reg
)
919 this->type
= BRW_REGISTER_TYPE_F
;
920 this->stride
= (file
== UNIFORM
? 0 : 1);
923 /** Fixed HW reg constructor. */
924 fs_reg::fs_reg(enum register_file file
, int reg
, enum brw_reg_type type
)
930 this->stride
= (file
== UNIFORM
? 0 : 1);
933 /* For SIMD16, we need to follow from the uniform setup of SIMD8 dispatch.
934 * This brings in those uniform definitions
937 fs_visitor::import_uniforms(fs_visitor
*v
)
939 this->push_constant_loc
= v
->push_constant_loc
;
940 this->pull_constant_loc
= v
->pull_constant_loc
;
941 this->uniforms
= v
->uniforms
;
942 this->param_size
= v
->param_size
;
946 fs_visitor::setup_vec4_uniform_value(unsigned param_offset
,
947 const gl_constant_value
*values
,
950 static const gl_constant_value zero
= { 0 };
952 for (unsigned i
= 0; i
< n
; ++i
)
953 stage_prog_data
->param
[param_offset
+ i
] = &values
[i
];
955 for (unsigned i
= n
; i
< 4; ++i
)
956 stage_prog_data
->param
[param_offset
+ i
] = &zero
;
960 fs_visitor::emit_fragcoord_interpolation(bool pixel_center_integer
,
961 bool origin_upper_left
)
963 assert(stage
== MESA_SHADER_FRAGMENT
);
964 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
965 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec4_type
));
967 bool flip
= !origin_upper_left
^ key
->render_to_fbo
;
970 if (pixel_center_integer
) {
971 bld
.MOV(wpos
, this->pixel_x
);
973 bld
.ADD(wpos
, this->pixel_x
, fs_reg(0.5f
));
975 wpos
= offset(wpos
, bld
, 1);
978 if (!flip
&& pixel_center_integer
) {
979 bld
.MOV(wpos
, this->pixel_y
);
981 fs_reg pixel_y
= this->pixel_y
;
982 float offset
= (pixel_center_integer
? 0.0f
: 0.5f
);
985 pixel_y
.negate
= true;
986 offset
+= key
->drawable_height
- 1.0f
;
989 bld
.ADD(wpos
, pixel_y
, fs_reg(offset
));
991 wpos
= offset(wpos
, bld
, 1);
994 if (devinfo
->gen
>= 6) {
995 bld
.MOV(wpos
, fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0)));
997 bld
.emit(FS_OPCODE_LINTERP
, wpos
,
998 this->delta_xy
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
999 interp_reg(VARYING_SLOT_POS
, 2));
1001 wpos
= offset(wpos
, bld
, 1);
1003 /* gl_FragCoord.w: Already set up in emit_interpolation */
1004 bld
.MOV(wpos
, this->wpos_w
);
1010 fs_visitor::emit_linterp(const fs_reg
&attr
, const fs_reg
&interp
,
1011 glsl_interp_qualifier interpolation_mode
,
1012 bool is_centroid
, bool is_sample
)
1014 brw_wm_barycentric_interp_mode barycoord_mode
;
1015 if (devinfo
->gen
>= 6) {
1017 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1018 barycoord_mode
= BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC
;
1020 barycoord_mode
= BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC
;
1021 } else if (is_sample
) {
1022 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1023 barycoord_mode
= BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC
;
1025 barycoord_mode
= BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC
;
1027 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1028 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1030 barycoord_mode
= BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC
;
1033 /* On Ironlake and below, there is only one interpolation mode.
1034 * Centroid interpolation doesn't mean anything on this hardware --
1035 * there is no multisampling.
1037 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1039 return bld
.emit(FS_OPCODE_LINTERP
, attr
,
1040 this->delta_xy
[barycoord_mode
], interp
);
1044 fs_visitor::emit_general_interpolation(fs_reg attr
, const char *name
,
1045 const glsl_type
*type
,
1046 glsl_interp_qualifier interpolation_mode
,
1047 int location
, bool mod_centroid
,
1050 attr
.type
= brw_type_for_base_type(type
->get_scalar_type());
1052 assert(stage
== MESA_SHADER_FRAGMENT
);
1053 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1054 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1056 unsigned int array_elements
;
1058 if (type
->is_array()) {
1059 array_elements
= type
->length
;
1060 if (array_elements
== 0) {
1061 fail("dereferenced array '%s' has length 0\n", name
);
1063 type
= type
->fields
.array
;
1068 if (interpolation_mode
== INTERP_QUALIFIER_NONE
) {
1070 location
== VARYING_SLOT_COL0
|| location
== VARYING_SLOT_COL1
;
1071 if (key
->flat_shade
&& is_gl_Color
) {
1072 interpolation_mode
= INTERP_QUALIFIER_FLAT
;
1074 interpolation_mode
= INTERP_QUALIFIER_SMOOTH
;
1078 for (unsigned int i
= 0; i
< array_elements
; i
++) {
1079 for (unsigned int j
= 0; j
< type
->matrix_columns
; j
++) {
1080 if (prog_data
->urb_setup
[location
] == -1) {
1081 /* If there's no incoming setup data for this slot, don't
1082 * emit interpolation for it.
1084 attr
= offset(attr
, bld
, type
->vector_elements
);
1089 if (interpolation_mode
== INTERP_QUALIFIER_FLAT
) {
1090 /* Constant interpolation (flat shading) case. The SF has
1091 * handed us defined values in only the constant offset
1092 * field of the setup reg.
1094 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1095 struct brw_reg interp
= interp_reg(location
, k
);
1096 interp
= suboffset(interp
, 3);
1097 interp
.type
= attr
.type
;
1098 bld
.emit(FS_OPCODE_CINTERP
, attr
, fs_reg(interp
));
1099 attr
= offset(attr
, bld
, 1);
1102 /* Smooth/noperspective interpolation case. */
1103 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1104 struct brw_reg interp
= interp_reg(location
, k
);
1105 if (devinfo
->needs_unlit_centroid_workaround
&& mod_centroid
) {
1106 /* Get the pixel/sample mask into f0 so that we know
1107 * which pixels are lit. Then, for each channel that is
1108 * unlit, replace the centroid data with non-centroid
1111 bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
1114 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1116 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1117 inst
->predicate_inverse
= true;
1118 if (devinfo
->has_pln
)
1119 inst
->no_dd_clear
= true;
1121 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1122 mod_centroid
&& !key
->persample_shading
,
1123 mod_sample
|| key
->persample_shading
);
1124 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1125 inst
->predicate_inverse
= false;
1126 if (devinfo
->has_pln
)
1127 inst
->no_dd_check
= true;
1130 emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1131 mod_centroid
&& !key
->persample_shading
,
1132 mod_sample
|| key
->persample_shading
);
1134 if (devinfo
->gen
< 6 && interpolation_mode
== INTERP_QUALIFIER_SMOOTH
) {
1135 bld
.MUL(attr
, attr
, this->pixel_w
);
1137 attr
= offset(attr
, bld
, 1);
1147 fs_visitor::emit_frontfacing_interpolation()
1149 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::bool_type
));
1151 if (devinfo
->gen
>= 6) {
1152 /* Bit 15 of g0.0 is 0 if the polygon is front facing. We want to create
1153 * a boolean result from this (~0/true or 0/false).
1155 * We can use the fact that bit 15 is the MSB of g0.0:W to accomplish
1156 * this task in only one instruction:
1157 * - a negation source modifier will flip the bit; and
1158 * - a W -> D type conversion will sign extend the bit into the high
1159 * word of the destination.
1161 * An ASR 15 fills the low word of the destination.
1163 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
1166 bld
.ASR(*reg
, g0
, fs_reg(15));
1168 /* Bit 31 of g1.6 is 0 if the polygon is front facing. We want to create
1169 * a boolean result from this (1/true or 0/false).
1171 * Like in the above case, since the bit is the MSB of g1.6:UD we can use
1172 * the negation source modifier to flip it. Unfortunately the SHR
1173 * instruction only operates on UD (or D with an abs source modifier)
1174 * sources without negation.
1176 * Instead, use ASR (which will give ~0/true or 0/false).
1178 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
1181 bld
.ASR(*reg
, g1_6
, fs_reg(31));
1188 fs_visitor::compute_sample_position(fs_reg dst
, fs_reg int_sample_pos
)
1190 assert(stage
== MESA_SHADER_FRAGMENT
);
1191 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1192 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
1194 if (key
->compute_pos_offset
) {
1195 /* Convert int_sample_pos to floating point */
1196 bld
.MOV(dst
, int_sample_pos
);
1197 /* Scale to the range [0, 1] */
1198 bld
.MUL(dst
, dst
, fs_reg(1 / 16.0f
));
1201 /* From ARB_sample_shading specification:
1202 * "When rendering to a non-multisample buffer, or if multisample
1203 * rasterization is disabled, gl_SamplePosition will always be
1206 bld
.MOV(dst
, fs_reg(0.5f
));
1211 fs_visitor::emit_samplepos_setup()
1213 assert(devinfo
->gen
>= 6);
1215 const fs_builder abld
= bld
.annotate("compute sample position");
1216 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec2_type
));
1218 fs_reg int_sample_x
= vgrf(glsl_type::int_type
);
1219 fs_reg int_sample_y
= vgrf(glsl_type::int_type
);
1221 /* WM will be run in MSDISPMODE_PERSAMPLE. So, only one of SIMD8 or SIMD16
1222 * mode will be enabled.
1224 * From the Ivy Bridge PRM, volume 2 part 1, page 344:
1225 * R31.1:0 Position Offset X/Y for Slot[3:0]
1226 * R31.3:2 Position Offset X/Y for Slot[7:4]
1229 * The X, Y sample positions come in as bytes in thread payload. So, read
1230 * the positions using vstride=16, width=8, hstride=2.
1232 struct brw_reg sample_pos_reg
=
1233 stride(retype(brw_vec1_grf(payload
.sample_pos_reg
, 0),
1234 BRW_REGISTER_TYPE_B
), 16, 8, 2);
1236 if (dispatch_width
== 8) {
1237 abld
.MOV(int_sample_x
, fs_reg(sample_pos_reg
));
1239 abld
.half(0).MOV(half(int_sample_x
, 0), fs_reg(sample_pos_reg
));
1240 abld
.half(1).MOV(half(int_sample_x
, 1),
1241 fs_reg(suboffset(sample_pos_reg
, 16)));
1243 /* Compute gl_SamplePosition.x */
1244 compute_sample_position(pos
, int_sample_x
);
1245 pos
= offset(pos
, abld
, 1);
1246 if (dispatch_width
== 8) {
1247 abld
.MOV(int_sample_y
, fs_reg(suboffset(sample_pos_reg
, 1)));
1249 abld
.half(0).MOV(half(int_sample_y
, 0),
1250 fs_reg(suboffset(sample_pos_reg
, 1)));
1251 abld
.half(1).MOV(half(int_sample_y
, 1),
1252 fs_reg(suboffset(sample_pos_reg
, 17)));
1254 /* Compute gl_SamplePosition.y */
1255 compute_sample_position(pos
, int_sample_y
);
1260 fs_visitor::emit_sampleid_setup()
1262 assert(stage
== MESA_SHADER_FRAGMENT
);
1263 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1264 assert(devinfo
->gen
>= 6);
1266 const fs_builder abld
= bld
.annotate("compute sample id");
1267 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::int_type
));
1269 if (key
->compute_sample_id
) {
1270 fs_reg t1
= vgrf(glsl_type::int_type
);
1271 fs_reg t2
= vgrf(glsl_type::int_type
);
1272 t2
.type
= BRW_REGISTER_TYPE_UW
;
1274 /* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
1275 * 8x multisampling, subspan 0 will represent sample N (where N
1276 * is 0, 2, 4 or 6), subspan 1 will represent sample 1, 3, 5 or
1277 * 7. We can find the value of N by looking at R0.0 bits 7:6
1278 * ("Starting Sample Pair Index (SSPI)") and multiplying by two
1279 * (since samples are always delivered in pairs). That is, we
1280 * compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 & 0xc0) >> 5. Then
1281 * we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1) in
1282 * case of SIMD8 and sequence (0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
1283 * 2, 3, 3, 3, 3) in case of SIMD16. We compute this sequence by
1284 * populating a temporary variable with the sequence (0, 1, 2, 3),
1285 * and then reading from it using vstride=1, width=4, hstride=0.
1286 * These computations hold good for 4x multisampling as well.
1288 * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1):
1289 * the first four slots are sample 0 of subspan 0; the next four
1290 * are sample 1 of subspan 0; the third group is sample 0 of
1291 * subspan 1, and finally sample 1 of subspan 1.
1294 .AND(t1
, fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)),
1296 abld
.exec_all().SHR(t1
, t1
, fs_reg(5));
1298 /* This works for both SIMD8 and SIMD16 */
1300 .MOV(t2
, brw_imm_v(key
->persample_2x
? 0x1010 : 0x3210));
1302 /* This special instruction takes care of setting vstride=1,
1303 * width=4, hstride=0 of t2 during an ADD instruction.
1305 abld
.emit(FS_OPCODE_SET_SAMPLE_ID
, *reg
, t1
, t2
);
1307 /* As per GL_ARB_sample_shading specification:
1308 * "When rendering to a non-multisample buffer, or if multisample
1309 * rasterization is disabled, gl_SampleID will always be zero."
1311 abld
.MOV(*reg
, fs_reg(0));
1318 fs_visitor::resolve_source_modifiers(const fs_reg
&src
)
1320 if (!src
.abs
&& !src
.negate
)
1323 fs_reg temp
= bld
.vgrf(src
.type
);
1330 fs_visitor::emit_discard_jump()
1332 assert(((brw_wm_prog_data
*) this->prog_data
)->uses_kill
);
1334 /* For performance, after a discard, jump to the end of the
1335 * shader if all relevant channels have been discarded.
1337 fs_inst
*discard_jump
= bld
.emit(FS_OPCODE_DISCARD_JUMP
);
1338 discard_jump
->flag_subreg
= 1;
1340 discard_jump
->predicate
= (dispatch_width
== 8)
1341 ? BRW_PREDICATE_ALIGN1_ANY8H
1342 : BRW_PREDICATE_ALIGN1_ANY16H
;
1343 discard_jump
->predicate_inverse
= true;
1347 fs_visitor::assign_curb_setup()
1349 if (dispatch_width
== 8) {
1350 prog_data
->dispatch_grf_start_reg
= payload
.num_regs
;
1352 if (stage
== MESA_SHADER_FRAGMENT
) {
1353 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1354 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1355 } else if (stage
== MESA_SHADER_COMPUTE
) {
1356 brw_cs_prog_data
*prog_data
= (brw_cs_prog_data
*) this->prog_data
;
1357 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1359 unreachable("Unsupported shader type!");
1363 prog_data
->curb_read_length
= ALIGN(stage_prog_data
->nr_params
, 8) / 8;
1365 /* Map the offsets in the UNIFORM file to fixed HW regs. */
1366 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1367 for (unsigned int i
= 0; i
< inst
->sources
; i
++) {
1368 if (inst
->src
[i
].file
== UNIFORM
) {
1369 int uniform_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
1371 if (uniform_nr
>= 0 && uniform_nr
< (int) uniforms
) {
1372 constant_nr
= push_constant_loc
[uniform_nr
];
1374 /* Section 5.11 of the OpenGL 4.1 spec says:
1375 * "Out-of-bounds reads return undefined values, which include
1376 * values from other variables of the active program or zero."
1377 * Just return the first push constant.
1382 struct brw_reg brw_reg
= brw_vec1_grf(payload
.num_regs
+
1386 assert(inst
->src
[i
].stride
== 0);
1387 inst
->src
[i
].file
= HW_REG
;
1388 inst
->src
[i
].fixed_hw_reg
= byte_offset(
1389 retype(brw_reg
, inst
->src
[i
].type
),
1390 inst
->src
[i
].subreg_offset
);
1397 fs_visitor::calculate_urb_setup()
1399 assert(stage
== MESA_SHADER_FRAGMENT
);
1400 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1401 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1403 memset(prog_data
->urb_setup
, -1,
1404 sizeof(prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
1407 /* Figure out where each of the incoming setup attributes lands. */
1408 if (devinfo
->gen
>= 6) {
1409 if (_mesa_bitcount_64(prog
->InputsRead
&
1410 BRW_FS_VARYING_INPUT_MASK
) <= 16) {
1411 /* The SF/SBE pipeline stage can do arbitrary rearrangement of the
1412 * first 16 varying inputs, so we can put them wherever we want.
1413 * Just put them in order.
1415 * This is useful because it means that (a) inputs not used by the
1416 * fragment shader won't take up valuable register space, and (b) we
1417 * won't have to recompile the fragment shader if it gets paired with
1418 * a different vertex (or geometry) shader.
1420 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1421 if (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1422 BITFIELD64_BIT(i
)) {
1423 prog_data
->urb_setup
[i
] = urb_next
++;
1427 /* We have enough input varyings that the SF/SBE pipeline stage can't
1428 * arbitrarily rearrange them to suit our whim; we have to put them
1429 * in an order that matches the output of the previous pipeline stage
1430 * (geometry or vertex shader).
1432 struct brw_vue_map prev_stage_vue_map
;
1433 brw_compute_vue_map(devinfo
, &prev_stage_vue_map
,
1434 key
->input_slots_valid
);
1435 int first_slot
= 2 * BRW_SF_URB_ENTRY_READ_OFFSET
;
1436 assert(prev_stage_vue_map
.num_slots
<= first_slot
+ 32);
1437 for (int slot
= first_slot
; slot
< prev_stage_vue_map
.num_slots
;
1439 int varying
= prev_stage_vue_map
.slot_to_varying
[slot
];
1440 /* Note that varying == BRW_VARYING_SLOT_COUNT when a slot is
1443 if (varying
!= BRW_VARYING_SLOT_COUNT
&&
1444 (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1445 BITFIELD64_BIT(varying
))) {
1446 prog_data
->urb_setup
[varying
] = slot
- first_slot
;
1449 urb_next
= prev_stage_vue_map
.num_slots
- first_slot
;
1452 /* FINISHME: The sf doesn't map VS->FS inputs for us very well. */
1453 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1454 /* Point size is packed into the header, not as a general attribute */
1455 if (i
== VARYING_SLOT_PSIZ
)
1458 if (key
->input_slots_valid
& BITFIELD64_BIT(i
)) {
1459 /* The back color slot is skipped when the front color is
1460 * also written to. In addition, some slots can be
1461 * written in the vertex shader and not read in the
1462 * fragment shader. So the register number must always be
1463 * incremented, mapped or not.
