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
33 #include <sys/types.h>
35 #include "util/hash_table.h"
36 #include "main/macros.h"
37 #include "main/shaderobj.h"
38 #include "main/fbobject.h"
39 #include "program/prog_parameter.h"
40 #include "program/prog_print.h"
41 #include "util/register_allocate.h"
42 #include "program/hash_table.h"
43 #include "brw_context.h"
49 #include "brw_dead_control_flow.h"
50 #include "main/uniforms.h"
51 #include "brw_fs_live_variables.h"
52 #include "glsl/glsl_types.h"
53 #include "program/sampler.h"
56 fs_inst::init(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
57 const fs_reg
*src
, unsigned sources
)
59 memset(this, 0, sizeof(*this));
61 this->src
= new fs_reg
[MAX2(sources
, 3)];
62 for (unsigned i
= 0; i
< sources
; i
++)
63 this->src
[i
] = src
[i
];
65 this->opcode
= opcode
;
67 this->sources
= sources
;
68 this->exec_size
= exec_size
;
70 assert(dst
.file
!= IMM
&& dst
.file
!= UNIFORM
);
72 /* If exec_size == 0, try to guess it from the registers. Since all
73 * manner of things may use hardware registers, we first try to guess
74 * based on GRF registers. If this fails, we will go ahead and take the
75 * width from the destination register.
77 if (this->exec_size
== 0) {
78 if (dst
.file
== GRF
) {
79 this->exec_size
= dst
.width
;
81 for (unsigned i
= 0; i
< sources
; ++i
) {
82 if (src
[i
].file
!= GRF
&& src
[i
].file
!= ATTR
)
85 if (this->exec_size
<= 1)
86 this->exec_size
= src
[i
].width
;
87 assert(src
[i
].width
== 1 || src
[i
].width
== this->exec_size
);
91 if (this->exec_size
== 0 && dst
.file
!= BAD_FILE
)
92 this->exec_size
= dst
.width
;
94 assert(this->exec_size
!= 0);
96 for (unsigned i
= 0; i
< sources
; ++i
) {
97 switch (this->src
[i
].file
) {
99 this->src
[i
].effective_width
= 8;
104 assert(this->src
[i
].width
> 0);
105 if (this->src
[i
].width
== 1) {
106 this->src
[i
].effective_width
= this->exec_size
;
108 this->src
[i
].effective_width
= this->src
[i
].width
;
113 this->src
[i
].effective_width
= this->exec_size
;
116 unreachable("Invalid source register file");
119 this->dst
.effective_width
= this->exec_size
;
121 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
123 /* This will be the case for almost all instructions. */
130 DIV_ROUND_UP(MAX2(dst
.width
* dst
.stride
, 1) * type_sz(dst
.type
), 32);
133 this->regs_written
= 0;
137 unreachable("Invalid destination register file");
139 unreachable("Invalid register file");
142 this->writes_accumulator
= false;
147 init(BRW_OPCODE_NOP
, 8, dst
, NULL
, 0);
150 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
)
152 init(opcode
, exec_size
, reg_undef
, NULL
, 0);
155 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
)
157 init(opcode
, 0, dst
, NULL
, 0);
160 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
163 const fs_reg src
[1] = { src0
};
164 init(opcode
, exec_size
, dst
, src
, 1);
167 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
)
169 const fs_reg src
[1] = { src0
};
170 init(opcode
, 0, dst
, src
, 1);
173 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
174 const fs_reg
&src0
, const fs_reg
&src1
)
176 const fs_reg src
[2] = { src0
, src1
};
177 init(opcode
, exec_size
, dst
, src
, 2);
180 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
183 const fs_reg src
[2] = { src0
, src1
};
184 init(opcode
, 0, dst
, src
, 2);
187 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
188 const fs_reg
&src0
, const fs_reg
&src1
, const fs_reg
&src2
)
190 const fs_reg src
[3] = { src0
, src1
, src2
};
191 init(opcode
, exec_size
, dst
, src
, 3);
194 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
195 const fs_reg
&src1
, const fs_reg
&src2
)
197 const fs_reg src
[3] = { src0
, src1
, src2
};
198 init(opcode
, 0, dst
, src
, 3);
201 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
,
202 const fs_reg src
[], unsigned sources
)
204 init(opcode
, 0, dst
, src
, sources
);
207 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_width
, const fs_reg
&dst
,
208 const fs_reg src
[], unsigned sources
)
210 init(opcode
, exec_width
, dst
, src
, sources
);
213 fs_inst::fs_inst(const fs_inst
&that
)
215 memcpy(this, &that
, sizeof(that
));
217 this->src
= new fs_reg
[MAX2(that
.sources
, 3)];
219 for (unsigned i
= 0; i
< that
.sources
; i
++)
220 this->src
[i
] = that
.src
[i
];
229 fs_inst::resize_sources(uint8_t num_sources
)
231 if (this->sources
!= num_sources
) {
232 fs_reg
*src
= new fs_reg
[MAX2(num_sources
, 3)];
234 for (unsigned i
= 0; i
< MIN2(this->sources
, num_sources
); ++i
)
235 src
[i
] = this->src
[i
];
239 this->sources
= num_sources
;
245 fs_visitor::op(const fs_reg &dst, const fs_reg &src0) \
247 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0); \
252 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
253 const fs_reg &src1) \
255 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1); \
258 #define ALU2_ACC(op) \
260 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
261 const fs_reg &src1) \
263 fs_inst *inst = new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1);\
264 inst->writes_accumulator = true; \
270 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
271 const fs_reg &src1, const fs_reg &src2) \
273 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1, src2);\
305 /** Gen4 predicated IF. */
307 fs_visitor::IF(enum brw_predicate predicate
)
309 fs_inst
*inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_IF
, dispatch_width
);
310 inst
->predicate
= predicate
;
314 /** Gen6 IF with embedded comparison. */
316 fs_visitor::IF(const fs_reg
&src0
, const fs_reg
&src1
,
317 enum brw_conditional_mod condition
)
319 assert(brw
->gen
== 6);
320 fs_inst
*inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_IF
, dispatch_width
,
321 reg_null_d
, src0
, src1
);
322 inst
->conditional_mod
= condition
;
327 * CMP: Sets the low bit of the destination channels with the result
328 * of the comparison, while the upper bits are undefined, and updates
329 * the flag register with the packed 16 bits of the result.
332 fs_visitor::CMP(fs_reg dst
, fs_reg src0
, fs_reg src1
,
333 enum brw_conditional_mod condition
)
337 /* Take the instruction:
339 * CMP null<d> src0<f> src1<f>
341 * Original gen4 does type conversion to the destination type before
342 * comparison, producing garbage results for floating point comparisons.
344 * The destination type doesn't matter on newer generations, so we set the
345 * type to match src0 so we can compact the instruction.
347 dst
.type
= src0
.type
;
348 if (dst
.file
== HW_REG
)
349 dst
.fixed_hw_reg
.type
= dst
.type
;
351 resolve_ud_negate(&src0
);
352 resolve_ud_negate(&src1
);
354 inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_CMP
, dst
, src0
, src1
);
355 inst
->conditional_mod
= condition
;
361 fs_visitor::LOAD_PAYLOAD(const fs_reg
&dst
, fs_reg
*src
, int sources
)
363 uint8_t exec_size
= dst
.width
;
364 for (int i
= 0; i
< sources
; ++i
) {
365 assert(src
[i
].width
% dst
.width
== 0);
366 if (src
[i
].width
> exec_size
)
367 exec_size
= src
[i
].width
;
370 fs_inst
*inst
= new(mem_ctx
) fs_inst(SHADER_OPCODE_LOAD_PAYLOAD
, exec_size
,
372 inst
->regs_written
= 0;
373 for (int i
= 0; i
< sources
; ++i
) {
374 /* The LOAD_PAYLOAD instruction only really makes sense if we are
375 * dealing with whole registers. If this ever changes, we can deal
378 int size
= inst
->src
[i
].effective_width
* type_sz(src
[i
].type
);
379 assert(size
% 32 == 0);
380 inst
->regs_written
+= (size
+ 31) / 32;
387 fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_reg
&dst
,
388 const fs_reg
&surf_index
,
389 const fs_reg
&varying_offset
,
390 uint32_t const_offset
)
392 exec_list instructions
;
395 /* We have our constant surface use a pitch of 4 bytes, so our index can
396 * be any component of a vector, and then we load 4 contiguous
397 * components starting from that.
399 * We break down the const_offset to a portion added to the variable
400 * offset and a portion done using reg_offset, which means that if you
401 * have GLSL using something like "uniform vec4 a[20]; gl_FragColor =
402 * a[i]", we'll temporarily generate 4 vec4 loads from offset i * 4, and
403 * CSE can later notice that those loads are all the same and eliminate
404 * the redundant ones.
406 fs_reg vec4_offset
= vgrf(glsl_type::int_type
);
407 instructions
.push_tail(ADD(vec4_offset
,
408 varying_offset
, fs_reg(const_offset
& ~3)));
411 if (brw
->gen
== 4 && dst
.width
== 8) {
412 /* Pre-gen5, we can either use a SIMD8 message that requires (header,
413 * u, v, r) as parameters, or we can just use the SIMD16 message
414 * consisting of (header, u). We choose the second, at the cost of a
415 * longer return length.
422 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
;
424 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
;
426 assert(dst
.width
% 8 == 0);
427 int regs_written
= 4 * (dst
.width
/ 8) * scale
;
428 fs_reg vec4_result
= fs_reg(GRF
, alloc
.allocate(regs_written
),
429 dst
.type
, dst
.width
);
430 inst
= new(mem_ctx
) fs_inst(op
, vec4_result
, surf_index
, vec4_offset
);
431 inst
->regs_written
= regs_written
;
432 instructions
.push_tail(inst
);
436 inst
->header_present
= true;
440 inst
->mlen
= 1 + dispatch_width
/ 8;
443 fs_reg result
= offset(vec4_result
, (const_offset
& 3) * scale
);
444 instructions
.push_tail(MOV(dst
, result
));
450 * A helper for MOV generation for fixing up broken hardware SEND dependency
454 fs_visitor::DEP_RESOLVE_MOV(int grf
)
456 fs_inst
*inst
= MOV(brw_null_reg(), fs_reg(GRF
, grf
, BRW_REGISTER_TYPE_F
));
459 inst
->annotation
= "send dependency resolve";
461 /* The caller always wants uncompressed to emit the minimal extra
462 * dependencies, and to avoid having to deal with aligning its regs to 2.
470 fs_inst::equals(fs_inst
*inst
) const
472 return (opcode
== inst
->opcode
&&
473 dst
.equals(inst
->dst
) &&
474 src
[0].equals(inst
->src
[0]) &&
475 src
[1].equals(inst
->src
[1]) &&
476 src
[2].equals(inst
->src
[2]) &&
477 saturate
== inst
->saturate
&&
478 predicate
== inst
->predicate
&&
479 conditional_mod
== inst
->conditional_mod
&&
480 mlen
== inst
->mlen
&&
481 base_mrf
== inst
->base_mrf
&&
482 target
== inst
->target
&&
484 header_present
== inst
->header_present
&&
485 shadow_compare
== inst
->shadow_compare
&&
486 exec_size
== inst
->exec_size
&&
487 offset
== inst
->offset
);
491 fs_inst::overwrites_reg(const fs_reg
®
) const
493 return (reg
.file
== dst
.file
&&
494 reg
.reg
== dst
.reg
&&
495 reg
.reg_offset
>= dst
.reg_offset
&&
496 reg
.reg_offset
< dst
.reg_offset
+ regs_written
);
500 fs_inst::is_send_from_grf() const
503 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
504 case SHADER_OPCODE_SHADER_TIME_ADD
:
505 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
506 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
507 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
508 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
509 case SHADER_OPCODE_UNTYPED_ATOMIC
:
510 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
511 case SHADER_OPCODE_URB_WRITE_SIMD8
:
513 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
514 return src
[1].file
== GRF
;
515 case FS_OPCODE_FB_WRITE
:
516 return src
[0].file
== GRF
;
519 return src
[0].file
== GRF
;
526 fs_inst::can_do_source_mods(struct brw_context
*brw
)
528 if (brw
->gen
== 6 && is_math())
531 if (is_send_from_grf())
534 if (!backend_instruction::can_do_source_mods())
543 memset(this, 0, sizeof(*this));
547 /** Generic unset register constructor. */
551 this->file
= BAD_FILE
;
554 /** Immediate value constructor. */
555 fs_reg::fs_reg(float f
)
559 this->type
= BRW_REGISTER_TYPE_F
;
560 this->fixed_hw_reg
.dw1
.f
= f
;
564 /** Immediate value constructor. */
565 fs_reg::fs_reg(int32_t i
)
569 this->type
= BRW_REGISTER_TYPE_D
;
570 this->fixed_hw_reg
.dw1
.d
= i
;
574 /** Immediate value constructor. */
575 fs_reg::fs_reg(uint32_t u
)
579 this->type
= BRW_REGISTER_TYPE_UD
;
580 this->fixed_hw_reg
.dw1
.ud
= u
;
584 /** Vector float immediate value constructor. */
585 fs_reg::fs_reg(uint8_t vf
[4])
589 this->type
= BRW_REGISTER_TYPE_VF
;
590 memcpy(&this->fixed_hw_reg
.dw1
.ud
, vf
, sizeof(unsigned));
593 /** Vector float immediate value constructor. */
594 fs_reg::fs_reg(uint8_t vf0
, uint8_t vf1
, uint8_t vf2
, uint8_t vf3
)
598 this->type
= BRW_REGISTER_TYPE_VF
;
599 this->fixed_hw_reg
.dw1
.ud
= (vf0
<< 0) |
605 /** Fixed brw_reg. */
606 fs_reg::fs_reg(struct brw_reg fixed_hw_reg
)
610 this->fixed_hw_reg
= fixed_hw_reg
;
611 this->type
= fixed_hw_reg
.type
;
612 this->width
= 1 << fixed_hw_reg
.width
;
616 fs_reg::equals(const fs_reg
&r
) const
618 return (file
== r
.file
&&
620 reg_offset
== r
.reg_offset
&&
621 subreg_offset
== r
.subreg_offset
&&
623 negate
== r
.negate
&&
625 !reladdr
&& !r
.reladdr
&&
626 memcmp(&fixed_hw_reg
, &r
.fixed_hw_reg
, sizeof(fixed_hw_reg
)) == 0 &&
632 fs_reg::set_smear(unsigned subreg
)
634 assert(file
!= HW_REG
&& file
!= IMM
);
635 subreg_offset
= subreg
* type_sz(type
);
641 fs_reg::is_contiguous() const
647 fs_visitor::type_size(const struct glsl_type
*type
)
649 unsigned int size
, i
;
651 switch (type
->base_type
) {
654 case GLSL_TYPE_FLOAT
:
656 return type
->components();
657 case GLSL_TYPE_ARRAY
:
658 return type_size(type
->fields
.array
) * type
->length
;
659 case GLSL_TYPE_STRUCT
:
661 for (i
= 0; i
< type
->length
; i
++) {
662 size
+= type_size(type
->fields
.structure
[i
].type
);
665 case GLSL_TYPE_SAMPLER
:
666 /* Samplers take up no register space, since they're baked in at
670 case GLSL_TYPE_ATOMIC_UINT
:
672 case GLSL_TYPE_IMAGE
:
674 case GLSL_TYPE_ERROR
:
675 case GLSL_TYPE_INTERFACE
:
676 unreachable("not reached");
683 fs_visitor::get_timestamp()
685 assert(brw
->gen
>= 7);
687 fs_reg ts
= fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE
,
690 BRW_REGISTER_TYPE_UD
));
692 fs_reg dst
= fs_reg(GRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
, 4);
694 fs_inst
*mov
= emit(MOV(dst
, ts
));
695 /* We want to read the 3 fields we care about even if it's not enabled in
698 mov
->force_writemask_all
= true;
700 /* The caller wants the low 32 bits of the timestamp. Since it's running
701 * at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,
702 * which is plenty of time for our purposes. It is identical across the
703 * EUs, but since it's tracking GPU core speed it will increment at a
704 * varying rate as render P-states change.
