2 * Copyright © 2011 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
27 #include "util/u_math.h"
31 vec4_instruction::vec4_instruction(enum opcode opcode
, const dst_reg
&dst
,
32 const src_reg
&src0
, const src_reg
&src1
,
35 this->opcode
= opcode
;
40 this->saturate
= false;
41 this->force_writemask_all
= false;
42 this->no_dd_clear
= false;
43 this->no_dd_check
= false;
44 this->writes_accumulator
= false;
45 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
46 this->predicate
= BRW_PREDICATE_NONE
;
47 this->predicate_inverse
= false;
49 this->shadow_compare
= false;
52 this->urb_write_flags
= BRW_URB_WRITE_NO_FLAGS
;
53 this->header_size
= 0;
54 this->flag_subreg
= 0;
60 this->size_written
= (dst
.file
== BAD_FILE
?
61 0 : this->exec_size
* type_sz(dst
.type
));
62 this->annotation
= NULL
;
66 vec4_visitor::emit(vec4_instruction
*inst
)
68 inst
->ir
= this->base_ir
;
69 inst
->annotation
= this->current_annotation
;
71 this->instructions
.push_tail(inst
);
77 vec4_visitor::emit_before(bblock_t
*block
, vec4_instruction
*inst
,
78 vec4_instruction
*new_inst
)
80 new_inst
->ir
= inst
->ir
;
81 new_inst
->annotation
= inst
->annotation
;
83 inst
->insert_before(block
, new_inst
);
89 vec4_visitor::emit(enum opcode opcode
, const dst_reg
&dst
, const src_reg
&src0
,
90 const src_reg
&src1
, const src_reg
&src2
)
92 return emit(new(mem_ctx
) vec4_instruction(opcode
, dst
, src0
, src1
, src2
));
97 vec4_visitor::emit(enum opcode opcode
, const dst_reg
&dst
, const src_reg
&src0
,
100 return emit(new(mem_ctx
) vec4_instruction(opcode
, dst
, src0
, src1
));
104 vec4_visitor::emit(enum opcode opcode
, const dst_reg
&dst
, const src_reg
&src0
)
106 return emit(new(mem_ctx
) vec4_instruction(opcode
, dst
, src0
));
110 vec4_visitor::emit(enum opcode opcode
, const dst_reg
&dst
)
112 return emit(new(mem_ctx
) vec4_instruction(opcode
, dst
));
116 vec4_visitor::emit(enum opcode opcode
)
118 return emit(new(mem_ctx
) vec4_instruction(opcode
, dst_reg()));
123 vec4_visitor::op(const dst_reg &dst, const src_reg &src0) \
125 return new(mem_ctx) vec4_instruction(BRW_OPCODE_##op, dst, src0); \
130 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
131 const src_reg &src1) \
133 return new(mem_ctx) vec4_instruction(BRW_OPCODE_##op, dst, \
137 #define ALU2_ACC(op) \
139 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
140 const src_reg &src1) \
142 vec4_instruction *inst = new(mem_ctx) vec4_instruction( \
143 BRW_OPCODE_##op, dst, src0, src1); \
144 inst->writes_accumulator = true; \
150 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
151 const src_reg &src1, const src_reg &src2) \
153 assert(devinfo->gen >= 6); \
154 return new(mem_ctx) vec4_instruction(BRW_OPCODE_##op, dst, \
192 /** Gen4 predicated IF. */
194 vec4_visitor::IF(enum brw_predicate predicate
)
196 vec4_instruction
*inst
;
198 inst
= new(mem_ctx
) vec4_instruction(BRW_OPCODE_IF
);
199 inst
->predicate
= predicate
;
204 /** Gen6 IF with embedded comparison. */
206 vec4_visitor::IF(src_reg src0
, src_reg src1
,
207 enum brw_conditional_mod condition
)
209 assert(devinfo
->gen
== 6);
211 vec4_instruction
*inst
;
213 resolve_ud_negate(&src0
);
214 resolve_ud_negate(&src1
);
216 inst
= new(mem_ctx
) vec4_instruction(BRW_OPCODE_IF
, dst_null_d(),
218 inst
->conditional_mod
= condition
;
224 * CMP: Sets the low bit of the destination channels with the result
225 * of the comparison, while the upper bits are undefined, and updates
226 * the flag register with the packed 16 bits of the result.