1465 if (_mesa_varying_slot_in_fs((gl_varying_slot
) i
))
1466 prog_data
->urb_setup
[i
] = urb_next
;
1472 * It's a FS only attribute, and we did interpolation for this attribute
1473 * in SF thread. So, count it here, too.
1475 * See compile_sf_prog() for more info.
1477 if (prog
->InputsRead
& BITFIELD64_BIT(VARYING_SLOT_PNTC
))
1478 prog_data
->urb_setup
[VARYING_SLOT_PNTC
] = urb_next
++;
1481 prog_data
->num_varying_inputs
= urb_next
;
1485 fs_visitor::assign_urb_setup()
1487 assert(stage
== MESA_SHADER_FRAGMENT
);
1488 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1490 int urb_start
= payload
.num_regs
+ prog_data
->base
.curb_read_length
;
1492 /* Offset all the urb_setup[] index by the actual position of the
1493 * setup regs, now that the location of the constants has been chosen.
1495 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1496 if (inst
->opcode
== FS_OPCODE_LINTERP
) {
1497 assert(inst
->src
[1].file
== HW_REG
);
1498 inst
->src
[1].fixed_hw_reg
.nr
+= urb_start
;
1501 if (inst
->opcode
== FS_OPCODE_CINTERP
) {
1502 assert(inst
->src
[0].file
== HW_REG
);
1503 inst
->src
[0].fixed_hw_reg
.nr
+= urb_start
;
1507 /* Each attribute is 4 setup channels, each of which is half a reg. */
1508 this->first_non_payload_grf
=
1509 urb_start
+ prog_data
->num_varying_inputs
* 2;
1513 fs_visitor::assign_vs_urb_setup()
1515 brw_vs_prog_data
*vs_prog_data
= (brw_vs_prog_data
*) prog_data
;
1516 int grf
, count
, slot
, channel
, attr
;
1518 assert(stage
== MESA_SHADER_VERTEX
);
1519 count
= _mesa_bitcount_64(vs_prog_data
->inputs_read
);
1520 if (vs_prog_data
->uses_vertexid
|| vs_prog_data
->uses_instanceid
)
1523 /* Each attribute is 4 regs. */
1524 this->first_non_payload_grf
=
1525 payload
.num_regs
+ prog_data
->curb_read_length
+ count
* 4;
1527 unsigned vue_entries
=
1528 MAX2(count
, vs_prog_data
->base
.vue_map
.num_slots
);
1530 vs_prog_data
->base
.urb_entry_size
= ALIGN(vue_entries
, 4) / 4;
1531 vs_prog_data
->base
.urb_read_length
= (count
+ 1) / 2;
1533 assert(vs_prog_data
->base
.urb_read_length
<= 15);
1535 /* Rewrite all ATTR file references to the hw grf that they land in. */
1536 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1537 for (int i
= 0; i
< inst
->sources
; i
++) {
1538 if (inst
->src
[i
].file
== ATTR
) {
1540 if (inst
->src
[i
].reg
== VERT_ATTRIB_MAX
) {
1543 /* Attributes come in in a contiguous block, ordered by their
1544 * gl_vert_attrib value. That means we can compute the slot
1545 * number for an attribute by masking out the enabled
1546 * attributes before it and counting the bits.
1548 attr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
/ 4;
1549 slot
= _mesa_bitcount_64(vs_prog_data
->inputs_read
&
1550 BITFIELD64_MASK(attr
));
1553 channel
= inst
->src
[i
].reg_offset
& 3;
1555 grf
= payload
.num_regs
+
1556 prog_data
->curb_read_length
+
1559 inst
->src
[i
].file
= HW_REG
;
1560 inst
->src
[i
].fixed_hw_reg
=
1561 retype(brw_vec8_grf(grf
, 0), inst
->src
[i
].type
);
1568 * Split large virtual GRFs into separate components if we can.
1570 * This is mostly duplicated with what brw_fs_vector_splitting does,
1571 * but that's really conservative because it's afraid of doing
1572 * splitting that doesn't result in real progress after the rest of
1573 * the optimization phases, which would cause infinite looping in
1574 * optimization. We can do it once here, safely. This also has the
1575 * opportunity to split interpolated values, or maybe even uniforms,
1576 * which we don't have at the IR level.
1578 * We want to split, because virtual GRFs are what we register
1579 * allocate and spill (due to contiguousness requirements for some
1580 * instructions), and they're what we naturally generate in the
1581 * codegen process, but most virtual GRFs don't actually need to be
1582 * contiguous sets of GRFs. If we split, we'll end up with reduced
1583 * live intervals and better dead code elimination and coalescing.
1586 fs_visitor::split_virtual_grfs()
1588 int num_vars
= this->alloc
.count
;
1590 /* Count the total number of registers */
1592 int vgrf_to_reg
[num_vars
];
1593 for (int i
= 0; i
< num_vars
; i
++) {
1594 vgrf_to_reg
[i
] = reg_count
;
1595 reg_count
+= alloc
.sizes
[i
];
1598 /* An array of "split points". For each register slot, this indicates
1599 * if this slot can be separated from the previous slot. Every time an
1600 * instruction uses multiple elements of a register (as a source or
1601 * destination), we mark the used slots as inseparable. Then we go
1602 * through and split the registers into the smallest pieces we can.
1604 bool split_points
[reg_count
];
1605 memset(split_points
, 0, sizeof(split_points
));
1607 /* Mark all used registers as fully splittable */
1608 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1609 if (inst
->dst
.file
== GRF
) {
1610 int reg
= vgrf_to_reg
[inst
->dst
.reg
];
1611 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->dst
.reg
]; j
++)
1612 split_points
[reg
+ j
] = true;
1615 for (int i
= 0; i
< inst
->sources
; i
++) {
1616 if (inst
->src
[i
].file
== GRF
) {
1617 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
];
1618 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->src
[i
].reg
]; j
++)
1619 split_points
[reg
+ j
] = true;
1624 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1625 if (inst
->dst
.file
== GRF
) {
1626 int reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
1627 for (int j
= 1; j
< inst
->regs_written
; j
++)
1628 split_points
[reg
+ j
] = false;
1630 for (int i
= 0; i
< inst
->sources
; i
++) {
1631 if (inst
->src
[i
].file
== GRF
) {
1632 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
1633 for (int j
= 1; j
< inst
->regs_read(i
); j
++)
1634 split_points
[reg
+ j
] = false;
1639 int new_virtual_grf
[reg_count
];
1640 int new_reg_offset
[reg_count
];
1643 for (int i
= 0; i
< num_vars
; i
++) {
1644 /* The first one should always be 0 as a quick sanity check. */
1645 assert(split_points
[reg
] == false);
1648 new_reg_offset
[reg
] = 0;
1653 for (unsigned j
= 1; j
< alloc
.sizes
[i
]; j
++) {
1654 /* If this is a split point, reset the offset to 0 and allocate a
1655 * new virtual GRF for the previous offset many registers
1657 if (split_points
[reg
]) {
1658 assert(offset
<= MAX_VGRF_SIZE
);
1659 int grf
= alloc
.allocate(offset
);
1660 for (int k
= reg
- offset
; k
< reg
; k
++)
1661 new_virtual_grf
[k
] = grf
;
1664 new_reg_offset
[reg
] = offset
;
1669 /* The last one gets the original register number */
1670 assert(offset
<= MAX_VGRF_SIZE
);
1671 alloc
.sizes
[i
] = offset
;
1672 for (int k
= reg
- offset
; k
< reg
; k
++)
1673 new_virtual_grf
[k
] = i
;
1675 assert(reg
== reg_count
);
1677 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1678 if (inst
->dst
.file
== GRF
) {
1679 reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
1680 inst
->dst
.reg
= new_virtual_grf
[reg
];
1681 inst
->dst
.reg_offset
= new_reg_offset
[reg
];
1682 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1684 for (int i
= 0; i
< inst
->sources
; i
++) {
1685 if (inst
->src
[i
].file
== GRF
) {
1686 reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
1687 inst
->src
[i
].reg
= new_virtual_grf
[reg
];
1688 inst
->src
[i
].reg_offset
= new_reg_offset
[reg
];
1689 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
1693 invalidate_live_intervals();
1697 * Remove unused virtual GRFs and compact the virtual_grf_* arrays.
1699 * During code generation, we create tons of temporary variables, many of
1700 * which get immediately killed and are never used again. Yet, in later
1701 * optimization and analysis passes, such as compute_live_intervals, we need
1702 * to loop over all the virtual GRFs. Compacting them can save a lot of
1706 fs_visitor::compact_virtual_grfs()
1708 bool progress
= false;
1709 int remap_table
[this->alloc
.count
];
1710 memset(remap_table
, -1, sizeof(remap_table
));
1712 /* Mark which virtual GRFs are used. */
1713 foreach_block_and_inst(block
, const fs_inst
, inst
, cfg
) {
1714 if (inst
->dst
.file
== GRF
)
1715 remap_table
[inst
->dst
.reg
] = 0;
1717 for (int i
= 0; i
< inst
->sources
; i
++) {
1718 if (inst
->src
[i
].file
== GRF
)
1719 remap_table
[inst
->src
[i
].reg
] = 0;
1723 /* Compact the GRF arrays. */
1725 for (unsigned i
= 0; i
< this->alloc
.count
; i
++) {
1726 if (remap_table
[i
] == -1) {
1727 /* We just found an unused register. This means that we are
1728 * actually going to compact something.
1732 remap_table
[i
] = new_index
;
1733 alloc
.sizes
[new_index
] = alloc
.sizes
[i
];
1734 invalidate_live_intervals();
1739 this->alloc
.count
= new_index
;
1741 /* Patch all the instructions to use the newly renumbered registers */
1742 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1743 if (inst
->dst
.file
== GRF
)
1744 inst
->dst
.reg
= remap_table
[inst
->dst
.reg
];
1746 for (int i
= 0; i
< inst
->sources
; i
++) {
1747 if (inst
->src
[i
].file
== GRF
)
1748 inst
->src
[i
].reg
= remap_table
[inst
->src
[i
].reg
];
1752 /* Patch all the references to delta_xy, since they're used in register
1753 * allocation. If they're unused, switch them to BAD_FILE so we don't
1754 * think some random VGRF is delta_xy.
1756 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
1757 if (delta_xy
[i
].file
== GRF
) {
1758 if (remap_table
[delta_xy
[i
].reg
] != -1) {
1759 delta_xy
[i
].reg
= remap_table
[delta_xy
[i
].reg
];
1761 delta_xy
[i
].file
= BAD_FILE
;
1770 * Assign UNIFORM file registers to either push constants or pull constants.
1772 * We allow a fragment shader to have more than the specified minimum
1773 * maximum number of fragment shader uniform components (64). If
1774 * there are too many of these, they'd fill up all of register space.
1775 * So, this will push some of them out to the pull constant buffer and
1776 * update the program to load them. We also use pull constants for all
1777 * indirect constant loads because we don't support indirect accesses in
1781 fs_visitor::assign_constant_locations()
1783 /* Only the first compile (SIMD8 mode) gets to decide on locations. */
1784 if (dispatch_width
!= 8)
1787 unsigned int num_pull_constants
= 0;
1789 pull_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
1790 memset(pull_constant_loc
, -1, sizeof(pull_constant_loc
[0]) * uniforms
);
1792 bool is_live
[uniforms
];
1793 memset(is_live
, 0, sizeof(is_live
));
1795 /* First, we walk through the instructions and do two things:
1797 * 1) Figure out which uniforms are live.
1799 * 2) Find all indirect access of uniform arrays and flag them as needing
1800 * to go into the pull constant buffer.
1802 * Note that we don't move constant-indexed accesses to arrays. No
1803 * testing has been done of the performance impact of this choice.
1805 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
1806 for (int i
= 0 ; i
< inst
->sources
; i
++) {
1807 if (inst
->src
[i
].file
!= UNIFORM
)
1810 if (inst
->src
[i
].reladdr
) {
1811 int uniform
= inst
->src
[i
].reg
;
1813 /* If this array isn't already present in the pull constant buffer,
1816 if (pull_constant_loc
[uniform
] == -1) {
1817 assert(param_size
[uniform
]);
1818 for (int j
= 0; j
< param_size
[uniform
]; j
++)
1819 pull_constant_loc
[uniform
+ j
] = num_pull_constants
++;
1822 /* Mark the the one accessed uniform as live */
1823 int constant_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
1824 if (constant_nr
>= 0 && constant_nr
< (int) uniforms
)
1825 is_live
[constant_nr
] = true;
1830 /* Only allow 16 registers (128 uniform components) as push constants.
1832 * Just demote the end of the list. We could probably do better
1833 * here, demoting things that are rarely used in the program first.
1835 * If changing this value, note the limitation about total_regs in
1838 unsigned int max_push_components
= 16 * 8;
1839 unsigned int num_push_constants
= 0;
1841 push_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
1843 for (unsigned int i
= 0; i
< uniforms
; i
++) {
1844 if (!is_live
[i
] || pull_constant_loc
[i
] != -1) {
1845 /* This UNIFORM register is either dead, or has already been demoted
1846 * to a pull const. Mark it as no longer living in the param[] array.
1848 push_constant_loc
[i
] = -1;
1852 if (num_push_constants
< max_push_components
) {
1853 /* Retain as a push constant. Record the location in the params[]
1856 push_constant_loc
[i
] = num_push_constants
++;
1858 /* Demote to a pull constant. */
1859 push_constant_loc
[i
] = -1;
1860 pull_constant_loc
[i
] = num_pull_constants
++;
1864 stage_prog_data
->nr_params
= num_push_constants
;
1865 stage_prog_data
->nr_pull_params
= num_pull_constants
;
1867 /* Up until now, the param[] array has been indexed by reg + reg_offset
1868 * of UNIFORM registers. Move pull constants into pull_param[] and
1869 * condense param[] to only contain the uniforms we chose to push.
1871 * NOTE: Because we are condensing the params[] array, we know that
1872 * push_constant_loc[i] <= i and we can do it in one smooth loop without
1873 * having to make a copy.
1875 for (unsigned int i
= 0; i
< uniforms
; i
++) {
1876 const gl_constant_value
*value
= stage_prog_data
->param
[i
];
1878 if (pull_constant_loc
[i
] != -1) {
1879 stage_prog_data
->pull_param
[pull_constant_loc
[i
]] = value
;
1880 } else if (push_constant_loc
[i
] != -1) {
1881 stage_prog_data
->param
[push_constant_loc
[i
]] = value
;
1887 * Replace UNIFORM register file access with either UNIFORM_PULL_CONSTANT_LOAD
1888 * or VARYING_PULL_CONSTANT_LOAD instructions which load values into VGRFs.