706 * The caller could also check if render P-states have changed (or anything
707 * else that might disrupt timing) by setting smear to 2 and checking if
708 * that field is != 0.
716 fs_visitor::emit_shader_time_begin()
718 current_annotation
= "shader time start";
719 shader_start_time
= get_timestamp();
723 fs_visitor::emit_shader_time_end()
725 current_annotation
= "shader time end";
727 enum shader_time_shader_type type
, written_type
, reset_type
;
729 case MESA_SHADER_VERTEX
:
731 written_type
= ST_VS_WRITTEN
;
732 reset_type
= ST_VS_RESET
;
734 case MESA_SHADER_GEOMETRY
:
736 written_type
= ST_GS_WRITTEN
;
737 reset_type
= ST_GS_RESET
;
739 case MESA_SHADER_FRAGMENT
:
740 if (dispatch_width
== 8) {
742 written_type
= ST_FS8_WRITTEN
;
743 reset_type
= ST_FS8_RESET
;
745 assert(dispatch_width
== 16);
747 written_type
= ST_FS16_WRITTEN
;
748 reset_type
= ST_FS16_RESET
;
752 unreachable("fs_visitor::emit_shader_time_end missing code");
755 fs_reg shader_end_time
= get_timestamp();
757 /* Check that there weren't any timestamp reset events (assuming these
758 * were the only two timestamp reads that happened).
760 fs_reg reset
= shader_end_time
;
762 fs_inst
*test
= emit(AND(reg_null_d
, reset
, fs_reg(1u)));
763 test
->conditional_mod
= BRW_CONDITIONAL_Z
;
764 emit(IF(BRW_PREDICATE_NORMAL
));
766 fs_reg start
= shader_start_time
;
768 fs_reg diff
= fs_reg(GRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
, 1);
769 emit(ADD(diff
, start
, shader_end_time
));
771 /* If there were no instructions between the two timestamp gets, the diff
772 * is 2 cycles. Remove that overhead, so I can forget about that when
773 * trying to determine the time taken for single instructions.
775 emit(ADD(diff
, diff
, fs_reg(-2u)));
777 emit_shader_time_write(type
, diff
);
778 emit_shader_time_write(written_type
, fs_reg(1u));
779 emit(BRW_OPCODE_ELSE
);
780 emit_shader_time_write(reset_type
, fs_reg(1u));
781 emit(BRW_OPCODE_ENDIF
);
785 fs_visitor::emit_shader_time_write(enum shader_time_shader_type type
,
788 int shader_time_index
=
789 brw_get_shader_time_index(brw
, shader_prog
, prog
, type
);
790 fs_reg offset
= fs_reg(shader_time_index
* SHADER_TIME_STRIDE
);
793 if (dispatch_width
== 8)
794 payload
= vgrf(glsl_type::uvec2_type
);
796 payload
= vgrf(glsl_type::uint_type
);
798 emit(new(mem_ctx
) fs_inst(SHADER_OPCODE_SHADER_TIME_ADD
,
799 fs_reg(), payload
, offset
, value
));
803 fs_visitor::vfail(const char *format
, va_list va
)
812 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
813 msg
= ralloc_asprintf(mem_ctx
, "FS compile failed: %s\n", msg
);
815 this->fail_msg
= msg
;
817 if (INTEL_DEBUG
& DEBUG_WM
) {
818 fprintf(stderr
, "%s", msg
);
823 fs_visitor::fail(const char *format
, ...)
827 va_start(va
, format
);
833 * Mark this program as impossible to compile in SIMD16 mode.
835 * During the SIMD8 compile (which happens first), we can detect and flag
836 * things that are unsupported in SIMD16 mode, so the compiler can skip
837 * the SIMD16 compile altogether.
839 * During a SIMD16 compile (if one happens anyway), this just calls fail().
842 fs_visitor::no16(const char *format
, ...)
846 va_start(va
, format
);
848 if (dispatch_width
== 16) {
851 simd16_unsupported
= true;
853 if (brw
->perf_debug
) {
855 ralloc_vasprintf_append(&no16_msg
, format
, va
);
857 no16_msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
865 fs_visitor::emit(enum opcode opcode
)
867 return emit(new(mem_ctx
) fs_inst(opcode
, dispatch_width
));
871 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
)
873 return emit(new(mem_ctx
) fs_inst(opcode
, dst
));
877 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
)
879 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
));
883 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
886 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
, src1
));
890 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
891 const fs_reg
&src1
, const fs_reg
&src2
)
893 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
, src1
, src2
));
897 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
,
898 fs_reg src
[], int sources
)
900 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src
, sources
));
904 * Returns true if the instruction has a flag that means it won't
905 * update an entire destination register.
907 * For example, dead code elimination and live variable analysis want to know
908 * when a write to a variable screens off any preceding values that were in
912 fs_inst::is_partial_write() const
914 return ((this->predicate
&& this->opcode
!= BRW_OPCODE_SEL
) ||
915 (this->dst
.width
* type_sz(this->dst
.type
)) < 32 ||
916 !this->dst
.is_contiguous());
920 fs_inst::regs_read(int arg
) const
922 if (is_tex() && arg
== 0 && src
[0].file
== GRF
) {
924 } else if (opcode
== FS_OPCODE_FB_WRITE
&& arg
== 0) {
926 } else if (opcode
== SHADER_OPCODE_URB_WRITE_SIMD8
&& arg
== 0) {
928 } else if (opcode
== SHADER_OPCODE_UNTYPED_ATOMIC
&& arg
== 0) {
930 } else if (opcode
== SHADER_OPCODE_UNTYPED_SURFACE_READ
&& arg
== 0) {
932 } else if (opcode
== FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
&& arg
== 0) {
936 switch (src
[arg
].file
) {
943 if (src
[arg
].stride
== 0) {
946 int size
= src
[arg
].width
* src
[arg
].stride
* type_sz(src
[arg
].type
);
947 return (size
+ 31) / 32;
950 unreachable("MRF registers are not allowed as sources");
952 unreachable("Invalid register file");
957 fs_inst::reads_flag() const
963 fs_inst::writes_flag() const
965 return (conditional_mod
&& (opcode
!= BRW_OPCODE_SEL
&&
966 opcode
!= BRW_OPCODE_IF
&&
967 opcode
!= BRW_OPCODE_WHILE
)) ||
968 opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
;
972 * Returns how many MRFs an FS opcode will write over.
974 * Note that this is not the 0 or 1 implied writes in an actual gen
975 * instruction -- the FS opcodes often generate MOVs in addition.
978 fs_visitor::implied_mrf_writes(fs_inst
*inst
)
983 if (inst
->base_mrf
== -1)
986 switch (inst
->opcode
) {
987 case SHADER_OPCODE_RCP
:
988 case SHADER_OPCODE_RSQ
:
989 case SHADER_OPCODE_SQRT
:
990 case SHADER_OPCODE_EXP2
:
991 case SHADER_OPCODE_LOG2
:
992 case SHADER_OPCODE_SIN
:
993 case SHADER_OPCODE_COS
:
994 return 1 * dispatch_width
/ 8;
995 case SHADER_OPCODE_POW
:
996 case SHADER_OPCODE_INT_QUOTIENT
:
997 case SHADER_OPCODE_INT_REMAINDER
:
998 return 2 * dispatch_width
/ 8;
999 case SHADER_OPCODE_TEX
:
1001 case SHADER_OPCODE_TXD
:
1002 case SHADER_OPCODE_TXF
:
1003 case SHADER_OPCODE_TXF_CMS
:
1004 case SHADER_OPCODE_TXF_MCS
:
1005 case SHADER_OPCODE_TG4
:
1006 case SHADER_OPCODE_TG4_OFFSET
:
1007 case SHADER_OPCODE_TXL
:
1008 case SHADER_OPCODE_TXS
:
1009 case SHADER_OPCODE_LOD
:
1011 case FS_OPCODE_FB_WRITE
:
1013 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
1014 case SHADER_OPCODE_GEN4_SCRATCH_READ
:
1016 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
:
1018 case SHADER_OPCODE_GEN4_SCRATCH_WRITE
:
1020 case SHADER_OPCODE_UNTYPED_ATOMIC
:
1021 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
1022 case SHADER_OPCODE_URB_WRITE_SIMD8
:
1023 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
1024 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
1025 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
1026 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
1029 unreachable("not reached");
1034 fs_visitor::vgrf(const glsl_type
*const type
)
1036 int reg_width
= dispatch_width
/ 8;
1037 return fs_reg(GRF
, alloc
.allocate(type_size(type
) * reg_width
),
1038 brw_type_for_base_type(type
), dispatch_width
);
1042 fs_visitor::vgrf(int num_components
)
1044 int reg_width
= dispatch_width
/ 8;
1045 return fs_reg(GRF
, alloc
.allocate(num_components
* reg_width
),
1046 BRW_REGISTER_TYPE_F
, dispatch_width
);
1049 /** Fixed HW reg constructor. */
1050 fs_reg::fs_reg(enum register_file file
, int reg
)
1055 this->type
= BRW_REGISTER_TYPE_F
;
1066 /** Fixed HW reg constructor. */
1067 fs_reg::fs_reg(enum register_file file
, int reg
, enum brw_reg_type type
)
1083 /** Fixed HW reg constructor. */
1084 fs_reg::fs_reg(enum register_file file
, int reg
, enum brw_reg_type type
,
1091 this->width
= width
;
1095 fs_visitor::variable_storage(ir_variable
*var
)
1097 return (fs_reg
*)hash_table_find(this->variable_ht
, var
);
1101 import_uniforms_callback(const void *key
,
1105 struct hash_table
*dst_ht
= (struct hash_table
*)closure
;
1106 const fs_reg
*reg
= (const fs_reg
*)data
;
1108 if (reg
->file
!= UNIFORM
)
1111 hash_table_insert(dst_ht
, data
, key
);
1114 /* For SIMD16, we need to follow from the uniform setup of SIMD8 dispatch.
1115 * This brings in those uniform definitions
1118 fs_visitor::import_uniforms(fs_visitor
*v
)
1120 hash_table_call_foreach(v
->variable_ht
,
1121 import_uniforms_callback
,
1123 this->push_constant_loc
= v
->push_constant_loc
;
1124 this->pull_constant_loc
= v
->pull_constant_loc
;
1125 this->uniforms
= v
->uniforms
;
1126 this->param_size
= v
->param_size
;
1129 /* Our support for uniforms is piggy-backed on the struct
1130 * gl_fragment_program, because that's where the values actually
1131 * get stored, rather than in some global gl_shader_program uniform
1135 fs_visitor::setup_uniform_values(ir_variable
*ir
)
1137 int namelen
= strlen(ir
->name
);
1139 /* The data for our (non-builtin) uniforms is stored in a series of
1140 * gl_uniform_driver_storage structs for each subcomponent that
1141 * glGetUniformLocation() could name. We know it's been set up in the same
1142 * order we'd walk the type, so walk the list of storage and find anything
1143 * with our name, or the prefix of a component that starts with our name.
1145 unsigned params_before
= uniforms
;
1146 for (unsigned u
= 0; u
< shader_prog
->NumUserUniformStorage
; u
++) {
1147 struct gl_uniform_storage
*storage
= &shader_prog
->UniformStorage
[u
];
1149 if (strncmp(ir
->name
, storage
->name
, namelen
) != 0 ||
1150 (storage
->name
[namelen
] != 0 &&
1151 storage
->name
[namelen
] != '.' &&
1152 storage
->name
[namelen
] != '[')) {
1156 unsigned slots
= storage
->type
->component_slots();
1157 if (storage
->array_elements
)
1158 slots
*= storage
->array_elements
;
1160 for (unsigned i
= 0; i
< slots
; i
++) {
1161 stage_prog_data
->param
[uniforms
++] = &storage
->storage
[i
];
1165 /* Make sure we actually initialized the right amount of stuff here. */
1166 assert(params_before
+ ir
->type
->component_slots() == uniforms
);
1167 (void)params_before
;
1171 /* Our support for builtin uniforms is even scarier than non-builtin.
1172 * It sits on top of the PROG_STATE_VAR parameters that are
1173 * automatically updated from GL context state.
1176 fs_visitor::setup_builtin_uniform_values(ir_variable
*ir
)
1178 const ir_state_slot
*const slots
= ir
->get_state_slots();
1179 assert(slots
!= NULL
);
1181 for (unsigned int i
= 0; i
< ir
->get_num_state_slots(); i
++) {
1182 /* This state reference has already been setup by ir_to_mesa, but we'll
1183 * get the same index back here.
1185 int index
= _mesa_add_state_reference(this->prog
->Parameters
,
1186 (gl_state_index
*)slots
[i
].tokens
);
1188 /* Add each of the unique swizzles of the element as a parameter.
1189 * This'll end up matching the expected layout of the
1190 * array/matrix/structure we're trying to fill in.
