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 fs_reg
*src
, int sources
)
59 memset(this, 0, sizeof(*this));
61 this->opcode
= opcode
;
64 this->sources
= sources
;
65 this->exec_size
= exec_size
;
67 assert(dst
.file
!= IMM
&& dst
.file
!= UNIFORM
);
69 /* If exec_size == 0, try to guess it from the registers. Since all
70 * manner of things may use hardware registers, we first try to guess
71 * based on GRF registers. If this fails, we will go ahead and take the
72 * width from the destination register.
74 if (this->exec_size
== 0) {
75 if (dst
.file
== GRF
) {
76 this->exec_size
= dst
.width
;
78 for (int i
= 0; i
< sources
; ++i
) {
79 if (src
[i
].file
!= GRF
&& src
[i
].file
!= ATTR
)
82 if (this->exec_size
<= 1)
83 this->exec_size
= src
[i
].width
;
84 assert(src
[i
].width
== 1 || src
[i
].width
== this->exec_size
);
88 if (this->exec_size
== 0 && dst
.file
!= BAD_FILE
)
89 this->exec_size
= dst
.width
;
91 assert(this->exec_size
!= 0);
93 for (int i
= 0; i
< sources
; ++i
) {
94 switch (this->src
[i
].file
) {
96 this->src
[i
].effective_width
= 8;
101 assert(this->src
[i
].width
> 0);
102 if (this->src
[i
].width
== 1) {
103 this->src
[i
].effective_width
= this->exec_size
;
105 this->src
[i
].effective_width
= this->src
[i
].width
;
110 this->src
[i
].effective_width
= this->exec_size
;
113 unreachable("Invalid source register file");
116 this->dst
.effective_width
= this->exec_size
;
118 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
120 /* This will be the case for almost all instructions. */
126 this->regs_written
= (dst
.width
* dst
.stride
* type_sz(dst
.type
) + 31) / 32;
129 this->regs_written
= 0;
133 unreachable("Invalid destination register file");
135 unreachable("Invalid register file");
138 this->writes_accumulator
= false;
143 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
144 init(BRW_OPCODE_NOP
, 8, dst
, src
, 0);
147 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
)
149 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
150 init(opcode
, exec_size
, reg_undef
, src
, 0);
153 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
)
155 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
156 init(opcode
, 0, dst
, src
, 0);
159 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
162 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
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 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
171 init(opcode
, 0, dst
, src
, 1);
174 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
175 const fs_reg
&src0
, const fs_reg
&src1
)
177 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
180 init(opcode
, exec_size
, dst
, src
, 2);
183 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
186 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
189 init(opcode
, 0, dst
, src
, 2);
192 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_size
, const fs_reg
&dst
,
193 const fs_reg
&src0
, const fs_reg
&src1
, const fs_reg
&src2
)
195 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
199 init(opcode
, exec_size
, dst
, src
, 3);
202 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
203 const fs_reg
&src1
, const fs_reg
&src2
)
205 fs_reg
*src
= ralloc_array(this, fs_reg
, 3);
209 init(opcode
, 0, dst
, src
, 3);
212 fs_inst::fs_inst(enum opcode opcode
, const fs_reg
&dst
, fs_reg src
[], int sources
)
214 init(opcode
, 0, dst
, src
, sources
);
217 fs_inst::fs_inst(enum opcode opcode
, uint8_t exec_width
, const fs_reg
&dst
,
218 fs_reg src
[], int sources
)
220 init(opcode
, exec_width
, dst
, src
, sources
);
223 fs_inst::fs_inst(const fs_inst
&that
)
225 memcpy(this, &that
, sizeof(that
));
227 this->src
= ralloc_array(this, fs_reg
, that
.sources
);
229 for (int i
= 0; i
< that
.sources
; i
++)
230 this->src
[i
] = that
.src
[i
];
234 fs_inst::resize_sources(uint8_t num_sources
)
236 if (this->sources
!= num_sources
) {
237 this->src
= reralloc(this, this->src
, fs_reg
, num_sources
);
238 this->sources
= num_sources
;
244 fs_visitor::op(const fs_reg &dst, const fs_reg &src0) \
246 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0); \
251 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
252 const fs_reg &src1) \
254 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1); \
257 #define ALU2_ACC(op) \
259 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
260 const fs_reg &src1) \
262 fs_inst *inst = new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1);\
263 inst->writes_accumulator = true; \
269 fs_visitor::op(const fs_reg &dst, const fs_reg &src0, \
270 const fs_reg &src1, const fs_reg &src2) \
272 return new(mem_ctx) fs_inst(BRW_OPCODE_##op, dst, src0, src1, src2);\
304 /** Gen4 predicated IF. */
306 fs_visitor::IF(enum brw_predicate predicate
)
308 fs_inst
*inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_IF
, dispatch_width
);
309 inst
->predicate
= predicate
;
313 /** Gen6 IF with embedded comparison. */
315 fs_visitor::IF(const fs_reg
&src0
, const fs_reg
&src1
,
316 enum brw_conditional_mod condition
)
318 assert(brw
->gen
== 6);
319 fs_inst
*inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_IF
, dispatch_width
,
320 reg_null_d
, src0
, src1
);
321 inst
->conditional_mod
= condition
;
326 * CMP: Sets the low bit of the destination channels with the result
327 * of the comparison, while the upper bits are undefined, and updates
328 * the flag register with the packed 16 bits of the result.
331 fs_visitor::CMP(fs_reg dst
, fs_reg src0
, fs_reg src1
,
332 enum brw_conditional_mod condition
)
336 /* Take the instruction:
338 * CMP null<d> src0<f> src1<f>
340 * Original gen4 does type conversion to the destination type before
341 * comparison, producing garbage results for floating point comparisons.
343 * The destination type doesn't matter on newer generations, so we set the
344 * type to match src0 so we can compact the instruction.
346 dst
.type
= src0
.type
;
347 if (dst
.file
== HW_REG
)
348 dst
.fixed_hw_reg
.type
= dst
.type
;
350 resolve_ud_negate(&src0
);
351 resolve_ud_negate(&src1
);
353 inst
= new(mem_ctx
) fs_inst(BRW_OPCODE_CMP
, dst
, src0
, src1
);
354 inst
->conditional_mod
= condition
;
360 fs_visitor::LOAD_PAYLOAD(const fs_reg
&dst
, fs_reg
*src
, int sources
)
362 uint8_t exec_size
= dst
.width
;
363 for (int i
= 0; i
< sources
; ++i
) {
364 assert(src
[i
].width
% dst
.width
== 0);
365 if (src
[i
].width
> exec_size
)
366 exec_size
= src
[i
].width
;
369 fs_inst
*inst
= new(mem_ctx
) fs_inst(SHADER_OPCODE_LOAD_PAYLOAD
, exec_size
,
371 inst
->regs_written
= 0;
372 for (int i
= 0; i
< sources
; ++i
) {
373 /* The LOAD_PAYLOAD instruction only really makes sense if we are
374 * dealing with whole registers. If this ever changes, we can deal
377 int size
= src
[i
].effective_width
* type_sz(src
[i
].type
);
378 assert(size
% 32 == 0);
379 inst
->regs_written
+= (size
+ 31) / 32;
386 fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_reg
&dst
,
387 const fs_reg
&surf_index
,
388 const fs_reg
&varying_offset
,
389 uint32_t const_offset
)
391 exec_list instructions
;
394 /* We have our constant surface use a pitch of 4 bytes, so our index can
395 * be any component of a vector, and then we load 4 contiguous
396 * components starting from that.
398 * We break down the const_offset to a portion added to the variable
399 * offset and a portion done using reg_offset, which means that if you
400 * have GLSL using something like "uniform vec4 a[20]; gl_FragColor =
401 * a[i]", we'll temporarily generate 4 vec4 loads from offset i * 4, and
402 * CSE can later notice that those loads are all the same and eliminate
403 * the redundant ones.
405 fs_reg vec4_offset
= vgrf(glsl_type::int_type
);
406 instructions
.push_tail(ADD(vec4_offset
,
407 varying_offset
, fs_reg(const_offset
& ~3)));
410 if (brw
->gen
== 4 && dst
.width
== 8) {
411 /* Pre-gen5, we can either use a SIMD8 message that requires (header,
412 * u, v, r) as parameters, or we can just use the SIMD16 message
413 * consisting of (header, u). We choose the second, at the cost of a
414 * longer return length.
421 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
;
423 op
= FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
;
425 assert(dst
.width
% 8 == 0);
426 int regs_written
= 4 * (dst
.width
/ 8) * scale
;
427 fs_reg vec4_result
= fs_reg(GRF
, virtual_grf_alloc(regs_written
),
428 dst
.type
, dst
.width
);
429 inst
= new(mem_ctx
) fs_inst(op
, vec4_result
, surf_index
, vec4_offset
);
430 inst
->regs_written
= regs_written
;
431 instructions
.push_tail(inst
);
435 inst
->header_present
= true;
439 inst
->mlen
= 1 + dispatch_width
/ 8;
442 fs_reg result
= offset(vec4_result
, (const_offset
& 3) * scale
);
443 instructions
.push_tail(MOV(dst
, result
));
449 * A helper for MOV generation for fixing up broken hardware SEND dependency
453 fs_visitor::DEP_RESOLVE_MOV(int grf
)
455 fs_inst
*inst
= MOV(brw_null_reg(), fs_reg(GRF
, grf
, BRW_REGISTER_TYPE_F
));
458 inst
->annotation
= "send dependency resolve";
460 /* The caller always wants uncompressed to emit the minimal extra
461 * dependencies, and to avoid having to deal with aligning its regs to 2.
469 fs_inst::equals(fs_inst
*inst
) const
471 return (opcode
== inst
->opcode
&&
472 dst
.equals(inst
->dst
) &&
473 src
[0].equals(inst
->src
[0]) &&
474 src
[1].equals(inst
->src
[1]) &&
475 src
[2].equals(inst
->src
[2]) &&
476 saturate
== inst
->saturate
&&
477 predicate
== inst
->predicate
&&
478 conditional_mod
== inst
->conditional_mod
&&
479 mlen
== inst
->mlen
&&
480 base_mrf
== inst
->base_mrf
&&
481 target
== inst
->target
&&
483 header_present
== inst
->header_present
&&
484 shadow_compare
== inst
->shadow_compare
&&
485 exec_size
== inst
->exec_size
&&
486 offset
== inst
->offset
);
490 fs_inst::overwrites_reg(const fs_reg
®
) const
492 return (reg
.file
== dst
.file
&&
493 reg
.reg
== dst
.reg
&&
494 reg
.reg_offset
>= dst
.reg_offset
&&
495 reg
.reg_offset
< dst
.reg_offset
+ regs_written
);
499 fs_inst::is_send_from_grf() const
502 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7
:
503 case SHADER_OPCODE_SHADER_TIME_ADD
:
504 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
505 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
506 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
507 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
508 case SHADER_OPCODE_UNTYPED_ATOMIC
:
509 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
510 case SHADER_OPCODE_URB_WRITE_SIMD8
:
512 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
513 return src
[1].file
== GRF
;
514 case FS_OPCODE_FB_WRITE
:
515 return src
[0].file
== GRF
;
518 return src
[0].file
== GRF
;
525 fs_inst::can_do_source_mods(struct brw_context
*brw
)
527 if (brw
->gen
== 6 && is_math())
530 if (is_send_from_grf())
533 if (!backend_instruction::can_do_source_mods())
542 memset(this, 0, sizeof(*this));
546 /** Generic unset register constructor. */
550 this->file
= BAD_FILE
;
553 /** Immediate value constructor. */
554 fs_reg::fs_reg(float f
)
558 this->type
= BRW_REGISTER_TYPE_F
;
559 this->fixed_hw_reg
.dw1
.f
= f
;
563 /** Immediate value constructor. */
564 fs_reg::fs_reg(int32_t i
)
568 this->type
= BRW_REGISTER_TYPE_D
;
569 this->fixed_hw_reg
.dw1
.d
= i
;
573 /** Immediate value constructor. */
574 fs_reg::fs_reg(uint32_t u
)
578 this->type
= BRW_REGISTER_TYPE_UD
;
579 this->fixed_hw_reg
.dw1
.ud
= u
;
583 /** Vector float immediate value constructor. */
584 fs_reg::fs_reg(uint8_t vf
[4])
588 this->type
= BRW_REGISTER_TYPE_VF
;
589 memcpy(&this->fixed_hw_reg
.dw1
.ud
, vf
, sizeof(unsigned));
592 /** Vector float immediate value constructor. */
593 fs_reg::fs_reg(uint8_t vf0
, uint8_t vf1
, uint8_t vf2
, uint8_t vf3
)
597 this->type
= BRW_REGISTER_TYPE_VF
;
598 this->fixed_hw_reg
.dw1
.ud
= (vf0
<< 0) |
604 /** Fixed brw_reg. */
605 fs_reg::fs_reg(struct brw_reg fixed_hw_reg
)
609 this->fixed_hw_reg
= fixed_hw_reg
;
610 this->type
= fixed_hw_reg
.type
;
611 this->width
= 1 << fixed_hw_reg
.width
;
615 fs_reg::equals(const fs_reg
&r
) const
617 return (file
== r
.file
&&
619 reg_offset
== r
.reg_offset
&&
620 subreg_offset
== r
.subreg_offset
&&
622 negate
== r
.negate
&&
624 !reladdr
&& !r
.reladdr
&&
625 memcmp(&fixed_hw_reg
, &r
.fixed_hw_reg
, sizeof(fixed_hw_reg
)) == 0 &&
631 fs_reg::set_smear(unsigned subreg
)
633 assert(file
!= HW_REG
&& file
!= IMM
);
634 subreg_offset
= subreg
* type_sz(type
);
640 fs_reg::is_contiguous() const
646 fs_visitor::type_size(const struct glsl_type
*type
)
648 unsigned int size
, i
;
650 switch (type
->base_type
) {
653 case GLSL_TYPE_FLOAT
:
655 return type
->components();
656 case GLSL_TYPE_ARRAY
:
657 return type_size(type
->fields
.array
) * type
->length
;
658 case GLSL_TYPE_STRUCT
:
660 for (i
= 0; i
< type
->length
; i
++) {
661 size
+= type_size(type
->fields
.structure
[i
].type
);
664 case GLSL_TYPE_SAMPLER
:
665 /* Samplers take up no register space, since they're baked in at
669 case GLSL_TYPE_ATOMIC_UINT
:
671 case GLSL_TYPE_IMAGE
:
673 case GLSL_TYPE_ERROR
:
674 case GLSL_TYPE_INTERFACE
:
675 unreachable("not reached");
682 fs_visitor::get_timestamp()
684 assert(brw
->gen
>= 7);
686 fs_reg ts
= fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE
,
689 BRW_REGISTER_TYPE_UD
));
691 fs_reg dst
= fs_reg(GRF
, virtual_grf_alloc(1), BRW_REGISTER_TYPE_UD
, 4);
693 fs_inst
*mov
= emit(MOV(dst
, ts
));
694 /* We want to read the 3 fields we care about even if it's not enabled in
697 mov
->force_writemask_all
= true;
699 /* The caller wants the low 32 bits of the timestamp. Since it's running
700 * at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,
701 * which is plenty of time for our purposes. It is identical across the
702 * EUs, but since it's tracking GPU core speed it will increment at a
703 * varying rate as render P-states change.