229 vec4_visitor::CMP(dst_reg dst
, src_reg src0
, src_reg src1
,
230 enum brw_conditional_mod condition
)
232 vec4_instruction
*inst
;
234 /* Take the instruction:
236 * CMP null<d> src0<f> src1<f>
238 * Original gen4 does type conversion to the destination type before
239 * comparison, producing garbage results for floating point comparisons.
241 * The destination type doesn't matter on newer generations, so we set the
242 * type to match src0 so we can compact the instruction.
244 dst
.type
= src0
.type
;
246 resolve_ud_negate(&src0
);
247 resolve_ud_negate(&src1
);
249 inst
= new(mem_ctx
) vec4_instruction(BRW_OPCODE_CMP
, dst
, src0
, src1
);
250 inst
->conditional_mod
= condition
;
256 vec4_visitor::SCRATCH_READ(const dst_reg
&dst
, const src_reg
&index
)
258 vec4_instruction
*inst
;
260 inst
= new(mem_ctx
) vec4_instruction(SHADER_OPCODE_GEN4_SCRATCH_READ
,
262 inst
->base_mrf
= FIRST_SPILL_MRF(devinfo
->gen
) + 1;
269 vec4_visitor::SCRATCH_WRITE(const dst_reg
&dst
, const src_reg
&src
,
270 const src_reg
&index
)
272 vec4_instruction
*inst
;
274 inst
= new(mem_ctx
) vec4_instruction(SHADER_OPCODE_GEN4_SCRATCH_WRITE
,
276 inst
->base_mrf
= FIRST_SPILL_MRF(devinfo
->gen
);
283 vec4_visitor::fix_3src_operand(const src_reg
&src
)
285 /* Using vec4 uniforms in SIMD4x2 programs is difficult. You'd like to be
286 * able to use vertical stride of zero to replicate the vec4 uniform, like
288 * g3<0;4,1>:f - [0, 4][1, 5][2, 6][3, 7]
290 * But you can't, since vertical stride is always four in three-source
291 * instructions. Instead, insert a MOV instruction to do the replication so
292 * that the three-source instruction can consume it.
295 /* The MOV is only needed if the source is a uniform or immediate. */
296 if (src
.file
!= UNIFORM
&& src
.file
!= IMM
)
299 if (src
.file
== UNIFORM
&& brw_is_single_value_swizzle(src
.swizzle
))
302 dst_reg expanded
= dst_reg(this, glsl_type::vec4_type
);
303 expanded
.type
= src
.type
;
304 emit(VEC4_OPCODE_UNPACK_UNIFORM
, expanded
, src
);
305 return src_reg(expanded
);
309 vec4_visitor::resolve_source_modifiers(const src_reg
&src
)
311 if (!src
.abs
&& !src
.negate
)
314 dst_reg resolved
= dst_reg(this, glsl_type::ivec4_type
);
315 resolved
.type
= src
.type
;
316 emit(MOV(resolved
, src
));
318 return src_reg(resolved
);
322 vec4_visitor::fix_math_operand(const src_reg
&src
)
324 if (devinfo
->gen
< 6 || devinfo
->gen
>= 8 || src
.file
== BAD_FILE
)
327 /* The gen6 math instruction ignores the source modifiers --
328 * swizzle, abs, negate, and at least some parts of the register
329 * region description.
331 * Rather than trying to enumerate all these cases, *always* expand the
332 * operand to a temp GRF for gen6.