1193 for (unsigned int j
= 0; j
< 4; j
++) {
1194 int swiz
= GET_SWZ(slots
[i
].swizzle
, j
);
1195 if (swiz
== last_swiz
)
1199 stage_prog_data
->param
[uniforms
++] =
1200 &prog
->Parameters
->ParameterValues
[index
][swiz
];
1206 fs_visitor::emit_fragcoord_interpolation(bool pixel_center_integer
,
1207 bool origin_upper_left
)
1209 assert(stage
== MESA_SHADER_FRAGMENT
);
1210 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1211 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec4_type
));
1213 bool flip
= !origin_upper_left
^ key
->render_to_fbo
;
1215 /* gl_FragCoord.x */
1216 if (pixel_center_integer
) {
1217 emit(MOV(wpos
, this->pixel_x
));
1219 emit(ADD(wpos
, this->pixel_x
, fs_reg(0.5f
)));
1221 wpos
= offset(wpos
, 1);
1223 /* gl_FragCoord.y */
1224 if (!flip
&& pixel_center_integer
) {
1225 emit(MOV(wpos
, this->pixel_y
));
1227 fs_reg pixel_y
= this->pixel_y
;
1228 float offset
= (pixel_center_integer
? 0.0 : 0.5);
1231 pixel_y
.negate
= true;
1232 offset
+= key
->drawable_height
- 1.0;
1235 emit(ADD(wpos
, pixel_y
, fs_reg(offset
)));
1237 wpos
= offset(wpos
, 1);
1239 /* gl_FragCoord.z */
1240 if (brw
->gen
>= 6) {
1241 emit(MOV(wpos
, fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0))));
1243 emit(FS_OPCODE_LINTERP
, wpos
,
1244 this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
1245 this->delta_y
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
1246 interp_reg(VARYING_SLOT_POS
, 2));
1248 wpos
= offset(wpos
, 1);
1250 /* gl_FragCoord.w: Already set up in emit_interpolation */
1251 emit(BRW_OPCODE_MOV
, wpos
, this->wpos_w
);
1257 fs_visitor::emit_linterp(const fs_reg
&attr
, const fs_reg
&interp
,
1258 glsl_interp_qualifier interpolation_mode
,
1259 bool is_centroid
, bool is_sample
)
1261 brw_wm_barycentric_interp_mode barycoord_mode
;
1262 if (brw
->gen
>= 6) {
1264 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1265 barycoord_mode
= BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC
;
1267 barycoord_mode
= BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC
;
1268 } else if (is_sample
) {
1269 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1270 barycoord_mode
= BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC
;
1272 barycoord_mode
= BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC
;
1274 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1275 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1277 barycoord_mode
= BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC
;
1280 /* On Ironlake and below, there is only one interpolation mode.
1281 * Centroid interpolation doesn't mean anything on this hardware --
1282 * there is no multisampling.
1284 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1286 return emit(FS_OPCODE_LINTERP
, attr
,
1287 this->delta_x
[barycoord_mode
],
1288 this->delta_y
[barycoord_mode
], interp
);
1292 fs_visitor::emit_general_interpolation(fs_reg attr
, const char *name
,
1293 const glsl_type
*type
,
1294 glsl_interp_qualifier interpolation_mode
,
1295 int location
, bool mod_centroid
,
1298 attr
.type
= brw_type_for_base_type(type
->get_scalar_type());
1300 assert(stage
== MESA_SHADER_FRAGMENT
);
1301 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1302 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1304 unsigned int array_elements
;
1306 if (type
->is_array()) {
1307 array_elements
= type
->length
;
1308 if (array_elements
== 0) {
1309 fail("dereferenced array '%s' has length 0\n", name
);
1311 type
= type
->fields
.array
;
1316 if (interpolation_mode
== INTERP_QUALIFIER_NONE
) {
1318 location
== VARYING_SLOT_COL0
|| location
== VARYING_SLOT_COL1
;
1319 if (key
->flat_shade
&& is_gl_Color
) {
1320 interpolation_mode
= INTERP_QUALIFIER_FLAT
;
1322 interpolation_mode
= INTERP_QUALIFIER_SMOOTH
;
1326 for (unsigned int i
= 0; i
< array_elements
; i
++) {
1327 for (unsigned int j
= 0; j
< type
->matrix_columns
; j
++) {
1328 if (prog_data
->urb_setup
[location
] == -1) {
1329 /* If there's no incoming setup data for this slot, don't
1330 * emit interpolation for it.
1332 attr
= offset(attr
, type
->vector_elements
);
1337 if (interpolation_mode
== INTERP_QUALIFIER_FLAT
) {
1338 /* Constant interpolation (flat shading) case. The SF has
1339 * handed us defined values in only the constant offset
1340 * field of the setup reg.
1342 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1343 struct brw_reg interp
= interp_reg(location
, k
);
1344 interp
= suboffset(interp
, 3);
1345 interp
.type
= attr
.type
;
1346 emit(FS_OPCODE_CINTERP
, attr
, fs_reg(interp
));
1347 attr
= offset(attr
, 1);
1350 /* Smooth/noperspective interpolation case. */
1351 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1352 struct brw_reg interp
= interp_reg(location
, k
);
1353 if (brw
->needs_unlit_centroid_workaround
&& mod_centroid
) {
1354 /* Get the pixel/sample mask into f0 so that we know
1355 * which pixels are lit. Then, for each channel that is
1356 * unlit, replace the centroid data with non-centroid
1359 emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
1362 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1364 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1365 inst
->predicate_inverse
= true;
1367 inst
->no_dd_clear
= true;
1369 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1370 mod_centroid
&& !key
->persample_shading
,
1371 mod_sample
|| key
->persample_shading
);
1372 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1373 inst
->predicate_inverse
= false;
1375 inst
->no_dd_check
= true;
1378 emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1379 mod_centroid
&& !key
->persample_shading
,
1380 mod_sample
|| key
->persample_shading
);
1382 if (brw
->gen
< 6 && interpolation_mode
== INTERP_QUALIFIER_SMOOTH
) {
1383 emit(BRW_OPCODE_MUL
, attr
, attr
, this->pixel_w
);
1385 attr
= offset(attr
, 1);
1395 fs_visitor::emit_frontfacing_interpolation()
1397 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::bool_type
));
1399 if (brw
->gen
>= 6) {
1400 /* Bit 15 of g0.0 is 0 if the polygon is front facing. We want to create
1401 * a boolean result from this (~0/true or 0/false).
1403 * We can use the fact that bit 15 is the MSB of g0.0:W to accomplish
1404 * this task in only one instruction:
1405 * - a negation source modifier will flip the bit; and
1406 * - a W -> D type conversion will sign extend the bit into the high
1407 * word of the destination.
1409 * An ASR 15 fills the low word of the destination.
1411 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
1414 emit(ASR(*reg
, g0
, fs_reg(15)));
1416 /* Bit 31 of g1.6 is 0 if the polygon is front facing. We want to create
1417 * a boolean result from this (1/true or 0/false).
1419 * Like in the above case, since the bit is the MSB of g1.6:UD we can use
1420 * the negation source modifier to flip it. Unfortunately the SHR
1421 * instruction only operates on UD (or D with an abs source modifier)
1422 * sources without negation.
1424 * Instead, use ASR (which will give ~0/true or 0/false).
1426 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
1429 emit(ASR(*reg
, g1_6
, fs_reg(31)));
1436 fs_visitor::compute_sample_position(fs_reg dst
, fs_reg int_sample_pos
)
1438 assert(stage
== MESA_SHADER_FRAGMENT
);
1439 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1440 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
1442 if (key
->compute_pos_offset
) {
1443 /* Convert int_sample_pos to floating point */
1444 emit(MOV(dst
, int_sample_pos
));
1445 /* Scale to the range [0, 1] */
1446 emit(MUL(dst
, dst
, fs_reg(1 / 16.0f
)));
1449 /* From ARB_sample_shading specification:
1450 * "When rendering to a non-multisample buffer, or if multisample
1451 * rasterization is disabled, gl_SamplePosition will always be
1454 emit(MOV(dst
, fs_reg(0.5f
)));
1459 fs_visitor::emit_samplepos_setup()
1461 assert(brw
->gen
>= 6);
1463 this->current_annotation
= "compute sample position";
1464 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec2_type
));
1466 fs_reg int_sample_x
= vgrf(glsl_type::int_type
);
1467 fs_reg int_sample_y
= vgrf(glsl_type::int_type
);
1469 /* WM will be run in MSDISPMODE_PERSAMPLE. So, only one of SIMD8 or SIMD16
1470 * mode will be enabled.
1472 * From the Ivy Bridge PRM, volume 2 part 1, page 344:
1473 * R31.1:0 Position Offset X/Y for Slot[3:0]
1474 * R31.3:2 Position Offset X/Y for Slot[7:4]
1477 * The X, Y sample positions come in as bytes in thread payload. So, read
1478 * the positions using vstride=16, width=8, hstride=2.
1480 struct brw_reg sample_pos_reg
=
1481 stride(retype(brw_vec1_grf(payload
.sample_pos_reg
, 0),
1482 BRW_REGISTER_TYPE_B
), 16, 8, 2);
1484 if (dispatch_width
== 8) {
1485 emit(MOV(int_sample_x
, fs_reg(sample_pos_reg
)));
1487 emit(MOV(half(int_sample_x
, 0), fs_reg(sample_pos_reg
)));
1488 emit(MOV(half(int_sample_x
, 1), fs_reg(suboffset(sample_pos_reg
, 16))))
1489 ->force_sechalf
= true;
1491 /* Compute gl_SamplePosition.x */
1492 compute_sample_position(pos
, int_sample_x
);
1493 pos
= offset(pos
, 1);
1494 if (dispatch_width
== 8) {
1495 emit(MOV(int_sample_y
, fs_reg(suboffset(sample_pos_reg
, 1))));
1497 emit(MOV(half(int_sample_y
, 0),
1498 fs_reg(suboffset(sample_pos_reg
, 1))));
1499 emit(MOV(half(int_sample_y
, 1), fs_reg(suboffset(sample_pos_reg
, 17))))
1500 ->force_sechalf
= true;
1502 /* Compute gl_SamplePosition.y */
1503 compute_sample_position(pos
, int_sample_y
);
1508 fs_visitor::emit_sampleid_setup()
1510 assert(stage
== MESA_SHADER_FRAGMENT
);
1511 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1512 assert(brw
->gen
>= 6);
1514 this->current_annotation
= "compute sample id";
1515 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::int_type
));
1517 if (key
->compute_sample_id
) {
1518 fs_reg t1
= vgrf(glsl_type::int_type
);
1519 fs_reg t2
= vgrf(glsl_type::int_type
);
1520 t2
.type
= BRW_REGISTER_TYPE_UW
;
1522 /* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
1523 * 8x multisampling, subspan 0 will represent sample N (where N
1524 * is 0, 2, 4 or 6), subspan 1 will represent sample 1, 3, 5 or
1525 * 7. We can find the value of N by looking at R0.0 bits 7:6
1526 * ("Starting Sample Pair Index (SSPI)") and multiplying by two
1527 * (since samples are always delivered in pairs). That is, we
1528 * compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 & 0xc0) >> 5. Then
1529 * we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1) in
1530 * case of SIMD8 and sequence (0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
1531 * 2, 3, 3, 3, 3) in case of SIMD16. We compute this sequence by
1532 * populating a temporary variable with the sequence (0, 1, 2, 3),
1533 * and then reading from it using vstride=1, width=4, hstride=0.
1534 * These computations hold good for 4x multisampling as well.
1536 * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1):
1537 * the first four slots are sample 0 of subspan 0; the next four
1538 * are sample 1 of subspan 0; the third group is sample 0 of
1539 * subspan 1, and finally sample 1 of subspan 1.
1542 inst
= emit(BRW_OPCODE_AND
, t1
,
1543 fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)),
1545 inst
->force_writemask_all
= true;
1546 inst
= emit(BRW_OPCODE_SHR
, t1
, t1
, fs_reg(5));
1547 inst
->force_writemask_all
= true;
1548 /* This works for both SIMD8 and SIMD16 */
1549 inst
= emit(MOV(t2
, brw_imm_v(key
->persample_2x
? 0x1010 : 0x3210)));
1550 inst
->force_writemask_all
= true;
1551 /* This special instruction takes care of setting vstride=1,
1552 * width=4, hstride=0 of t2 during an ADD instruction.
1554 emit(FS_OPCODE_SET_SAMPLE_ID
, *reg
, t1
, t2
);
1556 /* As per GL_ARB_sample_shading specification:
1557 * "When rendering to a non-multisample buffer, or if multisample
1558 * rasterization is disabled, gl_SampleID will always be zero."
1560 emit(BRW_OPCODE_MOV
, *reg
, fs_reg(0));
1567 fs_visitor::fix_math_operand(fs_reg src
)
1569 /* Can't do hstride == 0 args on gen6 math, so expand it out. We
1570 * might be able to do better by doing execsize = 1 math and then
1571 * expanding that result out, but we would need to be careful with
1574 * The hardware ignores source modifiers (negate and abs) on math
1575 * instructions, so we also move to a temp to set those up.
1577 if (brw
->gen
== 6 && src
.file
!= UNIFORM
&& src
.file
!= IMM
&&
1578 !src
.abs
&& !src
.negate
)
1581 /* Gen7 relaxes most of the above restrictions, but still can't use IMM
1584 if (brw
->gen
>= 7 && src
.file
!= IMM
)
1587 fs_reg expanded
= vgrf(glsl_type::float_type
);
1588 expanded
.type
= src
.type
;
1589 emit(BRW_OPCODE_MOV
, expanded
, src
);
1594 fs_visitor::emit_math(enum opcode opcode
, fs_reg dst
, fs_reg src
)
1597 case SHADER_OPCODE_RCP
:
1598 case SHADER_OPCODE_RSQ
:
1599 case SHADER_OPCODE_SQRT
:
1600 case SHADER_OPCODE_EXP2
:
1601 case SHADER_OPCODE_LOG2
:
1602 case SHADER_OPCODE_SIN
:
1603 case SHADER_OPCODE_COS
:
1606 unreachable("not reached: bad math opcode");
1609 /* Can't do hstride == 0 args to gen6 math, so expand it out. We
1610 * might be able to do better by doing execsize = 1 math and then
1611 * expanding that result out, but we would need to be careful with
1614 * Gen 6 hardware ignores source modifiers (negate and abs) on math
1615 * instructions, so we also move to a temp to set those up.
1617 if (brw
->gen
== 6 || brw
->gen
== 7)
1618 src
= fix_math_operand(src
);
1620 fs_inst
*inst
= emit(opcode
, dst
, src
);
1624 inst
->mlen
= dispatch_width
/ 8;
1631 fs_visitor::emit_math(enum opcode opcode
, fs_reg dst
, fs_reg src0
, fs_reg src1
)
1636 if (brw
->gen
>= 8) {
1637 inst
= emit(opcode
, dst
, src0
, src1
);
1638 } else if (brw
->gen
>= 6) {
1639 src0
= fix_math_operand(src0
);
1640 src1
= fix_math_operand(src1
);
1642 inst
= emit(opcode
, dst
, src0
, src1
);
1644 /* From the Ironlake PRM, Volume 4, Part 1, Section 6.1.13
1645 * "Message Payload":
1647 * "Operand0[7]. For the INT DIV functions, this operand is the
1650 * "Operand1[7]. For the INT DIV functions, this operand is the
1653 bool is_int_div
= opcode
!= SHADER_OPCODE_POW
;
1654 fs_reg
&op0
= is_int_div
? src1
: src0
;
1655 fs_reg
&op1
= is_int_div
? src0
: src1
;
1657 emit(MOV(fs_reg(MRF
, base_mrf
+ 1, op1
.type
, dispatch_width
), op1
));
1658 inst
= emit(opcode
, dst
, op0
, reg_null_f
);
1660 inst
->base_mrf
= base_mrf
;
1661 inst
->mlen
= 2 * dispatch_width
/ 8;
1667 fs_visitor::assign_curb_setup()
1669 if (dispatch_width
== 8) {
1670 prog_data
->dispatch_grf_start_reg
= payload
.num_regs
;
1672 assert(stage
== MESA_SHADER_FRAGMENT
);
1673 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1674 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1677 prog_data
->curb_read_length
= ALIGN(stage_prog_data
->nr_params
, 8) / 8;
1679 /* Map the offsets in the UNIFORM file to fixed HW regs. */
1680 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1681 for (unsigned int i
= 0; i
< inst
->sources
; i
++) {
1682 if (inst
->src
[i
].file
== UNIFORM
) {
1683 int uniform_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
1685 if (uniform_nr
>= 0 && uniform_nr
< (int) uniforms
) {
1686 constant_nr
= push_constant_loc
[uniform_nr
];
1688 /* Section 5.11 of the OpenGL 4.1 spec says:
1689 * "Out-of-bounds reads return undefined values, which include
1690 * values from other variables of the active program or zero."