705 * The caller could also check if render P-states have changed (or anything
706 * else that might disrupt timing) by setting smear to 2 and checking if
707 * that field is != 0.
715 fs_visitor::emit_shader_time_begin()
717 current_annotation
= "shader time start";
718 shader_start_time
= get_timestamp();
722 fs_visitor::emit_shader_time_end()
724 current_annotation
= "shader time end";
726 enum shader_time_shader_type type
, written_type
, reset_type
;
727 if (dispatch_width
== 8) {
729 written_type
= ST_FS8_WRITTEN
;
730 reset_type
= ST_FS8_RESET
;
732 assert(dispatch_width
== 16);
734 written_type
= ST_FS16_WRITTEN
;
735 reset_type
= ST_FS16_RESET
;
738 fs_reg shader_end_time
= get_timestamp();
740 /* Check that there weren't any timestamp reset events (assuming these
741 * were the only two timestamp reads that happened).
743 fs_reg reset
= shader_end_time
;
745 fs_inst
*test
= emit(AND(reg_null_d
, reset
, fs_reg(1u)));
746 test
->conditional_mod
= BRW_CONDITIONAL_Z
;
747 emit(IF(BRW_PREDICATE_NORMAL
));
749 fs_reg start
= shader_start_time
;
751 fs_reg diff
= fs_reg(GRF
, virtual_grf_alloc(1), BRW_REGISTER_TYPE_UD
, 1);
752 emit(ADD(diff
, start
, shader_end_time
));
754 /* If there were no instructions between the two timestamp gets, the diff
755 * is 2 cycles. Remove that overhead, so I can forget about that when
756 * trying to determine the time taken for single instructions.
758 emit(ADD(diff
, diff
, fs_reg(-2u)));
760 emit_shader_time_write(type
, diff
);
761 emit_shader_time_write(written_type
, fs_reg(1u));
762 emit(BRW_OPCODE_ELSE
);
763 emit_shader_time_write(reset_type
, fs_reg(1u));
764 emit(BRW_OPCODE_ENDIF
);
768 fs_visitor::emit_shader_time_write(enum shader_time_shader_type type
,
771 int shader_time_index
=
772 brw_get_shader_time_index(brw
, shader_prog
, prog
, type
);
773 fs_reg offset
= fs_reg(shader_time_index
* SHADER_TIME_STRIDE
);
776 if (dispatch_width
== 8)
777 payload
= vgrf(glsl_type::uvec2_type
);
779 payload
= vgrf(glsl_type::uint_type
);
781 emit(new(mem_ctx
) fs_inst(SHADER_OPCODE_SHADER_TIME_ADD
,
782 fs_reg(), payload
, offset
, value
));
786 fs_visitor::vfail(const char *format
, va_list va
)
795 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
796 msg
= ralloc_asprintf(mem_ctx
, "FS compile failed: %s\n", msg
);
798 this->fail_msg
= msg
;
800 if (INTEL_DEBUG
& DEBUG_WM
) {
801 fprintf(stderr
, "%s", msg
);
806 fs_visitor::fail(const char *format
, ...)
810 va_start(va
, format
);
816 * Mark this program as impossible to compile in SIMD16 mode.
818 * During the SIMD8 compile (which happens first), we can detect and flag
819 * things that are unsupported in SIMD16 mode, so the compiler can skip
820 * the SIMD16 compile altogether.
822 * During a SIMD16 compile (if one happens anyway), this just calls fail().
825 fs_visitor::no16(const char *format
, ...)
829 va_start(va
, format
);
831 if (dispatch_width
== 16) {
834 simd16_unsupported
= true;
836 if (brw
->perf_debug
) {
838 ralloc_vasprintf_append(&no16_msg
, format
, va
);
840 no16_msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
848 fs_visitor::emit(enum opcode opcode
)
850 return emit(new(mem_ctx
) fs_inst(opcode
, dispatch_width
));
854 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
)
856 return emit(new(mem_ctx
) fs_inst(opcode
, dst
));
860 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
)
862 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
));
866 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
869 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
, src1
));
873 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
, const fs_reg
&src0
,
874 const fs_reg
&src1
, const fs_reg
&src2
)
876 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src0
, src1
, src2
));
880 fs_visitor::emit(enum opcode opcode
, const fs_reg
&dst
,
881 fs_reg src
[], int sources
)
883 return emit(new(mem_ctx
) fs_inst(opcode
, dst
, src
, sources
));
887 * Returns true if the instruction has a flag that means it won't
888 * update an entire destination register.
890 * For example, dead code elimination and live variable analysis want to know
891 * when a write to a variable screens off any preceding values that were in
895 fs_inst::is_partial_write() const
897 return ((this->predicate
&& this->opcode
!= BRW_OPCODE_SEL
) ||
898 (this->dst
.width
* type_sz(this->dst
.type
)) < 32 ||
899 !this->dst
.is_contiguous());
903 fs_inst::regs_read(fs_visitor
*v
, int arg
) const
905 if (is_tex() && arg
== 0 && src
[0].file
== GRF
) {
907 } else if (opcode
== FS_OPCODE_FB_WRITE
&& arg
== 0) {
909 } else if (opcode
== SHADER_OPCODE_URB_WRITE_SIMD8
&& arg
== 0) {
911 } else if (opcode
== SHADER_OPCODE_UNTYPED_ATOMIC
&& arg
== 0) {
913 } else if (opcode
== SHADER_OPCODE_UNTYPED_SURFACE_READ
&& arg
== 0) {
915 } else if (opcode
== FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
&& arg
== 0) {
919 switch (src
[arg
].file
) {
926 if (src
[arg
].stride
== 0) {
929 int size
= src
[arg
].width
* src
[arg
].stride
* type_sz(src
[arg
].type
);
930 return (size
+ 31) / 32;
933 unreachable("MRF registers are not allowed as sources");
935 unreachable("Invalid register file");
940 fs_inst::reads_flag() const
946 fs_inst::writes_flag() const
948 return (conditional_mod
&& (opcode
!= BRW_OPCODE_SEL
&&
949 opcode
!= BRW_OPCODE_IF
&&
950 opcode
!= BRW_OPCODE_WHILE
)) ||
951 opcode
== FS_OPCODE_MOV_DISPATCH_TO_FLAGS
;
955 * Returns how many MRFs an FS opcode will write over.
957 * Note that this is not the 0 or 1 implied writes in an actual gen
958 * instruction -- the FS opcodes often generate MOVs in addition.
961 fs_visitor::implied_mrf_writes(fs_inst
*inst
)
966 if (inst
->base_mrf
== -1)
969 switch (inst
->opcode
) {
970 case SHADER_OPCODE_RCP
:
971 case SHADER_OPCODE_RSQ
:
972 case SHADER_OPCODE_SQRT
:
973 case SHADER_OPCODE_EXP2
:
974 case SHADER_OPCODE_LOG2
:
975 case SHADER_OPCODE_SIN
:
976 case SHADER_OPCODE_COS
:
977 return 1 * dispatch_width
/ 8;
978 case SHADER_OPCODE_POW
:
979 case SHADER_OPCODE_INT_QUOTIENT
:
980 case SHADER_OPCODE_INT_REMAINDER
:
981 return 2 * dispatch_width
/ 8;
982 case SHADER_OPCODE_TEX
:
984 case SHADER_OPCODE_TXD
:
985 case SHADER_OPCODE_TXF
:
986 case SHADER_OPCODE_TXF_CMS
:
987 case SHADER_OPCODE_TXF_MCS
:
988 case SHADER_OPCODE_TG4
:
989 case SHADER_OPCODE_TG4_OFFSET
:
990 case SHADER_OPCODE_TXL
:
991 case SHADER_OPCODE_TXS
:
992 case SHADER_OPCODE_LOD
:
994 case FS_OPCODE_FB_WRITE
:
996 case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
:
997 case SHADER_OPCODE_GEN4_SCRATCH_READ
:
999 case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD
:
1001 case SHADER_OPCODE_GEN4_SCRATCH_WRITE
:
1003 case SHADER_OPCODE_UNTYPED_ATOMIC
:
1004 case SHADER_OPCODE_UNTYPED_SURFACE_READ
:
1005 case SHADER_OPCODE_URB_WRITE_SIMD8
:
1006 case FS_OPCODE_INTERPOLATE_AT_CENTROID
:
1007 case FS_OPCODE_INTERPOLATE_AT_SAMPLE
:
1008 case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
:
1009 case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
:
1012 unreachable("not reached");
1017 fs_visitor::virtual_grf_alloc(int size
)
1019 if (virtual_grf_array_size
<= virtual_grf_count
) {
1020 if (virtual_grf_array_size
== 0)
1021 virtual_grf_array_size
= 16;
1023 virtual_grf_array_size
*= 2;
1024 virtual_grf_sizes
= reralloc(mem_ctx
, virtual_grf_sizes
, int,
1025 virtual_grf_array_size
);
1027 virtual_grf_sizes
[virtual_grf_count
] = size
;
1028 return virtual_grf_count
++;
1032 fs_visitor::vgrf(const glsl_type
*const type
)
1034 int reg_width
= dispatch_width
/ 8;
1035 return fs_reg(GRF
, virtual_grf_alloc(type_size(type
) * reg_width
),
1036 brw_type_for_base_type(type
), dispatch_width
);
1040 fs_visitor::vgrf(int num_components
)
1042 int reg_width
= dispatch_width
/ 8;
1043 return fs_reg(GRF
, virtual_grf_alloc(num_components
* reg_width
),
1044 BRW_REGISTER_TYPE_F
, dispatch_width
);
1047 /** Fixed HW reg constructor. */
1048 fs_reg::fs_reg(enum register_file file
, int reg
)
1053 this->type
= BRW_REGISTER_TYPE_F
;
1064 /** Fixed HW reg constructor. */
1065 fs_reg::fs_reg(enum register_file file
, int reg
, enum brw_reg_type type
)
1081 /** Fixed HW reg constructor. */
1082 fs_reg::fs_reg(enum register_file file
, int reg
, enum brw_reg_type type
,
1089 this->width
= width
;
1093 fs_visitor::variable_storage(ir_variable
*var
)
1095 return (fs_reg
*)hash_table_find(this->variable_ht
, var
);
1099 import_uniforms_callback(const void *key
,
1103 struct hash_table
*dst_ht
= (struct hash_table
*)closure
;
1104 const fs_reg
*reg
= (const fs_reg
*)data
;
1106 if (reg
->file
!= UNIFORM
)
1109 hash_table_insert(dst_ht
, data
, key
);
1112 /* For SIMD16, we need to follow from the uniform setup of SIMD8 dispatch.
1113 * This brings in those uniform definitions
1116 fs_visitor::import_uniforms(fs_visitor
*v
)
1118 hash_table_call_foreach(v
->variable_ht
,
1119 import_uniforms_callback
,
1121 this->push_constant_loc
= v
->push_constant_loc
;
1122 this->pull_constant_loc
= v
->pull_constant_loc
;
1123 this->uniforms
= v
->uniforms
;
1124 this->param_size
= v
->param_size
;
1127 /* Our support for uniforms is piggy-backed on the struct
1128 * gl_fragment_program, because that's where the values actually
1129 * get stored, rather than in some global gl_shader_program uniform
1133 fs_visitor::setup_uniform_values(ir_variable
*ir
)
1135 int namelen
= strlen(ir
->name
);
1137 /* The data for our (non-builtin) uniforms is stored in a series of
1138 * gl_uniform_driver_storage structs for each subcomponent that
1139 * glGetUniformLocation() could name. We know it's been set up in the same
1140 * order we'd walk the type, so walk the list of storage and find anything
1141 * with our name, or the prefix of a component that starts with our name.
1143 unsigned params_before
= uniforms
;
1144 for (unsigned u
= 0; u
< shader_prog
->NumUserUniformStorage
; u
++) {
1145 struct gl_uniform_storage
*storage
= &shader_prog
->UniformStorage
[u
];
1147 if (strncmp(ir
->name
, storage
->name
, namelen
) != 0 ||
1148 (storage
->name
[namelen
] != 0 &&
1149 storage
->name
[namelen
] != '.' &&
1150 storage
->name
[namelen
] != '[')) {
1154 unsigned slots
= storage
->type
->component_slots();
1155 if (storage
->array_elements
)
1156 slots
*= storage
->array_elements
;
1158 for (unsigned i
= 0; i
< slots
; i
++) {
1159 stage_prog_data
->param
[uniforms
++] = &storage
->storage
[i
];
1163 /* Make sure we actually initialized the right amount of stuff here. */
1164 assert(params_before
+ ir
->type
->component_slots() == uniforms
);
1165 (void)params_before
;
1169 /* Our support for builtin uniforms is even scarier than non-builtin.
1170 * It sits on top of the PROG_STATE_VAR parameters that are
1171 * automatically updated from GL context state.
1174 fs_visitor::setup_builtin_uniform_values(ir_variable
*ir
)
1176 const ir_state_slot
*const slots
= ir
->get_state_slots();
1177 assert(slots
!= NULL
);
1179 for (unsigned int i
= 0; i
< ir
->get_num_state_slots(); i
++) {
1180 /* This state reference has already been setup by ir_to_mesa, but we'll
1181 * get the same index back here.
1183 int index
= _mesa_add_state_reference(this->prog
->Parameters
,
1184 (gl_state_index
*)slots
[i
].tokens
);
1186 /* Add each of the unique swizzles of the element as a parameter.
1187 * This'll end up matching the expected layout of the
1188 * array/matrix/structure we're trying to fill in.
1191 for (unsigned int j
= 0; j
< 4; j
++) {
1192 int swiz
= GET_SWZ(slots
[i
].swizzle
, j
);
1193 if (swiz
== last_swiz
)
1197 stage_prog_data
->param
[uniforms
++] =
1198 &prog
->Parameters
->ParameterValues
[index
][swiz
];
1204 fs_visitor::emit_fragcoord_interpolation(bool pixel_center_integer
,
1205 bool origin_upper_left
)
1207 assert(stage
== MESA_SHADER_FRAGMENT
);
1208 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1209 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec4_type
));
1211 bool flip
= !origin_upper_left
^ key
->render_to_fbo
;
1213 /* gl_FragCoord.x */
1214 if (pixel_center_integer
) {
1215 emit(MOV(wpos
, this->pixel_x
));
1217 emit(ADD(wpos
, this->pixel_x
, fs_reg(0.5f
)));
1219 wpos
= offset(wpos
, 1);
1221 /* gl_FragCoord.y */
1222 if (!flip
&& pixel_center_integer
) {
1223 emit(MOV(wpos
, this->pixel_y
));
1225 fs_reg pixel_y
= this->pixel_y
;
1226 float offset
= (pixel_center_integer
? 0.0 : 0.5);
1229 pixel_y
.negate
= true;
1230 offset
+= key
->drawable_height
- 1.0;
1233 emit(ADD(wpos
, pixel_y
, fs_reg(offset
)));
1235 wpos
= offset(wpos
, 1);
1237 /* gl_FragCoord.z */
1238 if (brw
->gen
>= 6) {
1239 emit(MOV(wpos
, fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0))));
1241 emit(FS_OPCODE_LINTERP
, wpos
,
1242 this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
1243 this->delta_y
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
],
1244 interp_reg(VARYING_SLOT_POS
, 2));
1246 wpos
= offset(wpos
, 1);
1248 /* gl_FragCoord.w: Already set up in emit_interpolation */
1249 emit(BRW_OPCODE_MOV
, wpos
, this->wpos_w
);
1255 fs_visitor::emit_linterp(const fs_reg
&attr
, const fs_reg
&interp
,
1256 glsl_interp_qualifier interpolation_mode
,
1257 bool is_centroid
, bool is_sample
)
1259 brw_wm_barycentric_interp_mode barycoord_mode
;
1260 if (brw
->gen
>= 6) {
1262 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1263 barycoord_mode
= BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC
;
1265 barycoord_mode
= BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC
;
1266 } else if (is_sample
) {
1267 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1268 barycoord_mode
= BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC
;
1270 barycoord_mode
= BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC
;
1272 if (interpolation_mode
== INTERP_QUALIFIER_SMOOTH
)
1273 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1275 barycoord_mode
= BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC
;
1278 /* On Ironlake and below, there is only one interpolation mode.