1891 fs_visitor::demote_pull_constants()
1893 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
1894 for (int i
= 0; i
< inst
->sources
; i
++) {
1895 if (inst
->src
[i
].file
!= UNIFORM
)
1899 unsigned location
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
1900 if (location
>= uniforms
) /* Out of bounds access */
1903 pull_index
= pull_constant_loc
[location
];
1905 if (pull_index
== -1)
1908 /* Set up the annotation tracking for new generated instructions. */
1909 const fs_builder
ibld(this, block
, inst
);
1910 fs_reg
surf_index(stage_prog_data
->binding_table
.pull_constants_start
);
1911 fs_reg dst
= vgrf(glsl_type::float_type
);
1913 assert(inst
->src
[i
].stride
== 0);
1915 /* Generate a pull load into dst. */
1916 if (inst
->src
[i
].reladdr
) {
1917 VARYING_PULL_CONSTANT_LOAD(ibld
, dst
,
1919 *inst
->src
[i
].reladdr
,
1921 inst
->src
[i
].reladdr
= NULL
;
1922 inst
->src
[i
].stride
= 1;
1924 const fs_builder ubld
= ibld
.exec_all().group(8, 0);
1925 fs_reg offset
= fs_reg((unsigned)(pull_index
* 4) & ~15);
1926 ubld
.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
,
1927 dst
, surf_index
, offset
);
1928 inst
->src
[i
].set_smear(pull_index
& 3);
1931 /* Rewrite the instruction to use the temporary VGRF. */
1932 inst
->src
[i
].file
= GRF
;
1933 inst
->src
[i
].reg
= dst
.reg
;
1934 inst
->src
[i
].reg_offset
= 0;
1937 invalidate_live_intervals();
1941 fs_visitor::opt_algebraic()
1943 bool progress
= false;
1945 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1946 switch (inst
->opcode
) {
1947 case BRW_OPCODE_MOV
:
1948 if (inst
->src
[0].file
!= IMM
)
1951 if (inst
->saturate
) {
1952 if (inst
->dst
.type
!= inst
->src
[0].type
)
1953 assert(!"unimplemented: saturate mixed types");
1955 if (brw_saturate_immediate(inst
->dst
.type
,
1956 &inst
->src
[0].fixed_hw_reg
)) {
1957 inst
->saturate
= false;
1963 case BRW_OPCODE_MUL
:
1964 if (inst
->src
[1].file
!= IMM
)
1968 if (inst
->src
[1].is_one()) {
1969 inst
->opcode
= BRW_OPCODE_MOV
;
1970 inst
->src
[1] = reg_undef
;
1976 if (inst
->src
[1].is_negative_one()) {
1977 inst
->opcode
= BRW_OPCODE_MOV
;
1978 inst
->src
[0].negate
= !inst
->src
[0].negate
;
1979 inst
->src
[1] = reg_undef
;
1985 if (inst
->src
[1].is_zero()) {
1986 inst
->opcode
= BRW_OPCODE_MOV
;
1987 inst
->src
[0] = inst
->src
[1];
1988 inst
->src
[1] = reg_undef
;
1993 if (inst
->src
[0].file
== IMM
) {
1994 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
1995 inst
->opcode
= BRW_OPCODE_MOV
;
1996 inst
->src
[0].fixed_hw_reg
.dw1
.f
*= inst
->src
[1].fixed_hw_reg
.dw1
.f
;
1997 inst
->src
[1] = reg_undef
;
2002 case BRW_OPCODE_ADD
:
2003 if (inst
->src
[1].file
!= IMM
)
2007 if (inst
->src
[1].is_zero()) {
2008 inst
->opcode
= BRW_OPCODE_MOV
;
2009 inst
->src
[1] = reg_undef
;
2014 if (inst
->src
[0].file
== IMM
) {
2015 assert(inst
->src
[0].type
== BRW_REGISTER_TYPE_F
);
2016 inst
->opcode
= BRW_OPCODE_MOV
;
2017 inst
->src
[0].fixed_hw_reg
.dw1
.f
+= inst
->src
[1].fixed_hw_reg
.dw1
.f
;
2018 inst
->src
[1] = reg_undef
;
2024 if (inst
->src
[0].equals(inst
->src
[1])) {
2025 inst
->opcode
= BRW_OPCODE_MOV
;
2026 inst
->src
[1] = reg_undef
;
2031 case BRW_OPCODE_LRP
:
2032 if (inst
->src
[1].equals(inst
->src
[2])) {
2033 inst
->opcode
= BRW_OPCODE_MOV
;
2034 inst
->src
[0] = inst
->src
[1];
2035 inst
->src
[1] = reg_undef
;
2036 inst
->src
[2] = reg_undef
;
2041 case BRW_OPCODE_CMP
:
2042 if (inst
->conditional_mod
== BRW_CONDITIONAL_GE
&&
2044 inst
->src
[0].negate
&&
2045 inst
->src
[1].is_zero()) {
2046 inst
->src
[0].abs
= false;
2047 inst
->src
[0].negate
= false;
2048 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2053 case BRW_OPCODE_SEL
:
2054 if (inst
->src
[0].equals(inst
->src
[1])) {
2055 inst
->opcode
= BRW_OPCODE_MOV
;
2056 inst
->src
[1] = reg_undef
;
2057 inst
->predicate
= BRW_PREDICATE_NONE
;
2058 inst
->predicate_inverse
= false;
2060 } else if (inst
->saturate
&& inst
->src
[1].file
== IMM
) {
2061 switch (inst
->conditional_mod
) {
2062 case BRW_CONDITIONAL_LE
:
2063 case BRW_CONDITIONAL_L
:
2064 switch (inst
->src
[1].type
) {
2065 case BRW_REGISTER_TYPE_F
:
2066 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
>= 1.0f
) {
2067 inst
->opcode
= BRW_OPCODE_MOV
;
2068 inst
->src
[1] = reg_undef
;
2069 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2077 case BRW_CONDITIONAL_GE
:
2078 case BRW_CONDITIONAL_G
:
2079 switch (inst
->src
[1].type
) {
2080 case BRW_REGISTER_TYPE_F
:
2081 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
<= 0.0f
) {
2082 inst
->opcode
= BRW_OPCODE_MOV
;
2083 inst
->src
[1] = reg_undef
;
2084 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2096 case BRW_OPCODE_MAD
:
2097 if (inst
->src
[1].is_zero() || inst
->src
[2].is_zero()) {
2098 inst
->opcode
= BRW_OPCODE_MOV
;
2099 inst
->src
[1] = reg_undef
;
2100 inst
->src
[2] = reg_undef
;
2102 } else if (inst
->src
[0].is_zero()) {
2103 inst
->opcode
= BRW_OPCODE_MUL
;
2104 inst
->src
[0] = inst
->src
[2];
2105 inst
->src
[2] = reg_undef
;
2107 } else if (inst
->src
[1].is_one()) {
2108 inst
->opcode
= BRW_OPCODE_ADD
;
2109 inst
->src
[1] = inst
->src
[2];
2110 inst
->src
[2] = reg_undef
;
2112 } else if (inst
->src
[2].is_one()) {
2113 inst
->opcode
= BRW_OPCODE_ADD
;
2114 inst
->src
[2] = reg_undef
;
2116 } else if (inst
->src
[1].file
== IMM
&& inst
->src
[2].file
== IMM
) {
2117 inst
->opcode
= BRW_OPCODE_ADD
;
2118 inst
->src
[1].fixed_hw_reg
.dw1
.f
*= inst
->src
[2].fixed_hw_reg
.dw1
.f
;
2119 inst
->src
[2] = reg_undef
;
2123 case SHADER_OPCODE_RCP
: {
2124 fs_inst
*prev
= (fs_inst
*)inst
->prev
;
2125 if (prev
->opcode
== SHADER_OPCODE_SQRT
) {
2126 if (inst
->src
[0].equals(prev
->dst
)) {
2127 inst
->opcode
= SHADER_OPCODE_RSQ
;
2128 inst
->src
[0] = prev
->src
[0];
2134 case SHADER_OPCODE_BROADCAST
:
2135 if (is_uniform(inst
->src
[0])) {
2136 inst
->opcode
= BRW_OPCODE_MOV
;
2138 inst
->force_writemask_all
= true;
2140 } else if (inst
->src
[1].file
== IMM
) {
2141 inst
->opcode
= BRW_OPCODE_MOV
;
2142 inst
->src
[0] = component(inst
->src
[0],
2143 inst
->src
[1].fixed_hw_reg
.dw1
.ud
);
2145 inst
->force_writemask_all
= true;
2154 /* Swap if src[0] is immediate. */
2155 if (progress
&& inst
->is_commutative()) {
2156 if (inst
->src
[0].file
== IMM
) {
2157 fs_reg tmp
= inst
->src
[1];
2158 inst
->src
[1] = inst
->src
[0];
2167 * Optimize sample messages that have constant zero values for the trailing
2168 * texture coordinates. We can just reduce the message length for these
2169 * instructions instead of reserving a register for it. Trailing parameters
2170 * that aren't sent default to zero anyway. This will cause the dead code
2171 * eliminator to remove the MOV instruction that would otherwise be emitted to
2172 * set up the zero value.
2175 fs_visitor::opt_zero_samples()
2177 /* Gen4 infers the texturing opcode based on the message length so we can't
2180 if (devinfo
->gen
< 5)
2183 bool progress
= false;
2185 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2186 if (!inst
->is_tex())
2189 fs_inst
*load_payload
= (fs_inst
*) inst
->prev
;
2191 if (load_payload
->is_head_sentinel() ||
2192 load_payload
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
2195 /* We don't want to remove the message header or the first parameter.
2196 * Removing the first parameter is not allowed, see the Haswell PRM
2197 * volume 7, page 149:
2199 * "Parameter 0 is required except for the sampleinfo message, which
2200 * has no parameter 0"
2202 while (inst
->mlen
> inst
->header_size
+ inst
->exec_size
/ 8 &&
2203 load_payload
->src
[(inst
->mlen
- inst
->header_size
) /
2204 (inst
->exec_size
/ 8) +
2205 inst
->header_size
- 1].is_zero()) {
2206 inst
->mlen
-= inst
->exec_size
/ 8;
2212 invalidate_live_intervals();
2218 * Optimize sample messages which are followed by the final RT write.
2220 * CHV, and GEN9+ can mark a texturing SEND instruction with EOT to have its
2221 * results sent directly to the framebuffer, bypassing the EU. Recognize the
2222 * final texturing results copied to the framebuffer write payload and modify
2223 * them to write to the framebuffer directly.
2226 fs_visitor::opt_sampler_eot()
2228 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2230 if (stage
!= MESA_SHADER_FRAGMENT
)
2233 if (devinfo
->gen
< 9 && !devinfo
->is_cherryview
)
2236 /* FINISHME: It should be possible to implement this optimization when there
2237 * are multiple drawbuffers.
2239 if (key
->nr_color_regions
!= 1)
2242 /* Look for a texturing instruction immediately before the final FB_WRITE. */
2243 bblock_t
*block
= cfg
->blocks
[cfg
->num_blocks
- 1];
2244 fs_inst
*fb_write
= (fs_inst
*)block
->end();
2245 assert(fb_write
->eot
);
2246 assert(fb_write
->opcode
== FS_OPCODE_FB_WRITE
);
2248 fs_inst
*tex_inst
= (fs_inst
*) fb_write
->prev
;
2250 /* There wasn't one; nothing to do. */
2251 if (unlikely(tex_inst
->is_head_sentinel()) || !tex_inst
->is_tex())
2254 /* This optimisation doesn't seem to work for textureGather for some
2255 * reason. I can't find any documentation or known workarounds to indicate
2256 * that this is expected, but considering that it is probably pretty
2257 * unlikely that a shader would directly write out the results from
2258 * textureGather we might as well just disable it.
2260 if (tex_inst
->opcode
== SHADER_OPCODE_TG4
||
2261 tex_inst
->opcode
== SHADER_OPCODE_TG4_OFFSET
)
2264 /* If there's no header present, we need to munge the LOAD_PAYLOAD as well.
2265 * It's very likely to be the previous instruction.
2267 fs_inst
*load_payload
= (fs_inst
*) tex_inst
->prev
;
2268 if (load_payload
->is_head_sentinel() ||
2269 load_payload
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
2272 assert(!tex_inst
->eot
); /* We can't get here twice */
2273 assert((tex_inst
->offset
& (0xff << 24)) == 0);
2275 const fs_builder
ibld(this, block
, tex_inst
);
2277 tex_inst
->offset
|= fb_write
->target
<< 24;
2278 tex_inst
->eot
= true;
2279 tex_inst
->dst
= ibld
.null_reg_ud();
2280 fb_write
->remove(cfg
->blocks
[cfg
->num_blocks
- 1]);
2282 /* If a header is present, marking the eot is sufficient. Otherwise, we need
2283 * to create a new LOAD_PAYLOAD command with the same sources and a space
2284 * saved for the header. Using a new destination register not only makes sure
2285 * we have enough space, but it will make sure the dead code eliminator kills
2286 * the instruction that this will replace.
2288 if (tex_inst
->header_size
!= 0)
2291 fs_reg send_header
= ibld
.vgrf(BRW_REGISTER_TYPE_F
,
2292 load_payload
->sources
+ 1);
2293 fs_reg
*new_sources
=
2294 ralloc_array(mem_ctx
, fs_reg
, load_payload
->sources
+ 1);
2296 new_sources
[0] = fs_reg();
2297 for (int i
= 0; i
< load_payload
->sources
; i
++)
2298 new_sources
[i
+1] = load_payload
->src
[i
];
2300 /* The LOAD_PAYLOAD helper seems like the obvious choice here. However, it
2301 * requires a lot of information about the sources to appropriately figure
2302 * out the number of registers needed to be used. Given this stage in our
2303 * optimization, we may not have the appropriate GRFs required by
2304 * LOAD_PAYLOAD at this point (copy propagation). Therefore, we need to
2305 * manually emit the instruction.
2307 fs_inst
*new_load_payload
= new(mem_ctx
) fs_inst(SHADER_OPCODE_LOAD_PAYLOAD
,
2308 load_payload
->exec_size
,
2311 load_payload
->sources
+ 1);
2313 new_load_payload
->regs_written
= load_payload
->regs_written
+ 1;
2314 new_load_payload
->header_size
= 1;
2316 tex_inst
->header_size
= 1;
2317 tex_inst
->insert_before(cfg
->blocks
[cfg
->num_blocks
- 1], new_load_payload
);
2318 tex_inst
->src
[0] = send_header
;
2324 fs_visitor::opt_register_renaming()
2326 bool progress
= false;
2329 int remap
[alloc
.count
];
2330 memset(remap
, -1, sizeof(int) * alloc
.count
);
2332 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2333 if (inst
->opcode
== BRW_OPCODE_IF
|| inst
->opcode
== BRW_OPCODE_DO
) {
2335 } else if (inst
->opcode
== BRW_OPCODE_ENDIF
||
2336 inst
->opcode
== BRW_OPCODE_WHILE
) {
2340 /* Rewrite instruction sources. */
2341 for (int i
= 0; i
< inst
->sources
; i
++) {
2342 if (inst
->src
[i
].file
== GRF
&&
2343 remap
[inst
->src
[i
].reg
] != -1 &&
2344 remap
[inst
->src
[i
].reg
] != inst
->src
[i
].reg
) {
2345 inst
->src
[i
].reg
= remap
[inst
->src
[i
].reg
];
2350 const int dst
= inst
->dst
.reg
;
2353 inst
->dst
.file
== GRF
&&
2354 alloc
.sizes
[inst
->dst
.reg
] == inst
->exec_size
/ 8 &&
2355 !inst
->is_partial_write()) {
2356 if (remap
[dst
] == -1) {
2359 remap
[dst
] = alloc
.allocate(inst
->exec_size
/ 8);
2360 inst
->dst
.reg
= remap
[dst
];
2363 } else if (inst
->dst
.file
== GRF
&&
2365 remap
[dst
] != dst
) {
2366 inst
->dst
.reg
= remap
[dst
];
2372 invalidate_live_intervals();
2374 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_xy
); i
++) {
2375 if (delta_xy
[i
].file
== GRF
&& remap
[delta_xy
[i
].reg
] != -1) {
2376 delta_xy
[i
].reg
= remap
[delta_xy
[i
].reg
];
2385 * Remove redundant or useless discard jumps.
2387 * For example, we can eliminate jumps in the following sequence:
2389 * discard-jump (redundant with the next jump)
2390 * discard-jump (useless; jumps to the next instruction)
2394 fs_visitor::opt_redundant_discard_jumps()
2396 bool progress
= false;
2398 bblock_t
*last_bblock
= cfg
->blocks
[cfg
->num_blocks
- 1];
2400 fs_inst
*placeholder_halt
= NULL
;
2401 foreach_inst_in_block_reverse(fs_inst
, inst
, last_bblock
) {
2402 if (inst
->opcode
== FS_OPCODE_PLACEHOLDER_HALT
) {
2403 placeholder_halt
= inst
;
2408 if (!placeholder_halt
)
2411 /* Delete any HALTs immediately before the placeholder halt. */
2412 for (fs_inst
*prev
= (fs_inst
*) placeholder_halt
->prev
;
2413 !prev
->is_head_sentinel() && prev
->opcode
== FS_OPCODE_DISCARD_JUMP
;
2414 prev
= (fs_inst
*) placeholder_halt
->prev
) {
2415 prev
->remove(last_bblock
);
2420 invalidate_live_intervals();
2426 fs_visitor::compute_to_mrf()
2428 bool progress
= false;
2431 /* No MRFs on Gen >= 7. */
2432 if (devinfo
->gen
>= 7)
2435 calculate_live_intervals();
2437 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2441 if (inst
->opcode
!= BRW_OPCODE_MOV
||
2442 inst
->is_partial_write() ||
2443 inst
->dst
.file
!= MRF
|| inst
->src
[0].file
!= GRF
||
2444 inst
->dst
.type
!= inst
->src
[0].type
||
2445 inst
->src
[0].abs
|| inst
->src
[0].negate
||
2446 !inst
->src
[0].is_contiguous() ||
2447 inst
->src
[0].subreg_offset
)
2450 /* Work out which hardware MRF registers are written by this
2453 int mrf_low
= inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2455 if (inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2456 mrf_high
= mrf_low
+ 4;
2457 } else if (inst
->exec_size
== 16) {
2458 mrf_high
= mrf_low
+ 1;
2463 /* Can't compute-to-MRF this GRF if someone else was going to
2466 if (this->virtual_grf_end
[inst
->src
[0].reg
] > ip
)
2469 /* Found a move of a GRF to a MRF. Let's see if we can go
2470 * rewrite the thing that made this GRF to write into the MRF.
2472 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2473 if (scan_inst
->dst
.file
== GRF
&&
2474 scan_inst
->dst
.reg
== inst
->src
[0].reg
) {
2475 /* Found the last thing to write our reg we want to turn
2476 * into a compute-to-MRF.
2479 /* If this one instruction didn't populate all the
2480 * channels, bail. We might be able to rewrite everything
2481 * that writes that reg, but it would require smarter
2482 * tracking to delay the rewriting until complete success.
2484 if (scan_inst
->is_partial_write())
2487 /* Things returning more than one register would need us to
2488 * understand coalescing out more than one MOV at a time.
2490 if (scan_inst
->regs_written
> scan_inst
->exec_size
/ 8)
2493 /* SEND instructions can't have MRF as a destination. */
2494 if (scan_inst
->mlen
)
2497 if (devinfo
->gen
== 6) {
2498 /* gen6 math instructions must have the destination be
2499 * GRF, so no compute-to-MRF for them.
2501 if (scan_inst
->is_math()) {
2506 if (scan_inst
->dst
.reg_offset
== inst
->src
[0].reg_offset
) {
2507 /* Found the creator of our MRF's source value. */
2508 scan_inst
->dst
.file
= MRF
;
2509 scan_inst
->dst
.reg
= inst
->dst
.reg
;
2510 scan_inst
->saturate
|= inst
->saturate
;
2511 inst
->remove(block
);
2517 /* We don't handle control flow here. Most computation of
2518 * values that end up in MRFs are shortly before the MRF
2521 if (block
->start() == scan_inst
)
2524 /* You can't read from an MRF, so if someone else reads our
2525 * MRF's source GRF that we wanted to rewrite, that stops us.
2527 bool interfered
= false;
2528 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
2529 if (scan_inst
->src
[i
].file
== GRF
&&
2530 scan_inst
->src
[i
].reg
== inst
->src
[0].reg
&&
2531 scan_inst
->src
[i
].reg_offset
== inst
->src
[0].reg_offset
) {
2538 if (scan_inst
->dst
.file
== MRF
) {
2539 /* If somebody else writes our MRF here, we can't
2540 * compute-to-MRF before that.
2542 int scan_mrf_low
= scan_inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2545 if (scan_inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2546 scan_mrf_high
= scan_mrf_low
+ 4;
2547 } else if (scan_inst
->exec_size
== 16) {
2548 scan_mrf_high
= scan_mrf_low
+ 1;
2550 scan_mrf_high
= scan_mrf_low
;
2553 if (mrf_low
== scan_mrf_low
||
2554 mrf_low
== scan_mrf_high
||
2555 mrf_high
== scan_mrf_low
||
2556 mrf_high
== scan_mrf_high
) {
2561 if (scan_inst
->mlen
> 0 && scan_inst
->base_mrf
!= -1) {
2562 /* Found a SEND instruction, which means that there are
2563 * live values in MRFs from base_mrf to base_mrf +
2564 * scan_inst->mlen - 1. Don't go pushing our MRF write up
2567 if (mrf_low
>= scan_inst
->base_mrf
&&
2568 mrf_low
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2571 if (mrf_high
>= scan_inst
->base_mrf
&&
2572 mrf_high
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2580 invalidate_live_intervals();
2586 * Eliminate FIND_LIVE_CHANNEL instructions occurring outside any control
2587 * flow. We could probably do better here with some form of divergence
2591 fs_visitor::eliminate_find_live_channel()
2593 bool progress
= false;
2596 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2597 switch (inst
->opcode
) {
2603 case BRW_OPCODE_ENDIF
:
2604 case BRW_OPCODE_WHILE
:
2608 case FS_OPCODE_DISCARD_JUMP
:
2609 /* This can potentially make control flow non-uniform until the end
2614 case SHADER_OPCODE_FIND_LIVE_CHANNEL
:
2616 inst
->opcode
= BRW_OPCODE_MOV
;
2617 inst
->src
[0] = fs_reg(0);
2619 inst
->force_writemask_all
= true;
2633 * Once we've generated code, try to convert normal FS_OPCODE_FB_WRITE
2634 * instructions to FS_OPCODE_REP_FB_WRITE.