1691 * Just return the first push constant.
1696 struct brw_reg brw_reg
= brw_vec1_grf(payload
.num_regs
+
1700 inst
->src
[i
].file
= HW_REG
;
1701 inst
->src
[i
].fixed_hw_reg
= byte_offset(
1702 retype(brw_reg
, inst
->src
[i
].type
),
1703 inst
->src
[i
].subreg_offset
);
1710 fs_visitor::calculate_urb_setup()
1712 assert(stage
== MESA_SHADER_FRAGMENT
);
1713 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1714 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1716 memset(prog_data
->urb_setup
, -1,
1717 sizeof(prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
1720 /* Figure out where each of the incoming setup attributes lands. */
1721 if (brw
->gen
>= 6) {
1722 if (_mesa_bitcount_64(prog
->InputsRead
&
1723 BRW_FS_VARYING_INPUT_MASK
) <= 16) {
1724 /* The SF/SBE pipeline stage can do arbitrary rearrangement of the
1725 * first 16 varying inputs, so we can put them wherever we want.
1726 * Just put them in order.
1728 * This is useful because it means that (a) inputs not used by the
1729 * fragment shader won't take up valuable register space, and (b) we
1730 * won't have to recompile the fragment shader if it gets paired with
1731 * a different vertex (or geometry) shader.
1733 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1734 if (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1735 BITFIELD64_BIT(i
)) {
1736 prog_data
->urb_setup
[i
] = urb_next
++;
1740 /* We have enough input varyings that the SF/SBE pipeline stage can't
1741 * arbitrarily rearrange them to suit our whim; we have to put them
1742 * in an order that matches the output of the previous pipeline stage
1743 * (geometry or vertex shader).
1745 struct brw_vue_map prev_stage_vue_map
;
1746 brw_compute_vue_map(brw
, &prev_stage_vue_map
,
1747 key
->input_slots_valid
);
1748 int first_slot
= 2 * BRW_SF_URB_ENTRY_READ_OFFSET
;
1749 assert(prev_stage_vue_map
.num_slots
<= first_slot
+ 32);
1750 for (int slot
= first_slot
; slot
< prev_stage_vue_map
.num_slots
;
1752 int varying
= prev_stage_vue_map
.slot_to_varying
[slot
];
1753 /* Note that varying == BRW_VARYING_SLOT_COUNT when a slot is
1756 if (varying
!= BRW_VARYING_SLOT_COUNT
&&
1757 (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1758 BITFIELD64_BIT(varying
))) {
1759 prog_data
->urb_setup
[varying
] = slot
- first_slot
;
1762 urb_next
= prev_stage_vue_map
.num_slots
- first_slot
;
1765 /* FINISHME: The sf doesn't map VS->FS inputs for us very well. */
1766 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1767 /* Point size is packed into the header, not as a general attribute */
1768 if (i
== VARYING_SLOT_PSIZ
)
1771 if (key
->input_slots_valid
& BITFIELD64_BIT(i
)) {
1772 /* The back color slot is skipped when the front color is
1773 * also written to. In addition, some slots can be
1774 * written in the vertex shader and not read in the
1775 * fragment shader. So the register number must always be
1776 * incremented, mapped or not.
1778 if (_mesa_varying_slot_in_fs((gl_varying_slot
) i
))
1779 prog_data
->urb_setup
[i
] = urb_next
;
1785 * It's a FS only attribute, and we did interpolation for this attribute
1786 * in SF thread. So, count it here, too.
1788 * See compile_sf_prog() for more info.
1790 if (prog
->InputsRead
& BITFIELD64_BIT(VARYING_SLOT_PNTC
))
1791 prog_data
->urb_setup
[VARYING_SLOT_PNTC
] = urb_next
++;
1794 prog_data
->num_varying_inputs
= urb_next
;
1798 fs_visitor::assign_urb_setup()
1800 assert(stage
== MESA_SHADER_FRAGMENT
);
1801 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1803 int urb_start
= payload
.num_regs
+ prog_data
->base
.curb_read_length
;
1805 /* Offset all the urb_setup[] index by the actual position of the
1806 * setup regs, now that the location of the constants has been chosen.
1808 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1809 if (inst
->opcode
== FS_OPCODE_LINTERP
) {
1810 assert(inst
->src
[2].file
== HW_REG
);
1811 inst
->src
[2].fixed_hw_reg
.nr
+= urb_start
;
1814 if (inst
->opcode
== FS_OPCODE_CINTERP
) {
1815 assert(inst
->src
[0].file
== HW_REG
);
1816 inst
->src
[0].fixed_hw_reg
.nr
+= urb_start
;
1820 /* Each attribute is 4 setup channels, each of which is half a reg. */
1821 this->first_non_payload_grf
=
1822 urb_start
+ prog_data
->num_varying_inputs
* 2;
1826 fs_visitor::assign_vs_urb_setup()
1828 brw_vs_prog_data
*vs_prog_data
= (brw_vs_prog_data
*) prog_data
;
1829 int grf
, count
, slot
, channel
, attr
;
1831 assert(stage
== MESA_SHADER_VERTEX
);
1832 count
= _mesa_bitcount_64(vs_prog_data
->inputs_read
);
1833 if (vs_prog_data
->uses_vertexid
|| vs_prog_data
->uses_instanceid
)
1836 /* Each attribute is 4 regs. */
1837 this->first_non_payload_grf
=
1838 payload
.num_regs
+ prog_data
->curb_read_length
+ count
* 4;
1840 unsigned vue_entries
=
1841 MAX2(count
, vs_prog_data
->base
.vue_map
.num_slots
);
1843 vs_prog_data
->base
.urb_entry_size
= ALIGN(vue_entries
, 4) / 4;
1844 vs_prog_data
->base
.urb_read_length
= (count
+ 1) / 2;
1846 assert(vs_prog_data
->base
.urb_read_length
<= 15);
1848 /* Rewrite all ATTR file references to the hw grf that they land in. */
1849 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1850 for (int i
= 0; i
< inst
->sources
; i
++) {
1851 if (inst
->src
[i
].file
== ATTR
) {
1853 if (inst
->src
[i
].reg
== VERT_ATTRIB_MAX
) {
1856 /* Attributes come in in a contiguous block, ordered by their
1857 * gl_vert_attrib value. That means we can compute the slot
1858 * number for an attribute by masking out the enabled
1859 * attributes before it and counting the bits.
1861 attr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
/ 4;
1862 slot
= _mesa_bitcount_64(vs_prog_data
->inputs_read
&
1863 BITFIELD64_MASK(attr
));
1866 channel
= inst
->src
[i
].reg_offset
& 3;
1868 grf
= payload
.num_regs
+
1869 prog_data
->curb_read_length
+
1872 inst
->src
[i
].file
= HW_REG
;
1873 inst
->src
[i
].fixed_hw_reg
=
1874 retype(brw_vec8_grf(grf
, 0), inst
->src
[i
].type
);
1881 * Split large virtual GRFs into separate components if we can.
1883 * This is mostly duplicated with what brw_fs_vector_splitting does,
1884 * but that's really conservative because it's afraid of doing
1885 * splitting that doesn't result in real progress after the rest of
1886 * the optimization phases, which would cause infinite looping in
1887 * optimization. We can do it once here, safely. This also has the
1888 * opportunity to split interpolated values, or maybe even uniforms,
1889 * which we don't have at the IR level.
1891 * We want to split, because virtual GRFs are what we register
1892 * allocate and spill (due to contiguousness requirements for some
1893 * instructions), and they're what we naturally generate in the
1894 * codegen process, but most virtual GRFs don't actually need to be
1895 * contiguous sets of GRFs. If we split, we'll end up with reduced
1896 * live intervals and better dead code elimination and coalescing.
1899 fs_visitor::split_virtual_grfs()
1901 int num_vars
= this->alloc
.count
;
1903 /* Count the total number of registers */
1905 int vgrf_to_reg
[num_vars
];
1906 for (int i
= 0; i
< num_vars
; i
++) {
1907 vgrf_to_reg
[i
] = reg_count
;
1908 reg_count
+= alloc
.sizes
[i
];
1911 /* An array of "split points". For each register slot, this indicates
1912 * if this slot can be separated from the previous slot. Every time an
1913 * instruction uses multiple elements of a register (as a source or
1914 * destination), we mark the used slots as inseparable. Then we go
1915 * through and split the registers into the smallest pieces we can.
1917 bool split_points
[reg_count
];
1918 memset(split_points
, 0, sizeof(split_points
));
1920 /* Mark all used registers as fully splittable */
1921 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1922 if (inst
->dst
.file
== GRF
) {
1923 int reg
= vgrf_to_reg
[inst
->dst
.reg
];
1924 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->dst
.reg
]; j
++)
1925 split_points
[reg
+ j
] = true;
1928 for (int i
= 0; i
< inst
->sources
; i
++) {
1929 if (inst
->src
[i
].file
== GRF
) {
1930 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
];
1931 for (unsigned j
= 1; j
< this->alloc
.sizes
[inst
->src
[i
].reg
]; j
++)
1932 split_points
[reg
+ j
] = true;
1938 this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
].file
== GRF
) {
1939 /* PLN opcodes rely on the delta_xy being contiguous. We only have to
1940 * check this for BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC, because prior to
1941 * Gen6, that was the only supported interpolation mode, and since Gen6,
1942 * delta_x and delta_y are in fixed hardware registers.
1944 int vgrf
= this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
].reg
;
1945 split_points
[vgrf_to_reg
[vgrf
] + 1] = false;
1948 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1949 if (inst
->dst
.file
== GRF
) {
1950 int reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
1951 for (int j
= 1; j
< inst
->regs_written
; j
++)
1952 split_points
[reg
+ j
] = false;
1954 for (int i
= 0; i
< inst
->sources
; i
++) {
1955 if (inst
->src
[i
].file
== GRF
) {
1956 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
1957 for (int j
= 1; j
< inst
->regs_read(i
); j
++)
1958 split_points
[reg
+ j
] = false;
1963 int new_virtual_grf
[reg_count
];
1964 int new_reg_offset
[reg_count
];
1967 for (int i
= 0; i
< num_vars
; i
++) {
1968 /* The first one should always be 0 as a quick sanity check. */
1969 assert(split_points
[reg
] == false);
1972 new_reg_offset
[reg
] = 0;
1977 for (unsigned j
= 1; j
< alloc
.sizes
[i
]; j
++) {
1978 /* If this is a split point, reset the offset to 0 and allocate a
1979 * new virtual GRF for the previous offset many registers
1981 if (split_points
[reg
]) {
1982 assert(offset
<= MAX_VGRF_SIZE
);
1983 int grf
= alloc
.allocate(offset
);
1984 for (int k
= reg
- offset
; k
< reg
; k
++)
1985 new_virtual_grf
[k
] = grf
;
1988 new_reg_offset
[reg
] = offset
;
1993 /* The last one gets the original register number */
1994 assert(offset
<= MAX_VGRF_SIZE
);
1995 alloc
.sizes
[i
] = offset
;
1996 for (int k
= reg
- offset
; k
< reg
; k
++)
1997 new_virtual_grf
[k
] = i
;
1999 assert(reg
== reg_count
);
2001 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2002 if (inst
->dst
.file
== GRF
) {
2003 reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
2004 inst
->dst
.reg
= new_virtual_grf
[reg
];
2005 inst
->dst
.reg_offset
= new_reg_offset
[reg
];
2006 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
2008 for (int i
= 0; i
< inst
->sources
; i
++) {
2009 if (inst
->src
[i
].file
== GRF
) {
2010 reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
2011 inst
->src
[i
].reg
= new_virtual_grf
[reg
];
2012 inst
->src
[i
].reg_offset
= new_reg_offset
[reg
];
2013 assert((unsigned)new_reg_offset
[reg
] < alloc
.sizes
[new_virtual_grf
[reg
]]);
2017 invalidate_live_intervals();
2021 * Remove unused virtual GRFs and compact the virtual_grf_* arrays.
2023 * During code generation, we create tons of temporary variables, many of
2024 * which get immediately killed and are never used again. Yet, in later
2025 * optimization and analysis passes, such as compute_live_intervals, we need
2026 * to loop over all the virtual GRFs. Compacting them can save a lot of
2030 fs_visitor::compact_virtual_grfs()
2032 bool progress
= false;
2033 int remap_table
[this->alloc
.count
];
2034 memset(remap_table
, -1, sizeof(remap_table
));
2036 /* Mark which virtual GRFs are used. */
2037 foreach_block_and_inst(block
, const fs_inst
, inst
, cfg
) {
2038 if (inst
->dst
.file
== GRF
)
2039 remap_table
[inst
->dst
.reg
] = 0;
2041 for (int i
= 0; i
< inst
->sources
; i
++) {
2042 if (inst
->src
[i
].file
== GRF
)
2043 remap_table
[inst
->src
[i
].reg
] = 0;
2047 /* Compact the GRF arrays. */
2049 for (unsigned i
= 0; i
< this->alloc
.count
; i
++) {
2050 if (remap_table
[i
] == -1) {
2051 /* We just found an unused register. This means that we are
2052 * actually going to compact something.
2056 remap_table
[i
] = new_index
;
2057 alloc
.sizes
[new_index
] = alloc
.sizes
[i
];
2058 invalidate_live_intervals();
2063 this->alloc
.count
= new_index
;
2065 /* Patch all the instructions to use the newly renumbered registers */
2066 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2067 if (inst
->dst
.file
== GRF
)
2068 inst
->dst
.reg
= remap_table
[inst
->dst
.reg
];
2070 for (int i
= 0; i
< inst
->sources
; i
++) {
2071 if (inst
->src
[i
].file
== GRF
)
2072 inst
->src
[i
].reg
= remap_table
[inst
->src
[i
].reg
];
2076 /* Patch all the references to delta_x/delta_y, since they're used in
2077 * register allocation. If they're unused, switch them to BAD_FILE so
2078 * we don't think some random VGRF is delta_x/delta_y.