1279 * Centroid interpolation doesn't mean anything on this hardware --
1280 * there is no multisampling.
1282 barycoord_mode
= BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
;
1284 return emit(FS_OPCODE_LINTERP
, attr
,
1285 this->delta_x
[barycoord_mode
],
1286 this->delta_y
[barycoord_mode
], interp
);
1290 fs_visitor::emit_general_interpolation(fs_reg attr
, const char *name
,
1291 const glsl_type
*type
,
1292 glsl_interp_qualifier interpolation_mode
,
1293 int location
, bool mod_centroid
,
1296 attr
.type
= brw_type_for_base_type(type
->get_scalar_type());
1298 assert(stage
== MESA_SHADER_FRAGMENT
);
1299 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1300 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1302 unsigned int array_elements
;
1304 if (type
->is_array()) {
1305 array_elements
= type
->length
;
1306 if (array_elements
== 0) {
1307 fail("dereferenced array '%s' has length 0\n", name
);
1309 type
= type
->fields
.array
;
1314 if (interpolation_mode
== INTERP_QUALIFIER_NONE
) {
1316 location
== VARYING_SLOT_COL0
|| location
== VARYING_SLOT_COL1
;
1317 if (key
->flat_shade
&& is_gl_Color
) {
1318 interpolation_mode
= INTERP_QUALIFIER_FLAT
;
1320 interpolation_mode
= INTERP_QUALIFIER_SMOOTH
;
1324 for (unsigned int i
= 0; i
< array_elements
; i
++) {
1325 for (unsigned int j
= 0; j
< type
->matrix_columns
; j
++) {
1326 if (prog_data
->urb_setup
[location
] == -1) {
1327 /* If there's no incoming setup data for this slot, don't
1328 * emit interpolation for it.
1330 attr
= offset(attr
, type
->vector_elements
);
1335 if (interpolation_mode
== INTERP_QUALIFIER_FLAT
) {
1336 /* Constant interpolation (flat shading) case. The SF has
1337 * handed us defined values in only the constant offset
1338 * field of the setup reg.
1340 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1341 struct brw_reg interp
= interp_reg(location
, k
);
1342 interp
= suboffset(interp
, 3);
1343 interp
.type
= attr
.type
;
1344 emit(FS_OPCODE_CINTERP
, attr
, fs_reg(interp
));
1345 attr
= offset(attr
, 1);
1348 /* Smooth/noperspective interpolation case. */
1349 for (unsigned int k
= 0; k
< type
->vector_elements
; k
++) {
1350 struct brw_reg interp
= interp_reg(location
, k
);
1351 if (brw
->needs_unlit_centroid_workaround
&& mod_centroid
) {
1352 /* Get the pixel/sample mask into f0 so that we know
1353 * which pixels are lit. Then, for each channel that is
1354 * unlit, replace the centroid data with non-centroid
1357 emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
1360 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1362 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1363 inst
->predicate_inverse
= true;
1365 inst
->no_dd_clear
= true;
1367 inst
= emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1368 mod_centroid
&& !key
->persample_shading
,
1369 mod_sample
|| key
->persample_shading
);
1370 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1371 inst
->predicate_inverse
= false;
1373 inst
->no_dd_check
= true;
1376 emit_linterp(attr
, fs_reg(interp
), interpolation_mode
,
1377 mod_centroid
&& !key
->persample_shading
,
1378 mod_sample
|| key
->persample_shading
);
1380 if (brw
->gen
< 6 && interpolation_mode
== INTERP_QUALIFIER_SMOOTH
) {
1381 emit(BRW_OPCODE_MUL
, attr
, attr
, this->pixel_w
);
1383 attr
= offset(attr
, 1);
1393 fs_visitor::emit_frontfacing_interpolation()
1395 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::bool_type
));
1397 if (brw
->gen
>= 6) {
1398 /* Bit 15 of g0.0 is 0 if the polygon is front facing. We want to create
1399 * a boolean result from this (~0/true or 0/false).
1401 * We can use the fact that bit 15 is the MSB of g0.0:W to accomplish
1402 * this task in only one instruction:
1403 * - a negation source modifier will flip the bit; and
1404 * - a W -> D type conversion will sign extend the bit into the high
1405 * word of the destination.
1407 * An ASR 15 fills the low word of the destination.
1409 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
1412 emit(ASR(*reg
, g0
, fs_reg(15)));
1414 /* Bit 31 of g1.6 is 0 if the polygon is front facing. We want to create
1415 * a boolean result from this (1/true or 0/false).
1417 * Like in the above case, since the bit is the MSB of g1.6:UD we can use
1418 * the negation source modifier to flip it. Unfortunately the SHR
1419 * instruction only operates on UD (or D with an abs source modifier)
1420 * sources without negation.
1422 * Instead, use ASR (which will give ~0/true or 0/false).
1424 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
1427 emit(ASR(*reg
, g1_6
, fs_reg(31)));
1434 fs_visitor::compute_sample_position(fs_reg dst
, fs_reg int_sample_pos
)
1436 assert(stage
== MESA_SHADER_FRAGMENT
);
1437 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1438 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
1440 if (key
->compute_pos_offset
) {
1441 /* Convert int_sample_pos to floating point */
1442 emit(MOV(dst
, int_sample_pos
));
1443 /* Scale to the range [0, 1] */
1444 emit(MUL(dst
, dst
, fs_reg(1 / 16.0f
)));
1447 /* From ARB_sample_shading specification:
1448 * "When rendering to a non-multisample buffer, or if multisample
1449 * rasterization is disabled, gl_SamplePosition will always be
1452 emit(MOV(dst
, fs_reg(0.5f
)));
1457 fs_visitor::emit_samplepos_setup()
1459 assert(brw
->gen
>= 6);
1461 this->current_annotation
= "compute sample position";
1462 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::vec2_type
));
1464 fs_reg int_sample_x
= vgrf(glsl_type::int_type
);
1465 fs_reg int_sample_y
= vgrf(glsl_type::int_type
);
1467 /* WM will be run in MSDISPMODE_PERSAMPLE. So, only one of SIMD8 or SIMD16
1468 * mode will be enabled.
1470 * From the Ivy Bridge PRM, volume 2 part 1, page 344:
1471 * R31.1:0 Position Offset X/Y for Slot[3:0]
1472 * R31.3:2 Position Offset X/Y for Slot[7:4]
1475 * The X, Y sample positions come in as bytes in thread payload. So, read
1476 * the positions using vstride=16, width=8, hstride=2.
1478 struct brw_reg sample_pos_reg
=
1479 stride(retype(brw_vec1_grf(payload
.sample_pos_reg
, 0),
1480 BRW_REGISTER_TYPE_B
), 16, 8, 2);
1482 if (dispatch_width
== 8) {
1483 emit(MOV(int_sample_x
, fs_reg(sample_pos_reg
)));
1485 emit(MOV(half(int_sample_x
, 0), fs_reg(sample_pos_reg
)));
1486 emit(MOV(half(int_sample_x
, 1), fs_reg(suboffset(sample_pos_reg
, 16))))
1487 ->force_sechalf
= true;
1489 /* Compute gl_SamplePosition.x */
1490 compute_sample_position(pos
, int_sample_x
);
1491 pos
= offset(pos
, 1);
1492 if (dispatch_width
== 8) {
1493 emit(MOV(int_sample_y
, fs_reg(suboffset(sample_pos_reg
, 1))));
1495 emit(MOV(half(int_sample_y
, 0),
1496 fs_reg(suboffset(sample_pos_reg
, 1))));
1497 emit(MOV(half(int_sample_y
, 1), fs_reg(suboffset(sample_pos_reg
, 17))))
1498 ->force_sechalf
= true;
1500 /* Compute gl_SamplePosition.y */
1501 compute_sample_position(pos
, int_sample_y
);
1506 fs_visitor::emit_sampleid_setup()
1508 assert(stage
== MESA_SHADER_FRAGMENT
);
1509 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1510 assert(brw
->gen
>= 6);
1512 this->current_annotation
= "compute sample id";
1513 fs_reg
*reg
= new(this->mem_ctx
) fs_reg(vgrf(glsl_type::int_type
));
1515 if (key
->compute_sample_id
) {
1516 fs_reg t1
= vgrf(glsl_type::int_type
);
1517 fs_reg t2
= vgrf(glsl_type::int_type
);
1518 t2
.type
= BRW_REGISTER_TYPE_UW
;
1520 /* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
1521 * 8x multisampling, subspan 0 will represent sample N (where N
1522 * is 0, 2, 4 or 6), subspan 1 will represent sample 1, 3, 5 or
1523 * 7. We can find the value of N by looking at R0.0 bits 7:6
1524 * ("Starting Sample Pair Index (SSPI)") and multiplying by two
1525 * (since samples are always delivered in pairs). That is, we
1526 * compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 & 0xc0) >> 5. Then
1527 * we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1) in
1528 * case of SIMD8 and sequence (0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
1529 * 2, 3, 3, 3, 3) in case of SIMD16. We compute this sequence by
1530 * populating a temporary variable with the sequence (0, 1, 2, 3),
1531 * and then reading from it using vstride=1, width=4, hstride=0.
1532 * These computations hold good for 4x multisampling as well.
1534 * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1):
1535 * the first four slots are sample 0 of subspan 0; the next four
1536 * are sample 1 of subspan 0; the third group is sample 0 of
1537 * subspan 1, and finally sample 1 of subspan 1.
1540 inst
= emit(BRW_OPCODE_AND
, t1
,
1541 fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)),
1543 inst
->force_writemask_all
= true;
1544 inst
= emit(BRW_OPCODE_SHR
, t1
, t1
, fs_reg(5));
1545 inst
->force_writemask_all
= true;
1546 /* This works for both SIMD8 and SIMD16 */
1547 inst
= emit(MOV(t2
, brw_imm_v(key
->persample_2x
? 0x1010 : 0x3210)));
1548 inst
->force_writemask_all
= true;
1549 /* This special instruction takes care of setting vstride=1,
1550 * width=4, hstride=0 of t2 during an ADD instruction.
1552 emit(FS_OPCODE_SET_SAMPLE_ID
, *reg
, t1
, t2
);
1554 /* As per GL_ARB_sample_shading specification:
1555 * "When rendering to a non-multisample buffer, or if multisample
1556 * rasterization is disabled, gl_SampleID will always be zero."
1558 emit(BRW_OPCODE_MOV
, *reg
, fs_reg(0));
1565 fs_visitor::fix_math_operand(fs_reg src
)
1567 /* Can't do hstride == 0 args on gen6 math, so expand it out. We
1568 * might be able to do better by doing execsize = 1 math and then
1569 * expanding that result out, but we would need to be careful with
1572 * The hardware ignores source modifiers (negate and abs) on math
1573 * instructions, so we also move to a temp to set those up.
1575 if (brw
->gen
== 6 && src
.file
!= UNIFORM
&& src
.file
!= IMM
&&
1576 !src
.abs
&& !src
.negate
)
1579 /* Gen7 relaxes most of the above restrictions, but still can't use IMM
1582 if (brw
->gen
>= 7 && src
.file
!= IMM
)
1585 fs_reg expanded
= vgrf(glsl_type::float_type
);
1586 expanded
.type
= src
.type
;
1587 emit(BRW_OPCODE_MOV
, expanded
, src
);
1592 fs_visitor::emit_math(enum opcode opcode
, fs_reg dst
, fs_reg src
)
1595 case SHADER_OPCODE_RCP
:
1596 case SHADER_OPCODE_RSQ
:
1597 case SHADER_OPCODE_SQRT
:
1598 case SHADER_OPCODE_EXP2
:
1599 case SHADER_OPCODE_LOG2
:
1600 case SHADER_OPCODE_SIN
:
1601 case SHADER_OPCODE_COS
:
1604 unreachable("not reached: bad math opcode");
1607 /* Can't do hstride == 0 args to gen6 math, so expand it out. We
1608 * might be able to do better by doing execsize = 1 math and then
1609 * expanding that result out, but we would need to be careful with
1612 * Gen 6 hardware ignores source modifiers (negate and abs) on math
1613 * instructions, so we also move to a temp to set those up.
1615 if (brw
->gen
== 6 || brw
->gen
== 7)
1616 src
= fix_math_operand(src
);
1618 fs_inst
*inst
= emit(opcode
, dst
, src
);
1622 inst
->mlen
= dispatch_width
/ 8;
1629 fs_visitor::emit_math(enum opcode opcode
, fs_reg dst
, fs_reg src0
, fs_reg src1
)
1634 if (brw
->gen
>= 8) {
1635 inst
= emit(opcode
, dst
, src0
, src1
);
1636 } else if (brw
->gen
>= 6) {
1637 src0
= fix_math_operand(src0
);
1638 src1
= fix_math_operand(src1
);
1640 inst
= emit(opcode
, dst
, src0
, src1
);
1642 /* From the Ironlake PRM, Volume 4, Part 1, Section 6.1.13
1643 * "Message Payload":
1645 * "Operand0[7]. For the INT DIV functions, this operand is the
1648 * "Operand1[7]. For the INT DIV functions, this operand is the
1651 bool is_int_div
= opcode
!= SHADER_OPCODE_POW
;
1652 fs_reg
&op0
= is_int_div
? src1
: src0
;
1653 fs_reg
&op1
= is_int_div
? src0
: src1
;
1655 emit(MOV(fs_reg(MRF
, base_mrf
+ 1, op1
.type
, dispatch_width
), op1
));
1656 inst
= emit(opcode
, dst
, op0
, reg_null_f
);
1658 inst
->base_mrf
= base_mrf
;
1659 inst
->mlen
= 2 * dispatch_width
/ 8;
1665 fs_visitor::assign_curb_setup()
1667 if (dispatch_width
== 8) {
1668 prog_data
->dispatch_grf_start_reg
= payload
.num_regs
;
1670 assert(stage
== MESA_SHADER_FRAGMENT
);
1671 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1672 prog_data
->dispatch_grf_start_reg_16
= payload
.num_regs
;
1675 prog_data
->curb_read_length
= ALIGN(stage_prog_data
->nr_params
, 8) / 8;
1677 /* Map the offsets in the UNIFORM file to fixed HW regs. */
1678 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1679 for (unsigned int i
= 0; i
< inst
->sources
; i
++) {
1680 if (inst
->src
[i
].file
== UNIFORM
) {
1681 int uniform_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
1683 if (uniform_nr
>= 0 && uniform_nr
< (int) uniforms
) {
1684 constant_nr
= push_constant_loc
[uniform_nr
];
1686 /* Section 5.11 of the OpenGL 4.1 spec says:
1687 * "Out-of-bounds reads return undefined values, which include
1688 * values from other variables of the active program or zero."