2637 fs_visitor::emit_repclear_shader()
2639 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2641 int color_mrf
= base_mrf
+ 2;
2643 fs_inst
*mov
= bld
.exec_all().MOV(vec4(brw_message_reg(color_mrf
)),
2644 fs_reg(UNIFORM
, 0, BRW_REGISTER_TYPE_F
));
2647 if (key
->nr_color_regions
== 1) {
2648 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
2649 write
->saturate
= key
->clamp_fragment_color
;
2650 write
->base_mrf
= color_mrf
;
2652 write
->header_size
= 0;
2655 assume(key
->nr_color_regions
> 0);
2656 for (int i
= 0; i
< key
->nr_color_regions
; ++i
) {
2657 write
= bld
.emit(FS_OPCODE_REP_FB_WRITE
);
2658 write
->saturate
= key
->clamp_fragment_color
;
2659 write
->base_mrf
= base_mrf
;
2661 write
->header_size
= 2;
2669 assign_constant_locations();
2670 assign_curb_setup();
2672 /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
2673 assert(mov
->src
[0].file
== HW_REG
);
2674 mov
->src
[0] = brw_vec4_grf(mov
->src
[0].fixed_hw_reg
.nr
, 0);
2678 * Walks through basic blocks, looking for repeated MRF writes and
2679 * removing the later ones.
2682 fs_visitor::remove_duplicate_mrf_writes()
2684 fs_inst
*last_mrf_move
[16];
2685 bool progress
= false;
2687 /* Need to update the MRF tracking for compressed instructions. */
2688 if (dispatch_width
== 16)
2691 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2693 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2694 if (inst
->is_control_flow()) {
2695 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2698 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2699 inst
->dst
.file
== MRF
) {
2700 fs_inst
*prev_inst
= last_mrf_move
[inst
->dst
.reg
];
2701 if (prev_inst
&& inst
->equals(prev_inst
)) {
2702 inst
->remove(block
);
2708 /* Clear out the last-write records for MRFs that were overwritten. */
2709 if (inst
->dst
.file
== MRF
) {
2710 last_mrf_move
[inst
->dst
.reg
] = NULL
;
2713 if (inst
->mlen
> 0 && inst
->base_mrf
!= -1) {
2714 /* Found a SEND instruction, which will include two or fewer
2715 * implied MRF writes. We could do better here.
2717 for (int i
= 0; i
< implied_mrf_writes(inst
); i
++) {
2718 last_mrf_move
[inst
->base_mrf
+ i
] = NULL
;
2722 /* Clear out any MRF move records whose sources got overwritten. */
2723 if (inst
->dst
.file
== GRF
) {
2724 for (unsigned int i
= 0; i
< ARRAY_SIZE(last_mrf_move
); i
++) {
2725 if (last_mrf_move
[i
] &&
2726 last_mrf_move
[i
]->src
[0].reg
== inst
->dst
.reg
) {
2727 last_mrf_move
[i
] = NULL
;
2732 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2733 inst
->dst
.file
== MRF
&&
2734 inst
->src
[0].file
== GRF
&&
2735 !inst
->is_partial_write()) {
2736 last_mrf_move
[inst
->dst
.reg
] = inst
;
2741 invalidate_live_intervals();
2747 clear_deps_for_inst_src(fs_inst
*inst
, bool *deps
, int first_grf
, int grf_len
)
2749 /* Clear the flag for registers that actually got read (as expected). */
2750 for (int i
= 0; i
< inst
->sources
; i
++) {
2752 if (inst
->src
[i
].file
== GRF
) {
2753 grf
= inst
->src
[i
].reg
;
2754 } else if (inst
->src
[i
].file
== HW_REG
&&
2755 inst
->src
[i
].fixed_hw_reg
.file
== BRW_GENERAL_REGISTER_FILE
) {
2756 grf
= inst
->src
[i
].fixed_hw_reg
.nr
;
2761 if (grf
>= first_grf
&&
2762 grf
< first_grf
+ grf_len
) {
2763 deps
[grf
- first_grf
] = false;
2764 if (inst
->exec_size
== 16)
2765 deps
[grf
- first_grf
+ 1] = false;
2771 * Implements this workaround for the original 965:
2773 * "[DevBW, DevCL] Implementation Restrictions: As the hardware does not
2774 * check for post destination dependencies on this instruction, software
2775 * must ensure that there is no destination hazard for the case of ‘write
2776 * followed by a posted write’ shown in the following example.
2779 * 2. send r3.xy <rest of send instruction>
2782 * Due to no post-destination dependency check on the ‘send’, the above
2783 * code sequence could have two instructions (1 and 2) in flight at the
2784 * same time that both consider ‘r3’ as the target of their final writes.
2787 fs_visitor::insert_gen4_pre_send_dependency_workarounds(bblock_t
*block
,
2790 int write_len
= inst
->regs_written
;
2791 int first_write_grf
= inst
->dst
.reg
;
2792 bool needs_dep
[BRW_MAX_MRF
];
2793 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2795 memset(needs_dep
, false, sizeof(needs_dep
));
2796 memset(needs_dep
, true, write_len
);
2798 clear_deps_for_inst_src(inst
, needs_dep
, first_write_grf
, write_len
);
2800 /* Walk backwards looking for writes to registers we're writing which
2801 * aren't read since being written. If we hit the start of the program,
2802 * we assume that there are no outstanding dependencies on entry to the
2805 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2806 /* If we hit control flow, assume that there *are* outstanding
2807 * dependencies, and force their cleanup before our instruction.
2809 if (block
->start() == scan_inst
) {
2810 for (int i
= 0; i
< write_len
; i
++) {
2812 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
),
2813 first_write_grf
+ i
);
2818 /* We insert our reads as late as possible on the assumption that any
2819 * instruction but a MOV that might have left us an outstanding
2820 * dependency has more latency than a MOV.
2822 if (scan_inst
->dst
.file
== GRF
) {
2823 for (int i
= 0; i
< scan_inst
->regs_written
; i
++) {
2824 int reg
= scan_inst
->dst
.reg
+ i
;
2826 if (reg
>= first_write_grf
&&
2827 reg
< first_write_grf
+ write_len
&&
2828 needs_dep
[reg
- first_write_grf
]) {
2829 DEP_RESOLVE_MOV(fs_builder(this, block
, inst
), reg
);
2830 needs_dep
[reg
- first_write_grf
] = false;
2831 if (scan_inst
->exec_size
== 16)
2832 needs_dep
[reg
- first_write_grf
+ 1] = false;
2837 /* Clear the flag for registers that actually got read (as expected). */
2838 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
2840 /* Continue the loop only if we haven't resolved all the dependencies */
2842 for (i
= 0; i
< write_len
; i
++) {
2852 * Implements this workaround for the original 965:
2854 * "[DevBW, DevCL] Errata: A destination register from a send can not be
2855 * used as a destination register until after it has been sourced by an
2856 * instruction with a different destination register.
2859 fs_visitor::insert_gen4_post_send_dependency_workarounds(bblock_t
*block
, fs_inst
*inst
)
2861 int write_len
= inst
->regs_written
;
2862 int first_write_grf
= inst
->dst
.reg
;
2863 bool needs_dep
[BRW_MAX_MRF
];
2864 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2866 memset(needs_dep
, false, sizeof(needs_dep
));
2867 memset(needs_dep
, true, write_len
);
2868 /* Walk forwards looking for writes to registers we're writing which aren't
2869 * read before being written.
2871 foreach_inst_in_block_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2872 /* If we hit control flow, force resolve all remaining dependencies. */
2873 if (block
->end() == scan_inst
) {
2874 for (int i
= 0; i
< write_len
; i
++) {
2876 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
2877 first_write_grf
+ i
);
2882 /* Clear the flag for registers that actually got read (as expected). */
2883 clear_deps_for_inst_src(scan_inst
, needs_dep
, first_write_grf
, write_len
);
2885 /* We insert our reads as late as possible since they're reading the
2886 * result of a SEND, which has massive latency.
2888 if (scan_inst
->dst
.file
== GRF
&&
2889 scan_inst
->dst
.reg
>= first_write_grf
&&
2890 scan_inst
->dst
.reg
< first_write_grf
+ write_len
&&
2891 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
]) {
2892 DEP_RESOLVE_MOV(fs_builder(this, block
, scan_inst
),
2893 scan_inst
->dst
.reg
);
2894 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
] = false;
2897 /* Continue the loop only if we haven't resolved all the dependencies */
2899 for (i
= 0; i
< write_len
; i
++) {
2909 fs_visitor::insert_gen4_send_dependency_workarounds()
2911 if (devinfo
->gen
!= 4 || devinfo
->is_g4x
)
2914 bool progress
= false;
2916 /* Note that we're done with register allocation, so GRF fs_regs always
2917 * have a .reg_offset of 0.
2920 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2921 if (inst
->mlen
!= 0 && inst
->dst
.file
== GRF
) {
2922 insert_gen4_pre_send_dependency_workarounds(block
, inst
);
2923 insert_gen4_post_send_dependency_workarounds(block
, inst
);
2929 invalidate_live_intervals();
2933 * Turns the generic expression-style uniform pull constant load instruction
2934 * into a hardware-specific series of instructions for loading a pull
2937 * The expression style allows the CSE pass before this to optimize out
2938 * repeated loads from the same offset, and gives the pre-register-allocation
2939 * scheduling full flexibility, while the conversion to native instructions
2940 * allows the post-register-allocation scheduler the best information
2943 * Note that execution masking for setting up pull constant loads is special:
2944 * the channels that need to be written are unrelated to the current execution
2945 * mask, since a later instruction will use one of the result channels as a
2946 * source operand for all 8 or 16 of its channels.
2949 fs_visitor::lower_uniform_pull_constant_loads()
2951 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
2952 if (inst
->opcode
!= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
)
2955 if (devinfo
->gen
>= 7) {
2956 /* The offset arg before was a vec4-aligned byte offset. We need to
2957 * turn it into a dword offset.
2959 fs_reg const_offset_reg
= inst
->src
[1];
2960 assert(const_offset_reg
.file
== IMM
&&
2961 const_offset_reg
.type
== BRW_REGISTER_TYPE_UD
);
2962 const_offset_reg
.fixed_hw_reg
.dw1
.ud
/= 4;
2964 fs_reg payload
, offset
;
2965 if (devinfo
->gen
>= 9) {
2966 /* We have to use a message header on Skylake to get SIMD4x2
2967 * mode. Reserve space for the register.
2969 offset
= payload
= fs_reg(GRF
, alloc
.allocate(2));
2970 offset
.reg_offset
++;
2973 offset
= payload
= fs_reg(GRF
, alloc
.allocate(1));
2977 /* This is actually going to be a MOV, but since only the first dword
2978 * is accessed, we have a special opcode to do just that one. Note
2979 * that this needs to be an operation that will be considered a def
2980 * by live variable analysis, or register allocation will explode.
2982 fs_inst
*setup
= new(mem_ctx
) fs_inst(FS_OPCODE_SET_SIMD4X2_OFFSET
,
2983 8, offset
, const_offset_reg
);
2984 setup
->force_writemask_all
= true;
2986 setup
->ir
= inst
->ir
;
2987 setup
->annotation
= inst
->annotation
;
2988 inst
->insert_before(block
, setup
);
2990 /* Similarly, this will only populate the first 4 channels of the
2991 * result register (since we only use smear values from 0-3), but we
2992 * don't tell the optimizer.
2994 inst
->opcode
= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
;
2995 inst
->src
[1] = payload
;
2996 inst
->base_mrf
= -1;
2998 invalidate_live_intervals();
3000 /* Before register allocation, we didn't tell the scheduler about the
3001 * MRF we use. We know it's safe to use this MRF because nothing
3002 * else does except for register spill/unspill, which generates and
3003 * uses its MRF within a single IR instruction.
3005 inst
->base_mrf
= 14;
3012 fs_visitor::lower_load_payload()
3014 bool progress
= false;
3016 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3017 if (inst
->opcode
!= SHADER_OPCODE_LOAD_PAYLOAD
)
3020 assert(inst
->dst
.file
== MRF
|| inst
->dst
.file
== GRF
);
3021 assert(inst
->saturate
== false);
3022 fs_reg dst
= inst
->dst
;
3024 /* Get rid of COMPR4. We'll add it back in if we need it */
3025 if (dst
.file
== MRF
)
3026 dst
.reg
= dst
.reg
& ~BRW_MRF_COMPR4
;
3028 const fs_builder
ibld(this, block
, inst
);
3029 const fs_builder hbld
= ibld
.exec_all().group(8, 0);
3031 for (uint8_t i
= 0; i
< inst
->header_size
; i
++) {
3032 if (inst
->src
[i
].file
!= BAD_FILE
) {
3033 fs_reg mov_dst
= retype(dst
, BRW_REGISTER_TYPE_UD
);
3034 fs_reg mov_src
= retype(inst
->src
[i
], BRW_REGISTER_TYPE_UD
);
3035 hbld
.MOV(mov_dst
, mov_src
);
3037 dst
= offset(dst
, hbld
, 1);
3040 if (inst
->dst
.file
== MRF
&& (inst
->dst
.reg
& BRW_MRF_COMPR4
) &&
3041 inst
->exec_size
> 8) {
3042 /* In this case, the payload portion of the LOAD_PAYLOAD isn't
3043 * a straightforward copy. Instead, the result of the
3044 * LOAD_PAYLOAD is treated as interleaved and the first four
3045 * non-header sources are unpacked as:
3056 * This is used for gen <= 5 fb writes.
3058 assert(inst
->exec_size
== 16);
3059 assert(inst
->header_size
+ 4 <= inst
->sources
);
3060 for (uint8_t i
= inst
->header_size
; i
< inst
->header_size
+ 4; i
++) {
3061 if (inst
->src
[i
].file
!= BAD_FILE
) {
3062 if (devinfo
->has_compr4
) {
3063 fs_reg compr4_dst
= retype(dst
, inst
->src
[i
].type
);
3064 compr4_dst
.reg
|= BRW_MRF_COMPR4
;
3065 ibld
.MOV(compr4_dst
, inst
->src
[i
]);
3067 /* Platform doesn't have COMPR4. We have to fake it */
3068 fs_reg mov_dst
= retype(dst
, inst
->src
[i
].type
);
3069 ibld
.half(0).MOV(mov_dst
, half(inst
->src
[i
], 0));
3071 ibld
.half(1).MOV(mov_dst
, half(inst
->src
[i
], 1));
3078 /* The loop above only ever incremented us through the first set
3079 * of 4 registers. However, thanks to the magic of COMPR4, we
3080 * actually wrote to the first 8 registers, so we need to take
3081 * that into account now.
3085 /* The COMPR4 code took care of the first 4 sources. We'll let
3086 * the regular path handle any remaining sources. Yes, we are
3087 * modifying the instruction but we're about to delete it so
3088 * this really doesn't hurt anything.
3090 inst
->header_size
+= 4;
3093 for (uint8_t i
= inst
->header_size
; i
< inst
->sources
; i
++) {
3094 if (inst
->src
[i
].file
!= BAD_FILE
)
3095 ibld
.MOV(retype(dst
, inst
->src
[i
].type
), inst
->src
[i
]);
3096 dst
= offset(dst
, ibld
, 1);
3099 inst
->remove(block
);
3104 invalidate_live_intervals();
3110 fs_visitor::lower_integer_multiplication()
3112 bool progress
= false;
3114 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3115 const fs_builder
ibld(this, block
, inst
);
3117 if (inst
->opcode
== BRW_OPCODE_MUL
) {
3118 if (inst
->dst
.is_accumulator() ||
3119 (inst
->dst
.type
!= BRW_REGISTER_TYPE_D
&&
3120 inst
->dst
.type
!= BRW_REGISTER_TYPE_UD
))
3123 /* Gen8's MUL instruction can do a 32-bit x 32-bit -> 32-bit
3124 * operation directly, but CHV/BXT cannot.
3126 if (devinfo
->gen
>= 8 &&
3127 !devinfo
->is_cherryview
&& !devinfo
->is_broxton
)
3130 if (inst
->src
[1].file
== IMM
&&
3131 inst
->src
[1].fixed_hw_reg
.dw1
.ud
< (1 << 16)) {
3132 /* The MUL instruction isn't commutative. On Gen <= 6, only the low
3133 * 16-bits of src0 are read, and on Gen >= 7 only the low 16-bits of
3136 * If multiplying by an immediate value that fits in 16-bits, do a
3137 * single MUL instruction with that value in the proper location.
3139 if (devinfo
->gen
< 7) {
3140 fs_reg
imm(GRF
, alloc
.allocate(dispatch_width
/ 8),
3142 ibld
.MOV(imm
, inst
->src
[1]);
3143 ibld
.MUL(inst
->dst
, imm
, inst
->src
[0]);
3145 ibld
.MUL(inst
->dst
, inst
->src
[0], inst
->src
[1]);
3148 /* Gen < 8 (and some Gen8+ low-power parts like Cherryview) cannot
3149 * do 32-bit integer multiplication in one instruction, but instead
3150 * must do a sequence (which actually calculates a 64-bit result):
3152 * mul(8) acc0<1>D g3<8,8,1>D g4<8,8,1>D
3153 * mach(8) null g3<8,8,1>D g4<8,8,1>D
3154 * mov(8) g2<1>D acc0<8,8,1>D
3156 * But on Gen > 6, the ability to use second accumulator register
3157 * (acc1) for non-float data types was removed, preventing a simple
3158 * implementation in SIMD16. A 16-channel result can be calculated by
3159 * executing the three instructions twice in SIMD8, once with quarter
3160 * control of 1Q for the first eight channels and again with 2Q for
3161 * the second eight channels.
3163 * Which accumulator register is implicitly accessed (by AccWrEnable
3164 * for instance) is determined by the quarter control. Unfortunately
3165 * Ivybridge (and presumably Baytrail) has a hardware bug in which an
3166 * implicit accumulator access by an instruction with 2Q will access
3167 * acc1 regardless of whether the data type is usable in acc1.