2080 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_x
); i
++) {
2081 if (delta_x
[i
].file
== GRF
) {
2082 if (remap_table
[delta_x
[i
].reg
] != -1) {
2083 delta_x
[i
].reg
= remap_table
[delta_x
[i
].reg
];
2085 delta_x
[i
].file
= BAD_FILE
;
2089 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_y
); i
++) {
2090 if (delta_y
[i
].file
== GRF
) {
2091 if (remap_table
[delta_y
[i
].reg
] != -1) {
2092 delta_y
[i
].reg
= remap_table
[delta_y
[i
].reg
];
2094 delta_y
[i
].file
= BAD_FILE
;
2103 * Implements array access of uniforms by inserting a
2104 * PULL_CONSTANT_LOAD instruction.
2106 * Unlike temporary GRF array access (where we don't support it due to
2107 * the difficulty of doing relative addressing on instruction
2108 * destinations), we could potentially do array access of uniforms
2109 * that were loaded in GRF space as push constants. In real-world
2110 * usage we've seen, though, the arrays being used are always larger
2111 * than we could load as push constants, so just always move all
2112 * uniform array access out to a pull constant buffer.
2115 fs_visitor::move_uniform_array_access_to_pull_constants()
2117 if (dispatch_width
!= 8)
2120 pull_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2121 memset(pull_constant_loc
, -1, sizeof(pull_constant_loc
[0]) * uniforms
);
2123 /* Walk through and find array access of uniforms. Put a copy of that
2124 * uniform in the pull constant buffer.
2126 * Note that we don't move constant-indexed accesses to arrays. No
2127 * testing has been done of the performance impact of this choice.
2129 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2130 for (int i
= 0 ; i
< inst
->sources
; i
++) {
2131 if (inst
->src
[i
].file
!= UNIFORM
|| !inst
->src
[i
].reladdr
)
2134 int uniform
= inst
->src
[i
].reg
;
2136 /* If this array isn't already present in the pull constant buffer,
2139 if (pull_constant_loc
[uniform
] == -1) {
2140 const gl_constant_value
**values
= &stage_prog_data
->param
[uniform
];
2142 assert(param_size
[uniform
]);
2144 for (int j
= 0; j
< param_size
[uniform
]; j
++) {
2145 pull_constant_loc
[uniform
+ j
] = stage_prog_data
->nr_pull_params
;
2147 stage_prog_data
->pull_param
[stage_prog_data
->nr_pull_params
++] =
2156 * Assign UNIFORM file registers to either push constants or pull constants.
2158 * We allow a fragment shader to have more than the specified minimum
2159 * maximum number of fragment shader uniform components (64). If
2160 * there are too many of these, they'd fill up all of register space.
2161 * So, this will push some of them out to the pull constant buffer and
2162 * update the program to load them.
2165 fs_visitor::assign_constant_locations()
2167 /* Only the first compile (SIMD8 mode) gets to decide on locations. */
2168 if (dispatch_width
!= 8)
2171 /* Find which UNIFORM registers are still in use. */
2172 bool is_live
[uniforms
];
2173 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2177 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2178 for (int i
= 0; i
< inst
->sources
; i
++) {
2179 if (inst
->src
[i
].file
!= UNIFORM
)
2182 int constant_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
2183 if (constant_nr
>= 0 && constant_nr
< (int) uniforms
)
2184 is_live
[constant_nr
] = true;
2188 /* Only allow 16 registers (128 uniform components) as push constants.
2190 * Just demote the end of the list. We could probably do better
2191 * here, demoting things that are rarely used in the program first.
2193 * If changing this value, note the limitation about total_regs in
2196 unsigned int max_push_components
= 16 * 8;
2197 unsigned int num_push_constants
= 0;
2199 push_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2201 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2202 if (!is_live
[i
] || pull_constant_loc
[i
] != -1) {
2203 /* This UNIFORM register is either dead, or has already been demoted
2204 * to a pull const. Mark it as no longer living in the param[] array.
2206 push_constant_loc
[i
] = -1;
2210 if (num_push_constants
< max_push_components
) {
2211 /* Retain as a push constant. Record the location in the params[]
2214 push_constant_loc
[i
] = num_push_constants
++;
2216 /* Demote to a pull constant. */
2217 push_constant_loc
[i
] = -1;
2219 int pull_index
= stage_prog_data
->nr_pull_params
++;
2220 stage_prog_data
->pull_param
[pull_index
] = stage_prog_data
->param
[i
];
2221 pull_constant_loc
[i
] = pull_index
;
2225 stage_prog_data
->nr_params
= num_push_constants
;
2227 /* Up until now, the param[] array has been indexed by reg + reg_offset
2228 * of UNIFORM registers. Condense it to only contain the uniforms we
2229 * chose to upload as push constants.
2231 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2232 int remapped
= push_constant_loc
[i
];
2237 assert(remapped
<= (int)i
);
2238 stage_prog_data
->param
[remapped
] = stage_prog_data
->param
[i
];
2243 * Replace UNIFORM register file access with either UNIFORM_PULL_CONSTANT_LOAD
2244 * or VARYING_PULL_CONSTANT_LOAD instructions which load values into VGRFs.
2247 fs_visitor::demote_pull_constants()
2249 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
2250 for (int i
= 0; i
< inst
->sources
; i
++) {
2251 if (inst
->src
[i
].file
!= UNIFORM
)
2254 int pull_index
= pull_constant_loc
[inst
->src
[i
].reg
+
2255 inst
->src
[i
].reg_offset
];
2256 if (pull_index
== -1)
2259 /* Set up the annotation tracking for new generated instructions. */
2261 current_annotation
= inst
->annotation
;
2263 fs_reg
surf_index(stage_prog_data
->binding_table
.pull_constants_start
);
2264 fs_reg dst
= vgrf(glsl_type::float_type
);
2266 /* Generate a pull load into dst. */
2267 if (inst
->src
[i
].reladdr
) {
2268 exec_list list
= VARYING_PULL_CONSTANT_LOAD(dst
,
2270 *inst
->src
[i
].reladdr
,
2272 inst
->insert_before(block
, &list
);
2273 inst
->src
[i
].reladdr
= NULL
;
2275 fs_reg offset
= fs_reg((unsigned)(pull_index
* 4) & ~15);
2277 new(mem_ctx
) fs_inst(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
, 8,
2278 dst
, surf_index
, offset
);
2279 inst
->insert_before(block
, pull
);
2280 inst
->src
[i
].set_smear(pull_index
& 3);
2283 /* Rewrite the instruction to use the temporary VGRF. */
2284 inst
->src
[i
].file
= GRF
;
2285 inst
->src
[i
].reg
= dst
.reg
;
2286 inst
->src
[i
].reg_offset
= 0;
2287 inst
->src
[i
].width
= dispatch_width
;
2290 invalidate_live_intervals();
2294 fs_visitor::opt_algebraic()
2296 bool progress
= false;
2298 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2299 switch (inst
->opcode
) {
2300 case BRW_OPCODE_MOV
:
2301 if (inst
->src
[0].file
!= IMM
)
2304 if (inst
->saturate
) {
2305 if (inst
->dst
.type
!= inst
->src
[0].type
)
2306 assert(!"unimplemented: saturate mixed types");
2308 if (brw_saturate_immediate(inst
->dst
.type
,
2309 &inst
->src
[0].fixed_hw_reg
)) {
2310 inst
->saturate
= false;
2316 case BRW_OPCODE_MUL
:
2317 if (inst
->src
[1].file
!= IMM
)
2321 if (inst
->src
[1].is_one()) {
2322 inst
->opcode
= BRW_OPCODE_MOV
;
2323 inst
->src
[1] = reg_undef
;
2329 if (inst
->src
[1].is_zero()) {
2330 inst
->opcode
= BRW_OPCODE_MOV
;
2331 inst
->src
[0] = inst
->src
[1];
2332 inst
->src
[1] = reg_undef
;
2338 case BRW_OPCODE_ADD
:
2339 if (inst
->src
[1].file
!= IMM
)
2343 if (inst
->src
[1].is_zero()) {
2344 inst
->opcode
= BRW_OPCODE_MOV
;
2345 inst
->src
[1] = reg_undef
;
2351 if (inst
->src
[0].equals(inst
->src
[1])) {
2352 inst
->opcode
= BRW_OPCODE_MOV
;
2353 inst
->src
[1] = reg_undef
;
2358 case BRW_OPCODE_LRP
:
2359 if (inst
->src
[1].equals(inst
->src
[2])) {
2360 inst
->opcode
= BRW_OPCODE_MOV
;
2361 inst
->src
[0] = inst
->src
[1];
2362 inst
->src
[1] = reg_undef
;
2363 inst
->src
[2] = reg_undef
;
2368 case BRW_OPCODE_CMP
:
2369 if (inst
->conditional_mod
== BRW_CONDITIONAL_GE
&&
2371 inst
->src
[0].negate
&&
2372 inst
->src
[1].is_zero()) {
2373 inst
->src
[0].abs
= false;
2374 inst
->src
[0].negate
= false;
2375 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2380 case BRW_OPCODE_SEL
:
2381 if (inst
->src
[0].equals(inst
->src
[1])) {
2382 inst
->opcode
= BRW_OPCODE_MOV
;
2383 inst
->src
[1] = reg_undef
;
2384 inst
->predicate
= BRW_PREDICATE_NONE
;
2385 inst
->predicate_inverse
= false;
2387 } else if (inst
->saturate
&& inst
->src
[1].file
== IMM
) {
2388 switch (inst
->conditional_mod
) {
2389 case BRW_CONDITIONAL_LE
:
2390 case BRW_CONDITIONAL_L
:
2391 switch (inst
->src
[1].type
) {
2392 case BRW_REGISTER_TYPE_F
:
2393 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
>= 1.0f
) {
2394 inst
->opcode
= BRW_OPCODE_MOV
;
2395 inst
->src
[1] = reg_undef
;
2396 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2404 case BRW_CONDITIONAL_GE
:
2405 case BRW_CONDITIONAL_G
:
2406 switch (inst
->src
[1].type
) {
2407 case BRW_REGISTER_TYPE_F
:
2408 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
<= 0.0f
) {
2409 inst
->opcode
= BRW_OPCODE_MOV
;
2410 inst
->src
[1] = reg_undef
;
2411 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2423 case SHADER_OPCODE_RCP
: {
2424 fs_inst
*prev
= (fs_inst
*)inst
->prev
;
2425 if (prev
->opcode
== SHADER_OPCODE_SQRT
) {
2426 if (inst
->src
[0].equals(prev
->dst
)) {
2427 inst
->opcode
= SHADER_OPCODE_RSQ
;
2428 inst
->src
[0] = prev
->src
[0];
2443 fs_visitor::opt_register_renaming()
2445 bool progress
= false;
2448 int remap
[alloc
.count
];
2449 memset(remap
, -1, sizeof(int) * alloc
.count
);
2451 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2452 if (inst
->opcode
== BRW_OPCODE_IF
|| inst
->opcode
== BRW_OPCODE_DO
) {
2454 } else if (inst
->opcode
== BRW_OPCODE_ENDIF
||
2455 inst
->opcode
== BRW_OPCODE_WHILE
) {
2459 /* Rewrite instruction sources. */
2460 for (int i
= 0; i
< inst
->sources
; i
++) {
2461 if (inst
->src
[i
].file
== GRF
&&
2462 remap
[inst
->src
[i
].reg
] != -1 &&
2463 remap
[inst
->src
[i
].reg
] != inst
->src
[i
].reg
) {
2464 inst
->src
[i
].reg
= remap
[inst
->src
[i
].reg
];
2469 const int dst
= inst
->dst
.reg
;
2472 inst
->dst
.file
== GRF
&&
2473 alloc
.sizes
[inst
->dst
.reg
] == inst
->dst
.width
/ 8 &&
2474 !inst
->is_partial_write()) {
2475 if (remap
[dst
] == -1) {
2478 remap
[dst
] = alloc
.allocate(inst
->dst
.width
/ 8);
2479 inst
->dst
.reg
= remap
[dst
];
2482 } else if (inst
->dst
.file
== GRF
&&
2484 remap
[dst
] != dst
) {
2485 inst
->dst
.reg
= remap
[dst
];
2491 invalidate_live_intervals();
2493 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_x
); i
++) {
2494 if (delta_x
[i
].file
== GRF
&& remap
[delta_x
[i
].reg
] != -1) {
2495 delta_x
[i
].reg
= remap
[delta_x
[i
].reg
];
2498 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_y
); i
++) {
2499 if (delta_y
[i
].file
== GRF
&& remap
[delta_y
[i
].reg
] != -1) {
2500 delta_y
[i
].reg
= remap
[delta_y
[i
].reg
];
2509 fs_visitor::compute_to_mrf()
2511 bool progress
= false;
2514 /* No MRFs on Gen >= 7. */
2518 calculate_live_intervals();
2520 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2524 if (inst
->opcode
!= BRW_OPCODE_MOV
||
2525 inst
->is_partial_write() ||
2526 inst
->dst
.file
!= MRF
|| inst
->src
[0].file
!= GRF
||
2527 inst
->dst
.type
!= inst
->src
[0].type
||
2528 inst
->src
[0].abs
|| inst
->src
[0].negate
||
2529 !inst
->src
[0].is_contiguous() ||
2530 inst
->src
[0].subreg_offset
)
2533 /* Work out which hardware MRF registers are written by this
2536 int mrf_low
= inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2538 if (inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2539 mrf_high
= mrf_low
+ 4;
2540 } else if (inst
->exec_size
== 16) {
2541 mrf_high
= mrf_low
+ 1;
2546 /* Can't compute-to-MRF this GRF if someone else was going to
2549 if (this->virtual_grf_end
[inst
->src
[0].reg
] > ip
)
2552 /* Found a move of a GRF to a MRF. Let's see if we can go
2553 * rewrite the thing that made this GRF to write into the MRF.
2555 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2556 if (scan_inst
->dst
.file
== GRF
&&
2557 scan_inst
->dst
.reg
== inst
->src
[0].reg
) {
2558 /* Found the last thing to write our reg we want to turn
2559 * into a compute-to-MRF.
2562 /* If this one instruction didn't populate all the
2563 * channels, bail. We might be able to rewrite everything
2564 * that writes that reg, but it would require smarter
2565 * tracking to delay the rewriting until complete success.
2567 if (scan_inst
->is_partial_write())
2570 /* Things returning more than one register would need us to
2571 * understand coalescing out more than one MOV at a time.
2573 if (scan_inst
->regs_written
> scan_inst
->dst
.width
/ 8)
2576 /* SEND instructions can't have MRF as a destination. */
2577 if (scan_inst
->mlen
)
2580 if (brw
->gen
== 6) {
2581 /* gen6 math instructions must have the destination be
2582 * GRF, so no compute-to-MRF for them.