1689 * Just return the first push constant.
1694 struct brw_reg brw_reg
= brw_vec1_grf(payload
.num_regs
+
1698 inst
->src
[i
].file
= HW_REG
;
1699 inst
->src
[i
].fixed_hw_reg
= byte_offset(
1700 retype(brw_reg
, inst
->src
[i
].type
),
1701 inst
->src
[i
].subreg_offset
);
1708 fs_visitor::calculate_urb_setup()
1710 assert(stage
== MESA_SHADER_FRAGMENT
);
1711 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1712 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
1714 memset(prog_data
->urb_setup
, -1,
1715 sizeof(prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
1718 /* Figure out where each of the incoming setup attributes lands. */
1719 if (brw
->gen
>= 6) {
1720 if (_mesa_bitcount_64(prog
->InputsRead
&
1721 BRW_FS_VARYING_INPUT_MASK
) <= 16) {
1722 /* The SF/SBE pipeline stage can do arbitrary rearrangement of the
1723 * first 16 varying inputs, so we can put them wherever we want.
1724 * Just put them in order.
1726 * This is useful because it means that (a) inputs not used by the
1727 * fragment shader won't take up valuable register space, and (b) we
1728 * won't have to recompile the fragment shader if it gets paired with
1729 * a different vertex (or geometry) shader.
1731 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1732 if (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1733 BITFIELD64_BIT(i
)) {
1734 prog_data
->urb_setup
[i
] = urb_next
++;
1738 /* We have enough input varyings that the SF/SBE pipeline stage can't
1739 * arbitrarily rearrange them to suit our whim; we have to put them
1740 * in an order that matches the output of the previous pipeline stage
1741 * (geometry or vertex shader).
1743 struct brw_vue_map prev_stage_vue_map
;
1744 brw_compute_vue_map(brw
, &prev_stage_vue_map
,
1745 key
->input_slots_valid
);
1746 int first_slot
= 2 * BRW_SF_URB_ENTRY_READ_OFFSET
;
1747 assert(prev_stage_vue_map
.num_slots
<= first_slot
+ 32);
1748 for (int slot
= first_slot
; slot
< prev_stage_vue_map
.num_slots
;
1750 int varying
= prev_stage_vue_map
.slot_to_varying
[slot
];
1751 /* Note that varying == BRW_VARYING_SLOT_COUNT when a slot is
1754 if (varying
!= BRW_VARYING_SLOT_COUNT
&&
1755 (prog
->InputsRead
& BRW_FS_VARYING_INPUT_MASK
&
1756 BITFIELD64_BIT(varying
))) {
1757 prog_data
->urb_setup
[varying
] = slot
- first_slot
;
1760 urb_next
= prev_stage_vue_map
.num_slots
- first_slot
;
1763 /* FINISHME: The sf doesn't map VS->FS inputs for us very well. */
1764 for (unsigned int i
= 0; i
< VARYING_SLOT_MAX
; i
++) {
1765 /* Point size is packed into the header, not as a general attribute */
1766 if (i
== VARYING_SLOT_PSIZ
)
1769 if (key
->input_slots_valid
& BITFIELD64_BIT(i
)) {
1770 /* The back color slot is skipped when the front color is
1771 * also written to. In addition, some slots can be
1772 * written in the vertex shader and not read in the
1773 * fragment shader. So the register number must always be
1774 * incremented, mapped or not.
1776 if (_mesa_varying_slot_in_fs((gl_varying_slot
) i
))
1777 prog_data
->urb_setup
[i
] = urb_next
;
1783 * It's a FS only attribute, and we did interpolation for this attribute
1784 * in SF thread. So, count it here, too.
1786 * See compile_sf_prog() for more info.
1788 if (prog
->InputsRead
& BITFIELD64_BIT(VARYING_SLOT_PNTC
))
1789 prog_data
->urb_setup
[VARYING_SLOT_PNTC
] = urb_next
++;
1792 prog_data
->num_varying_inputs
= urb_next
;
1796 fs_visitor::assign_urb_setup()
1798 assert(stage
== MESA_SHADER_FRAGMENT
);
1799 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
1801 int urb_start
= payload
.num_regs
+ prog_data
->base
.curb_read_length
;
1803 /* Offset all the urb_setup[] index by the actual position of the
1804 * setup regs, now that the location of the constants has been chosen.
1806 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1807 if (inst
->opcode
== FS_OPCODE_LINTERP
) {
1808 assert(inst
->src
[2].file
== HW_REG
);
1809 inst
->src
[2].fixed_hw_reg
.nr
+= urb_start
;
1812 if (inst
->opcode
== FS_OPCODE_CINTERP
) {
1813 assert(inst
->src
[0].file
== HW_REG
);
1814 inst
->src
[0].fixed_hw_reg
.nr
+= urb_start
;
1818 /* Each attribute is 4 setup channels, each of which is half a reg. */
1819 this->first_non_payload_grf
=
1820 urb_start
+ prog_data
->num_varying_inputs
* 2;
1824 fs_visitor::assign_vs_urb_setup()
1826 brw_vs_prog_data
*vs_prog_data
= (brw_vs_prog_data
*) prog_data
;
1827 int grf
, count
, slot
, channel
, attr
;
1829 assert(stage
== MESA_SHADER_VERTEX
);
1830 count
= _mesa_bitcount_64(vs_prog_data
->inputs_read
);
1831 if (vs_prog_data
->uses_vertexid
|| vs_prog_data
->uses_instanceid
)
1834 /* Each attribute is 4 regs. */
1835 this->first_non_payload_grf
=
1836 payload
.num_regs
+ prog_data
->curb_read_length
+ count
* 4;
1838 unsigned vue_entries
=
1839 MAX2(count
, vs_prog_data
->base
.vue_map
.num_slots
);
1841 vs_prog_data
->base
.urb_entry_size
= ALIGN(vue_entries
, 4) / 4;
1842 vs_prog_data
->base
.urb_read_length
= (count
+ 1) / 2;
1844 assert(vs_prog_data
->base
.urb_read_length
<= 15);
1846 /* Rewrite all ATTR file references to the hw grf that they land in. */
1847 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1848 for (int i
= 0; i
< inst
->sources
; i
++) {
1849 if (inst
->src
[i
].file
== ATTR
) {
1851 if (inst
->src
[i
].reg
== VERT_ATTRIB_MAX
) {
1854 /* Attributes come in in a contiguous block, ordered by their
1855 * gl_vert_attrib value. That means we can compute the slot
1856 * number for an attribute by masking out the enabled
1857 * attributes before it and counting the bits.
1859 attr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
/ 4;
1860 slot
= _mesa_bitcount_64(vs_prog_data
->inputs_read
&
1861 BITFIELD64_MASK(attr
));
1864 channel
= inst
->src
[i
].reg_offset
& 3;
1866 grf
= payload
.num_regs
+
1867 prog_data
->curb_read_length
+
1870 inst
->src
[i
].file
= HW_REG
;
1871 inst
->src
[i
].fixed_hw_reg
=
1872 retype(brw_vec8_grf(grf
, 0), inst
->src
[i
].type
);
1879 * Split large virtual GRFs into separate components if we can.
1881 * This is mostly duplicated with what brw_fs_vector_splitting does,
1882 * but that's really conservative because it's afraid of doing
1883 * splitting that doesn't result in real progress after the rest of
1884 * the optimization phases, which would cause infinite looping in
1885 * optimization. We can do it once here, safely. This also has the
1886 * opportunity to split interpolated values, or maybe even uniforms,
1887 * which we don't have at the IR level.
1889 * We want to split, because virtual GRFs are what we register
1890 * allocate and spill (due to contiguousness requirements for some
1891 * instructions), and they're what we naturally generate in the
1892 * codegen process, but most virtual GRFs don't actually need to be
1893 * contiguous sets of GRFs. If we split, we'll end up with reduced
1894 * live intervals and better dead code elimination and coalescing.
1897 fs_visitor::split_virtual_grfs()
1899 int num_vars
= this->virtual_grf_count
;
1901 /* Count the total number of registers */
1903 int vgrf_to_reg
[num_vars
];
1904 for (int i
= 0; i
< num_vars
; i
++) {
1905 vgrf_to_reg
[i
] = reg_count
;
1906 reg_count
+= virtual_grf_sizes
[i
];
1909 /* An array of "split points". For each register slot, this indicates
1910 * if this slot can be separated from the previous slot. Every time an
1911 * instruction uses multiple elements of a register (as a source or
1912 * destination), we mark the used slots as inseparable. Then we go
1913 * through and split the registers into the smallest pieces we can.
1915 bool split_points
[reg_count
];
1916 memset(split_points
, 0, sizeof(split_points
));
1918 /* Mark all used registers as fully splittable */
1919 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1920 if (inst
->dst
.file
== GRF
) {
1921 int reg
= vgrf_to_reg
[inst
->dst
.reg
];
1922 for (int j
= 1; j
< this->virtual_grf_sizes
[inst
->dst
.reg
]; j
++)
1923 split_points
[reg
+ j
] = true;
1926 for (int i
= 0; i
< inst
->sources
; i
++) {
1927 if (inst
->src
[i
].file
== GRF
) {
1928 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
];
1929 for (int j
= 1; j
< this->virtual_grf_sizes
[inst
->src
[i
].reg
]; j
++)
1930 split_points
[reg
+ j
] = true;
1936 this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
].file
== GRF
) {
1937 /* PLN opcodes rely on the delta_xy being contiguous. We only have to
1938 * check this for BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC, because prior to
1939 * Gen6, that was the only supported interpolation mode, and since Gen6,
1940 * delta_x and delta_y are in fixed hardware registers.
1942 int vgrf
= this->delta_x
[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC
].reg
;
1943 split_points
[vgrf_to_reg
[vgrf
] + 1] = false;
1946 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
1947 if (inst
->dst
.file
== GRF
) {
1948 int reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
1949 for (int j
= 1; j
< inst
->regs_written
; j
++)
1950 split_points
[reg
+ j
] = false;
1952 for (int i
= 0; i
< inst
->sources
; i
++) {
1953 if (inst
->src
[i
].file
== GRF
) {
1954 int reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
1955 for (int j
= 1; j
< inst
->regs_read(this, i
); j
++)
1956 split_points
[reg
+ j
] = false;
1961 int new_virtual_grf
[reg_count
];
1962 int new_reg_offset
[reg_count
];
1965 for (int i
= 0; i
< num_vars
; i
++) {
1966 /* The first one should always be 0 as a quick sanity check. */
1967 assert(split_points
[reg
] == false);
1970 new_reg_offset
[reg
] = 0;
1975 for (int j
= 1; j
< virtual_grf_sizes
[i
]; j
++) {
1976 /* If this is a split point, reset the offset to 0 and allocate a
1977 * new virtual GRF for the previous offset many registers
1979 if (split_points
[reg
]) {
1980 assert(offset
<= MAX_VGRF_SIZE
);
1981 int grf
= virtual_grf_alloc(offset
);
1982 for (int k
= reg
- offset
; k
< reg
; k
++)
1983 new_virtual_grf
[k
] = grf
;
1986 new_reg_offset
[reg
] = offset
;
1991 /* The last one gets the original register number */
1992 assert(offset
<= MAX_VGRF_SIZE
);
1993 virtual_grf_sizes
[i
] = offset
;
1994 for (int k
= reg
- offset
; k
< reg
; k
++)
1995 new_virtual_grf
[k
] = i
;
1997 assert(reg
== reg_count
);
1999 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2000 if (inst
->dst
.file
== GRF
) {
2001 reg
= vgrf_to_reg
[inst
->dst
.reg
] + inst
->dst
.reg_offset
;
2002 inst
->dst
.reg
= new_virtual_grf
[reg
];
2003 inst
->dst
.reg_offset
= new_reg_offset
[reg
];
2004 assert(new_reg_offset
[reg
] < virtual_grf_sizes
[new_virtual_grf
[reg
]]);
2006 for (int i
= 0; i
< inst
->sources
; i
++) {
2007 if (inst
->src
[i
].file
== GRF
) {
2008 reg
= vgrf_to_reg
[inst
->src
[i
].reg
] + inst
->src
[i
].reg_offset
;
2009 inst
->src
[i
].reg
= new_virtual_grf
[reg
];
2010 inst
->src
[i
].reg_offset
= new_reg_offset
[reg
];
2011 assert(new_reg_offset
[reg
] < virtual_grf_sizes
[new_virtual_grf
[reg
]]);
2015 invalidate_live_intervals();
2019 * Remove unused virtual GRFs and compact the virtual_grf_* arrays.
2021 * During code generation, we create tons of temporary variables, many of
2022 * which get immediately killed and are never used again. Yet, in later
2023 * optimization and analysis passes, such as compute_live_intervals, we need
2024 * to loop over all the virtual GRFs. Compacting them can save a lot of
2028 fs_visitor::compact_virtual_grfs()
2030 bool progress
= false;
2031 int remap_table
[this->virtual_grf_count
];
2032 memset(remap_table
, -1, sizeof(remap_table
));
2034 /* Mark which virtual GRFs are used. */
2035 foreach_block_and_inst(block
, const fs_inst
, inst
, cfg
) {
2036 if (inst
->dst
.file
== GRF
)
2037 remap_table
[inst
->dst
.reg
] = 0;
2039 for (int i
= 0; i
< inst
->sources
; i
++) {
2040 if (inst
->src
[i
].file
== GRF
)
2041 remap_table
[inst
->src
[i
].reg
] = 0;
2045 /* Compact the GRF arrays. */
2047 for (int i
= 0; i
< this->virtual_grf_count
; i
++) {
2048 if (remap_table
[i
] == -1) {
2049 /* We just found an unused register. This means that we are
2050 * actually going to compact something.
2054 remap_table
[i
] = new_index
;
2055 virtual_grf_sizes
[new_index
] = virtual_grf_sizes
[i
];
2056 invalidate_live_intervals();
2061 this->virtual_grf_count
= new_index
;
2063 /* Patch all the instructions to use the newly renumbered registers */
2064 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2065 if (inst
->dst
.file
== GRF
)
2066 inst
->dst
.reg
= remap_table
[inst
->dst
.reg
];
2068 for (int i
= 0; i
< inst
->sources
; i
++) {
2069 if (inst
->src
[i
].file
== GRF
)
2070 inst
->src
[i
].reg
= remap_table
[inst
->src
[i
].reg
];
2074 /* Patch all the references to delta_x/delta_y, since they're used in
2075 * register allocation. If they're unused, switch them to BAD_FILE so
2076 * we don't think some random VGRF is delta_x/delta_y.
2078 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_x
); i
++) {
2079 if (delta_x
[i
].file
== GRF
) {
2080 if (remap_table
[delta_x
[i
].reg
] != -1) {
2081 delta_x
[i
].reg
= remap_table
[delta_x
[i
].reg
];
2083 delta_x
[i
].file
= BAD_FILE
;
2087 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_y
); i
++) {
2088 if (delta_y
[i
].file
== GRF
) {
2089 if (remap_table
[delta_y
[i
].reg
] != -1) {
2090 delta_y
[i
].reg
= remap_table
[delta_y
[i
].reg
];
2092 delta_y
[i
].file
= BAD_FILE
;
2101 * Implements array access of uniforms by inserting a
2102 * PULL_CONSTANT_LOAD instruction.