334 * For gen7, keep the operand as-is, except if immediate, which gen7 still
338 if (devinfo
->gen
== 7 && src
.file
!= IMM
)
341 dst_reg expanded
= dst_reg(this, glsl_type::vec4_type
);
342 expanded
.type
= src
.type
;
343 emit(MOV(expanded
, src
));
344 return src_reg(expanded
);
348 vec4_visitor::emit_math(enum opcode opcode
,
350 const src_reg
&src0
, const src_reg
&src1
)
352 vec4_instruction
*math
=
353 emit(opcode
, dst
, fix_math_operand(src0
), fix_math_operand(src1
));
355 if (devinfo
->gen
== 6 && dst
.writemask
!= WRITEMASK_XYZW
) {
356 /* MATH on Gen6 must be align1, so we can't do writemasks. */
357 math
->dst
= dst_reg(this, glsl_type::vec4_type
);
358 math
->dst
.type
= dst
.type
;
359 math
= emit(MOV(dst
, src_reg(math
->dst
)));
360 } else if (devinfo
->gen
< 6) {
362 math
->mlen
= src1
.file
== BAD_FILE
? 1 : 2;
369 vec4_visitor::emit_pack_half_2x16(dst_reg dst
, src_reg src0
)
371 if (devinfo
->gen
< 7) {
372 unreachable("ir_unop_pack_half_2x16 should be lowered");
375 assert(dst
.type
== BRW_REGISTER_TYPE_UD
);
376 assert(src0
.type
== BRW_REGISTER_TYPE_F
);
378 /* From the Ivybridge PRM, Vol4, Part3, Section 6.27 f32to16:
380 * Because this instruction does not have a 16-bit floating-point type,
381 * the destination data type must be Word (W).
383 * The destination must be DWord-aligned and specify a horizontal stride
384 * (HorzStride) of 2. The 16-bit result is stored in the lower word of
385 * each destination channel and the upper word is not modified.
387 * The above restriction implies that the f32to16 instruction must use
388 * align1 mode, because only in align1 mode is it possible to specify
389 * horizontal stride. We choose here to defy the hardware docs and emit
390 * align16 instructions.
392 * (I [chadv] did attempt to emit align1 instructions for VS f32to16
393 * instructions. I was partially successful in that the code passed all
394 * tests. However, the code was dubiously correct and fragile, and the
395 * tests were not harsh enough to probe that frailty. Not trusting the
396 * code, I chose instead to remain in align16 mode in defiance of the hw
399 * I've [chadv] experimentally confirmed that, on gen7 hardware and the
400 * simulator, emitting a f32to16 in align16 mode with UD as destination
401 * data type is safe. The behavior differs from that specified in the PRM
402 * in that the upper word of each destination channel is cleared to 0.
405 dst_reg
tmp_dst(this, glsl_type::uvec2_type
);
406 src_reg
tmp_src(tmp_dst
);
409 /* Verify the undocumented behavior on which the following instructions
410 * rely. If f32to16 fails to clear the upper word of the X and Y channels,
411 * then the result of the bit-or instruction below will be incorrect.
413 * You should inspect the disasm output in order to verify that the MOV is
414 * not optimized away.
416 emit(MOV(tmp_dst
, brw_imm_ud(0x12345678u
)));
419 /* Give tmp the form below, where "." means untouched.
422 * |.|.|0x0000hhhh|0x0000llll|.|.|0x0000hhhh|0x0000llll|
424 * That the upper word of each write-channel be 0 is required for the
425 * following bit-shift and bit-or instructions to work. Note that this
426 * relies on the undocumented hardware behavior mentioned above.
428 tmp_dst
.writemask
= WRITEMASK_XY
;
429 emit(F32TO16(tmp_dst
, src0
));
431 /* Give the write-channels of dst the form:
434 tmp_src
.swizzle
= BRW_SWIZZLE_YYYY
;
435 emit(SHL(dst
, tmp_src
, brw_imm_ud(16u)));
437 /* Finally, give the write-channels of dst the form of packHalf2x16's
441 tmp_src
.swizzle
= BRW_SWIZZLE_XXXX
;
442 emit(OR(dst
, src_reg(dst
), tmp_src
));
446 vec4_visitor::emit_unpack_half_2x16(dst_reg dst
, src_reg src0
)
448 if (devinfo
->gen
< 7) {
449 unreachable("ir_unop_unpack_half_2x16 should be lowered");
452 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
453 assert(src0
.type
== BRW_REGISTER_TYPE_UD
);
455 /* From the Ivybridge PRM, Vol4, Part3, Section 6.26 f16to32:
457 * Because this instruction does not have a 16-bit floating-point type,
458 * the source data type must be Word (W). The destination type must be
461 * To use W as the source data type, we must adjust horizontal strides,
462 * which is only possible in align1 mode. All my [chadv] attempts at
463 * emitting align1 instructions for unpackHalf2x16 failed to pass the
464 * Piglit tests, so I gave up.