3169 * Specifically, the 2Q mach(8) writes acc1 which does not exist for
3170 * integer data types.
3172 * Since we only want the low 32-bits of the result, we can do two
3173 * 32-bit x 16-bit multiplies (like the mul and mach are doing), and
3174 * adjust the high result and add them (like the mach is doing):
3176 * mul(8) g7<1>D g3<8,8,1>D g4.0<8,8,1>UW
3177 * mul(8) g8<1>D g3<8,8,1>D g4.1<8,8,1>UW
3178 * shl(8) g9<1>D g8<8,8,1>D 16D
3179 * add(8) g2<1>D g7<8,8,1>D g8<8,8,1>D
3181 * We avoid the shl instruction by realizing that we only want to add
3182 * the low 16-bits of the "high" result to the high 16-bits of the
3183 * "low" result and using proper regioning on the add:
3185 * mul(8) g7<1>D g3<8,8,1>D g4.0<16,8,2>UW
3186 * mul(8) g8<1>D g3<8,8,1>D g4.1<16,8,2>UW
3187 * add(8) g7.1<2>UW g7.1<16,8,2>UW g8<16,8,2>UW
3189 * Since it does not use the (single) accumulator register, we can
3190 * schedule multi-component multiplications much better.
3193 if (inst
->conditional_mod
&& inst
->dst
.is_null()) {
3194 inst
->dst
= fs_reg(GRF
, alloc
.allocate(dispatch_width
/ 8),
3197 fs_reg low
= inst
->dst
;
3198 fs_reg
high(GRF
, alloc
.allocate(dispatch_width
/ 8),
3201 if (devinfo
->gen
>= 7) {
3202 fs_reg src1_0_w
= inst
->src
[1];
3203 fs_reg src1_1_w
= inst
->src
[1];
3205 if (inst
->src
[1].file
== IMM
) {
3206 src1_0_w
.fixed_hw_reg
.dw1
.ud
&= 0xffff;
3207 src1_1_w
.fixed_hw_reg
.dw1
.ud
>>= 16;
3209 src1_0_w
.type
= BRW_REGISTER_TYPE_UW
;
3210 if (src1_0_w
.stride
!= 0) {
3211 assert(src1_0_w
.stride
== 1);
3212 src1_0_w
.stride
= 2;
3215 src1_1_w
.type
= BRW_REGISTER_TYPE_UW
;
3216 if (src1_1_w
.stride
!= 0) {
3217 assert(src1_1_w
.stride
== 1);
3218 src1_1_w
.stride
= 2;
3220 src1_1_w
.subreg_offset
+= type_sz(BRW_REGISTER_TYPE_UW
);
3222 ibld
.MUL(low
, inst
->src
[0], src1_0_w
);
3223 ibld
.MUL(high
, inst
->src
[0], src1_1_w
);
3225 fs_reg src0_0_w
= inst
->src
[0];
3226 fs_reg src0_1_w
= inst
->src
[0];
3228 src0_0_w
.type
= BRW_REGISTER_TYPE_UW
;
3229 if (src0_0_w
.stride
!= 0) {
3230 assert(src0_0_w
.stride
== 1);
3231 src0_0_w
.stride
= 2;
3234 src0_1_w
.type
= BRW_REGISTER_TYPE_UW
;
3235 if (src0_1_w
.stride
!= 0) {
3236 assert(src0_1_w
.stride
== 1);
3237 src0_1_w
.stride
= 2;
3239 src0_1_w
.subreg_offset
+= type_sz(BRW_REGISTER_TYPE_UW
);
3241 ibld
.MUL(low
, src0_0_w
, inst
->src
[1]);
3242 ibld
.MUL(high
, src0_1_w
, inst
->src
[1]);
3245 fs_reg dst
= inst
->dst
;
3246 dst
.type
= BRW_REGISTER_TYPE_UW
;
3247 dst
.subreg_offset
= 2;
3250 high
.type
= BRW_REGISTER_TYPE_UW
;
3253 low
.type
= BRW_REGISTER_TYPE_UW
;
3254 low
.subreg_offset
= 2;
3257 ibld
.ADD(dst
, low
, high
);
3259 if (inst
->conditional_mod
) {
3260 fs_reg
null(retype(ibld
.null_reg_f(), inst
->dst
.type
));
3261 set_condmod(inst
->conditional_mod
,
3262 ibld
.MOV(null
, inst
->dst
));
3266 } else if (inst
->opcode
== SHADER_OPCODE_MULH
) {
3267 /* Should have been lowered to 8-wide. */
3268 assert(inst
->exec_size
<= 8);
3269 const fs_reg acc
= retype(brw_acc_reg(inst
->exec_size
),
3271 fs_inst
*mul
= ibld
.MUL(acc
, inst
->src
[0], inst
->src
[1]);
3272 fs_inst
*mach
= ibld
.MACH(inst
->dst
, inst
->src
[0], inst
->src
[1]);
3274 if (devinfo
->gen
>= 8) {
3275 /* Until Gen8, integer multiplies read 32-bits from one source,
3276 * and 16-bits from the other, and relying on the MACH instruction
3277 * to generate the high bits of the result.
3279 * On Gen8, the multiply instruction does a full 32x32-bit
3280 * multiply, but in order to do a 64-bit multiply we can simulate
3281 * the previous behavior and then use a MACH instruction.
3283 * FINISHME: Don't use source modifiers on src1.
3285 assert(mul
->src
[1].type
== BRW_REGISTER_TYPE_D
||
3286 mul
->src
[1].type
== BRW_REGISTER_TYPE_UD
);
3287 mul
->src
[1].type
= (type_is_signed(mul
->src
[1].type
) ?
3288 BRW_REGISTER_TYPE_W
: BRW_REGISTER_TYPE_UW
);
3289 mul
->src
[1].stride
*= 2;
3291 } else if (devinfo
->gen
== 7 && !devinfo
->is_haswell
&&
3292 inst
->force_sechalf
) {
3293 /* Among other things the quarter control bits influence which
3294 * accumulator register is used by the hardware for instructions
3295 * that access the accumulator implicitly (e.g. MACH). A
3296 * second-half instruction would normally map to acc1, which
3297 * doesn't exist on Gen7 and up (the hardware does emulate it for
3298 * floating-point instructions *only* by taking advantage of the
3299 * extra precision of acc0 not normally used for floating point
3302 * HSW and up are careful enough not to try to access an
3303 * accumulator register that doesn't exist, but on earlier Gen7
3304 * hardware we need to make sure that the quarter control bits are
3305 * zero to avoid non-deterministic behaviour and emit an extra MOV
3306 * to get the result masked correctly according to the current
3309 mach
->force_sechalf
= false;
3310 mach
->force_writemask_all
= true;
3311 mach
->dst
= ibld
.vgrf(inst
->dst
.type
);
3312 ibld
.MOV(inst
->dst
, mach
->dst
);
3318 inst
->remove(block
);
3323 invalidate_live_intervals();
3329 setup_color_payload(const fs_builder
&bld
, const brw_wm_prog_key
*key
,
3330 fs_reg
*dst
, fs_reg color
, unsigned components
)
3332 if (key
->clamp_fragment_color
) {
3333 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 4);
3334 assert(color
.type
== BRW_REGISTER_TYPE_F
);
3336 for (unsigned i
= 0; i
< components
; i
++)
3338 bld
.MOV(offset(tmp
, bld
, i
), offset(color
, bld
, i
)));
3343 for (unsigned i
= 0; i
< components
; i
++)
3344 dst
[i
] = offset(color
, bld
, i
);
3348 lower_fb_write_logical_send(const fs_builder
&bld
, fs_inst
*inst
,
3349 const brw_wm_prog_data
*prog_data
,
3350 const brw_wm_prog_key
*key
,
3351 const fs_visitor::thread_payload
&payload
)
3353 assert(inst
->src
[6].file
== IMM
);
3354 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
3355 const fs_reg
&color0
= inst
->src
[0];
3356 const fs_reg
&color1
= inst
->src
[1];
3357 const fs_reg
&src0_alpha
= inst
->src
[2];
3358 const fs_reg
&src_depth
= inst
->src
[3];
3359 const fs_reg
&dst_depth
= inst
->src
[4];
3360 fs_reg sample_mask
= inst
->src
[5];
3361 const unsigned components
= inst
->src
[6].fixed_hw_reg
.dw1
.ud
;
3363 /* We can potentially have a message length of up to 15, so we have to set
3364 * base_mrf to either 0 or 1 in order to fit in m0..m15.
3367 int header_size
= 2, payload_header_size
;
3368 unsigned length
= 0;
3370 /* From the Sandy Bridge PRM, volume 4, page 198:
3372 * "Dispatched Pixel Enables. One bit per pixel indicating
3373 * which pixels were originally enabled when the thread was
3374 * dispatched. This field is only required for the end-of-
3375 * thread message and on all dual-source messages."
3377 if (devinfo
->gen
>= 6 &&
3378 (devinfo
->is_haswell
|| devinfo
->gen
>= 8 || !prog_data
->uses_kill
) &&
3379 color1
.file
== BAD_FILE
&&
3380 key
->nr_color_regions
== 1) {
3384 if (header_size
!= 0) {
3385 assert(header_size
== 2);
3386 /* Allocate 2 registers for a header */
3390 if (payload
.aa_dest_stencil_reg
) {
3391 sources
[length
] = fs_reg(GRF
, bld
.shader
->alloc
.allocate(1));
3392 bld
.group(8, 0).exec_all().annotate("FB write stencil/AA alpha")
3393 .MOV(sources
[length
],
3394 fs_reg(brw_vec8_grf(payload
.aa_dest_stencil_reg
, 0)));
3398 if (prog_data
->uses_omask
) {
3399 sources
[length
] = fs_reg(GRF
, bld
.shader
->alloc
.allocate(1),
3400 BRW_REGISTER_TYPE_UD
);
3402 /* Hand over gl_SampleMask. Only the lower 16 bits of each channel are
3403 * relevant. Since it's unsigned single words one vgrf is always
3404 * 16-wide, but only the lower or higher 8 channels will be used by the
3405 * hardware when doing a SIMD8 write depending on whether we have
3406 * selected the subspans for the first or second half respectively.
3408 assert(sample_mask
.file
!= BAD_FILE
&& type_sz(sample_mask
.type
) == 4);
3409 sample_mask
.type
= BRW_REGISTER_TYPE_UW
;
3410 sample_mask
.stride
*= 2;
3412 bld
.exec_all().annotate("FB write oMask")
3413 .MOV(half(retype(sources
[length
], BRW_REGISTER_TYPE_UW
),
3414 inst
->force_sechalf
),
3419 payload_header_size
= length
;
3421 if (src0_alpha
.file
!= BAD_FILE
) {
3422 /* FIXME: This is being passed at the wrong location in the payload and
3423 * doesn't work when gl_SampleMask and MRTs are used simultaneously.
3424 * It's supposed to be immediately before oMask but there seems to be no
3425 * reasonable way to pass them in the correct order because LOAD_PAYLOAD
3426 * requires header sources to form a contiguous segment at the beginning
3427 * of the message and src0_alpha has per-channel semantics.
3429 setup_color_payload(bld
, key
, &sources
[length
], src0_alpha
, 1);
3433 setup_color_payload(bld
, key
, &sources
[length
], color0
, components
);
3436 if (color1
.file
!= BAD_FILE
) {
3437 setup_color_payload(bld
, key
, &sources
[length
], color1
, components
);
3441 if (src_depth
.file
!= BAD_FILE
) {
3442 sources
[length
] = src_depth
;
3446 if (dst_depth
.file
!= BAD_FILE
) {
3447 sources
[length
] = dst_depth
;
3452 if (devinfo
->gen
>= 7) {
3453 /* Send from the GRF */
3454 fs_reg payload
= fs_reg(GRF
, -1, BRW_REGISTER_TYPE_F
);
3455 load
= bld
.LOAD_PAYLOAD(payload
, sources
, length
, payload_header_size
);
3456 payload
.reg
= bld
.shader
->alloc
.allocate(load
->regs_written
);
3457 load
->dst
= payload
;
3459 inst
->src
[0] = payload
;
3460 inst
->resize_sources(1);
3461 inst
->base_mrf
= -1;
3463 /* Send from the MRF */
3464 load
= bld
.LOAD_PAYLOAD(fs_reg(MRF
, 1, BRW_REGISTER_TYPE_F
),
3465 sources
, length
, payload_header_size
);
3467 /* On pre-SNB, we have to interlace the color values. LOAD_PAYLOAD
3468 * will do this for us if we just give it a COMPR4 destination.
3470 if (devinfo
->gen
< 6 && bld
.dispatch_width() == 16)
3471 load
->dst
.reg
|= BRW_MRF_COMPR4
;
3473 inst
->resize_sources(0);
3477 inst
->opcode
= FS_OPCODE_FB_WRITE
;
3478 inst
->mlen
= load
->regs_written
;
3479 inst
->header_size
= header_size
;
3483 lower_sampler_logical_send_gen4(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3484 const fs_reg
&coordinate
,
3485 const fs_reg
&shadow_c
,
3486 const fs_reg
&lod
, const fs_reg
&lod2
,
3487 const fs_reg
&sampler
,
3488 unsigned coord_components
,
3489 unsigned grad_components
)
3491 const bool has_lod
= (op
== SHADER_OPCODE_TXL
|| op
== FS_OPCODE_TXB
||
3492 op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
);
3493 fs_reg
msg_begin(MRF
, 1, BRW_REGISTER_TYPE_F
);
3494 fs_reg msg_end
= msg_begin
;
3497 msg_end
= offset(msg_end
, bld
.group(8, 0), 1);
3499 for (unsigned i
= 0; i
< coord_components
; i
++)
3500 bld
.MOV(retype(offset(msg_end
, bld
, i
), coordinate
.type
),
3501 offset(coordinate
, bld
, i
));
3503 msg_end
= offset(msg_end
, bld
, coord_components
);
3505 /* Messages other than SAMPLE and RESINFO in SIMD16 and TXD in SIMD8
3506 * require all three components to be present and zero if they are unused.
3508 if (coord_components
> 0 &&
3509 (has_lod
|| shadow_c
.file
!= BAD_FILE
||
3510 (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8))) {
3511 for (unsigned i
= coord_components
; i
< 3; i
++)
3512 bld
.MOV(offset(msg_end
, bld
, i
), fs_reg(0.0f
));
3514 msg_end
= offset(msg_end
, bld
, 3 - coord_components
);
3517 if (op
== SHADER_OPCODE_TXD
) {
3518 /* TXD unsupported in SIMD16 mode. */
3519 assert(bld
.dispatch_width() == 8);
3521 /* the slots for u and v are always present, but r is optional */
3522 if (coord_components
< 2)
3523 msg_end
= offset(msg_end
, bld
, 2 - coord_components
);
3526 * dPdx = dudx, dvdx, drdx
3527 * dPdy = dudy, dvdy, drdy
3529 * 1-arg: Does not exist.
3531 * 2-arg: dudx dvdx dudy dvdy
3532 * dPdx.x dPdx.y dPdy.x dPdy.y
3535 * 3-arg: dudx dvdx drdx dudy dvdy drdy
3536 * dPdx.x dPdx.y dPdx.z dPdy.x dPdy.y dPdy.z
3537 * m5 m6 m7 m8 m9 m10
3539 for (unsigned i
= 0; i
< grad_components
; i
++)
3540 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod
, bld
, i
));
3542 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
3544 for (unsigned i
= 0; i
< grad_components
; i
++)
3545 bld
.MOV(offset(msg_end
, bld
, i
), offset(lod2
, bld
, i
));
3547 msg_end
= offset(msg_end
, bld
, MAX2(grad_components
, 2));
3551 /* Bias/LOD with shadow comparitor is unsupported in SIMD16 -- *Without*
3552 * shadow comparitor (including RESINFO) it's unsupported in SIMD8 mode.
3554 assert(shadow_c
.file
!= BAD_FILE
? bld
.dispatch_width() == 8 :
3555 bld
.dispatch_width() == 16);
3557 const brw_reg_type type
=
3558 (op
== SHADER_OPCODE_TXF
|| op
== SHADER_OPCODE_TXS
?
3559 BRW_REGISTER_TYPE_UD
: BRW_REGISTER_TYPE_F
);
3560 bld
.MOV(retype(msg_end
, type
), lod
);
3561 msg_end
= offset(msg_end
, bld
, 1);
3564 if (shadow_c
.file
!= BAD_FILE
) {
3565 if (op
== SHADER_OPCODE_TEX
&& bld
.dispatch_width() == 8) {
3566 /* There's no plain shadow compare message, so we use shadow
3567 * compare with a bias of 0.0.