2104 * Unlike temporary GRF array access (where we don't support it due to
2105 * the difficulty of doing relative addressing on instruction
2106 * destinations), we could potentially do array access of uniforms
2107 * that were loaded in GRF space as push constants. In real-world
2108 * usage we've seen, though, the arrays being used are always larger
2109 * than we could load as push constants, so just always move all
2110 * uniform array access out to a pull constant buffer.
2113 fs_visitor::move_uniform_array_access_to_pull_constants()
2115 if (dispatch_width
!= 8)
2118 pull_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2119 memset(pull_constant_loc
, -1, sizeof(pull_constant_loc
[0]) * uniforms
);
2121 /* Walk through and find array access of uniforms. Put a copy of that
2122 * uniform in the pull constant buffer.
2124 * Note that we don't move constant-indexed accesses to arrays. No
2125 * testing has been done of the performance impact of this choice.
2127 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2128 for (int i
= 0 ; i
< inst
->sources
; i
++) {
2129 if (inst
->src
[i
].file
!= UNIFORM
|| !inst
->src
[i
].reladdr
)
2132 int uniform
= inst
->src
[i
].reg
;
2134 /* If this array isn't already present in the pull constant buffer,
2137 if (pull_constant_loc
[uniform
] == -1) {
2138 const gl_constant_value
**values
= &stage_prog_data
->param
[uniform
];
2140 assert(param_size
[uniform
]);
2142 for (int j
= 0; j
< param_size
[uniform
]; j
++) {
2143 pull_constant_loc
[uniform
+ j
] = stage_prog_data
->nr_pull_params
;
2145 stage_prog_data
->pull_param
[stage_prog_data
->nr_pull_params
++] =
2154 * Assign UNIFORM file registers to either push constants or pull constants.
2156 * We allow a fragment shader to have more than the specified minimum
2157 * maximum number of fragment shader uniform components (64). If
2158 * there are too many of these, they'd fill up all of register space.
2159 * So, this will push some of them out to the pull constant buffer and
2160 * update the program to load them.
2163 fs_visitor::assign_constant_locations()
2165 /* Only the first compile (SIMD8 mode) gets to decide on locations. */
2166 if (dispatch_width
!= 8)
2169 /* Find which UNIFORM registers are still in use. */
2170 bool is_live
[uniforms
];
2171 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2175 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2176 for (int i
= 0; i
< inst
->sources
; i
++) {
2177 if (inst
->src
[i
].file
!= UNIFORM
)
2180 int constant_nr
= inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
;
2181 if (constant_nr
>= 0 && constant_nr
< (int) uniforms
)
2182 is_live
[constant_nr
] = true;
2186 /* Only allow 16 registers (128 uniform components) as push constants.
2188 * Just demote the end of the list. We could probably do better
2189 * here, demoting things that are rarely used in the program first.
2191 * If changing this value, note the limitation about total_regs in
2194 unsigned int max_push_components
= 16 * 8;
2195 unsigned int num_push_constants
= 0;
2197 push_constant_loc
= ralloc_array(mem_ctx
, int, uniforms
);
2199 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2200 if (!is_live
[i
] || pull_constant_loc
[i
] != -1) {
2201 /* This UNIFORM register is either dead, or has already been demoted
2202 * to a pull const. Mark it as no longer living in the param[] array.
2204 push_constant_loc
[i
] = -1;
2208 if (num_push_constants
< max_push_components
) {
2209 /* Retain as a push constant. Record the location in the params[]
2212 push_constant_loc
[i
] = num_push_constants
++;
2214 /* Demote to a pull constant. */
2215 push_constant_loc
[i
] = -1;
2217 int pull_index
= stage_prog_data
->nr_pull_params
++;
2218 stage_prog_data
->pull_param
[pull_index
] = stage_prog_data
->param
[i
];
2219 pull_constant_loc
[i
] = pull_index
;
2223 stage_prog_data
->nr_params
= num_push_constants
;
2225 /* Up until now, the param[] array has been indexed by reg + reg_offset
2226 * of UNIFORM registers. Condense it to only contain the uniforms we
2227 * chose to upload as push constants.
2229 for (unsigned int i
= 0; i
< uniforms
; i
++) {
2230 int remapped
= push_constant_loc
[i
];
2235 assert(remapped
<= (int)i
);
2236 stage_prog_data
->param
[remapped
] = stage_prog_data
->param
[i
];
2241 * Replace UNIFORM register file access with either UNIFORM_PULL_CONSTANT_LOAD
2242 * or VARYING_PULL_CONSTANT_LOAD instructions which load values into VGRFs.
2245 fs_visitor::demote_pull_constants()
2247 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
2248 for (int i
= 0; i
< inst
->sources
; i
++) {
2249 if (inst
->src
[i
].file
!= UNIFORM
)
2252 int pull_index
= pull_constant_loc
[inst
->src
[i
].reg
+
2253 inst
->src
[i
].reg_offset
];
2254 if (pull_index
== -1)
2257 /* Set up the annotation tracking for new generated instructions. */
2259 current_annotation
= inst
->annotation
;
2261 fs_reg
surf_index(stage_prog_data
->binding_table
.pull_constants_start
);
2262 fs_reg dst
= vgrf(glsl_type::float_type
);
2264 /* Generate a pull load into dst. */
2265 if (inst
->src
[i
].reladdr
) {
2266 exec_list list
= VARYING_PULL_CONSTANT_LOAD(dst
,
2268 *inst
->src
[i
].reladdr
,
2270 inst
->insert_before(block
, &list
);
2271 inst
->src
[i
].reladdr
= NULL
;
2273 fs_reg offset
= fs_reg((unsigned)(pull_index
* 4) & ~15);
2275 new(mem_ctx
) fs_inst(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
, 8,
2276 dst
, surf_index
, offset
);
2277 inst
->insert_before(block
, pull
);
2278 inst
->src
[i
].set_smear(pull_index
& 3);
2281 /* Rewrite the instruction to use the temporary VGRF. */
2282 inst
->src
[i
].file
= GRF
;
2283 inst
->src
[i
].reg
= dst
.reg
;
2284 inst
->src
[i
].reg_offset
= 0;
2285 inst
->src
[i
].width
= dispatch_width
;
2288 invalidate_live_intervals();
2292 fs_visitor::opt_algebraic()
2294 bool progress
= false;
2296 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2297 switch (inst
->opcode
) {
2298 case BRW_OPCODE_MOV
:
2299 if (inst
->src
[0].file
!= IMM
)
2302 if (inst
->saturate
) {
2303 if (inst
->dst
.type
!= inst
->src
[0].type
)
2304 assert(!"unimplemented: saturate mixed types");
2306 if (brw_saturate_immediate(inst
->dst
.type
,
2307 &inst
->src
[0].fixed_hw_reg
)) {
2308 inst
->saturate
= false;
2314 case BRW_OPCODE_MUL
:
2315 if (inst
->src
[1].file
!= IMM
)
2319 if (inst
->src
[1].is_one()) {
2320 inst
->opcode
= BRW_OPCODE_MOV
;
2321 inst
->src
[1] = reg_undef
;
2327 if (inst
->src
[1].is_zero()) {
2328 inst
->opcode
= BRW_OPCODE_MOV
;
2329 inst
->src
[0] = inst
->src
[1];
2330 inst
->src
[1] = reg_undef
;
2336 case BRW_OPCODE_ADD
:
2337 if (inst
->src
[1].file
!= IMM
)
2341 if (inst
->src
[1].is_zero()) {
2342 inst
->opcode
= BRW_OPCODE_MOV
;
2343 inst
->src
[1] = reg_undef
;
2349 if (inst
->src
[0].equals(inst
->src
[1])) {
2350 inst
->opcode
= BRW_OPCODE_MOV
;
2351 inst
->src
[1] = reg_undef
;
2356 case BRW_OPCODE_LRP
:
2357 if (inst
->src
[1].equals(inst
->src
[2])) {
2358 inst
->opcode
= BRW_OPCODE_MOV
;
2359 inst
->src
[0] = inst
->src
[1];
2360 inst
->src
[1] = reg_undef
;
2361 inst
->src
[2] = reg_undef
;
2366 case BRW_OPCODE_CMP
:
2367 if (inst
->conditional_mod
== BRW_CONDITIONAL_GE
&&
2369 inst
->src
[0].negate
&&
2370 inst
->src
[1].is_zero()) {
2371 inst
->src
[0].abs
= false;
2372 inst
->src
[0].negate
= false;
2373 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2378 case BRW_OPCODE_SEL
:
2379 if (inst
->src
[0].equals(inst
->src
[1])) {
2380 inst
->opcode
= BRW_OPCODE_MOV
;
2381 inst
->src
[1] = reg_undef
;
2382 inst
->predicate
= BRW_PREDICATE_NONE
;
2383 inst
->predicate_inverse
= false;
2385 } else if (inst
->saturate
&& inst
->src
[1].file
== IMM
) {
2386 switch (inst
->conditional_mod
) {
2387 case BRW_CONDITIONAL_LE
:
2388 case BRW_CONDITIONAL_L
:
2389 switch (inst
->src
[1].type
) {
2390 case BRW_REGISTER_TYPE_F
:
2391 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
>= 1.0f
) {
2392 inst
->opcode
= BRW_OPCODE_MOV
;
2393 inst
->src
[1] = reg_undef
;
2401 case BRW_CONDITIONAL_GE
:
2402 case BRW_CONDITIONAL_G
:
2403 switch (inst
->src
[1].type
) {
2404 case BRW_REGISTER_TYPE_F
:
2405 if (inst
->src
[1].fixed_hw_reg
.dw1
.f
<= 0.0f
) {
2406 inst
->opcode
= BRW_OPCODE_MOV
;
2407 inst
->src
[1] = reg_undef
;
2408 inst
->conditional_mod
= BRW_CONDITIONAL_NONE
;
2420 case SHADER_OPCODE_RCP
: {
2421 fs_inst
*prev
= (fs_inst
*)inst
->prev
;
2422 if (prev
->opcode
== SHADER_OPCODE_SQRT
) {
2423 if (inst
->src
[0].equals(prev
->dst
)) {
2424 inst
->opcode
= SHADER_OPCODE_RSQ
;
2425 inst
->src
[0] = prev
->src
[0];
2440 fs_visitor::opt_register_renaming()
2442 bool progress
= false;
2445 int remap
[virtual_grf_count
];
2446 memset(remap
, -1, sizeof(int) * virtual_grf_count
);
2448 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2449 if (inst
->opcode
== BRW_OPCODE_IF
|| inst
->opcode
== BRW_OPCODE_DO
) {
2451 } else if (inst
->opcode
== BRW_OPCODE_ENDIF
||
2452 inst
->opcode
== BRW_OPCODE_WHILE
) {
2456 /* Rewrite instruction sources. */
2457 for (int i
= 0; i
< inst
->sources
; i
++) {
2458 if (inst
->src
[i
].file
== GRF
&&
2459 remap
[inst
->src
[i
].reg
] != -1 &&
2460 remap
[inst
->src
[i
].reg
] != inst
->src
[i
].reg
) {
2461 inst
->src
[i
].reg
= remap
[inst
->src
[i
].reg
];
2466 const int dst
= inst
->dst
.reg
;
2469 inst
->dst
.file
== GRF
&&
2470 virtual_grf_sizes
[inst
->dst
.reg
] == inst
->dst
.width
/ 8 &&
2471 !inst
->is_partial_write()) {
2472 if (remap
[dst
] == -1) {
2475 remap
[dst
] = virtual_grf_alloc(inst
->dst
.width
/ 8);
2476 inst
->dst
.reg
= remap
[dst
];
2479 } else if (inst
->dst
.file
== GRF
&&
2481 remap
[dst
] != dst
) {
2482 inst
->dst
.reg
= remap
[dst
];
2488 invalidate_live_intervals();
2490 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_x
); i
++) {
2491 if (delta_x
[i
].file
== GRF
&& remap
[delta_x
[i
].reg
] != -1) {
2492 delta_x
[i
].reg
= remap
[delta_x
[i
].reg
];
2495 for (unsigned i
= 0; i
< ARRAY_SIZE(delta_y
); i
++) {
2496 if (delta_y
[i
].file
== GRF
&& remap
[delta_y
[i
].reg
] != -1) {
2497 delta_y
[i
].reg
= remap
[delta_y
[i
].reg
];
2506 fs_visitor::compute_to_mrf()
2508 bool progress
= false;
2511 /* No MRFs on Gen >= 7. */
2515 calculate_live_intervals();
2517 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
2521 if (inst
->opcode
!= BRW_OPCODE_MOV
||
2522 inst
->is_partial_write() ||
2523 inst
->dst
.file
!= MRF
|| inst
->src
[0].file
!= GRF
||
2524 inst
->dst
.type
!= inst
->src
[0].type
||
2525 inst
->src
[0].abs
|| inst
->src
[0].negate
||
2526 !inst
->src
[0].is_contiguous() ||
2527 inst
->src
[0].subreg_offset
)
2530 /* Work out which hardware MRF registers are written by this
2533 int mrf_low
= inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2535 if (inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2536 mrf_high
= mrf_low
+ 4;
2537 } else if (inst
->exec_size
== 16) {
2538 mrf_high
= mrf_low
+ 1;
2543 /* Can't compute-to-MRF this GRF if someone else was going to
2546 if (this->virtual_grf_end
[inst
->src
[0].reg
] > ip
)
2549 /* Found a move of a GRF to a MRF. Let's see if we can go
2550 * rewrite the thing that made this GRF to write into the MRF.
2552 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2553 if (scan_inst
->dst
.file
== GRF
&&
2554 scan_inst
->dst
.reg
== inst
->src
[0].reg
) {
2555 /* Found the last thing to write our reg we want to turn
2556 * into a compute-to-MRF.
2559 /* If this one instruction didn't populate all the
2560 * channels, bail. We might be able to rewrite everything
2561 * that writes that reg, but it would require smarter
2562 * tracking to delay the rewriting until complete success.
2564 if (scan_inst
->is_partial_write())
2567 /* Things returning more than one register would need us to
2568 * understand coalescing out more than one MOV at a time.
2570 if (scan_inst
->regs_written
> scan_inst
->dst
.width
/ 8)
2573 /* SEND instructions can't have MRF as a destination. */
2574 if (scan_inst
->mlen
)
2577 if (brw
->gen
== 6) {
2578 /* gen6 math instructions must have the destination be
2579 * GRF, so no compute-to-MRF for them.
2581 if (scan_inst
->is_math()) {
2586 if (scan_inst
->dst
.reg_offset
== inst
->src
[0].reg_offset
) {
2587 /* Found the creator of our MRF's source value. */
2588 scan_inst
->dst
.file
= MRF
;
2589 scan_inst
->dst
.reg
= inst
->dst
.reg
;
2590 scan_inst
->saturate
|= inst
->saturate
;
2591 inst
->remove(block
);
2597 /* We don't handle control flow here. Most computation of
2598 * values that end up in MRFs are shortly before the MRF
2601 if (block
->start() == scan_inst
)
2604 /* You can't read from an MRF, so if someone else reads our
2605 * MRF's source GRF that we wanted to rewrite, that stops us.