466 * I've verified that, on gen7 hardware and the simulator, it is safe to
467 * emit f16to32 in align16 mode with UD as source data type.
470 dst_reg
tmp_dst(this, glsl_type::uvec2_type
);
471 src_reg
tmp_src(tmp_dst
);
473 tmp_dst
.writemask
= WRITEMASK_X
;
474 emit(AND(tmp_dst
, src0
, brw_imm_ud(0xffffu
)));
476 tmp_dst
.writemask
= WRITEMASK_Y
;
477 emit(SHR(tmp_dst
, src0
, brw_imm_ud(16u)));
479 dst
.writemask
= WRITEMASK_XY
;
480 emit(F16TO32(dst
, tmp_src
));
484 vec4_visitor::emit_unpack_unorm_4x8(const dst_reg
&dst
, src_reg src0
)
486 /* Instead of splitting the 32-bit integer, shifting, and ORing it back
487 * together, we can shift it by <0, 8, 16, 24>. The packed integer immediate
488 * is not suitable to generate the shift values, but we can use the packed
489 * vector float and a type-converting MOV.
491 dst_reg
shift(this, glsl_type::uvec4_type
);
492 emit(MOV(shift
, brw_imm_vf4(0x00, 0x60, 0x70, 0x78)));
494 dst_reg
shifted(this, glsl_type::uvec4_type
);
495 src0
.swizzle
= BRW_SWIZZLE_XXXX
;
496 emit(SHR(shifted
, src0
, src_reg(shift
)));
498 shifted
.type
= BRW_REGISTER_TYPE_UB
;
499 dst_reg
f(this, glsl_type::vec4_type
);
500 emit(VEC4_OPCODE_MOV_BYTES
, f
, src_reg(shifted
));
502 emit(MUL(dst
, src_reg(f
), brw_imm_f(1.0f
/ 255.0f
)));
506 vec4_visitor::emit_unpack_snorm_4x8(const dst_reg
&dst
, src_reg src0
)
508 /* Instead of splitting the 32-bit integer, shifting, and ORing it back
509 * together, we can shift it by <0, 8, 16, 24>. The packed integer immediate
510 * is not suitable to generate the shift values, but we can use the packed
511 * vector float and a type-converting MOV.
513 dst_reg
shift(this, glsl_type::uvec4_type
);
514 emit(MOV(shift
, brw_imm_vf4(0x00, 0x60, 0x70, 0x78)));
516 dst_reg
shifted(this, glsl_type::uvec4_type
);
517 src0
.swizzle
= BRW_SWIZZLE_XXXX
;
518 emit(SHR(shifted
, src0
, src_reg(shift
)));
520 shifted
.type
= BRW_REGISTER_TYPE_B
;
521 dst_reg
f(this, glsl_type::vec4_type
);
522 emit(VEC4_OPCODE_MOV_BYTES
, f
, src_reg(shifted
));
524 dst_reg
scaled(this, glsl_type::vec4_type
);
525 emit(MUL(scaled
, src_reg(f
), brw_imm_f(1.0f
/ 127.0f
)));
527 dst_reg
max(this, glsl_type::vec4_type
);
528 emit_minmax(BRW_CONDITIONAL_GE
, max
, src_reg(scaled
), brw_imm_f(-1.0f
));
529 emit_minmax(BRW_CONDITIONAL_L
, dst
, src_reg(max
), brw_imm_f(1.0f
));
533 vec4_visitor::emit_pack_unorm_4x8(const dst_reg
&dst
, const src_reg
&src0
)
535 dst_reg
saturated(this, glsl_type::vec4_type
);
536 vec4_instruction
*inst
= emit(MOV(saturated
, src0
));
537 inst
->saturate
= true;
539 dst_reg
scaled(this, glsl_type::vec4_type
);