3569 bld
.MOV(msg_end
, fs_reg(0.0f
));
3570 msg_end
= offset(msg_end
, bld
, 1);
3573 bld
.MOV(msg_end
, shadow_c
);
3574 msg_end
= offset(msg_end
, bld
, 1);
3578 inst
->src
[0] = reg_undef
;
3579 inst
->src
[1] = sampler
;
3580 inst
->resize_sources(2);
3581 inst
->base_mrf
= msg_begin
.reg
;
3582 inst
->mlen
= msg_end
.reg
- msg_begin
.reg
;
3583 inst
->header_size
= 1;
3587 lower_sampler_logical_send_gen5(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3589 const fs_reg
&shadow_c
,
3590 fs_reg lod
, fs_reg lod2
,
3591 const fs_reg
&sample_index
,
3592 const fs_reg
&sampler
,
3593 const fs_reg
&offset_value
,
3594 unsigned coord_components
,
3595 unsigned grad_components
)
3597 fs_reg
message(MRF
, 2, BRW_REGISTER_TYPE_F
);
3598 fs_reg msg_coords
= message
;
3599 unsigned header_size
= 0;
3601 if (offset_value
.file
!= BAD_FILE
) {
3602 /* The offsets set up by the visitor are in the m1 header, so we can't
3609 for (unsigned i
= 0; i
< coord_components
; i
++) {
3610 bld
.MOV(retype(offset(msg_coords
, bld
, i
), coordinate
.type
), coordinate
);
3611 coordinate
= offset(coordinate
, bld
, 1);
3613 fs_reg msg_end
= offset(msg_coords
, bld
, coord_components
);
3614 fs_reg msg_lod
= offset(msg_coords
, bld
, 4);
3616 if (shadow_c
.file
!= BAD_FILE
) {
3617 fs_reg msg_shadow
= msg_lod
;
3618 bld
.MOV(msg_shadow
, shadow_c
);
3619 msg_lod
= offset(msg_shadow
, bld
, 1);
3624 case SHADER_OPCODE_TXL
:
3626 bld
.MOV(msg_lod
, lod
);
3627 msg_end
= offset(msg_lod
, bld
, 1);
3629 case SHADER_OPCODE_TXD
:
3632 * dPdx = dudx, dvdx, drdx
3633 * dPdy = dudy, dvdy, drdy
3635 * Load up these values:
3636 * - dudx dudy dvdx dvdy drdx drdy
3637 * - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z
3640 for (unsigned i
= 0; i
< grad_components
; i
++) {
3641 bld
.MOV(msg_end
, lod
);
3642 lod
= offset(lod
, bld
, 1);
3643 msg_end
= offset(msg_end
, bld
, 1);
3645 bld
.MOV(msg_end
, lod2
);
3646 lod2
= offset(lod2
, bld
, 1);
3647 msg_end
= offset(msg_end
, bld
, 1);
3650 case SHADER_OPCODE_TXS
:
3651 msg_lod
= retype(msg_end
, BRW_REGISTER_TYPE_UD
);
3652 bld
.MOV(msg_lod
, lod
);
3653 msg_end
= offset(msg_lod
, bld
, 1);
3655 case SHADER_OPCODE_TXF
:
3656 msg_lod
= offset(msg_coords
, bld
, 3);
3657 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), lod
);
3658 msg_end
= offset(msg_lod
, bld
, 1);
3660 case SHADER_OPCODE_TXF_CMS
:
3661 msg_lod
= offset(msg_coords
, bld
, 3);
3663 bld
.MOV(retype(msg_lod
, BRW_REGISTER_TYPE_UD
), fs_reg(0u));
3665 bld
.MOV(retype(offset(msg_lod
, bld
, 1), BRW_REGISTER_TYPE_UD
), sample_index
);
3666 msg_end
= offset(msg_lod
, bld
, 2);
3673 inst
->src
[0] = reg_undef
;
3674 inst
->src
[1] = sampler
;
3675 inst
->resize_sources(2);
3676 inst
->base_mrf
= message
.reg
;
3677 inst
->mlen
= msg_end
.reg
- message
.reg
;
3678 inst
->header_size
= header_size
;
3680 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
3681 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
3685 is_high_sampler(const struct brw_device_info
*devinfo
, const fs_reg
&sampler
)
3687 if (devinfo
->gen
< 8 && !devinfo
->is_haswell
)
3690 return sampler
.file
!= IMM
|| sampler
.fixed_hw_reg
.dw1
.ud
>= 16;
3694 lower_sampler_logical_send_gen7(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3696 const fs_reg
&shadow_c
,
3697 fs_reg lod
, fs_reg lod2
,
3698 const fs_reg
&sample_index
,
3699 const fs_reg
&mcs
, const fs_reg
&sampler
,
3700 fs_reg offset_value
,
3701 unsigned coord_components
,
3702 unsigned grad_components
)
3704 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
3705 int reg_width
= bld
.dispatch_width() / 8;
3706 unsigned header_size
= 0, length
= 0;
3707 fs_reg sources
[MAX_SAMPLER_MESSAGE_SIZE
];
3708 for (unsigned i
= 0; i
< ARRAY_SIZE(sources
); i
++)
3709 sources
[i
] = bld
.vgrf(BRW_REGISTER_TYPE_F
);
3711 if (op
== SHADER_OPCODE_TG4
|| op
== SHADER_OPCODE_TG4_OFFSET
||
3712 offset_value
.file
!= BAD_FILE
||
3713 is_high_sampler(devinfo
, sampler
)) {
3714 /* For general texture offsets (no txf workaround), we need a header to
3715 * put them in. Note that we're only reserving space for it in the
3716 * message payload as it will be initialized implicitly by the
3719 * TG4 needs to place its channel select in the header, for interaction
3720 * with ARB_texture_swizzle. The sampler index is only 4-bits, so for
3721 * larger sampler numbers we need to offset the Sampler State Pointer in
3725 sources
[0] = fs_reg();
3729 if (shadow_c
.file
!= BAD_FILE
) {
3730 bld
.MOV(sources
[length
], shadow_c
);
3734 bool coordinate_done
= false;
3736 /* The sampler can only meaningfully compute LOD for fragment shader
3737 * messages. For all other stages, we change the opcode to TXL and
3738 * hardcode the LOD to 0.
3740 if (bld
.shader
->stage
!= MESA_SHADER_FRAGMENT
&&
3741 op
== SHADER_OPCODE_TEX
) {
3742 op
= SHADER_OPCODE_TXL
;
3746 /* Set up the LOD info */
3749 case SHADER_OPCODE_TXL
:
3750 bld
.MOV(sources
[length
], lod
);
3753 case SHADER_OPCODE_TXD
:
3754 /* TXD should have been lowered in SIMD16 mode. */
3755 assert(bld
.dispatch_width() == 8);
3757 /* Load dPdx and the coordinate together:
3758 * [hdr], [ref], x, dPdx.x, dPdy.x, y, dPdx.y, dPdy.y, z, dPdx.z, dPdy.z
3760 for (unsigned i
= 0; i
< coord_components
; i
++) {
3761 bld
.MOV(sources
[length
], coordinate
);
3762 coordinate
= offset(coordinate
, bld
, 1);
3765 /* For cube map array, the coordinate is (u,v,r,ai) but there are
3766 * only derivatives for (u, v, r).
3768 if (i
< grad_components
) {
3769 bld
.MOV(sources
[length
], lod
);
3770 lod
= offset(lod
, bld
, 1);
3773 bld
.MOV(sources
[length
], lod2
);
3774 lod2
= offset(lod2
, bld
, 1);
3779 coordinate_done
= true;
3781 case SHADER_OPCODE_TXS
:
3782 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), lod
);
3785 case SHADER_OPCODE_TXF
:
3786 /* Unfortunately, the parameters for LD are intermixed: u, lod, v, r.
3787 * On Gen9 they are u, v, lod, r
3789 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
3790 coordinate
= offset(coordinate
, bld
, 1);
3793 if (devinfo
->gen
>= 9) {
3794 if (coord_components
>= 2) {
3795 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
3796 coordinate
= offset(coordinate
, bld
, 1);
3801 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), lod
);
3804 for (unsigned i
= devinfo
->gen
>= 9 ? 2 : 1; i
< coord_components
; i
++) {
3805 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
3806 coordinate
= offset(coordinate
, bld
, 1);
3810 coordinate_done
= true;
3812 case SHADER_OPCODE_TXF_CMS
:
3813 case SHADER_OPCODE_TXF_UMS
:
3814 case SHADER_OPCODE_TXF_MCS
:
3815 if (op
== SHADER_OPCODE_TXF_UMS
|| op
== SHADER_OPCODE_TXF_CMS
) {
3816 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), sample_index
);
3820 if (op
== SHADER_OPCODE_TXF_CMS
) {
3821 /* Data from the multisample control surface. */
3822 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_UD
), mcs
);
3826 /* There is no offsetting for this message; just copy in the integer
3827 * texture coordinates.
3829 for (unsigned i
= 0; i
< coord_components
; i
++) {
3830 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), coordinate
);
3831 coordinate
= offset(coordinate
, bld
, 1);
3835 coordinate_done
= true;
3837 case SHADER_OPCODE_TG4_OFFSET
:
3838 /* gather4_po_c should have been lowered in SIMD16 mode. */
3839 assert(bld
.dispatch_width() == 8 || shadow_c
.file
== BAD_FILE
);
3841 /* More crazy intermixing */
3842 for (unsigned i
= 0; i
< 2; i
++) { /* u, v */
3843 bld
.MOV(sources
[length
], coordinate
);
3844 coordinate
= offset(coordinate
, bld
, 1);
3848 for (unsigned i
= 0; i
< 2; i
++) { /* offu, offv */
3849 bld
.MOV(retype(sources
[length
], BRW_REGISTER_TYPE_D
), offset_value
);
3850 offset_value
= offset(offset_value
, bld
, 1);
3854 if (coord_components
== 3) { /* r if present */
3855 bld
.MOV(sources
[length
], coordinate
);
3856 coordinate
= offset(coordinate
, bld
, 1);
3860 coordinate_done
= true;
3866 /* Set up the coordinate (except for cases where it was done above) */
3867 if (!coordinate_done
) {
3868 for (unsigned i
= 0; i
< coord_components
; i
++) {
3869 bld
.MOV(sources
[length
], coordinate
);
3870 coordinate
= offset(coordinate
, bld
, 1);
3877 mlen
= length
* reg_width
- header_size
;
3879 mlen
= length
* reg_width
;
3881 const fs_reg src_payload
= fs_reg(GRF
, bld
.shader
->alloc
.allocate(mlen
),
3882 BRW_REGISTER_TYPE_F
);
3883 bld
.LOAD_PAYLOAD(src_payload
, sources
, length
, header_size
);
3885 /* Generate the SEND. */
3887 inst
->src
[0] = src_payload
;
3888 inst
->src
[1] = sampler
;
3889 inst
->resize_sources(2);
3890 inst
->base_mrf
= -1;
3892 inst
->header_size
= header_size
;
3894 /* Message length > MAX_SAMPLER_MESSAGE_SIZE disallowed by hardware. */
3895 assert(inst
->mlen
<= MAX_SAMPLER_MESSAGE_SIZE
);
3899 lower_sampler_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
)
3901 const brw_device_info
*devinfo
= bld
.shader
->devinfo
;
3902 const fs_reg
&coordinate
= inst
->src
[0];
3903 const fs_reg
&shadow_c
= inst
->src
[1];
3904 const fs_reg
&lod
= inst
->src
[2];
3905 const fs_reg
&lod2
= inst
->src
[3];
3906 const fs_reg
&sample_index
= inst
->src
[4];
3907 const fs_reg
&mcs
= inst
->src
[5];
3908 const fs_reg
&sampler
= inst
->src
[6];
3909 const fs_reg
&offset_value
= inst
->src
[7];
3910 assert(inst
->src
[8].file
== IMM
&& inst
->src
[9].file
== IMM
);
3911 const unsigned coord_components
= inst
->src
[8].fixed_hw_reg
.dw1
.ud
;
3912 const unsigned grad_components
= inst
->src
[9].fixed_hw_reg
.dw1
.ud
;
3914 if (devinfo
->gen
>= 7) {
3915 lower_sampler_logical_send_gen7(bld
, inst
, op
, coordinate
,
3916 shadow_c
, lod
, lod2
, sample_index
,
3917 mcs
, sampler
, offset_value
,
3918 coord_components
, grad_components
);
3919 } else if (devinfo
->gen
>= 5) {
3920 lower_sampler_logical_send_gen5(bld
, inst
, op
, coordinate
,
3921 shadow_c
, lod
, lod2
, sample_index
,
3922 sampler
, offset_value
,
3923 coord_components
, grad_components
);
3925 lower_sampler_logical_send_gen4(bld
, inst
, op
, coordinate
,
3926 shadow_c
, lod
, lod2
, sampler
,
3927 coord_components
, grad_components
);
3932 * Initialize the header present in some typed and untyped surface
3936 emit_surface_header(const fs_builder
&bld
, const fs_reg
&sample_mask
)
3938 fs_builder ubld
= bld
.exec_all().group(8, 0);
3939 const fs_reg dst
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
3940 ubld
.MOV(dst
, fs_reg(0));
3941 ubld
.MOV(component(dst
, 7), sample_mask
);
3946 lower_surface_logical_send(const fs_builder
&bld
, fs_inst
*inst
, opcode op
,
3947 const fs_reg
&sample_mask
)
3949 /* Get the logical send arguments. */
3950 const fs_reg
&addr
= inst
->src
[0];
3951 const fs_reg
&src
= inst
->src
[1];
3952 const fs_reg
&surface
= inst
->src
[2];
3953 const UNUSED fs_reg
&dims
= inst
->src
[3];
3954 const fs_reg
&arg
= inst
->src
[4];
3956 /* Calculate the total number of components of the payload. */
3957 const unsigned addr_sz
= inst
->components_read(0);
3958 const unsigned src_sz
= inst
->components_read(1);
3959 const unsigned header_sz
= (sample_mask
.file
== BAD_FILE
? 0 : 1);
3960 const unsigned sz
= header_sz
+ addr_sz
+ src_sz
;
3962 /* Allocate space for the payload. */
3963 fs_reg
*const components
= new fs_reg
[sz
];
3964 const fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, sz
);
3967 /* Construct the payload. */
3969 components
[n
++] = emit_surface_header(bld
, sample_mask
);
3971 for (unsigned i
= 0; i
< addr_sz
; i
++)
3972 components
[n
++] = offset(addr
, bld
, i
);
3974 for (unsigned i
= 0; i
< src_sz
; i
++)
3975 components
[n
++] = offset(src
, bld
, i
);
3977 bld
.LOAD_PAYLOAD(payload
, components
, sz
, header_sz
);
3979 /* Update the original instruction. */
3981 inst
->mlen
= header_sz
+ (addr_sz
+ src_sz
) * inst
->exec_size
/ 8;
3982 inst
->header_size
= header_sz
;
3984 inst
->src
[0] = payload
;
3985 inst
->src
[1] = surface
;
3987 inst
->resize_sources(3);
3989 delete[] components
;
3993 fs_visitor::lower_logical_sends()
3995 bool progress
= false;
3997 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
3998 const fs_builder
ibld(this, block
, inst
);
4000 switch (inst
->opcode
) {
4001 case FS_OPCODE_FB_WRITE_LOGICAL
:
4002 assert(stage
== MESA_SHADER_FRAGMENT
);
4003 lower_fb_write_logical_send(ibld
, inst
,
4004 (const brw_wm_prog_data
*)prog_data
,
4005 (const brw_wm_prog_key
*)key
,
4009 case SHADER_OPCODE_TEX_LOGICAL
:
4010 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TEX
);
4013 case SHADER_OPCODE_TXD_LOGICAL
:
4014 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXD
);
4017 case SHADER_OPCODE_TXF_LOGICAL
:
4018 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF
);
4021 case SHADER_OPCODE_TXL_LOGICAL
:
4022 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXL
);
4025 case SHADER_OPCODE_TXS_LOGICAL
:
4026 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXS
);
4029 case FS_OPCODE_TXB_LOGICAL
:
4030 lower_sampler_logical_send(ibld
, inst
, FS_OPCODE_TXB
);
4033 case SHADER_OPCODE_TXF_CMS_LOGICAL
:
4034 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_CMS
);
4037 case SHADER_OPCODE_TXF_UMS_LOGICAL
:
4038 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_UMS
);
4041 case SHADER_OPCODE_TXF_MCS_LOGICAL
:
4042 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TXF_MCS
);
4045 case SHADER_OPCODE_LOD_LOGICAL
:
4046 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_LOD
);
4049 case SHADER_OPCODE_TG4_LOGICAL
:
4050 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4
);
4053 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
:
4054 lower_sampler_logical_send(ibld
, inst
, SHADER_OPCODE_TG4_OFFSET
);
4057 case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL
:
4058 lower_surface_logical_send(ibld
, inst
,
4059 SHADER_OPCODE_UNTYPED_SURFACE_READ
,
4063 case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL
:
4064 lower_surface_logical_send(ibld
, inst
,
4065 SHADER_OPCODE_UNTYPED_SURFACE_WRITE
,
4066 ibld
.sample_mask_reg());
4069 case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL
:
4070 lower_surface_logical_send(ibld
, inst
,
4071 SHADER_OPCODE_UNTYPED_ATOMIC
,
4072 ibld
.sample_mask_reg());
4075 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
4076 lower_surface_logical_send(ibld
, inst
,
4077 SHADER_OPCODE_TYPED_SURFACE_READ
,
4081 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
4082 lower_surface_logical_send(ibld
, inst
,
4083 SHADER_OPCODE_TYPED_SURFACE_WRITE
,
4084 ibld
.sample_mask_reg());
4087 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
4088 lower_surface_logical_send(ibld
, inst
,
4089 SHADER_OPCODE_TYPED_ATOMIC
,
4090 ibld
.sample_mask_reg());
4101 invalidate_live_intervals();
4107 * Get the closest native SIMD width supported by the hardware for instruction
4108 * \p inst. The instruction will be left untouched by
4109 * fs_visitor::lower_simd_width() if the returned value is equal to the
4110 * original execution size.
4113 get_lowered_simd_width(const struct brw_device_info
*devinfo
,
4114 const fs_inst
*inst
)
4116 switch (inst
->opcode
) {
4117 case BRW_OPCODE_MOV
:
4118 case BRW_OPCODE_SEL
:
4119 case BRW_OPCODE_NOT
:
4120 case BRW_OPCODE_AND
:
4122 case BRW_OPCODE_XOR
:
4123 case BRW_OPCODE_SHR
:
4124 case BRW_OPCODE_SHL
:
4125 case BRW_OPCODE_ASR
:
4126 case BRW_OPCODE_CMP
:
4127 case BRW_OPCODE_CMPN
:
4128 case BRW_OPCODE_CSEL
:
4129 case BRW_OPCODE_F32TO16
:
4130 case BRW_OPCODE_F16TO32
:
4131 case BRW_OPCODE_BFREV
:
4132 case BRW_OPCODE_BFE
:
4133 case BRW_OPCODE_BFI1
:
4134 case BRW_OPCODE_BFI2
:
4135 case BRW_OPCODE_ADD
:
4136 case BRW_OPCODE_MUL
:
4137 case BRW_OPCODE_AVG
:
4138 case BRW_OPCODE_FRC
:
4139 case BRW_OPCODE_RNDU
:
4140 case BRW_OPCODE_RNDD
:
4141 case BRW_OPCODE_RNDE
:
4142 case BRW_OPCODE_RNDZ
:
4143 case BRW_OPCODE_LZD
:
4144 case BRW_OPCODE_FBH
:
4145 case BRW_OPCODE_FBL
:
4146 case BRW_OPCODE_CBIT
:
4147 case BRW_OPCODE_SAD2
:
4148 case BRW_OPCODE_MAD
:
4149 case BRW_OPCODE_LRP
:
4150 case SHADER_OPCODE_RCP
:
4151 case SHADER_OPCODE_RSQ
:
4152 case SHADER_OPCODE_SQRT
:
4153 case SHADER_OPCODE_EXP2
:
4154 case SHADER_OPCODE_LOG2
:
4155 case SHADER_OPCODE_POW
:
4156 case SHADER_OPCODE_INT_QUOTIENT
:
4157 case SHADER_OPCODE_INT_REMAINDER
:
4158 case SHADER_OPCODE_SIN
:
4159 case SHADER_OPCODE_COS
: {
4160 /* According to the PRMs:
4161 * "A. In Direct Addressing mode, a source cannot span more than 2
4162 * adjacent GRF registers.