2607 bool interfered
= false;
2608 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
2609 if (scan_inst
->src
[i
].file
== GRF
&&
2610 scan_inst
->src
[i
].reg
== inst
->src
[0].reg
&&
2611 scan_inst
->src
[i
].reg_offset
== inst
->src
[0].reg_offset
) {
2618 if (scan_inst
->dst
.file
== MRF
) {
2619 /* If somebody else writes our MRF here, we can't
2620 * compute-to-MRF before that.
2622 int scan_mrf_low
= scan_inst
->dst
.reg
& ~BRW_MRF_COMPR4
;
2625 if (scan_inst
->dst
.reg
& BRW_MRF_COMPR4
) {
2626 scan_mrf_high
= scan_mrf_low
+ 4;
2627 } else if (scan_inst
->exec_size
== 16) {
2628 scan_mrf_high
= scan_mrf_low
+ 1;
2630 scan_mrf_high
= scan_mrf_low
;
2633 if (mrf_low
== scan_mrf_low
||
2634 mrf_low
== scan_mrf_high
||
2635 mrf_high
== scan_mrf_low
||
2636 mrf_high
== scan_mrf_high
) {
2641 if (scan_inst
->mlen
> 0 && scan_inst
->base_mrf
!= -1) {
2642 /* Found a SEND instruction, which means that there are
2643 * live values in MRFs from base_mrf to base_mrf +
2644 * scan_inst->mlen - 1. Don't go pushing our MRF write up
2647 if (mrf_low
>= scan_inst
->base_mrf
&&
2648 mrf_low
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2651 if (mrf_high
>= scan_inst
->base_mrf
&&
2652 mrf_high
< scan_inst
->base_mrf
+ scan_inst
->mlen
) {
2660 invalidate_live_intervals();
2666 * Once we've generated code, try to convert normal FS_OPCODE_FB_WRITE
2667 * instructions to FS_OPCODE_REP_FB_WRITE.
2670 fs_visitor::emit_repclear_shader()
2672 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
2674 int color_mrf
= base_mrf
+ 2;
2676 fs_inst
*mov
= emit(MOV(vec4(brw_message_reg(color_mrf
)),
2677 fs_reg(UNIFORM
, 0, BRW_REGISTER_TYPE_F
)));
2678 mov
->force_writemask_all
= true;
2681 if (key
->nr_color_regions
== 1) {
2682 write
= emit(FS_OPCODE_REP_FB_WRITE
);
2683 write
->saturate
= key
->clamp_fragment_color
;
2684 write
->base_mrf
= color_mrf
;
2686 write
->header_present
= false;
2689 assume(key
->nr_color_regions
> 0);
2690 for (int i
= 0; i
< key
->nr_color_regions
; ++i
) {
2691 write
= emit(FS_OPCODE_REP_FB_WRITE
);
2692 write
->saturate
= key
->clamp_fragment_color
;
2693 write
->base_mrf
= base_mrf
;
2695 write
->header_present
= true;
2703 assign_constant_locations();
2704 assign_curb_setup();
2706 /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
2707 assert(mov
->src
[0].file
== HW_REG
);
2708 mov
->src
[0] = brw_vec4_grf(mov
->src
[0].fixed_hw_reg
.nr
, 0);
2712 * Walks through basic blocks, looking for repeated MRF writes and
2713 * removing the later ones.
2716 fs_visitor::remove_duplicate_mrf_writes()
2718 fs_inst
*last_mrf_move
[16];
2719 bool progress
= false;
2721 /* Need to update the MRF tracking for compressed instructions. */
2722 if (dispatch_width
== 16)
2725 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2727 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
2728 if (inst
->is_control_flow()) {
2729 memset(last_mrf_move
, 0, sizeof(last_mrf_move
));
2732 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2733 inst
->dst
.file
== MRF
) {
2734 fs_inst
*prev_inst
= last_mrf_move
[inst
->dst
.reg
];
2735 if (prev_inst
&& inst
->equals(prev_inst
)) {
2736 inst
->remove(block
);
2742 /* Clear out the last-write records for MRFs that were overwritten. */
2743 if (inst
->dst
.file
== MRF
) {
2744 last_mrf_move
[inst
->dst
.reg
] = NULL
;
2747 if (inst
->mlen
> 0 && inst
->base_mrf
!= -1) {
2748 /* Found a SEND instruction, which will include two or fewer
2749 * implied MRF writes. We could do better here.
2751 for (int i
= 0; i
< implied_mrf_writes(inst
); i
++) {
2752 last_mrf_move
[inst
->base_mrf
+ i
] = NULL
;
2756 /* Clear out any MRF move records whose sources got overwritten. */
2757 if (inst
->dst
.file
== GRF
) {
2758 for (unsigned int i
= 0; i
< Elements(last_mrf_move
); i
++) {
2759 if (last_mrf_move
[i
] &&
2760 last_mrf_move
[i
]->src
[0].reg
== inst
->dst
.reg
) {
2761 last_mrf_move
[i
] = NULL
;
2766 if (inst
->opcode
== BRW_OPCODE_MOV
&&
2767 inst
->dst
.file
== MRF
&&
2768 inst
->src
[0].file
== GRF
&&
2769 !inst
->is_partial_write()) {
2770 last_mrf_move
[inst
->dst
.reg
] = inst
;
2775 invalidate_live_intervals();
2781 clear_deps_for_inst_src(fs_inst
*inst
, int dispatch_width
, bool *deps
,
2782 int first_grf
, int grf_len
)
2784 /* Clear the flag for registers that actually got read (as expected). */
2785 for (int i
= 0; i
< inst
->sources
; i
++) {
2787 if (inst
->src
[i
].file
== GRF
) {
2788 grf
= inst
->src
[i
].reg
;
2789 } else if (inst
->src
[i
].file
== HW_REG
&&
2790 inst
->src
[i
].fixed_hw_reg
.file
== BRW_GENERAL_REGISTER_FILE
) {
2791 grf
= inst
->src
[i
].fixed_hw_reg
.nr
;
2796 if (grf
>= first_grf
&&
2797 grf
< first_grf
+ grf_len
) {
2798 deps
[grf
- first_grf
] = false;
2799 if (inst
->exec_size
== 16)
2800 deps
[grf
- first_grf
+ 1] = false;
2806 * Implements this workaround for the original 965:
2808 * "[DevBW, DevCL] Implementation Restrictions: As the hardware does not
2809 * check for post destination dependencies on this instruction, software
2810 * must ensure that there is no destination hazard for the case of ‘write
2811 * followed by a posted write’ shown in the following example.
2814 * 2. send r3.xy <rest of send instruction>
2817 * Due to no post-destination dependency check on the ‘send’, the above
2818 * code sequence could have two instructions (1 and 2) in flight at the
2819 * same time that both consider ‘r3’ as the target of their final writes.
2822 fs_visitor::insert_gen4_pre_send_dependency_workarounds(bblock_t
*block
,
2825 int write_len
= inst
->regs_written
;
2826 int first_write_grf
= inst
->dst
.reg
;
2827 bool needs_dep
[BRW_MAX_MRF
];
2828 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2830 memset(needs_dep
, false, sizeof(needs_dep
));
2831 memset(needs_dep
, true, write_len
);
2833 clear_deps_for_inst_src(inst
, dispatch_width
,
2834 needs_dep
, first_write_grf
, write_len
);
2836 /* Walk backwards looking for writes to registers we're writing which
2837 * aren't read since being written. If we hit the start of the program,
2838 * we assume that there are no outstanding dependencies on entry to the
2841 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2842 /* If we hit control flow, assume that there *are* outstanding
2843 * dependencies, and force their cleanup before our instruction.
2845 if (block
->start() == scan_inst
) {
2846 for (int i
= 0; i
< write_len
; i
++) {
2848 inst
->insert_before(block
, DEP_RESOLVE_MOV(first_write_grf
+ i
));
2854 /* We insert our reads as late as possible on the assumption that any
2855 * instruction but a MOV that might have left us an outstanding
2856 * dependency has more latency than a MOV.
2858 if (scan_inst
->dst
.file
== GRF
) {
2859 for (int i
= 0; i
< scan_inst
->regs_written
; i
++) {
2860 int reg
= scan_inst
->dst
.reg
+ i
;
2862 if (reg
>= first_write_grf
&&
2863 reg
< first_write_grf
+ write_len
&&
2864 needs_dep
[reg
- first_write_grf
]) {
2865 inst
->insert_before(block
, DEP_RESOLVE_MOV(reg
));
2866 needs_dep
[reg
- first_write_grf
] = false;
2867 if (scan_inst
->exec_size
== 16)
2868 needs_dep
[reg
- first_write_grf
+ 1] = false;
2873 /* Clear the flag for registers that actually got read (as expected). */
2874 clear_deps_for_inst_src(scan_inst
, dispatch_width
,
2875 needs_dep
, first_write_grf
, write_len
);
2877 /* Continue the loop only if we haven't resolved all the dependencies */
2879 for (i
= 0; i
< write_len
; i
++) {
2889 * Implements this workaround for the original 965:
2891 * "[DevBW, DevCL] Errata: A destination register from a send can not be
2892 * used as a destination register until after it has been sourced by an
2893 * instruction with a different destination register.
2896 fs_visitor::insert_gen4_post_send_dependency_workarounds(bblock_t
*block
, fs_inst
*inst
)
2898 int write_len
= inst
->regs_written
;
2899 int first_write_grf
= inst
->dst
.reg
;
2900 bool needs_dep
[BRW_MAX_MRF
];
2901 assert(write_len
< (int)sizeof(needs_dep
) - 1);
2903 memset(needs_dep
, false, sizeof(needs_dep
));
2904 memset(needs_dep
, true, write_len
);
2905 /* Walk forwards looking for writes to registers we're writing which aren't
2906 * read before being written.
2908 foreach_inst_in_block_starting_from(fs_inst
, scan_inst
, inst
, block
) {
2909 /* If we hit control flow, force resolve all remaining dependencies. */
2910 if (block
->end() == scan_inst
) {
2911 for (int i
= 0; i
< write_len
; i
++) {
2913 scan_inst
->insert_before(block
,
2914 DEP_RESOLVE_MOV(first_write_grf
+ i
));
2919 /* Clear the flag for registers that actually got read (as expected). */
2920 clear_deps_for_inst_src(scan_inst
, dispatch_width
,
2921 needs_dep
, first_write_grf
, write_len
);
2923 /* We insert our reads as late as possible since they're reading the
2924 * result of a SEND, which has massive latency.
2926 if (scan_inst
->dst
.file
== GRF
&&
2927 scan_inst
->dst
.reg
>= first_write_grf
&&
2928 scan_inst
->dst
.reg
< first_write_grf
+ write_len
&&
2929 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
]) {
2930 scan_inst
->insert_before(block
, DEP_RESOLVE_MOV(scan_inst
->dst
.reg
));
2931 needs_dep
[scan_inst
->dst
.reg
- first_write_grf
] = false;
2934 /* Continue the loop only if we haven't resolved all the dependencies */
2936 for (i
= 0; i
< write_len
; i
++) {
2944 /* If we hit the end of the program, resolve all remaining dependencies out
2947 fs_inst
*last_inst
= (fs_inst
*)this->instructions
.get_tail();
2948 assert(last_inst
->eot
);
2949 for (int i
= 0; i
< write_len
; i
++) {
2951 last_inst
->insert_before(block
, DEP_RESOLVE_MOV(first_write_grf
+ i
));
2956 fs_visitor::insert_gen4_send_dependency_workarounds()
2958 if (brw
->gen
!= 4 || brw
->is_g4x
)
2961 bool progress
= false;
2963 /* Note that we're done with register allocation, so GRF fs_regs always
2964 * have a .reg_offset of 0.
2967 foreach_block_and_inst(block
, fs_inst
, inst
, cfg
) {
2968 if (inst
->mlen
!= 0 && inst
->dst
.file
== GRF
) {
2969 insert_gen4_pre_send_dependency_workarounds(block
, inst
);
2970 insert_gen4_post_send_dependency_workarounds(block
, inst
);
2976 invalidate_live_intervals();
2980 * Turns the generic expression-style uniform pull constant load instruction
2981 * into a hardware-specific series of instructions for loading a pull
2984 * The expression style allows the CSE pass before this to optimize out
2985 * repeated loads from the same offset, and gives the pre-register-allocation
2986 * scheduling full flexibility, while the conversion to native instructions
2987 * allows the post-register-allocation scheduler the best information
2990 * Note that execution masking for setting up pull constant loads is special:
2991 * the channels that need to be written are unrelated to the current execution
2992 * mask, since a later instruction will use one of the result channels as a
2993 * source operand for all 8 or 16 of its channels.
2996 fs_visitor::lower_uniform_pull_constant_loads()
2998 foreach_block_and_inst (block
, fs_inst
, inst
, cfg
) {
2999 if (inst
->opcode
!= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
)
3002 if (brw
->gen
>= 7) {
3003 /* The offset arg before was a vec4-aligned byte offset. We need to
3004 * turn it into a dword offset.
3006 fs_reg const_offset_reg
= inst
->src
[1];
3007 assert(const_offset_reg
.file
== IMM
&&
3008 const_offset_reg
.type
== BRW_REGISTER_TYPE_UD
);
3009 const_offset_reg
.fixed_hw_reg
.dw1
.ud
/= 4;
3010 fs_reg payload
= vgrf(glsl_type::uint_type
);
3012 /* We have to use a message header on Skylake to get SIMD4x2 mode.
3013 * Reserve space for the register.
3015 if (brw
->gen
>= 9) {
3016 payload
.reg_offset
++;
3017 virtual_grf_sizes
[payload
.reg
] = 2;
3020 /* This is actually going to be a MOV, but since only the first dword
3021 * is accessed, we have a special opcode to do just that one. Note
3022 * that this needs to be an operation that will be considered a def
3023 * by live variable analysis, or register allocation will explode.
3025 fs_inst
*setup
= new(mem_ctx
) fs_inst(FS_OPCODE_SET_SIMD4X2_OFFSET
,
3026 8, payload
, const_offset_reg
);
3027 setup
->force_writemask_all
= true;
3029 setup
->ir
= inst
->ir
;
3030 setup
->annotation
= inst
->annotation
;
3031 inst
->insert_before(block
, setup
);
3033 /* Similarly, this will only populate the first 4 channels of the
3034 * result register (since we only use smear values from 0-3), but we
3035 * don't tell the optimizer.
3037 inst
->opcode
= FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7
;
3038 inst
->src
[1] = payload
;
3040 invalidate_live_intervals();
3042 /* Before register allocation, we didn't tell the scheduler about the
3043 * MRF we use. We know it's safe to use this MRF because nothing
3044 * else does except for register spill/unspill, which generates and
3045 * uses its MRF within a single IR instruction.