540 emit(MUL(scaled
, src_reg(saturated
), brw_imm_f(255.0f
)));
542 dst_reg
rounded(this, glsl_type::vec4_type
);
543 emit(RNDE(rounded
, src_reg(scaled
)));
545 dst_reg
u(this, glsl_type::uvec4_type
);
546 emit(MOV(u
, src_reg(rounded
)));
549 emit(VEC4_OPCODE_PACK_BYTES
, dst
, bytes
);
553 vec4_visitor::emit_pack_snorm_4x8(const dst_reg
&dst
, const src_reg
&src0
)
555 dst_reg
max(this, glsl_type::vec4_type
);
556 emit_minmax(BRW_CONDITIONAL_GE
, max
, src0
, brw_imm_f(-1.0f
));
558 dst_reg
min(this, glsl_type::vec4_type
);
559 emit_minmax(BRW_CONDITIONAL_L
, min
, src_reg(max
), brw_imm_f(1.0f
));
561 dst_reg
scaled(this, glsl_type::vec4_type
);
562 emit(MUL(scaled
, src_reg(min
), brw_imm_f(127.0f
)));
564 dst_reg
rounded(this, glsl_type::vec4_type
);
565 emit(RNDE(rounded
, src_reg(scaled
)));
567 dst_reg
i(this, glsl_type::ivec4_type
);
568 emit(MOV(i
, src_reg(rounded
)));
571 emit(VEC4_OPCODE_PACK_BYTES
, dst
, bytes
);
575 * Returns the minimum number of vec4 (as_vec4 == true) or dvec4 (as_vec4 ==
576 * false) elements needed to pack a type.
579 type_size_xvec4(const struct glsl_type
*type
, bool as_vec4
, bool bindless
)
584 switch (type
->base_type
) {
587 case GLSL_TYPE_FLOAT
:
588 case GLSL_TYPE_FLOAT16
:
590 case GLSL_TYPE_DOUBLE
:
591 case GLSL_TYPE_UINT16
:
592 case GLSL_TYPE_INT16
:
593 case GLSL_TYPE_UINT8
:
595 case GLSL_TYPE_UINT64
:
596 case GLSL_TYPE_INT64
:
597 if (type
->is_matrix()) {
598 const glsl_type
*col_type
= type
->column_type();
600 (as_vec4
&& col_type
->is_dual_slot()) ? 2 : 1;
601 return type
->matrix_columns
* col_slots
;
603 /* Regardless of size of vector, it gets a vec4. This is bad
604 * packing for things like floats, but otherwise arrays become a
605 * mess. Hopefully a later pass over the code can pack scalars
606 * down if appropriate.
608 return (as_vec4
&& type
->is_dual_slot()) ? 2 : 1;
610 case GLSL_TYPE_ARRAY
:
611 assert(type
->length
> 0);
612 return type_size_xvec4(type
->fields
.array
, as_vec4
, bindless
) *
614 case GLSL_TYPE_STRUCT
:
615 case GLSL_TYPE_INTERFACE
:
617 for (i
= 0; i
< type
->length
; i
++) {
618 size
+= type_size_xvec4(type
->fields
.structure
[i
].type
, as_vec4
,
622 case GLSL_TYPE_SUBROUTINE
:
625 case GLSL_TYPE_SAMPLER
:
626 /* Samplers take up no register space, since they're baked in at
629 return bindless
? 1 : 0;
630 case GLSL_TYPE_ATOMIC_UINT
:
632 case GLSL_TYPE_IMAGE
:
633 return bindless
? 1 : DIV_ROUND_UP(BRW_IMAGE_PARAM_SIZE
, 4);
635 case GLSL_TYPE_ERROR
:
636 case GLSL_TYPE_FUNCTION
:
637 unreachable("not reached");
644 * Returns the minimum number of vec4 elements needed to pack a type.