4163 * B. A destination cannot span more than 2 adjacent GRF registers."
4165 * Look for the source or destination with the largest register region
4166 * which is the one that is going to limit the overal execution size of
4167 * the instruction due to this rule.
4169 unsigned reg_count
= inst
->regs_written
;
4171 for (unsigned i
= 0; i
< inst
->sources
; i
++)
4172 reg_count
= MAX2(reg_count
, (unsigned)inst
->regs_read(i
));
4174 /* Calculate the maximum execution size of the instruction based on the
4175 * factor by which it goes over the hardware limit of 2 GRFs.
4177 return inst
->exec_size
/ DIV_ROUND_UP(reg_count
, 2);
4179 case SHADER_OPCODE_MULH
:
4180 /* MULH is lowered to the MUL/MACH sequence using the accumulator, which
4181 * is 8-wide on Gen7+.
4183 return (devinfo
->gen
>= 7 ? 8 : inst
->exec_size
);
4185 case FS_OPCODE_FB_WRITE_LOGICAL
:
4186 /* Gen6 doesn't support SIMD16 depth writes but we cannot handle them
4189 assert(devinfo
->gen
!= 6 || inst
->src
[3].file
== BAD_FILE
||
4190 inst
->exec_size
== 8);
4191 /* Dual-source FB writes are unsupported in SIMD16 mode. */
4192 return (inst
->src
[1].file
!= BAD_FILE
? 8 : inst
->exec_size
);
4194 case SHADER_OPCODE_TXD_LOGICAL
:
4195 /* TXD is unsupported in SIMD16 mode. */
4198 case SHADER_OPCODE_TG4_OFFSET_LOGICAL
: {
4199 /* gather4_po_c is unsupported in SIMD16 mode. */
4200 const fs_reg
&shadow_c
= inst
->src
[1];
4201 return (shadow_c
.file
!= BAD_FILE
? 8 : inst
->exec_size
);
4203 case SHADER_OPCODE_TXL_LOGICAL
:
4204 case FS_OPCODE_TXB_LOGICAL
: {
4205 /* Gen4 doesn't have SIMD8 non-shadow-compare bias/LOD instructions, and
4206 * Gen4-6 can't support TXL and TXB with shadow comparison in SIMD16
4207 * mode because the message exceeds the maximum length of 11.
4209 const fs_reg
&shadow_c
= inst
->src
[1];
4210 if (devinfo
->gen
== 4 && shadow_c
.file
== BAD_FILE
)
4212 else if (devinfo
->gen
< 7 && shadow_c
.file
!= BAD_FILE
)
4215 return inst
->exec_size
;
4217 case SHADER_OPCODE_TXF_LOGICAL
:
4218 case SHADER_OPCODE_TXS_LOGICAL
:
4219 /* Gen4 doesn't have SIMD8 variants for the RESINFO and LD-with-LOD
4220 * messages. Use SIMD16 instead.
4222 if (devinfo
->gen
== 4)
4225 return inst
->exec_size
;
4227 case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL
:
4228 case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL
:
4229 case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL
:
4233 return inst
->exec_size
;
4238 * The \p rows array of registers represents a \p num_rows by \p num_columns
4239 * matrix in row-major order, write it in column-major order into the register
4240 * passed as destination. \p stride gives the separation between matrix
4241 * elements in the input in fs_builder::dispatch_width() units.
4244 emit_transpose(const fs_builder
&bld
,
4245 const fs_reg
&dst
, const fs_reg
*rows
,
4246 unsigned num_rows
, unsigned num_columns
, unsigned stride
)
4248 fs_reg
*const components
= new fs_reg
[num_rows
* num_columns
];
4250 for (unsigned i
= 0; i
< num_columns
; ++i
) {
4251 for (unsigned j
= 0; j
< num_rows
; ++j
)
4252 components
[num_rows
* i
+ j
] = offset(rows
[j
], bld
, stride
* i
);
4255 bld
.LOAD_PAYLOAD(dst
, components
, num_rows
* num_columns
, 0);
4257 delete[] components
;
4261 fs_visitor::lower_simd_width()
4263 bool progress
= false;
4265 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
4266 const unsigned lower_width
= get_lowered_simd_width(devinfo
, inst
);
4268 if (lower_width
!= inst
->exec_size
) {
4269 /* Builder matching the original instruction. We may also need to
4270 * emit an instruction of width larger than the original, set the
4271 * execution size of the builder to the highest of both for now so
4272 * we're sure that both cases can be handled.
4274 const fs_builder ibld
= bld
.at(block
, inst
)
4275 .exec_all(inst
->force_writemask_all
)
4276 .group(MAX2(inst
->exec_size
, lower_width
),
4277 inst
->force_sechalf
);
4279 /* Split the copies in chunks of the execution width of either the
4280 * original or the lowered instruction, whichever is lower.
4282 const unsigned copy_width
= MIN2(lower_width
, inst
->exec_size
);
4283 const unsigned n
= inst
->exec_size
/ copy_width
;
4284 const unsigned dst_size
= inst
->regs_written
* REG_SIZE
/
4285 inst
->dst
.component_size(inst
->exec_size
);
4288 assert(n
> 0 && n
<= ARRAY_SIZE(dsts
) &&
4289 !inst
->writes_accumulator
&& !inst
->mlen
);
4291 for (unsigned i
= 0; i
< n
; i
++) {
4292 /* Emit a copy of the original instruction with the lowered width.
4293 * If the EOT flag was set throw it away except for the last
4294 * instruction to avoid killing the thread prematurely.
4296 fs_inst split_inst
= *inst
;
4297 split_inst
.exec_size
= lower_width
;
4298 split_inst
.eot
= inst
->eot
&& i
== n
- 1;
4300 /* Select the correct channel enables for the i-th group, then
4301 * transform the sources and destination and emit the lowered
4304 const fs_builder lbld
= ibld
.group(lower_width
, i
);
4306 for (unsigned j
= 0; j
< inst
->sources
; j
++) {
4307 if (inst
->src
[j
].file
!= BAD_FILE
&&
4308 !is_uniform(inst
->src
[j
])) {
4309 /* Get the i-th copy_width-wide chunk of the source. */
4310 const fs_reg src
= horiz_offset(inst
->src
[j
], copy_width
* i
);
4311 const unsigned src_size
= inst
->components_read(j
);
4313 /* Use a trivial transposition to copy one every n
4314 * copy_width-wide components of the register into a
4315 * temporary passed as source to the lowered instruction.
4317 split_inst
.src
[j
] = lbld
.vgrf(inst
->src
[j
].type
, src_size
);
4318 emit_transpose(lbld
.group(copy_width
, 0),
4319 split_inst
.src
[j
], &src
, 1, src_size
, n
);
4323 if (inst
->regs_written
) {
4324 /* Allocate enough space to hold the result of the lowered
4325 * instruction and fix up the number of registers written.
4327 split_inst
.dst
= dsts
[i
] =
4328 lbld
.vgrf(inst
->dst
.type
, dst_size
);
4329 split_inst
.regs_written
=
4330 DIV_ROUND_UP(inst
->regs_written
* lower_width
,
4334 lbld
.emit(split_inst
);
4337 if (inst
->regs_written
) {
4338 /* Distance between useful channels in the temporaries, skipping
4339 * garbage if the lowered instruction is wider than the original.
4341 const unsigned m
= lower_width
/ copy_width
;
4343 /* Interleave the components of the result from the lowered
4344 * instructions. We need to set exec_all() when copying more than
4345 * one half per component, because LOAD_PAYLOAD (in terms of which
4346 * emit_transpose is implemented) can only use the same channel
4347 * enable signals for all of its non-header sources.
4349 emit_transpose(ibld
.exec_all(inst
->exec_size
> copy_width
)
4350 .group(copy_width
, 0),
4351 inst
->dst
, dsts
, n
, dst_size
, m
);
4354 inst
->remove(block
);
4360 invalidate_live_intervals();
4366 fs_visitor::dump_instructions()
4368 dump_instructions(NULL
);
4372 fs_visitor::dump_instructions(const char *name
)
4374 FILE *file
= stderr
;
4375 if (name
&& geteuid() != 0) {
4376 file
= fopen(name
, "w");
4382 calculate_register_pressure();
4383 int ip
= 0, max_pressure
= 0;
4384 foreach_block_and_inst(block
, backend_instruction
, inst
, cfg
) {
4385 max_pressure
= MAX2(max_pressure
, regs_live_at_ip
[ip
]);
4386 fprintf(file
, "{%3d} %4d: ", regs_live_at_ip
[ip
], ip
);
4387 dump_instruction(inst
, file
);
4390 fprintf(file
, "Maximum %3d registers live at once.\n", max_pressure
);
4393 foreach_in_list(backend_instruction
, inst
, &instructions
) {
4394 fprintf(file
, "%4d: ", ip
++);
4395 dump_instruction(inst
, file
);
4399 if (file
!= stderr
) {
4405 fs_visitor::dump_instruction(backend_instruction
*be_inst
)
4407 dump_instruction(be_inst
, stderr
);
4411 fs_visitor::dump_instruction(backend_instruction
*be_inst
, FILE *file
)
4413 fs_inst
*inst
= (fs_inst
*)be_inst
;
4415 if (inst
->predicate
) {
4416 fprintf(file
, "(%cf0.%d) ",
4417 inst
->predicate_inverse
? '-' : '+',
4421 fprintf(file
, "%s", brw_instruction_name(inst
->opcode
));
4423 fprintf(file
, ".sat");
4424 if (inst
->conditional_mod
) {
4425 fprintf(file
, "%s", conditional_modifier
[inst
->conditional_mod
]);
4426 if (!inst
->predicate
&&
4427 (devinfo
->gen
< 5 || (inst
->opcode
!= BRW_OPCODE_SEL
&&
4428 inst
->opcode
!= BRW_OPCODE_IF
&&
4429 inst
->opcode
!= BRW_OPCODE_WHILE
))) {
4430 fprintf(file
, ".f0.%d", inst
->flag_subreg
);
4433 fprintf(file
, "(%d) ", inst
->exec_size
);
4436 fprintf(file
, "(mlen: %d) ", inst
->mlen
);
4439 switch (inst
->dst
.file
) {
4441 fprintf(file
, "vgrf%d", inst
->dst
.reg
);
4442 if (alloc
.sizes
[inst
->dst
.reg
] != inst
->regs_written
||
4443 inst
->dst
.subreg_offset
)
4444 fprintf(file
, "+%d.%d",
4445 inst
->dst
.reg_offset
, inst
->dst
.subreg_offset
);
4448 fprintf(file
, "m%d", inst
->dst
.reg
);
4451 fprintf(file
, "(null)");
4454 fprintf(file
, "***u%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
4457 fprintf(file
, "***attr%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
4460 if (inst
->dst
.fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
4461 switch (inst
->dst
.fixed_hw_reg
.nr
) {
4463 fprintf(file
, "null");
4465 case BRW_ARF_ADDRESS
:
4466 fprintf(file
, "a0.%d", inst
->dst
.fixed_hw_reg
.subnr
);
4468 case BRW_ARF_ACCUMULATOR
:
4469 fprintf(file
, "acc%d", inst
->dst
.fixed_hw_reg
.subnr
);
4472 fprintf(file
, "f%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
4473 inst
->dst
.fixed_hw_reg
.subnr
);
4476 fprintf(file
, "arf%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
4477 inst
->dst
.fixed_hw_reg
.subnr
);
4481 fprintf(file
, "hw_reg%d", inst
->dst
.fixed_hw_reg
.nr
);
4483 if (inst
->dst
.fixed_hw_reg
.subnr
)
4484 fprintf(file
, "+%d", inst
->dst
.fixed_hw_reg
.subnr
);
4487 fprintf(file
, "???");
4490 fprintf(file
, ":%s, ", brw_reg_type_letters(inst
->dst
.type
));
4492 for (int i
= 0; i
< inst
->sources
; i
++) {
4493 if (inst
->src
[i
].negate
)
4495 if (inst
->src
[i
].abs
)
4497 switch (inst
->src
[i
].file
) {
4499 fprintf(file
, "vgrf%d", inst
->src
[i
].reg
);
4500 if (alloc
.sizes
[inst
->src
[i
].reg
] != (unsigned)inst
->regs_read(i
) ||
4501 inst
->src
[i
].subreg_offset
)
4502 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
4503 inst
->src
[i
].subreg_offset
);
4506 fprintf(file
, "***m%d***", inst
->src
[i
].reg
);
4509 fprintf(file
, "attr%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
4512 fprintf(file
, "u%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
4513 if (inst
->src
[i
].reladdr
) {
4514 fprintf(file
, "+reladdr");
4515 } else if (inst
->src
[i
].subreg_offset
) {
4516 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
4517 inst
->src
[i
].subreg_offset
);
4521 fprintf(file
, "(null)");
4524 switch (inst
->src
[i
].type
) {
4525 case BRW_REGISTER_TYPE_F
:
4526 fprintf(file
, "%ff", inst
->src
[i
].fixed_hw_reg
.dw1
.f
);
4528 case BRW_REGISTER_TYPE_W
:
4529 case BRW_REGISTER_TYPE_D
:
4530 fprintf(file
, "%dd", inst
->src
[i
].fixed_hw_reg
.dw1
.d
);
4532 case BRW_REGISTER_TYPE_UW
:
4533 case BRW_REGISTER_TYPE_UD
:
4534 fprintf(file
, "%uu", inst
->src
[i
].fixed_hw_reg
.dw1
.ud
);
4536 case BRW_REGISTER_TYPE_VF
:
4537 fprintf(file
, "[%-gF, %-gF, %-gF, %-gF]",
4538 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 0) & 0xff),
4539 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 8) & 0xff),
4540 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 16) & 0xff),
4541 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 24) & 0xff));
4544 fprintf(file
, "???");
4549 if (inst
->src
[i
].fixed_hw_reg
.negate
)
4551 if (inst
->src
[i
].fixed_hw_reg
.abs
)
4553 if (inst
->src
[i
].fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
4554 switch (inst
->src
[i
].fixed_hw_reg
.nr
) {
4556 fprintf(file
, "null");
4558 case BRW_ARF_ADDRESS
:
4559 fprintf(file
, "a0.%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
4561 case BRW_ARF_ACCUMULATOR
:
4562 fprintf(file
, "acc%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
4565 fprintf(file
, "f%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
4566 inst
->src
[i
].fixed_hw_reg
.subnr
);
4569 fprintf(file
, "arf%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
4570 inst
->src
[i
].fixed_hw_reg
.subnr
);
4574 fprintf(file
, "hw_reg%d", inst
->src
[i
].fixed_hw_reg
.nr
);
4576 if (inst
->src
[i
].fixed_hw_reg
.subnr
)
4577 fprintf(file
, "+%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
4578 if (inst
->src
[i
].fixed_hw_reg
.abs
)
4582 fprintf(file
, "???");
4585 if (inst
->src
[i
].abs
)
4588 if (inst
->src
[i
].file
!= IMM
) {
4589 fprintf(file
, ":%s", brw_reg_type_letters(inst
->src
[i
].type
));
4592 if (i
< inst
->sources
- 1 && inst
->src
[i
+ 1].file
!= BAD_FILE
)
4593 fprintf(file
, ", ");
4598 if (dispatch_width
== 16 && inst
->exec_size
== 8) {
4599 if (inst
->force_sechalf
)
4600 fprintf(file
, "2ndhalf ");
4602 fprintf(file
, "1sthalf ");
4605 fprintf(file
, "\n");
4609 * Possibly returns an instruction that set up @param reg.
4611 * Sometimes we want to take the result of some expression/variable
4612 * dereference tree and rewrite the instruction generating the result
4613 * of the tree. When processing the tree, we know that the
4614 * instructions generated are all writing temporaries that are dead
4615 * outside of this tree. So, if we have some instructions that write
4616 * a temporary, we're free to point that temp write somewhere else.
4618 * Note that this doesn't guarantee that the instruction generated
4619 * only reg -- it might be the size=4 destination of a texture instruction.
4622 fs_visitor::get_instruction_generating_reg(fs_inst
*start
,
4627 end
->is_partial_write() ||
4629 !reg
.equals(end
->dst
)) {
4637 fs_visitor::setup_payload_gen6()
4640 (prog
->InputsRead
& (1 << VARYING_SLOT_POS
)) != 0;
4641 unsigned barycentric_interp_modes
=
4642 (stage
== MESA_SHADER_FRAGMENT
) ?
4643 ((brw_wm_prog_data
*) this->prog_data
)->barycentric_interp_modes
: 0;
4645 assert(devinfo
->gen
>= 6);
4647 /* R0-1: masks, pixel X/Y coordinates. */
4648 payload
.num_regs
= 2;
4649 /* R2: only for 32-pixel dispatch.*/
4651 /* R3-26: barycentric interpolation coordinates. These appear in the
4652 * same order that they appear in the brw_wm_barycentric_interp_mode
4653 * enum. Each set of coordinates occupies 2 registers if dispatch width
4654 * == 8 and 4 registers if dispatch width == 16. Coordinates only
4655 * appear if they were enabled using the "Barycentric Interpolation
4656 * Mode" bits in WM_STATE.