3047 inst
->base_mrf
= 14;
3054 fs_visitor::lower_load_payload()
3056 bool progress
= false;
3058 int vgrf_to_reg
[virtual_grf_count
];
3059 int reg_count
= 16; /* Leave room for MRF */
3060 for (int i
= 0; i
< virtual_grf_count
; ++i
) {
3061 vgrf_to_reg
[i
] = reg_count
;
3062 reg_count
+= virtual_grf_sizes
[i
];
3066 bool written
:1; /* Whether this register has ever been written */
3067 bool force_writemask_all
:1;
3068 bool force_sechalf
:1;
3069 } metadata
[reg_count
];
3070 memset(metadata
, 0, sizeof(metadata
));
3072 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3074 if (inst
->dst
.file
== GRF
) {
3075 dst_reg
= vgrf_to_reg
[inst
->dst
.reg
];
3078 dst_reg
= inst
->dst
.reg
;
3081 if (inst
->dst
.file
== MRF
|| inst
->dst
.file
== GRF
) {
3082 bool force_sechalf
= inst
->force_sechalf
;
3083 bool toggle_sechalf
= inst
->dst
.width
== 16 &&
3084 type_sz(inst
->dst
.type
) == 4;
3085 for (int i
= 0; i
< inst
->regs_written
; ++i
) {
3086 metadata
[dst_reg
+ i
].written
= true;
3087 metadata
[dst_reg
+ i
].force_sechalf
= force_sechalf
;
3088 metadata
[dst_reg
+ i
].force_writemask_all
= inst
->force_writemask_all
;
3089 force_sechalf
= (toggle_sechalf
!= force_sechalf
);
3093 if (inst
->opcode
== SHADER_OPCODE_LOAD_PAYLOAD
) {
3094 assert(inst
->dst
.file
== MRF
|| inst
->dst
.file
== GRF
);
3095 fs_reg dst
= inst
->dst
;
3097 for (int i
= 0; i
< inst
->sources
; i
++) {
3098 dst
.width
= inst
->src
[i
].effective_width
;
3099 dst
.type
= inst
->src
[i
].type
;
3101 if (inst
->src
[i
].file
== BAD_FILE
) {
3102 /* Do nothing but otherwise increment as normal */
3103 } else if (dst
.file
== MRF
&&
3106 i
+ 4 < inst
->sources
&&
3107 inst
->src
[i
+ 4].equals(horiz_offset(inst
->src
[i
], 8))) {
3108 fs_reg compr4_dst
= dst
;
3109 compr4_dst
.reg
+= BRW_MRF_COMPR4
;
3110 compr4_dst
.width
= 16;
3111 fs_reg compr4_src
= inst
->src
[i
];
3112 compr4_src
.width
= 16;
3113 fs_inst
*mov
= MOV(compr4_dst
, compr4_src
);
3114 mov
->force_writemask_all
= true;
3115 inst
->insert_before(block
, mov
);
3116 /* Mark i+4 as BAD_FILE so we don't emit a MOV for it */
3117 inst
->src
[i
+ 4].file
= BAD_FILE
;
3119 fs_inst
*mov
= MOV(dst
, inst
->src
[i
]);
3120 if (inst
->src
[i
].file
== GRF
) {
3121 int src_reg
= vgrf_to_reg
[inst
->src
[i
].reg
] +
3122 inst
->src
[i
].reg_offset
;
3123 mov
->force_sechalf
= metadata
[src_reg
].force_sechalf
;
3124 mov
->force_writemask_all
= metadata
[src_reg
].force_writemask_all
;
3125 metadata
[dst_reg
] = metadata
[src_reg
];
3126 if (dst
.width
* type_sz(dst
.type
) > 32) {
3127 assert((!metadata
[src_reg
].written
||
3128 !metadata
[src_reg
].force_sechalf
) &&
3129 (!metadata
[src_reg
+ 1].written
||
3130 metadata
[src_reg
+ 1].force_sechalf
));
3131 metadata
[dst_reg
+ 1] = metadata
[src_reg
+ 1];
3134 metadata
[dst_reg
].force_writemask_all
= false;
3135 metadata
[dst_reg
].force_sechalf
= false;
3136 if (dst
.width
== 16) {
3137 metadata
[dst_reg
+ 1].force_writemask_all
= false;
3138 metadata
[dst_reg
+ 1].force_sechalf
= true;
3141 inst
->insert_before(block
, mov
);
3144 dst
= offset(dst
, 1);
3147 inst
->remove(block
);
3153 invalidate_live_intervals();
3159 fs_visitor::dump_instructions()
3161 dump_instructions(NULL
);
3165 fs_visitor::dump_instructions(const char *name
)
3167 calculate_register_pressure();
3168 FILE *file
= stderr
;
3169 if (name
&& geteuid() != 0) {
3170 file
= fopen(name
, "w");
3175 int ip
= 0, max_pressure
= 0;
3176 foreach_block_and_inst(block
, backend_instruction
, inst
, cfg
) {
3177 max_pressure
= MAX2(max_pressure
, regs_live_at_ip
[ip
]);
3178 fprintf(file
, "{%3d} %4d: ", regs_live_at_ip
[ip
], ip
);
3179 dump_instruction(inst
, file
);
3182 fprintf(file
, "Maximum %3d registers live at once.\n", max_pressure
);
3184 if (file
!= stderr
) {
3190 fs_visitor::dump_instruction(backend_instruction
*be_inst
)
3192 dump_instruction(be_inst
, stderr
);
3196 fs_visitor::dump_instruction(backend_instruction
*be_inst
, FILE *file
)
3198 fs_inst
*inst
= (fs_inst
*)be_inst
;
3200 if (inst
->predicate
) {
3201 fprintf(file
, "(%cf0.%d) ",
3202 inst
->predicate_inverse
? '-' : '+',
3206 fprintf(file
, "%s", brw_instruction_name(inst
->opcode
));
3208 fprintf(file
, ".sat");
3209 if (inst
->conditional_mod
) {
3210 fprintf(file
, "%s", conditional_modifier
[inst
->conditional_mod
]);
3211 if (!inst
->predicate
&&
3212 (brw
->gen
< 5 || (inst
->opcode
!= BRW_OPCODE_SEL
&&
3213 inst
->opcode
!= BRW_OPCODE_IF
&&
3214 inst
->opcode
!= BRW_OPCODE_WHILE
))) {
3215 fprintf(file
, ".f0.%d", inst
->flag_subreg
);
3218 fprintf(file
, "(%d) ", inst
->exec_size
);
3221 switch (inst
->dst
.file
) {
3223 fprintf(file
, "vgrf%d", inst
->dst
.reg
);
3224 if (inst
->dst
.width
!= dispatch_width
)
3225 fprintf(file
, "@%d", inst
->dst
.width
);
3226 if (virtual_grf_sizes
[inst
->dst
.reg
] != inst
->dst
.width
/ 8 ||
3227 inst
->dst
.subreg_offset
)
3228 fprintf(file
, "+%d.%d",
3229 inst
->dst
.reg_offset
, inst
->dst
.subreg_offset
);
3232 fprintf(file
, "m%d", inst
->dst
.reg
);
3235 fprintf(file
, "(null)");
3238 fprintf(file
, "***u%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
3241 fprintf(file
, "***attr%d***", inst
->dst
.reg
+ inst
->dst
.reg_offset
);
3244 if (inst
->dst
.fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
3245 switch (inst
->dst
.fixed_hw_reg
.nr
) {
3247 fprintf(file
, "null");
3249 case BRW_ARF_ADDRESS
:
3250 fprintf(file
, "a0.%d", inst
->dst
.fixed_hw_reg
.subnr
);
3252 case BRW_ARF_ACCUMULATOR
:
3253 fprintf(file
, "acc%d", inst
->dst
.fixed_hw_reg
.subnr
);
3256 fprintf(file
, "f%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
3257 inst
->dst
.fixed_hw_reg
.subnr
);
3260 fprintf(file
, "arf%d.%d", inst
->dst
.fixed_hw_reg
.nr
& 0xf,
3261 inst
->dst
.fixed_hw_reg
.subnr
);
3265 fprintf(file
, "hw_reg%d", inst
->dst
.fixed_hw_reg
.nr
);
3267 if (inst
->dst
.fixed_hw_reg
.subnr
)
3268 fprintf(file
, "+%d", inst
->dst
.fixed_hw_reg
.subnr
);
3271 fprintf(file
, "???");
3274 fprintf(file
, ":%s, ", brw_reg_type_letters(inst
->dst
.type
));
3276 for (int i
= 0; i
< inst
->sources
; i
++) {
3277 if (inst
->src
[i
].negate
)
3279 if (inst
->src
[i
].abs
)
3281 switch (inst
->src
[i
].file
) {
3283 fprintf(file
, "vgrf%d", inst
->src
[i
].reg
);
3284 if (inst
->src
[i
].width
!= dispatch_width
)
3285 fprintf(file
, "@%d", inst
->src
[i
].width
);
3286 if (virtual_grf_sizes
[inst
->src
[i
].reg
] != inst
->src
[i
].width
/ 8 ||
3287 inst
->src
[i
].subreg_offset
)
3288 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
3289 inst
->src
[i
].subreg_offset
);
3292 fprintf(file
, "***m%d***", inst
->src
[i
].reg
);
3295 fprintf(file
, "attr%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
3298 fprintf(file
, "u%d", inst
->src
[i
].reg
+ inst
->src
[i
].reg_offset
);
3299 if (inst
->src
[i
].reladdr
) {
3300 fprintf(file
, "+reladdr");
3301 } else if (inst
->src
[i
].subreg_offset
) {
3302 fprintf(file
, "+%d.%d", inst
->src
[i
].reg_offset
,
3303 inst
->src
[i
].subreg_offset
);
3307 fprintf(file
, "(null)");
3310 switch (inst
->src
[i
].type
) {
3311 case BRW_REGISTER_TYPE_F
:
3312 fprintf(file
, "%ff", inst
->src
[i
].fixed_hw_reg
.dw1
.f
);
3314 case BRW_REGISTER_TYPE_D
:
3315 fprintf(file
, "%dd", inst
->src
[i
].fixed_hw_reg
.dw1
.d
);
3317 case BRW_REGISTER_TYPE_UD
:
3318 fprintf(file
, "%uu", inst
->src
[i
].fixed_hw_reg
.dw1
.ud
);
3320 case BRW_REGISTER_TYPE_VF
:
3321 fprintf(file
, "[%-gF, %-gF, %-gF, %-gF]",
3322 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 0) & 0xff),
3323 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 8) & 0xff),
3324 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 16) & 0xff),
3325 brw_vf_to_float((inst
->src
[i
].fixed_hw_reg
.dw1
.ud
>> 24) & 0xff));
3328 fprintf(file
, "???");
3333 if (inst
->src
[i
].fixed_hw_reg
.negate
)
3335 if (inst
->src
[i
].fixed_hw_reg
.abs
)
3337 if (inst
->src
[i
].fixed_hw_reg
.file
== BRW_ARCHITECTURE_REGISTER_FILE
) {
3338 switch (inst
->src
[i
].fixed_hw_reg
.nr
) {
3340 fprintf(file
, "null");
3342 case BRW_ARF_ADDRESS
:
3343 fprintf(file
, "a0.%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3345 case BRW_ARF_ACCUMULATOR
:
3346 fprintf(file
, "acc%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3349 fprintf(file
, "f%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
3350 inst
->src
[i
].fixed_hw_reg
.subnr
);
3353 fprintf(file
, "arf%d.%d", inst
->src
[i
].fixed_hw_reg
.nr
& 0xf,
3354 inst
->src
[i
].fixed_hw_reg
.subnr
);
3358 fprintf(file
, "hw_reg%d", inst
->src
[i
].fixed_hw_reg
.nr
);
3360 if (inst
->src
[i
].fixed_hw_reg
.subnr
)
3361 fprintf(file
, "+%d", inst
->src
[i
].fixed_hw_reg
.subnr
);
3362 if (inst
->src
[i
].fixed_hw_reg
.abs
)
3366 fprintf(file
, "???");
3369 if (inst
->src
[i
].abs
)
3372 if (inst
->src
[i
].file
!= IMM
) {
3373 fprintf(file
, ":%s", brw_reg_type_letters(inst
->src
[i
].type
));
3376 if (i
< inst
->sources
- 1 && inst
->src
[i
+ 1].file
!= BAD_FILE
)
3377 fprintf(file
, ", ");
3382 if (dispatch_width
== 16 && inst
->exec_size
== 8) {
3383 if (inst
->force_sechalf
)
3384 fprintf(file
, "2ndhalf ");
3386 fprintf(file
, "1sthalf ");
3389 fprintf(file
, "\n");
3393 * Possibly returns an instruction that set up @param reg.
3395 * Sometimes we want to take the result of some expression/variable
3396 * dereference tree and rewrite the instruction generating the result
3397 * of the tree. When processing the tree, we know that the
3398 * instructions generated are all writing temporaries that are dead
3399 * outside of this tree. So, if we have some instructions that write
3400 * a temporary, we're free to point that temp write somewhere else.
3402 * Note that this doesn't guarantee that the instruction generated
3403 * only reg -- it might be the size=4 destination of a texture instruction.
3406 fs_visitor::get_instruction_generating_reg(fs_inst
*start
,
3411 end
->is_partial_write() ||
3413 !reg
.equals(end
->dst
)) {
3421 fs_visitor::setup_payload_gen6()
3424 (prog
->InputsRead
& (1 << VARYING_SLOT_POS
)) != 0;
3425 unsigned barycentric_interp_modes
=
3426 (stage
== MESA_SHADER_FRAGMENT
) ?
3427 ((brw_wm_prog_data
*) this->prog_data
)->barycentric_interp_modes
: 0;
3429 assert(brw
->gen
>= 6);
3431 /* R0-1: masks, pixel X/Y coordinates. */
3432 payload
.num_regs
= 2;
3433 /* R2: only for 32-pixel dispatch.*/
3435 /* R3-26: barycentric interpolation coordinates. These appear in the
3436 * same order that they appear in the brw_wm_barycentric_interp_mode
3437 * enum. Each set of coordinates occupies 2 registers if dispatch width
3438 * == 8 and 4 registers if dispatch width == 16. Coordinates only
3439 * appear if they were enabled using the "Barycentric Interpolation
3440 * Mode" bits in WM_STATE.
3442 for (int i
= 0; i
< BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT
; ++i
) {
3443 if (barycentric_interp_modes
& (1 << i
)) {
3444 payload
.barycentric_coord_reg
[i
] = payload
.num_regs
;
3445 payload
.num_regs
+= 2;
3446 if (dispatch_width
== 16) {
3447 payload
.num_regs
+= 2;
3452 /* R27: interpolated depth if uses source depth */
3454 payload
.source_depth_reg
= payload
.num_regs
;
3456 if (dispatch_width
== 16) {
3457 /* R28: interpolated depth if not SIMD8. */
3461 /* R29: interpolated W set if GEN6_WM_USES_SOURCE_W. */
3463 payload
.source_w_reg
= payload
.num_regs
;
3465 if (dispatch_width
== 16) {
3466 /* R30: interpolated W if not SIMD8. */
3471 if (stage
== MESA_SHADER_FRAGMENT
) {
3472 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3473 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
3474 prog_data
->uses_pos_offset
= key
->compute_pos_offset
;
3475 /* R31: MSAA position offsets. */
3476 if (prog_data
->uses_pos_offset
) {
3477 payload
.sample_pos_reg
= payload
.num_regs
;
3482 /* R32: MSAA input coverage mask */
3483 if (prog
->SystemValuesRead
& SYSTEM_BIT_SAMPLE_MASK_IN
) {
3484 assert(brw
->gen
>= 7);
3485 payload
.sample_mask_in_reg
= payload
.num_regs
;
3487 if (dispatch_width
== 16) {
3488 /* R33: input coverage mask if not SIMD8. */
3493 /* R34-: bary for 32-pixel. */
3494 /* R58-59: interp W for 32-pixel. */
3496 if (prog
->OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
)) {
3497 source_depth_to_render_target
= true;
3502 fs_visitor::setup_vs_payload()
3504 /* R0: thread header, R1: urb handles */
3505 payload
.num_regs
= 2;
3509 fs_visitor::assign_binding_table_offsets()
3511 assert(stage
== MESA_SHADER_FRAGMENT
);
3512 brw_wm_prog_data
*prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3513 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
3514 uint32_t next_binding_table_offset
= 0;
3516 /* If there are no color regions, we still perform an FB write to a null
3517 * renderbuffer, which we place at surface index 0.