2584 if (scan_inst
->is_math()) {
2589 if (scan_inst
->dst
.reg_offset
== inst
->src
[0].reg_offset
) {
2590 /* Found the creator of our MRF's source value. */
2591 scan_inst
->dst
.file
= MRF
;
2592 scan_inst
->dst
.reg
= inst
->dst
.reg
;
2593 scan_inst
->saturate
|= inst
->saturate
;
2594 inst
->remove(block
);
2600 /* We don't handle control flow here. Most computation of
2601 * values that end up in MRFs are shortly before the MRF
2604 if (block
->start() == scan_inst
)
2607 /* You can't read from an MRF, so if someone else reads our
2608 * MRF's source GRF that we wanted to rewrite, that stops us.
2610 bool interfered
= false;
2611 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
2612 if (scan_inst
->src
[i
].file
== GRF
&&
2613 scan_inst
->src
[i
].reg
== inst
->src
[0].reg
&&
2614 scan_inst
->src
[i
].reg_offset
== inst
->src
[0].reg_offset
) {
2621 if (scan_inst
->dst
.file
== MRF
) {
2622 /* If somebody else writes our MRF here, we can't
2623 * compute-to-MRF before that.
2625 int scan_mrf_low
= scan_inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2628 if (scan_inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2629 scan_mrf_high
= scan_mrf_low
+ 4;
2630 } else if (scan_inst
->exec_size
== 16) {
2631 scan_mrf_high
= scan_mrf_low
+ 1;
2633 scan_mrf_high
= scan_mrf_low
;
2636 if (mrf_low
== scan_mrf_low
||
2637 mrf_low
== scan_mrf_high
||
2638 mrf_high
== scan_mrf_low
||
2639 mrf_high
== scan_mrf_high
) {
2644 if (scan_inst
->mlen
> 0 && scan_inst
->base_mrf
!= -1) {
2645 /* Found a SEND instruction, which means that there are
2646 * live values in MRFs from base_mrf to base_mrf +
2647 * scan_inst->mlen - 1. Don't go pushing our MRF write up
2650 if (mrf_low
>= scan_inst
->base_mrf
&&
2651 mrf_low
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2654 if (mrf_high
>= scan_inst
->base_mrf
&&
2655 mrf_high
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2663 invalidate_live_intervals();
2669 * Once we've generated code, try to convert normal FS_OPCODE_FB_WRITE
2670 * instructions to FS_OPCODE_REP_FB_WRITE.
2673 fs_visitor::emit_repclear_shader()
2675 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2677 int color_mrf
= base_mrf
+ 2;
2679 fs_inst
*mov
= emit(MOV(vec4(brw_message_reg(color_mrf
)),
2680 fs_reg(UNIFORM
, 0, BRW_REGISTER_TYPE_F
)));
2681 mov
->force_writemask_all
= true;
2684 if (key
->nr_color_regions
== 1) {
2685 write
= emit(FS_OPCODE_REP_FB_WRITE
);
2686 write
->saturate
= key
->clamp_fragment_color
;
2687 write
->base_mrf
= color_mrf
;
2689 write
->header_present
= false;
2692 assume(key
->nr_color_regions
> 0);
2693 for (int i
= 0; i
< key
->nr_color_regions
; ++i
) {
2694 write
= emit(FS_OPCODE_REP_FB_WRITE
);
2695 write
->saturate
= key
->clamp_fragment_color
;
2696 write
->base_mrf
= base_mrf
;
2698 write
->header_present
= true;
2706 assign_constant_locations();
2707 assign_curb_setup();
2709 /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
2710 assert(mov
->src
[0].file
== HW_REG
);
2711 mov
->src
[0] = brw_vec4_grf(mov
->src
[0].fixed_hw_reg
.nr
, 0);
2715 * Walks through basic blocks, looking for repeated MRF writes and
2716 * removing the later ones.
2719 fs_visitor::remove_duplicate_mrf_writes()
2721 fs_inst
*last_mrf_move
[16];
2722 bool progress
= false;
2724 /* Need to update the MRF tracking for compressed instructions. */
2725 if (dispatch_width
== 16)
2728 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2730 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2731 if (inst
->is_control_flow()) {
2732 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2735 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2736 inst
->dst
.file
== MRF
) {
2737 fs_inst
*prev_inst
= last_mrf_move
[inst
->dst
.reg
];
2738 if (prev_inst
&& inst
->equals(prev_inst
)) {
2739 inst
->remove(block
);
2745 /* Clear out the last-write records for MRFs that were overwritten. */
2746 if (inst
->dst
.file
== MRF
) {
2747 last_mrf_move
[inst
->dst
.reg
] = NULL
;
2750 if (inst
->mlen
> 0 && inst
->base_mrf
!= -1) {
2751 /* Found a SEND instruction, which will include two or fewer
2752 * implied MRF writes. We could do better here.
2754 for (int i
= 0; i
< implied_mrf_writes(inst
); i
++) {
2755 last_mrf_move
[inst
->base_mrf
+ i
] = NULL
;
2759 /* Clear out any MRF move records whose sources got overwritten. */
2760 if (inst
->dst
.file
== GRF
) {
2761 for (unsigned int i
= 0; i
< Elements(last_mrf_move
); i
++) {
2762 if (last_mrf_move
[i
] &&
2763 last_mrf_move
[i
]->src
[0].reg
== inst
->dst
.reg
) {
2764 last_mrf_move
[i
] = NULL
;
2769 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2770 inst
->dst
.file
== MRF
&&
2771 inst
->src
[0].file
== GRF
&&
2772 !inst
->is_partial_write()) {
2773 last_mrf_move
[inst
->dst
.reg
] = inst
;
2778 invalidate_live_intervals();
2784 clear_deps_for_inst_src(fs_inst
*inst
, int dispatch_width
, bool *deps
,
2785 int first_grf
, int grf_len
)
2787 /* Clear the flag for registers that actually got read (as expected). */
2788 for (int i
= 0; i
< inst
->sources
; i
++) {
2790 if (inst
->src
[i
].file
== GRF
) {
2791 grf
= inst
->src
[i
].reg
;
2792 } else if (inst
->src
[i
].file
== HW_REG
&&
2793 inst
->src
[i
].fixed_hw_reg
.file
== BRW_GENERAL_REGISTER_FILE
) {
2794 grf
= inst
->src
[i
].fixed_hw_reg
.nr
;
2799 if (grf
>= first_grf
&&
2800 grf
< first_grf
+ grf_len
) {
2801 deps
[grf
- first_grf
] = false;
2802 if (inst
->exec_size
== 16)
2803 deps
[grf
- first_grf
+ 1] = false;
2809 * Implements this workaround for the original 965:
2811 * "[DevBW, DevCL] Implementation Restrictions: As the hardware does not
2812 * check for post destination dependencies on this instruction, software
2813 * must ensure that there is no destination hazard for the case of ‘write
2814 * followed by a posted write’ shown in the following example.
2817 * 2. send r3.xy <rest of send instruction>
2820 * Due to no post-destination dependency check on the ‘send’, the above
2821 * code sequence could have two instructions (1 and 2) in flight at the
2822 * same time that both consider ‘r3’ as the target of their final writes.
2825 fs_visitor::insert_gen4_pre_send_dependency_workarounds(bblock_t
*block
,
2828 int write_len
= inst
->regs_written
;
2829 int first_write_grf
= inst
->dst
.reg
;
2830 bool needs_dep
[BRW_MAX_MRF
];
2831 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2833 memset(needs_dep
, false, sizeof(needs_dep
));
2834 memset(needs_dep
, true, write_len
);
2836 clear_deps_for_inst_src(inst
, dispatch_width
,
2837 needs_dep
, first_write_grf
, write_len
);
2839 /* Walk backwards looking for writes to registers we're writing which
2840 * aren't read since being written. If we hit the start of the program,
2841 * we assume that there are no outstanding dependencies on entry to the
2844 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2845 /* If we hit control flow, assume that there *are* outstanding
2846 * dependencies, and force their cleanup before our instruction.
2848 if (block
->start() == scan_inst
) {
2849 for (int i
= 0; i
< write_len
; i
++) {
2851 inst
->insert_before(block
, DEP_RESOLVE_MOV(first_write_grf
+ i
));
2857 /* We insert our reads as late as possible on the assumption that any
2858 * instruction but a MOV that might have left us an outstanding
2859 * dependency has more latency than a MOV.
2861 if (scan_inst
->dst
.file
== GRF
) {
2862 for (int i
= 0; i
< scan_inst
->regs_written
; i
++) {
2863 int reg
= scan_inst
->dst
.reg
+ i
;
2865 if (reg
>= first_write_grf
&&
2866 reg
< first_write_grf
+ write_len
&&
2867 needs_dep
[reg
- first_write_grf
]) {
2868 inst
->insert_before(block
, DEP_RESOLVE_MOV(reg
));
2869 needs_dep
[reg
- first_write_grf
] = false;
2870 if (scan_inst
->exec_size
== 16)
2871 needs_dep
[reg
- first_write_grf
+ 1] = false;
2876 /* Clear the flag for registers that actually got read (as expected). */
2877 clear_deps_for_inst_src(scan_inst
, dispatch_width
,
2878 needs_dep
, first_write_grf
, write_len
);
2880 /* Continue the loop only if we haven't resolved all the dependencies */
2882 for (i
= 0; i
< write_len
; i
++) {
2892 * Implements this workaround for the original 965:
2894 * "[DevBW, DevCL] Errata: A destination register from a send can not be
2895 * used as a destination register until after it has been sourced by an
2896 * instruction with a different destination register.
2899 fs_visitor::insert_gen4_post_send_dependency_workarounds(bblock_t
*block
, fs_inst
*inst
)
2901 int write_len
= inst
->regs_written
;
2902 int first_write_grf
= inst
->dst
.reg
;
2903 bool needs_dep
[BRW_MAX_MRF
];
2904 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2906 memset(needs_dep
, false, sizeof(needs_dep
));
2907 memset(needs_dep
, true, write_len
);
2908 /* Walk forwards looking for writes to registers we're writing which aren't
2909 * read before being written.
2911 foreach_inst_in_block_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2912 /* If we hit control flow, force resolve all remaining dependencies. */
2913 if (block
->end() == scan_inst
) {
2914 for (int i
= 0; i
< write_len
; i
++) {
2916 scan_inst
->insert_before(block
,
2917 DEP_RESOLVE_MOV(first_write_grf
+ i
));
2922 /* Clear the flag for registers that actually got read (as expected). */
2923 clear_deps_for_inst_src(scan_inst
, dispatch_width
,
2924 needs_dep
, first_write_grf
, write_len
);
2926 /* We insert our reads as late as possible since they're reading the
2927 * result of a SEND, which has massive latency.
2929 if (scan_inst
->dst
.file
== GRF
&&
2930 scan_inst
->dst
.reg
>= first_write_grf
&&
2931 scan_inst
->dst
.reg
< first_write_grf
+ write_len
&&
2932 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
]) {
2933 scan_inst
->insert_before(block
, DEP_RESOLVE_MOV(scan_inst
->dst
.reg
));
2934 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
] = false;
2937 /* Continue the loop only if we haven't resolved all the dependencies */
2939 for (i
= 0; i
< write_len
; i
++) {
2947 /* If we hit the end of the program, resolve all remaining dependencies out
2950 fs_inst
*last_inst
= (fs_inst
*)this->instructions
.get_tail();
2951 assert(last_inst
->eot
);
2952 for (int i
= 0; i
< write_len
; i
++) {
2954 last_inst
->insert_before(block
, DEP_RESOLVE_MOV(first_write_grf
+ i
));
2959 fs_visitor::insert_gen4_send_dependency_workarounds()
2961 if (brw
->gen
!= 4 || brw
->is_g4x
)
2964 bool progress
= false;
2966 /* Note that we're done with register allocation, so GRF fs_regs always
2967 * have a .reg_offset of 0.
2970 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2971 if (inst
->mlen
!= 0 && inst
->dst
.file
== GRF
) {
2972 insert_gen4_pre_send_dependency_workarounds(block
, inst
);
2973 insert_gen4_post_send_dependency_workarounds(block
, inst
);
2979 invalidate_live_intervals();
2983 * Turns the generic expression-style uniform pull constant load instruction
2984 * into a hardware-specific series of instructions for loading a pull
2987 * The expression style allows the CSE pass before this to optimize out
2988 * repeated loads from the same offset, and gives the pre-register-allocation
2989 * scheduling full flexibility, while the conversion to native instructions
2990 * allows the post-register-allocation scheduler the best information
2993 * Note that execution masking for setting up pull constant loads is special:
2994 * the channels that need to be written are unrelated to the current execution
2995 * mask, since a later instruction will use one of the result channels as a
2996 * source operand for all 8 or 16 of its channels.
2999 fs_visitor::lower_uniform_pull_constant_loads()
3001 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
3002 if (inst
->opcode
!= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
)
3005 if (brw
->gen
>= 7) {
3006 /* The offset arg before was a vec4-aligned byte offset. We need to
3007 * turn it into a dword offset.
3009 fs_reg const_offset_reg
= inst
->src
[1];
3010 assert(const_offset_reg
.file
== IMM
&&
3011 const_offset_reg
.type
== BRW_REGISTER_TYPE_UD
);
3012 const_offset_reg
.fixed_hw_reg
.dw1
.ud
/= 4;
3013 fs_reg payload
= vgrf(glsl_type::uint_type
);
3015 /* We have to use a message header on Skylake to get SIMD4x2 mode.
3016 * Reserve space for the register.
3018 if (brw
->gen
>= 9) {
3019 payload
.reg_offset
++;
3020 alloc
.sizes
[payload
.reg
] = 2;
3023 /* This is actually going to be a MOV, but since only the first dword
3024 * is accessed, we have a special opcode to do just that one. Note
3025 * that this needs to be an operation that will be considered a def
3026 * by live variable analysis, or register allocation will explode.
3028 fs_inst
*setup
= new(mem_ctx
) fs_inst(FS_OPCODE_SET_SIMD4X2_OFFSET
,
3029 8, payload
, const_offset_reg
);
3030 setup
->force_writemask_all
= true;
3032 setup
->ir
= inst
->ir
;
3033 setup
->annotation
= inst
->annotation
;
3034 inst
->insert_before(block
, setup
);
3036 /* Similarly, this will only populate the first 4 channels of the
3037 * result register (since we only use smear values from 0-3), but we
3038 * don't tell the optimizer.
3040 inst
->opcode
= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
;
3041 inst
->src
[1] = payload
;
3043 invalidate_live_intervals();
3045 /* Before register allocation, we didn't tell the scheduler about the
3046 * MRF we use. We know it's safe to use this MRF because nothing
3047 * else does except for register spill/unspill, which generates and
3048 * uses its MRF within a single IR instruction.