4658 for (int i
= 0; i
< BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT
; ++i
) {
4659 if (barycentric_interp_modes
& (1 << i
)) {
4660 payload
.barycentric_coord_reg
[i
] = payload
.num_regs
;
4661 payload
.num_regs
+= 2;
4662 if (dispatch_width
== 16) {
4663 payload
.num_regs
+= 2;
4668 /* R27: interpolated depth if uses source depth */
4670 payload
.source_depth_reg
= payload
.num_regs
;
4672 if (dispatch_width
== 16) {
4673 /* R28: interpolated depth if not SIMD8. */
4677 /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W. */
4679 payload
.source_w_reg
= payload
.num_regs
;
4681 if (dispatch_width
== 16) {
4682 /* R30: interpolated W if not SIMD8. */
4687 if (stage
== MESA_SHADER_FRAGMENT
) {
4688 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
4689 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
4690 prog_data
->uses_pos_offset
= key
->compute_pos_offset
;
4691 /* R31: MSAA position offsets. */
4692 if (prog_data
->uses_pos_offset
) {
4693 payload
.sample_pos_reg
= payload
.num_regs
;
4698 /* R32: MSAA input coverage mask */
4699 if (prog
->SystemValuesRead
& SYSTEM_BIT_SAMPLE_MASK_IN
) {
4700 assert(devinfo
->gen
>= 7);
4701 payload
.sample_mask_in_reg
= payload
.num_regs
;
4703 if (dispatch_width
== 16) {
4704 /* R33: input coverage mask if not SIMD8. */
4709 /* R34-: bary for 32-pixel. */
4710 /* R58-59: interp W for 32-pixel. */
4712 if (prog
->OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
4713 source_depth_to_render_target
= true;
4718 fs_visitor::setup_vs_payload()
4720 /* R0: thread header, R1: urb handles */
4721 payload
.num_regs
= 2;
4725 fs_visitor::setup_cs_payload()
4727 assert(devinfo
->gen
>= 7);
4729 payload
.num_regs
= 1;
4733 fs_visitor::assign_binding_table_offsets()
4735 assert(stage
== MESA_SHADER_FRAGMENT
);
4736 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
4737 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
4738 uint32_t next_binding_table_offset
= 0;
4740 /* If there are no color regions, we still perform an FB write to a null
4741 * renderbuffer, which we place at surface index 0.
4743 prog_data
->binding_table
.render_target_start
= next_binding_table_offset
;
4744 next_binding_table_offset
+= MAX2(key
->nr_color_regions
, 1);
4746 assign_common_binding_table_offsets(next_binding_table_offset
);
4750 fs_visitor::calculate_register_pressure()
4752 invalidate_live_intervals();
4753 calculate_live_intervals();
4755 unsigned num_instructions
= 0;
4756 foreach_block(block
, cfg
)
4757 num_instructions
+= block
->instructions
.length();
4759 regs_live_at_ip
= rzalloc_array(mem_ctx
, int, num_instructions
);
4761 for (unsigned reg
= 0; reg
< alloc
.count
; reg
++) {
4762 for (int ip
= virtual_grf_start
[reg
]; ip
<= virtual_grf_end
[reg
]; ip
++)
4763 regs_live_at_ip
[ip
] += alloc
.sizes
[reg
];
4768 fs_visitor::optimize()
4770 /* bld is the common builder object pointing at the end of the program we
4771 * used to translate it into i965 IR. For the optimization and lowering
4772 * passes coming next, any code added after the end of the program without
4773 * having explicitly called fs_builder::at() clearly points at a mistake.
4774 * Ideally optimization passes wouldn't be part of the visitor so they
4775 * wouldn't have access to bld at all, but they do, so just in case some
4776 * pass forgets to ask for a location explicitly set it to NULL here to
4777 * make it trip. The dispatch width is initialized to a bogus value to
4778 * make sure that optimizations set the execution controls explicitly to
4779 * match the code they are manipulating instead of relying on the defaults.
4781 bld
= fs_builder(this, 64);
4783 split_virtual_grfs();
4785 assign_constant_locations();
4786 demote_pull_constants();
4788 #define OPT(pass, args...) ({ \
4790 bool this_progress = pass(args); \
4792 if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
4793 char filename[64]; \
4794 snprintf(filename, 64, "%s%d-%04d-%02d-%02d-" #pass, \
4795 stage_abbrev, dispatch_width, shader_prog ? shader_prog->Name : 0, iteration, pass_num); \
4797 backend_shader::dump_instructions(filename); \
4800 progress = progress || this_progress; \
4804 if (unlikely(INTEL_DEBUG
& DEBUG_OPTIMIZER
)) {
4806 snprintf(filename
, 64, "%s%d-%04d-00-start",
4807 stage_abbrev
, dispatch_width
,
4808 shader_prog
? shader_prog
->Name
: 0);
4810 backend_shader::dump_instructions(filename
);
4813 bool progress
= false;
4817 OPT(lower_simd_width
);
4818 OPT(lower_logical_sends
);
4825 OPT(remove_duplicate_mrf_writes
);
4829 OPT(opt_copy_propagate
);
4830 OPT(opt_peephole_predicated_break
);
4831 OPT(opt_cmod_propagation
);
4832 OPT(dead_code_eliminate
);
4833 OPT(opt_peephole_sel
);
4834 OPT(dead_control_flow_eliminate
, this);
4835 OPT(opt_register_renaming
);
4836 OPT(opt_redundant_discard_jumps
);
4837 OPT(opt_saturate_propagation
);
4838 OPT(opt_zero_samples
);
4839 OPT(register_coalesce
);
4840 OPT(compute_to_mrf
);
4841 OPT(eliminate_find_live_channel
);
4843 OPT(compact_virtual_grfs
);
4848 OPT(opt_sampler_eot
);
4850 if (OPT(lower_load_payload
)) {
4851 split_virtual_grfs();
4852 OPT(register_coalesce
);
4853 OPT(compute_to_mrf
);
4854 OPT(dead_code_eliminate
);
4857 OPT(opt_combine_constants
);
4858 OPT(lower_integer_multiplication
);
4860 lower_uniform_pull_constant_loads();
4864 * Three source instruction must have a GRF/MRF destination register.
4865 * ARF NULL is not allowed. Fix that up by allocating a temporary GRF.
4868 fs_visitor::fixup_3src_null_dest()
4870 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
4871 if (inst
->is_3src() && inst
->dst
.is_null()) {
4872 inst
->dst
= fs_reg(GRF
, alloc
.allocate(dispatch_width
/ 8),
4879 fs_visitor::allocate_registers()
4881 bool allocated_without_spills
;
4883 static const enum instruction_scheduler_mode pre_modes
[] = {
4885 SCHEDULE_PRE_NON_LIFO
,
4889 /* Try each scheduling heuristic to see if it can successfully register
4890 * allocate without spilling. They should be ordered by decreasing
4891 * performance but increasing likelihood of allocating.
4893 for (unsigned i
= 0; i
< ARRAY_SIZE(pre_modes
); i
++) {
4894 schedule_instructions(pre_modes
[i
]);
4897 assign_regs_trivial();
4898 allocated_without_spills
= true;
4900 allocated_without_spills
= assign_regs(false);
4902 if (allocated_without_spills
)
4906 if (!allocated_without_spills
) {
4907 /* We assume that any spilling is worse than just dropping back to
4908 * SIMD8. There's probably actually some intermediate point where
4909 * SIMD16 with a couple of spills is still better.
4911 if (dispatch_width
== 16) {
4912 fail("Failure to register allocate. Reduce number of "
4913 "live scalar values to avoid this.");
4915 compiler
->shader_perf_log(log_data
,
4916 "%s shader triggered register spilling. "
4917 "Try reducing the number of live scalar "
4918 "values to improve performance.\n",
4922 /* Since we're out of heuristics, just go spill registers until we
4923 * get an allocation.
4925 while (!assign_regs(true)) {
4931 /* This must come after all optimization and register allocation, since
4932 * it inserts dead code that happens to have side effects, and it does
4933 * so based on the actual physical registers in use.
4935 insert_gen4_send_dependency_workarounds();
4940 if (!allocated_without_spills
)
4941 schedule_instructions(SCHEDULE_POST
);
4943 if (last_scratch
> 0)
4944 prog_data
->total_scratch
= brw_get_scratch_size(last_scratch
);
4948 fs_visitor::run_vs(gl_clip_plane
*clip_planes
)
4950 assert(stage
== MESA_SHADER_VERTEX
);
4952 assign_common_binding_table_offsets(0);
4955 if (shader_time_index
>= 0)
4956 emit_shader_time_begin();
4963 compute_clip_distance(clip_planes
);
4967 if (shader_time_index
>= 0)
4968 emit_shader_time_end();
4974 assign_curb_setup();
4975 assign_vs_urb_setup();
4977 fixup_3src_null_dest();
4978 allocate_registers();
4984 fs_visitor::run_fs(bool do_rep_send
)
4986 brw_wm_prog_data
*wm_prog_data
= (brw_wm_prog_data
*) this->prog_data
;
4987 brw_wm_prog_key
*wm_key
= (brw_wm_prog_key
*) this->key
;
4989 assert(stage
== MESA_SHADER_FRAGMENT
);
4991 sanity_param_count
= prog
->Parameters
->NumParameters
;
4993 assign_binding_table_offsets();
4995 if (devinfo
->gen
>= 6)
4996 setup_payload_gen6();
4998 setup_payload_gen4();
5002 } else if (do_rep_send
) {
5003 assert(dispatch_width
== 16);
5004 emit_repclear_shader();
5006 if (shader_time_index
>= 0)
5007 emit_shader_time_begin();
5009 calculate_urb_setup();
5010 if (prog
->InputsRead
> 0) {
5011 if (devinfo
->gen
< 6)
5012 emit_interpolation_setup_gen4();
5014 emit_interpolation_setup_gen6();
5017 /* We handle discards by keeping track of the still-live pixels in f0.1.
5018 * Initialize it with the dispatched pixels.
5020 if (wm_prog_data
->uses_kill
) {
5021 fs_inst
*discard_init
= bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
5022 discard_init
->flag_subreg
= 1;
5025 /* Generate FS IR for main(). (the visitor only descends into
5026 * functions called "main").
5033 if (wm_prog_data
->uses_kill
)
5034 bld
.emit(FS_OPCODE_PLACEHOLDER_HALT
);
5036 if (wm_key
->alpha_test_func
)
5041 if (shader_time_index
>= 0)
5042 emit_shader_time_end();
5048 assign_curb_setup();
5051 fixup_3src_null_dest();
5052 allocate_registers();
5058 if (dispatch_width
== 8)
5059 wm_prog_data
->reg_blocks
= brw_register_blocks(grf_used
);
5061 wm_prog_data
->reg_blocks_16
= brw_register_blocks(grf_used
);
5063 /* If any state parameters were appended, then ParameterValues could have
5064 * been realloced, in which case the driver uniform storage set up by
5065 * _mesa_associate_uniform_storage() would point to freed memory. Make
5066 * sure that didn't happen.
5068 assert(sanity_param_count
== prog
->Parameters
->NumParameters
);
5074 fs_visitor::run_cs()
5076 assert(stage
== MESA_SHADER_COMPUTE
);
5079 sanity_param_count
= prog
->Parameters
->NumParameters
;
5081 assign_common_binding_table_offsets(0);
5085 if (shader_time_index
>= 0)
5086 emit_shader_time_begin();
5093 emit_cs_terminate();
5095 if (shader_time_index
>= 0)
5096 emit_shader_time_end();
5102 assign_curb_setup();
5104 fixup_3src_null_dest();
5105 allocate_registers();
5110 /* If any state parameters were appended, then ParameterValues could have
5111 * been realloced, in which case the driver uniform storage set up by
5112 * _mesa_associate_uniform_storage() would point to freed memory. Make
5113 * sure that didn't happen.
5115 assert(sanity_param_count
== prog
->Parameters
->NumParameters
);
5121 brw_wm_fs_emit(struct brw_context
*brw
,
5123 const struct brw_wm_prog_key
*key
,
5124 struct brw_wm_prog_data
*prog_data
,
5125 struct gl_fragment_program
*fp
,
5126 struct gl_shader_program
*prog
,
5127 unsigned *final_assembly_size
)
5129 bool start_busy
= false;
5130 double start_time
= 0;
5132 if (unlikely(brw
->perf_debug
)) {
5133 start_busy
= (brw
->batch
.last_bo
&&
5134 drm_intel_bo_busy(brw
->batch
.last_bo
));
5135 start_time
= get_time();
5138 struct brw_shader
*shader
= NULL
;
5140 shader
= (brw_shader
*) prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
5142 if (unlikely(INTEL_DEBUG
& DEBUG_WM
))
5143 brw_dump_ir("fragment", prog
, &shader
->base
, &fp
->Base
);
5145 int st_index8
= -1, st_index16
= -1;
5146 if (INTEL_DEBUG
& DEBUG_SHADER_TIME
) {
5147 st_index8
= brw_get_shader_time_index(brw
, prog
, &fp
->Base
, ST_FS8
);
5148 st_index16
= brw_get_shader_time_index(brw
, prog
, &fp
->Base
, ST_FS16
);
5151 /* Now the main event: Visit the shader IR and generate our FS IR for it.
5153 fs_visitor
v(brw
->intelScreen
->compiler
, brw
,
5154 mem_ctx
, MESA_SHADER_FRAGMENT
, key
, &prog_data
->base
,
5155 prog
, &fp
->Base
, 8, st_index8
);
5156 if (!v
.run_fs(false /* do_rep_send */)) {
5158 prog
->LinkStatus
= false;
5159 ralloc_strcat(&prog
->InfoLog
, v
.fail_msg
);
5162 _mesa_problem(NULL
, "Failed to compile fragment shader: %s\n",
5168 cfg_t
*simd16_cfg
= NULL
;
5169 fs_visitor
v2(brw
->intelScreen
->compiler
, brw
,
5170 mem_ctx
, MESA_SHADER_FRAGMENT
, key
, &prog_data
->base
,
5171 prog
, &fp
->Base
, 16, st_index16
);
5172 if (likely(!(INTEL_DEBUG
& DEBUG_NO16
) || brw
->use_rep_send
)) {
5173 if (!v
.simd16_unsupported
) {
5174 /* Try a SIMD16 compile */
5175 v2
.import_uniforms(&v
);
5176 if (!v2
.run_fs(brw
->use_rep_send
)) {
5177 perf_debug("SIMD16 shader failed to compile: %s", v2
.fail_msg
);
5179 simd16_cfg
= v2
.cfg
;
5185 int no_simd8
= (INTEL_DEBUG
& DEBUG_NO8
) || brw
->no_simd8
;
5186 if ((no_simd8
|| brw
->gen
< 5) && simd16_cfg
) {
5188 prog_data
->no_8
= true;
5191 prog_data
->no_8
= false;
5194 fs_generator
g(brw
->intelScreen
->compiler
, brw
,
5195 mem_ctx
, (void *) key
, &prog_data
->base
,
5196 &fp
->Base
, v
.promoted_constants
, v
.runtime_check_aads_emit
, "FS");
5198 if (unlikely(INTEL_DEBUG
& DEBUG_WM
)) {
5201 name
= ralloc_asprintf(mem_ctx
, "%s fragment shader %d",
5202 prog
->Label
? prog
->Label
: "unnamed",
5205 name
= ralloc_asprintf(mem_ctx
, "fragment program %d", fp
->Base
.Id
);
5207 g
.enable_debug(name
);
5211 g
.generate_code(simd8_cfg
, 8);
5213 prog_data
->prog_offset_16
= g
.generate_code(simd16_cfg
, 16);
5215 if (unlikely(brw
->perf_debug
) && shader
) {
5216 if (shader
->compiled_once
)
5217 brw_wm_debug_recompile(brw
, prog
, key
);
5218 shader
->compiled_once
= true;
5220 if (start_busy
&& !drm_intel_bo_busy(brw
->batch
.last_bo
)) {
5221 perf_debug("FS compile took %.03f ms and stalled the GPU\n",
5222 (get_time() - start_time
) * 1000);
5226 return g
.get_assembly(final_assembly_size
);
5230 brw_fs_precompile(struct gl_context
*ctx
,
5231 struct gl_shader_program
*shader_prog
,
5232 struct gl_program
*prog
)
5234 struct brw_context
*brw
= brw_context(ctx
);
5235 struct brw_wm_prog_key key
;
5237 struct gl_fragment_program
*fp
= (struct gl_fragment_program
*) prog
;
5238 struct brw_fragment_program
*bfp
= brw_fragment_program(fp
);
5239 bool program_uses_dfdy
= fp
->UsesDFdy
;
5241 memset(&key
, 0, sizeof(key
));
5245 key
.iz_lookup
|= IZ_PS_KILL_ALPHATEST_BIT
;
5247 if (fp
->Base
.OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
))
5248 key
.iz_lookup
|= IZ_PS_COMPUTES_DEPTH_BIT
;
5250 /* Just assume depth testing. */
5251 key
.iz_lookup
|= IZ_DEPTH_TEST_ENABLE_BIT
;
5252 key
.iz_lookup
|= IZ_DEPTH_WRITE_ENABLE_BIT
;
5255 if (brw
->gen
< 6 || _mesa_bitcount_64(fp
->Base
.InputsRead
&
5256 BRW_FS_VARYING_INPUT_MASK
) > 16)
5257 key
.input_slots_valid
= fp
->Base
.InputsRead
| VARYING_BIT_POS
;
5259 brw_setup_tex_for_precompile(brw
, &key
.tex
, &fp
->Base
);
5261 if (fp
->Base
.InputsRead
& VARYING_BIT_POS
) {
5262 key
.drawable_height
= ctx
->DrawBuffer
->Height
;
5265 key
.nr_color_regions
= _mesa_bitcount_64(fp
->Base
.OutputsWritten
&
5266 ~(BITFIELD64_BIT(FRAG_RESULT_DEPTH
) |
5267 BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK
)));
5269 if ((fp
->Base
.InputsRead
& VARYING_BIT_POS
) || program_uses_dfdy
) {
5270 key
.render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
) ||
5271 key
.nr_color_regions
> 1;
5274 key
.program_string_id
= bfp
->id
;
5276 uint32_t old_prog_offset
= brw
->wm
.base
.prog_offset
;
5277 struct brw_wm_prog_data
*old_prog_data
= brw
->wm
.prog_data
;
5279 bool success
= brw_codegen_wm_prog(brw
, shader_prog
, bfp
, &key
);
5281 brw
->wm
.base
.prog_offset
= old_prog_offset
;
5282 brw
->wm
.prog_data
= old_prog_data
;
5288 brw_setup_tex_for_precompile(struct brw_context
*brw
,
5289 struct brw_sampler_prog_key_data
*tex
,
5290 struct gl_program
*prog
)
5292 const bool has_shader_channel_select
= brw
->is_haswell
|| brw
->gen
>= 8;
5293 unsigned sampler_count
= _mesa_fls(prog
->SamplersUsed
);
5294 for (unsigned i
= 0; i
< sampler_count
; i
++) {
5295 if (!has_shader_channel_select
&& (prog
->ShadowSamplers
& (1 << i
))) {
5296 /* Assume DEPTH_TEXTURE_MODE is the default: X, X, X, 1 */
5298 MAKE_SWIZZLE4(SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_ONE
);
5300 /* Color sampler: assume no swizzling. */
5301 tex
->swizzles
[i
] = SWIZZLE_XYZW
;