3519 prog_data
->binding_table
.render_target_start
= next_binding_table_offset
;
3520 next_binding_table_offset
+= MAX2(key
->nr_color_regions
, 1);
3522 assign_common_binding_table_offsets(next_binding_table_offset
);
3526 fs_visitor::calculate_register_pressure()
3528 invalidate_live_intervals();
3529 calculate_live_intervals();
3531 unsigned num_instructions
= 0;
3532 foreach_block(block
, cfg
)
3533 num_instructions
+= block
->instructions
.length();
3535 regs_live_at_ip
= rzalloc_array(mem_ctx
, int, num_instructions
);
3537 for (int reg
= 0; reg
< virtual_grf_count
; reg
++) {
3538 for (int ip
= virtual_grf_start
[reg
]; ip
<= virtual_grf_end
[reg
]; ip
++)
3539 regs_live_at_ip
[ip
] += virtual_grf_sizes
[reg
];
3544 fs_visitor::optimize()
3546 const char *stage_name
= stage
== MESA_SHADER_VERTEX
? "vs" : "fs";
3550 split_virtual_grfs();
3552 move_uniform_array_access_to_pull_constants();
3553 assign_constant_locations();
3554 demote_pull_constants();
3556 #define OPT(pass, args...) ({ \
3558 bool this_progress = pass(args); \
3560 if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
3561 char filename[64]; \
3562 snprintf(filename, 64, "%s%d-%04d-%02d-%02d-" #pass, \
3563 stage_name, dispatch_width, shader_prog ? shader_prog->Name : 0, iteration, pass_num); \
3565 backend_visitor::dump_instructions(filename); \
3568 progress = progress || this_progress; \
3572 if (unlikely(INTEL_DEBUG
& DEBUG_OPTIMIZER
)) {
3574 snprintf(filename
, 64, "%s%d-%04d-00-start",
3575 stage_name
, dispatch_width
, shader_prog
? shader_prog
->Name
: 0);
3577 backend_visitor::dump_instructions(filename
);
3588 OPT(remove_duplicate_mrf_writes
);
3592 OPT(opt_copy_propagate
);
3593 OPT(opt_peephole_predicated_break
);
3594 OPT(opt_cmod_propagation
);
3595 OPT(dead_code_eliminate
);
3596 OPT(opt_peephole_sel
);
3597 OPT(dead_control_flow_eliminate
, this);
3598 OPT(opt_register_renaming
);
3599 OPT(opt_saturate_propagation
);
3600 OPT(register_coalesce
);
3601 OPT(compute_to_mrf
);
3603 OPT(compact_virtual_grfs
);
3608 if (OPT(lower_load_payload
)) {
3609 split_virtual_grfs();
3610 OPT(register_coalesce
);
3611 OPT(compute_to_mrf
);
3612 OPT(dead_code_eliminate
);
3615 lower_uniform_pull_constant_loads();
3619 * Three source instruction must have a GRF/MRF destination register.
3620 * ARF NULL is not allowed. Fix that up by allocating a temporary GRF.
3623 fs_visitor::fixup_3src_null_dest()
3625 foreach_block_and_inst_safe (block
, fs_inst
, inst
, cfg
) {
3626 if (inst
->is_3src() && inst
->dst
.is_null()) {
3627 inst
->dst
= fs_reg(GRF
, virtual_grf_alloc(dispatch_width
/ 8),
3634 fs_visitor::allocate_registers()
3636 bool allocated_without_spills
;
3638 static const enum instruction_scheduler_mode pre_modes
[] = {
3640 SCHEDULE_PRE_NON_LIFO
,
3644 /* Try each scheduling heuristic to see if it can successfully register
3645 * allocate without spilling. They should be ordered by decreasing
3646 * performance but increasing likelihood of allocating.
3648 for (unsigned i
= 0; i
< ARRAY_SIZE(pre_modes
); i
++) {
3649 schedule_instructions(pre_modes
[i
]);
3652 assign_regs_trivial();
3653 allocated_without_spills
= true;
3655 allocated_without_spills
= assign_regs(false);
3657 if (allocated_without_spills
)
3661 if (!allocated_without_spills
) {
3662 const char *stage_name
= stage
== MESA_SHADER_VERTEX
?
3663 "Vertex" : "Fragment";
3665 /* We assume that any spilling is worse than just dropping back to
3666 * SIMD8. There's probably actually some intermediate point where
3667 * SIMD16 with a couple of spills is still better.
3669 if (dispatch_width
== 16) {
3670 fail("Failure to register allocate. Reduce number of "
3671 "live scalar values to avoid this.");
3673 perf_debug("%s shader triggered register spilling. "
3674 "Try reducing the number of live scalar values to "
3675 "improve performance.\n", stage_name
);
3678 /* Since we're out of heuristics, just go spill registers until we
3679 * get an allocation.
3681 while (!assign_regs(true)) {
3687 /* This must come after all optimization and register allocation, since
3688 * it inserts dead code that happens to have side effects, and it does
3689 * so based on the actual physical registers in use.
3691 insert_gen4_send_dependency_workarounds();
3696 if (!allocated_without_spills
)
3697 schedule_instructions(SCHEDULE_POST
);
3699 if (last_scratch
> 0)
3700 prog_data
->total_scratch
= brw_get_scratch_size(last_scratch
);
3704 fs_visitor::run_vs()
3706 assert(stage
== MESA_SHADER_VERTEX
);
3708 assign_common_binding_table_offsets(0);
3711 if (INTEL_DEBUG
& DEBUG_SHADER_TIME
)
3712 emit_shader_time_begin();
3714 foreach_in_list(ir_instruction
, ir
, shader
->base
.ir
) {
3716 this->result
= reg_undef
;
3727 assign_curb_setup();
3728 assign_vs_urb_setup();
3730 fixup_3src_null_dest();
3731 allocate_registers();
3737 fs_visitor::run_fs()
3739 brw_wm_prog_data
*wm_prog_data
= (brw_wm_prog_data
*) this->prog_data
;
3740 brw_wm_prog_key
*wm_key
= (brw_wm_prog_key
*) this->key
;
3742 assert(stage
== MESA_SHADER_FRAGMENT
);
3744 sanity_param_count
= prog
->Parameters
->NumParameters
;
3746 assign_binding_table_offsets();
3749 setup_payload_gen6();
3751 setup_payload_gen4();
3755 } else if (brw
->use_rep_send
&& dispatch_width
== 16) {
3756 emit_repclear_shader();
3758 if (INTEL_DEBUG
& DEBUG_SHADER_TIME
)
3759 emit_shader_time_begin();
3761 calculate_urb_setup();
3762 if (prog
->InputsRead
> 0) {
3764 emit_interpolation_setup_gen4();
3766 emit_interpolation_setup_gen6();
3769 /* We handle discards by keeping track of the still-live pixels in f0.1.
3770 * Initialize it with the dispatched pixels.
3772 if (wm_prog_data
->uses_kill
) {
3773 fs_inst
*discard_init
= emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
3774 discard_init
->flag_subreg
= 1;
3777 /* Generate FS IR for main(). (the visitor only descends into
3778 * functions called "main").
3781 if (getenv("INTEL_USE_NIR") != NULL
) {
3784 foreach_in_list(ir_instruction
, ir
, shader
->base
.ir
) {
3786 this->result
= reg_undef
;
3791 emit_fragment_program_code();
3797 emit(FS_OPCODE_PLACEHOLDER_HALT
);
3799 if (wm_key
->alpha_test_func
)
3806 assign_curb_setup();
3809 fixup_3src_null_dest();
3810 allocate_registers();
3816 if (dispatch_width
== 8)
3817 wm_prog_data
->reg_blocks
= brw_register_blocks(grf_used
);
3819 wm_prog_data
->reg_blocks_16
= brw_register_blocks(grf_used
);
3821 /* If any state parameters were appended, then ParameterValues could have
3822 * been realloced, in which case the driver uniform storage set up by
3823 * _mesa_associate_uniform_storage() would point to freed memory. Make
3824 * sure that didn't happen.
3826 assert(sanity_param_count
== prog
->Parameters
->NumParameters
);
3832 brw_wm_fs_emit(struct brw_context
*brw
,
3834 const struct brw_wm_prog_key
*key
,
3835 struct brw_wm_prog_data
*prog_data
,
3836 struct gl_fragment_program
*fp
,
3837 struct gl_shader_program
*prog
,
3838 unsigned *final_assembly_size
)
3840 bool start_busy
= false;
3841 double start_time
= 0;
3843 if (unlikely(brw
->perf_debug
)) {
3844 start_busy
= (brw
->batch
.last_bo
&&
3845 drm_intel_bo_busy(brw
->batch
.last_bo
));
3846 start_time
= get_time();
3849 struct brw_shader
*shader
= NULL
;
3851 shader
= (brw_shader
*) prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
3853 if (unlikely(INTEL_DEBUG
& DEBUG_WM
))
3854 brw_dump_ir("fragment", prog
, &shader
->base
, &fp
->Base
);
3856 /* Now the main event: Visit the shader IR and generate our FS IR for it.
3858 fs_visitor
v(brw
, mem_ctx
, key
, prog_data
, prog
, fp
, 8);
3861 prog
->LinkStatus
= false;
3862 ralloc_strcat(&prog
->InfoLog
, v
.fail_msg
);
3865 _mesa_problem(NULL
, "Failed to compile fragment shader: %s\n",
3871 cfg_t
*simd16_cfg
= NULL
;
3872 fs_visitor
v2(brw
, mem_ctx
, key
, prog_data
, prog
, fp
, 16);
3873 if (brw
->gen
>= 5 && likely(!(INTEL_DEBUG
& DEBUG_NO16
) ||
3874 brw
->use_rep_send
)) {
3875 if (!v
.simd16_unsupported
) {
3876 /* Try a SIMD16 compile */
3877 v2
.import_uniforms(&v
);
3879 perf_debug("SIMD16 shader failed to compile, falling back to "
3880 "SIMD8 at a 10-20%% performance cost: %s", v2
.fail_msg
);
3882 simd16_cfg
= v2
.cfg
;
3885 perf_debug("SIMD16 shader unsupported, falling back to "
3886 "SIMD8 at a 10-20%% performance cost: %s", v
.no16_msg
);
3891 int no_simd8
= (INTEL_DEBUG
& DEBUG_NO8
) || brw
->no_simd8
;
3892 if (no_simd8
&& simd16_cfg
) {
3894 prog_data
->no_8
= true;
3897 prog_data
->no_8
= false;
3900 fs_generator
g(brw
, mem_ctx
, (void *) key
, &prog_data
->base
,
3901 &fp
->Base
, v
.runtime_check_aads_emit
, "FS");
3903 if (unlikely(INTEL_DEBUG
& DEBUG_WM
)) {
3906 name
= ralloc_asprintf(mem_ctx
, "%s fragment shader %d",
3907 prog
->Label
? prog
->Label
: "unnamed",
3910 name
= ralloc_asprintf(mem_ctx
, "fragment program %d", fp
->Base
.Id
);
3912 g
.enable_debug(name
);
3916 g
.generate_code(simd8_cfg
, 8);
3918 prog_data
->prog_offset_16
= g
.generate_code(simd16_cfg
, 16);
3920 if (unlikely(brw
->perf_debug
) && shader
) {
3921 if (shader
->compiled_once
)
3922 brw_wm_debug_recompile(brw
, prog
, key
);
3923 shader
->compiled_once
= true;
3925 if (start_busy
&& !drm_intel_bo_busy(brw
->batch
.last_bo
)) {
3926 perf_debug("FS compile took %.03f ms and stalled the GPU\n",
3927 (get_time() - start_time
) * 1000);
3931 return g
.get_assembly(final_assembly_size
);
3935 brw_fs_precompile(struct gl_context
*ctx
,
3936 struct gl_shader_program
*shader_prog
,
3937 struct gl_program
*prog
)
3939 struct brw_context
*brw
= brw_context(ctx
);
3940 struct brw_wm_prog_key key
;
3942 struct gl_fragment_program
*fp
= (struct gl_fragment_program
*) prog
;
3943 struct brw_fragment_program
*bfp
= brw_fragment_program(fp
);
3944 bool program_uses_dfdy
= fp
->UsesDFdy
;
3946 memset(&key
, 0, sizeof(key
));
3950 key
.iz_lookup
|= IZ_PS_KILL_ALPHATEST_BIT
;
3952 if (fp
->Base
.OutputsWritten
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
))
3953 key
.iz_lookup
|= IZ_PS_COMPUTES_DEPTH_BIT
;
3955 /* Just assume depth testing. */
3956 key
.iz_lookup
|= IZ_DEPTH_TEST_ENABLE_BIT
;
3957 key
.iz_lookup
|= IZ_DEPTH_WRITE_ENABLE_BIT
;
3960 if (brw
->gen
< 6 || _mesa_bitcount_64(fp
->Base
.InputsRead
&
3961 BRW_FS_VARYING_INPUT_MASK
) > 16)
3962 key
.input_slots_valid
= fp
->Base
.InputsRead
| VARYING_BIT_POS
;
3964 const bool has_shader_channel_select
= brw
->is_haswell
|| brw
->gen
>= 8;
3965 unsigned sampler_count
= _mesa_fls(fp
->Base
.SamplersUsed
);
3966 for (unsigned i
= 0; i
< sampler_count
; i
++) {
3967 if (!has_shader_channel_select
&& (fp
->Base
.ShadowSamplers
& (1 << i
))) {
3968 /* Assume DEPTH_TEXTURE_MODE is the default: X, X, X, 1 */
3969 key
.tex
.swizzles
[i
] =
3970 MAKE_SWIZZLE4(SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_X
, SWIZZLE_ONE
);
3972 /* Color sampler: assume no swizzling. */
3973 key
.tex
.swizzles
[i
] = SWIZZLE_XYZW
;
3977 if (fp
->Base
.InputsRead
& VARYING_BIT_POS
) {
3978 key
.drawable_height
= ctx
->DrawBuffer
->Height
;
3981 key
.nr_color_regions
= _mesa_bitcount_64(fp
->Base
.OutputsWritten
&
3982 ~(BITFIELD64_BIT(FRAG_RESULT_DEPTH
) |
3983 BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK
)));
3985 if ((fp
->Base
.InputsRead
& VARYING_BIT_POS
) || program_uses_dfdy
) {
3986 key
.render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
) ||
3987 key
.nr_color_regions
> 1;
3990 key
.program_string_id
= bfp
->id
;
3992 uint32_t old_prog_offset
= brw
->wm
.base
.prog_offset
;
3993 struct brw_wm_prog_data
*old_prog_data
= brw
->wm
.prog_data
;
3995 bool success
= do_wm_prog(brw
, shader_prog
, bfp
, &key
);
3997 brw
->wm
.base
.prog_offset
= old_prog_offset
;
3998 brw
->wm
.prog_data
= old_prog_data
;