3050 inst
->base_mrf
= 14;
3057 fs_visitor::lower_load_payload()
3059 bool progress
= false;
3061 int vgrf_to_reg
[alloc
.count
];
3062 int reg_count
= 16; /* Leave room for MRF */
3063 for (unsigned i
= 0; i
< alloc
.count
; ++i
) {
3064 vgrf_to_reg
[i
] = reg_count
;
3065 reg_count
+= alloc
.sizes
[i
];
3069 bool written
:1; /* Whether this register has ever been written */
3070 bool force_writemask_all
:1;
3071 bool force_sechalf
:1;
3072 } metadata
[reg_count
];
3073 memset(metadata
, 0, sizeof(metadata
));
3075 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3077 if (inst
->dst
.file
== GRF
) {
3078 dst_reg
= vgrf_to_reg
[inst
->dst
.reg
];
3081 dst_reg
= inst
->dst
.reg
;
3084 if (inst
->dst
.file
== MRF
|| inst
->dst
.file
== GRF
) {
3085 bool force_sechalf
= inst
->force_sechalf
;
3086 bool toggle_sechalf
= inst
->dst
.width
== 16 &&
3087 type_sz(inst
->dst
.type
) == 4;
3088 for (int i
= 0; i
< inst
->regs_written
; ++i
) {
3089 metadata
[dst_reg
+ i
].written
= true;
3090 metadata
[dst_reg
+ i
].force_sechalf
= force_sechalf
;
3091 metadata
[dst_reg
+ i
].force_writemask_all
= inst
->force_writemask_all
;
3092 force_sechalf
= (toggle_sechalf
!= force_sechalf
);
3096 if (inst
->opcode
== SHADER_OPCODE_LOAD_PAYLOAD
) {
3097 assert(inst
->dst
.file
== MRF
|| inst
->dst
.file
== GRF
);
3098 fs_reg dst
= inst
->dst
;
3100 for (int i
= 0; i
< inst
->sources
; i
++) {
3101 dst
.width
= inst
->src
[i
].effective_width
;
3102 dst
.type
= inst
->src
[i
].type
;
3104 if (inst
->src
[i
].file
== BAD_FILE
) {
3105 /* Do nothing but otherwise increment as normal */
3106 } else if (dst
.file
== MRF
&&
3109 i
+ 4 < inst
->sources
&&
3110 inst
->src
[i
+ 4].equals(horiz_offset(inst
->src
[i
], 8))) {
3111 fs_reg compr4_dst
= dst
;
3112 compr4_dst
.reg
+= BRW_MRF_COMPR4
;
3113 compr4_dst
.width
= 16;
3114 fs_reg compr4_src
= inst
->src
[i
];
3115 compr4_src
.width
= 16;
3116 fs_inst
*mov
= MOV(compr4_dst
, compr4_src
);
3117 mov
->force_writemask_all
= true;
3118 inst
->insert_before(block
, mov
);
3119 /* Mark i+4 as BAD_FILE so we don't emit a MOV for it */
3120 inst
->src
[i
+ 4].file
= BAD_FILE
;
3122 fs_inst
*mov
= MOV(dst
, inst
->src
[i
]);
3123 if (inst
->src
[i
].file
== GRF
) {
3124 int src_reg
= vgrf_to_reg
[inst
->src
[i
].reg
] +
3125 inst
->src
[i
].reg_offset
;
3126 mov
->force_sechalf
= metadata
[src_reg
].force_sechalf
;
3127 mov
->force_writemask_all
= metadata
[src_reg
].force_writemask_all
;
3128 metadata
[dst_reg
] = metadata
[src_reg
];
3129 if (dst
.width
* type_sz(dst
.type
) > 32) {
3130 assert((!metadata
[src_reg
].written
||
3131 !metadata
[src_reg
].force_sechalf
) &&
3132 (!metadata
[src_reg
+ 1].written
||
3133 metadata
[src_reg
+ 1].force_sechalf
));
3134 metadata
[dst_reg
+ 1] = metadata
[src_reg
+ 1];
3137 metadata
[dst_reg
].force_writemask_all
= false;
3138 metadata
[dst_reg
].force_sechalf
= false;
3139 if (dst
.width
== 16) {
3140 metadata
[dst_reg
+ 1].force_writemask_all
= false;
3141 metadata
[dst_reg
+ 1].force_sechalf
= true;
3144 inst
->insert_before(block
, mov
);
3147 dst
= offset(dst
, 1);
3150 inst
->remove(block
);
3156 invalidate_live_intervals();
3162 fs_visitor::dump_instructions()
3164 dump_instructions(NULL
);
3168 fs_visitor::dump_instructions(const char *name
)
3170 calculate_register_pressure();
3171 FILE *file
= stderr
;
3172 if (name
&& geteuid() != 0) {
3173 file
= fopen(name
, "w");
3178 int ip
= 0, max_pressure
= 0;
3179 foreach_block_and_inst(block
, backend_instruction
, inst
, cfg
) {
3180 max_pressure
= MAX2(max_pressure
, regs_live_at_ip
[ip
]);
3181 fprintf(file
, "{%3d} %4d: ", regs_live_at_ip
[ip
], ip
);
3182 dump_instruction(inst
, file
);
3185 fprintf(file
, "Maximum %3d registers live at once.\n", max_pressure
);
3187 if (file
!= stderr
) {
3193 fs_visitor::dump_instruction(backend_instruction
*be_inst
)
3195 dump_instruction(be_inst
, stderr
);
3199 fs_visitor::dump_instruction(backend_instruction
*be_inst
, FILE *file
)
3201 fs_inst
*inst
= (fs_inst
*)be_inst
;
3203 if (inst
->predicate
) {
3204 fprintf(file
, "(%cf0.%d) ",
3205 inst
->predicate_inverse
? '-' : '+',
3209 fprintf(file
, "%s", brw_instruction_name(inst
->opcode
));
3211 fprintf(file
, ".sat");
3212 if (inst
->conditional_mod
) {
3213 fprintf(file
, "%s", conditional_modifier
[inst
->conditional_mod
]);
3214 if (!inst
->predicate
&&
3215 (brw
->gen
< 5 || (inst
->opcode
!= BRW_OPCODE_SEL
&&
3216 inst
->opcode
!= BRW_OPCODE_IF
&&
3217 inst
->opcode
!= BRW_OPCODE_WHILE
))) {
3218 fprintf(file
, ".f0.%d", inst
->flag_subreg
);
3221 fprintf(file
, "(%d) ", inst
->exec_size
);
3224 switch (inst
->dst
.file
) {
3226 fprintf(file
, "vgrf%d", inst
->dst
.reg
);
3227 if (inst
->dst
.width
!= dispatch_width
)
3228 fprintf(file
, "@%d", inst
->dst
.width
);
3229 if (alloc
.sizes
[inst
->dst
.reg
] != inst
->dst
.width
/ 8 ||
3230 inst
->dst
.subreg_offset
)
3231 fprintf(file
, "+%d.%d",
3232 inst
->dst
.reg_offset
, inst
->dst
.subreg_offset
);
3235 fprintf(file
, "m%d", inst
->dst
.reg
);
3238 fprintf(file
, "(null)");
3241 fprintf(file
, "***u%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
3244 fprintf(file
, "***attr%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
3247 if (inst
->dst
.fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
3248 switch (inst
->dst
.fixed_hw_reg
.nr
) {
3250 fprintf(file
, "null");
3252 case BRW_ARF_ADDRESS
:
3253 fprintf(file
, "a0.%d", inst
->dst
.fixed_hw_reg
.subnr
);
3255 case BRW_ARF_ACCUMULATOR
:
3256 fprintf(file
, "acc%d", inst
->dst
.fixed_hw_reg
.subnr
);
3259 fprintf(file
, "f%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
3260 inst
->dst
.fixed_hw_reg
.subnr
);
3263 fprintf(file
, "arf%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
3264 inst
->dst
.fixed_hw_reg
.subnr
);
3268 fprintf(file
, "hw_reg%d", inst
->dst
.fixed_hw_reg
.nr
);
3270 if (inst
->dst
.fixed_hw_reg
.subnr
)
3271 fprintf(file
, "+%d", inst
->dst
.fixed_hw_reg
.subnr
);
3274 fprintf(file
, "???");
3277 fprintf(file
, ":%s, ", brw_reg_type_letters(inst
->dst
.type
));
3279 for (int i
= 0; i
< inst
->sources
; i
++) {
3280 if (inst
->src
[i
].negate
)
3282 if (inst
->src
[i
].abs
)
3284 switch (inst
->src
[i
].file
) {
3286 fprintf(file
, "vgrf%d", inst
->src
[i
].reg
);
3287 if (inst
->src
[i
].width
!= dispatch_width
)
3288 fprintf(file
, "@%d", inst
->src
[i
].width
);
3289 if (alloc
.sizes
[inst
->src
[i
].reg
] != inst
->src
[i
].width
/ 8 ||
3290 inst
->src
[i
].subreg_offset
)
3291 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
3292 inst
->src
[i
].subreg_offset
);
3295 fprintf(file
, "***m%d***", inst
->src
[i
].reg
);
3298 fprintf(file
, "attr%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
3301 fprintf(file
, "u%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
3302 if (inst
->src
[i
].reladdr
) {
3303 fprintf(file
, "+reladdr");
3304 } else if (inst
->src
[i
].subreg_offset
) {
3305 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
3306 inst
->src
[i
].subreg_offset
);
3310 fprintf(file
, "(null)");
3313 switch (inst
->src
[i
].type
) {
3314 case BRW_REGISTER_TYPE_F
:
3315 fprintf(file
, "%ff", inst
->src
[i
].fixed_hw_reg
.dw1
.f
);
3317 case BRW_REGISTER_TYPE_D
:
3318 fprintf(file
, "%dd", inst
->src
[i
].fixed_hw_reg
.dw1
.d
);
3320 case BRW_REGISTER_TYPE_UD
:
3321 fprintf(file
, "%uu", inst
->src
[i
].fixed_hw_reg
.dw1
.ud
);
3323 case BRW_REGISTER_TYPE_VF
:
3324 fprintf(file
, "[%-gF, %-gF, %-gF, %-gF]",
3325 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 0) & 0xff),
3326 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 8) & 0xff),
3327 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 16) & 0xff),
3328 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 24) & 0xff));
3331 fprintf(file
, "???");
3336 if (inst
->src
[i
].fixed_hw_reg
.negate
)
3338 if (inst
->src
[i
].fixed_hw_reg
.abs
)
3340 if (inst
->src
[i
].fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
3341 switch (inst
->src
[i
].fixed_hw_reg
.nr
) {
3343 fprintf(file
, "null");
3345 case BRW_ARF_ADDRESS
:
3346 fprintf(file
, "a0.%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3348 case BRW_ARF_ACCUMULATOR
:
3349 fprintf(file
, "acc%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3352 fprintf(file
, "f%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
3353 inst
->src
[i
].fixed_hw_reg
.subnr
);
3356 fprintf(file
, "arf%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
3357 inst
->src
[i
].fixed_hw_reg
.subnr
);
3361 fprintf(file
, "hw_reg%d", inst
->src
[i
].fixed_hw_reg
.nr
);
3363 if (inst
->src
[i
].fixed_hw_reg
.subnr
)
3364 fprintf(file
, "+%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3365 if (inst
->src
[i
].fixed_hw_reg
.abs
)
3369 fprintf(file
, "???");
3372 if (inst
->src
[i
].abs
)
3375 if (inst
->src
[i
].file
!= IMM
) {
3376 fprintf(file
, ":%s", brw_reg_type_letters(inst
->src
[i
].type
));
3379 if (i
< inst
->sources
- 1 && inst
->src
[i
+ 1].file
!= BAD_FILE
)
3380 fprintf(file
, ", ");
3385 if (dispatch_width
== 16 && inst
->exec_size
== 8) {
3386 if (inst
->force_sechalf
)
3387 fprintf(file
, "2ndhalf ");
3389 fprintf(file
, "1sthalf ");
3392 fprintf(file
, "\n");
3396 * Possibly returns an instruction that set up @param reg.
3398 * Sometimes we want to take the result of some expression/variable
3399 * dereference tree and rewrite the instruction generating the result
3400 * of the tree. When processing the tree, we know that the
3401 * instructions generated are all writing temporaries that are dead
3402 * outside of this tree. So, if we have some instructions that write
3403 * a temporary, we're free to point that temp write somewhere else.
3405 * Note that this doesn't guarantee that the instruction generated
3406 * only reg -- it might be the size=4 destination of a texture instruction.
3409 fs_visitor::get_instruction_generating_reg(fs_inst
*start
,
3414 end
->is_partial_write() ||
3416 !reg
.equals(end
->dst
)) {
3424 fs_visitor::setup_payload_gen6()
3427 (prog
->InputsRead
& (1 << VARYING_SLOT_POS
)) != 0;
3428 unsigned barycentric_interp_modes
=
3429 (stage
== MESA_SHADER_FRAGMENT
) ?
3430 ((brw_wm_prog_data
*) this->prog_data
)->barycentric_interp_modes
: 0;
3432 assert(brw
->gen
>= 6);
3434 /* R0-1: masks, pixel X/Y coordinates. */
3435 payload
.num_regs
= 2;
3436 /* R2: only for 32-pixel dispatch.*/
3438 /* R3-26: barycentric interpolation coordinates. These appear in the
3439 * same order that they appear in the brw_wm_barycentric_interp_mode
3440 * enum. Each set of coordinates occupies 2 registers if dispatch width
3441 * == 8 and 4 registers if dispatch width == 16. Coordinates only
3442 * appear if they were enabled using the "Barycentric Interpolation
3443 * Mode" bits in WM_STATE.
3445 for (int i
= 0; i
< BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT
; ++i
) {
3446 if (barycentric_interp_modes
& (1 << i
)) {
3447 payload
.barycentric_coord_reg
[i
] = payload
.num_regs
;
3448 payload
.num_regs
+= 2;
3449 if (dispatch_width
== 16) {
3450 payload
.num_regs
+= 2;
3455 /* R27: interpolated depth if uses source depth */
3457 payload
.source_depth_reg
= payload
.num_regs
;
3459 if (dispatch_width
== 16) {
3460 /* R28: interpolated depth if not SIMD8. */
3464 /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W. */
3466 payload
.source_w_reg
= payload
.num_regs
;
3468 if (dispatch_width
== 16) {
3469 /* R30: interpolated W if not SIMD8. */
3474 if (stage
== MESA_SHADER_FRAGMENT
) {
3475 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3476 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
3477 prog_data
->uses_pos_offset
= key
->compute_pos_offset
;
3478 /* R31: MSAA position offsets. */
3479 if (prog_data
->uses_pos_offset
) {
3480 payload
.sample_pos_reg
= payload
.num_regs
;
3485 /* R32: MSAA input coverage mask */
3486 if (prog
->SystemValuesRead
& SYSTEM_BIT_SAMPLE_MASK_IN
) {
3487 assert(brw
->gen
>= 7);
3488 payload
.sample_mask_in_reg
= payload
.num_regs
;
3490 if (dispatch_width
== 16) {
3491 /* R33: input coverage mask if not SIMD8. */
3496 /* R34-: bary for 32-pixel. */
3497 /* R58-59: interp W for 32-pixel. */
3499 if (prog
->OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
3500 source_depth_to_render_target
= true;
3505 fs_visitor::setup_vs_payload()
3507 /* R0: thread header, R1: urb handles */
3508 payload
.num_regs
= 2;
3512 fs_visitor::assign_binding_table_offsets()
3514 assert(stage
== MESA_SHADER_FRAGMENT
);
3515 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3516 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
3517 uint32_t next_binding_table_offset
= 0;
3519 /* If there are no color regions, we still perform an FB write to a null
3520 * renderbuffer, which we place at surface index 0.
3522 prog_data
->binding_table
.render_target_start
= next_binding_table_offset
;
3523 next_binding_table_offset
+= MAX2(key
->nr_color_regions
, 1);
3525 assign_common_binding_table_offsets(next_binding_table_offset
);
3529 fs_visitor::calculate_register_pressure()
3531 invalidate_live_intervals();
3532 calculate_live_intervals();
3534 unsigned num_instructions
= 0;
3535 foreach_block(block
, cfg
)
3536 num_instructions
+= block
->instructions
.length();
3538 regs_live_at_ip
= rzalloc_array(mem_ctx
, int, num_instructions
);
3540 for (unsigned reg
= 0; reg
< alloc
.count
; reg
++) {
3541 for (int ip
= virtual_grf_start
[reg
]; ip
<= virtual_grf_end
[reg
]; ip
++)
3542 regs_live_at_ip
[ip
] += alloc
.sizes
[reg
];
3547 fs_visitor::optimize()
3549 const char *stage_name
= stage
== MESA_SHADER_VERTEX
? "vs" : "fs";
3553 split_virtual_grfs();
3555 move_uniform_array_access_to_pull_constants();
3556 assign_constant_locations();
3557 demote_pull_constants();
3559 #define OPT(pass, args...) ({ \
3561 bool this_progress = pass(args); \
3563 if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
3564 char filename[64]; \
3565 snprintf(filename, 64, "%s%d-%04d-%02d-%02d-" #pass, \
3566 stage_name, dispatch_width, shader_prog ? shader_prog->Name : 0, iteration, pass_num); \
3568 backend_visitor::dump_instructions(filename); \
3571 progress = progress || this_progress; \
3575 if (unlikely(INTEL_DEBUG
& DEBUG_OPTIMIZER
)) {
3577 snprintf(filename
, 64, "%s%d-%04d-00-start",
3578 stage_name
, dispatch_width
, shader_prog
? shader_prog
->Name
: 0);
3580 backend_visitor::dump_instructions(filename
);
3591 OPT(remove_duplicate_mrf_writes
);
3595 OPT(opt_copy_propagate
);
3596 OPT(opt_peephole_predicated_break
);
3597 OPT(opt_cmod_propagation
);
3598 OPT(dead_code_eliminate
);
3599 OPT(opt_peephole_sel
);
3600 OPT(dead_control_flow_eliminate
, this);
3601 OPT(opt_register_renaming
);
3602 OPT(opt_saturate_propagation
);
3603 OPT(register_coalesce
);
3604 OPT(compute_to_mrf
);
3606 OPT(compact_virtual_grfs
);
3611 if (OPT(lower_load_payload
)) {
3612 split_virtual_grfs();
3613 OPT(register_coalesce
);
3614 OPT(compute_to_mrf
);
3615 OPT(dead_code_eliminate
);
3618 lower_uniform_pull_constant_loads();
3622 * Three source instruction must have a GRF/MRF destination register.
3623 * ARF NULL is not allowed. Fix that up by allocating a temporary GRF.
3626 fs_visitor::fixup_3src_null_dest()
3628 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3629 if (inst
->is_3src() && inst
->dst
.is_null()) {
3630 inst
->dst
= fs_reg(GRF
, alloc
.allocate(dispatch_width
/ 8),
3637 fs_visitor::allocate_registers()
3639 bool allocated_without_spills
;
3641 static const enum instruction_scheduler_mode pre_modes
[] = {
3643 SCHEDULE_PRE_NON_LIFO
,
3647 /* Try each scheduling heuristic to see if it can successfully register
3648 * allocate without spilling. They should be ordered by decreasing
3649 * performance but increasing likelihood of allocating.
3651 for (unsigned i
= 0; i
< ARRAY_SIZE(pre_modes
); i
++) {
3652 schedule_instructions(pre_modes
[i
]);
3655 assign_regs_trivial();
3656 allocated_without_spills
= true;
3658 allocated_without_spills
= assign_regs(false);
3660 if (allocated_without_spills
)
3664 if (!allocated_without_spills
) {
3665 const char *stage_name
= stage
== MESA_SHADER_VERTEX
?
3666 "Vertex" : "Fragment";
3668 /* We assume that any spilling is worse than just dropping back to
3669 * SIMD8. There's probably actually some intermediate point where
3670 * SIMD16 with a couple of spills is still better.
3672 if (dispatch_width
== 16) {
3673 fail("Failure to register allocate. Reduce number of "
3674 "live scalar values to avoid this.");
3676 perf_debug("%s shader triggered register spilling. "
3677 "Try reducing the number of live scalar values to "
3678 "improve performance.\n", stage_name
);
3681 /* Since we're out of heuristics, just go spill registers until we
3682 * get an allocation.
3684 while (!assign_regs(true)) {
3690 /* This must come after all optimization and register allocation, since
3691 * it inserts dead code that happens to have side effects, and it does
3692 * so based on the actual physical registers in use.
3694 insert_gen4_send_dependency_workarounds();
3699 if (!allocated_without_spills
)
3700 schedule_instructions(SCHEDULE_POST
);
3702 if (last_scratch
> 0)
3703 prog_data
->total_scratch
= brw_get_scratch_size(last_scratch
);
3707 fs_visitor::run_vs()
3709 assert(stage
== MESA_SHADER_VERTEX
);
3711 assign_common_binding_table_offsets(0);
3714 if (INTEL_DEBUG
& DEBUG_SHADER_TIME
)
3715 emit_shader_time_begin();
3717 foreach_in_list(ir_instruction
, ir
, shader
->base
.ir
) {
3719 this->result
= reg_undef
;
3730 assign_curb_setup();
3731 assign_vs_urb_setup();
3733 fixup_3src_null_dest();
3734 allocate_registers();
3740 fs_visitor::run_fs()
3742 brw_wm_prog_data
*wm_prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3743 brw_wm_prog_key
*wm_key
= (brw_wm_prog_key
*) this->key
;
3745 assert(stage
== MESA_SHADER_FRAGMENT
);
3747 sanity_param_count
= prog
->Parameters
->NumParameters
;
3749 assign_binding_table_offsets();
3752 setup_payload_gen6();
3754 setup_payload_gen4();
3758 } else if (brw
->use_rep_send
&& dispatch_width
== 16) {
3759 emit_repclear_shader();
3761 if (INTEL_DEBUG
& DEBUG_SHADER_TIME
)
3762 emit_shader_time_begin();
3764 calculate_urb_setup();
3765 if (prog
->InputsRead
> 0) {
3767 emit_interpolation_setup_gen4();
3769 emit_interpolation_setup_gen6();
3772 /* We handle discards by keeping track of the still-live pixels in f0.1.
3773 * Initialize it with the dispatched pixels.
3775 if (wm_prog_data
->uses_kill
) {
3776 fs_inst
*discard_init
= emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
3777 discard_init
->flag_subreg
= 1;
3780 /* Generate FS IR for main(). (the visitor only descends into
3781 * functions called "main").
3784 if (getenv("INTEL_USE_NIR") != NULL
) {
3787 foreach_in_list(ir_instruction
, ir
, shader
->base
.ir
) {
3789 this->result
= reg_undef
;
3794 emit_fragment_program_code();
3800 emit(FS_OPCODE_PLACEHOLDER_HALT
);
3802 if (wm_key
->alpha_test_func
)
3809 assign_curb_setup();
3812 fixup_3src_null_dest();
3813 allocate_registers();
3819 if (dispatch_width
== 8)
3820 wm_prog_data
->reg_blocks
= brw_register_blocks(grf_used
);
3822 wm_prog_data
->reg_blocks_16
= brw_register_blocks(grf_used
);
3824 /* If any state parameters were appended, then ParameterValues could have
3825 * been realloced, in which case the driver uniform storage set up by
3826 * _mesa_associate_uniform_storage() would point to freed memory. Make
3827 * sure that didn't happen.
3829 assert(sanity_param_count
== prog
->Parameters
->NumParameters
);
3835 brw_wm_fs_emit(struct brw_context
*brw
,
3837 const struct brw_wm_prog_key
*key
,
3838 struct brw_wm_prog_data
*prog_data
,
3839 struct gl_fragment_program
*fp
,
3840 struct gl_shader_program
*prog
,
3841 unsigned *final_assembly_size
)
3843 bool start_busy
= false;
3844 double start_time
= 0;
3846 if (unlikely(brw
->perf_debug
)) {
3847 start_busy
= (brw
->batch
.last_bo
&&
3848 drm_intel_bo_busy(brw
->batch
.last_bo
));
3849 start_time
= get_time();
3852 struct brw_shader
*shader
= NULL
;
3854 shader
= (brw_shader
*) prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
3856 if (unlikely(INTEL_DEBUG
& DEBUG_WM
))
3857 brw_dump_ir("fragment", prog
, &shader
->base
, &fp
->Base
);
3859 /* Now the main event: Visit the shader IR and generate our FS IR for it.
3861 fs_visitor
v(brw
, mem_ctx
, key
, prog_data
, prog
, fp
, 8);
3864 prog
->LinkStatus
= false;
3865 ralloc_strcat(&prog
->InfoLog
, v
.fail_msg
);
3868 _mesa_problem(NULL
, "Failed to compile fragment shader: %s\n",
3874 cfg_t
*simd16_cfg
= NULL
;
3875 fs_visitor
v2(brw
, mem_ctx
, key
, prog_data
, prog
, fp
, 16);
3876 if (brw
->gen
>= 5 && likely(!(INTEL_DEBUG
& DEBUG_NO16
) ||
3877 brw
->use_rep_send
)) {
3878 if (!v
.simd16_unsupported
) {
3879 /* Try a SIMD16 compile */
3880 v2
.import_uniforms(&v
);
3882 perf_debug("SIMD16 shader failed to compile, falling back to "
3883 "SIMD8 at a 10-20%% performance cost: %s", v2
.fail_msg
);
3885 simd16_cfg
= v2
.cfg
;
3888 perf_debug("SIMD16 shader unsupported, falling back to "
3889 "SIMD8 at a 10-20%% performance cost: %s", v
.no16_msg
);
3894 int no_simd8
= (INTEL_DEBUG
& DEBUG_NO8
) || brw
->no_simd8
;
3895 if (no_simd8
&& simd16_cfg
) {
3897 prog_data
->no_8
= true;
3900 prog_data
->no_8
= false;
3903 fs_generator
g(brw
, mem_ctx
, (void *) key
, &prog_data
->base
,
3904 &fp
->Base
, v
.runtime_check_aads_emit
, "FS");
3906 if (unlikely(INTEL_DEBUG
& DEBUG_WM
)) {
3909 name
= ralloc_asprintf(mem_ctx
, "%s fragment shader %d",
3910 prog
->Label
? prog
->Label
: "unnamed",
3913 name
= ralloc_asprintf(mem_ctx
, "fragment program %d", fp
->Base
.Id
);
3915 g
.enable_debug(name
);
3919 g
.generate_code(simd8_cfg
, 8);
3921 prog_data
->prog_offset_16
= g
.generate_code(simd16_cfg
, 16);
3923 if (unlikely(brw
->perf_debug
) && shader
) {
3924 if (shader
->compiled_once
)
3925 brw_wm_debug_recompile(brw
, prog
, key
);
3926 shader
->compiled_once
= true;
3928 if (start_busy
&& !drm_intel_bo_busy(brw
->batch
.last_bo
)) {
3929 perf_debug("FS compile took %.03f ms and stalled the GPU\n",
3930 (get_time() - start_time
) * 1000);
3934 return g
.get_assembly(final_assembly_size
);
3938 brw_fs_precompile(struct gl_context
*ctx
,
3939 struct gl_shader_program
*shader_prog
,
3940 struct gl_program
*prog
)
3942 struct brw_context
*brw
= brw_context(ctx
);
3943 struct brw_wm_prog_key key
;
3945 struct gl_fragment_program
*fp
= (struct gl_fragment_program
*) prog
;
3946 struct brw_fragment_program
*bfp
= brw_fragment_program(fp
);
3947 bool program_uses_dfdy
= fp
->UsesDFdy
;
3949 memset(&key
, 0, sizeof(key
));
3953 key
.iz_lookup
|= IZ_PS_KILL_ALPHATEST_BIT
;
3955 if (fp
->Base
.OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
))
3956 key
.iz_lookup
|= IZ_PS_COMPUTES_DEPTH_BIT
;
3958 /* Just assume depth testing. */
3959 key
.iz_lookup
|= IZ_DEPTH_TEST_ENABLE_BIT
;
3960 key
.iz_lookup
|= IZ_DEPTH_WRITE_ENABLE_BIT
;
3963 if (brw
->gen
< 6 || _mesa_bitcount_64(fp
->Base
.InputsRead
&
3964 BRW_FS_VARYING_INPUT_MASK
) > 16)
3965 key
.input_slots_valid
= fp
->Base
.InputsRead
| VARYING_BIT_POS
;
3967 const bool has_shader_channel_select
= brw
->is_haswell
|| brw
->gen
>= 8;
3968 unsigned sampler_count
= _mesa_fls(fp
->Base
.SamplersUsed
);
3969 for (unsigned i
= 0; i
< sampler_count
; i
++) {
3970 if (!has_shader_channel_select
&& (fp
->Base
.ShadowSamplers
& (1 << i
))) {
3971 /* Assume DEPTH_TEXTURE_MODE is the default: X, X, X, 1 */
3972 key
.tex
.swizzles
[i
] =
3973 MAKE_SWIZZLE4(SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_ONE
);
3975 /* Color sampler: assume no swizzling. */
3976 key
.tex
.swizzles
[i
] = SWIZZLE_XYZW
;
3980 if (fp
->Base
.InputsRead
& VARYING_BIT_POS
) {
3981 key
.drawable_height
= ctx
->DrawBuffer
->Height
;
3984 key
.nr_color_regions
= _mesa_bitcount_64(fp
->Base
.OutputsWritten
&
3985 ~(BITFIELD64_BIT(FRAG_RESULT_DEPTH
) |
3986 BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK
)));
3988 if ((fp
->Base
.InputsRead
& VARYING_BIT_POS
) || program_uses_dfdy
) {
3989 key
.render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
) ||
3990 key
.nr_color_regions
> 1;
3993 key
.program_string_id
= bfp
->id
;
3995 uint32_t old_prog_offset
= brw
->wm
.base
.prog_offset
;
3996 struct brw_wm_prog_data
*old_prog_data
= brw
->wm
.prog_data
;
3998 bool success
= do_wm_prog(brw
, shader_prog
, bfp
, &key
);
4000 brw
->wm
.base
.prog_offset
= old_prog_offset
;
4001 brw
->wm
.prog_data
= old_prog_data
;