646 * For simple types, it will return 1 (a single vec4); for matrices, the
647 * number of columns; for array and struct, the sum of the vec4_size of
648 * each of its elements; and for sampler and atomic, zero.
650 * This method is useful to calculate how much register space is needed to
651 * store a particular type.
654 type_size_vec4(const struct glsl_type
*type
, bool bindless
)
656 return type_size_xvec4(type
, true, bindless
);
660 * Returns the minimum number of dvec4 elements needed to pack a type.
662 * For simple types, it will return 1 (a single dvec4); for matrices, the
663 * number of columns; for array and struct, the sum of the dvec4_size of
664 * each of its elements; and for sampler and atomic, zero.
666 * This method is useful to calculate how much register space is needed to
667 * store a particular type.
669 * Measuring double-precision vertex inputs as dvec4 is required because
670 * ARB_vertex_attrib_64bit states that these uses the same number of locations
671 * than the single-precision version. That is, two consecutives dvec4 would be
672 * located in location "x" and location "x+1", not "x+2".
674 * In order to map vec4/dvec4 vertex inputs in the proper ATTRs,
675 * remap_vs_attrs() will take in account both the location and also if the
676 * type fits in one or two vec4 slots.
679 type_size_dvec4(const struct glsl_type
*type
, bool bindless
)
681 return type_size_xvec4(type
, false, bindless
);
684 src_reg::src_reg(class vec4_visitor
*v
, const struct glsl_type
*type
)
689 this->nr
= v
->alloc
.allocate(type_size_vec4(type
, false));
691 if (type
->is_array() || type
->is_struct()) {
692 this->swizzle
= BRW_SWIZZLE_NOOP
;
694 this->swizzle
= brw_swizzle_for_size(type
->vector_elements
);
697 this->type
= brw_type_for_base_type(type
);
700 src_reg::src_reg(class vec4_visitor
*v
, const struct glsl_type
*type
, int size
)
707 this->nr
= v
->alloc
.allocate(type_size_vec4(type
, false) * size
);
709 this->swizzle
= BRW_SWIZZLE_NOOP
;
711 this->type
= brw_type_for_base_type(type
);
714 dst_reg::dst_reg(class vec4_visitor
*v
, const struct glsl_type
*type
)
719 this->nr
= v
->alloc
.allocate(type_size_vec4(type
, false));
721 if (type
->is_array() || type
->is_struct()) {
722 this->writemask
= WRITEMASK_XYZW
;
724 this->writemask
= (1 << type
->vector_elements
) - 1;
727 this->type
= brw_type_for_base_type(type
);
731 vec4_visitor::emit_minmax(enum brw_conditional_mod conditionalmod
, dst_reg dst
,
732 src_reg src0
, src_reg src1
)
734 vec4_instruction
*inst
= emit(BRW_OPCODE_SEL
, dst
, src0
, src1
);
735 inst
->conditional_mod
= conditionalmod
;
740 vec4_visitor::emit_lrp(const dst_reg
&dst
,
741 const src_reg
&x
, const src_reg
&y
, const src_reg
&a
)
743 if (devinfo
->gen
>= 6 && devinfo
->gen
<= 10) {
744 /* Note that the instruction's argument order is reversed from GLSL
747 return emit(LRP(dst
, fix_3src_operand(a
), fix_3src_operand(y
),
748 fix_3src_operand(x
)));
750 /* Earlier generations don't support three source operations, so we
751 * need to emit x*(1-a) + y*a.
753 dst_reg y_times_a
= dst_reg(this, glsl_type::vec4_type
);
754 dst_reg one_minus_a
= dst_reg(this, glsl_type::vec4_type
);
755 dst_reg x_times_one_minus_a
= dst_reg(this, glsl_type::vec4_type
);
756 y_times_a
.writemask
= dst
.writemask
;
757 one_minus_a
.writemask
= dst
.writemask
;
758 x_times_one_minus_a
.writemask
= dst
.writemask
;
760 emit(MUL(y_times_a
, y
, a
));
761 emit(ADD(one_minus_a
, negate(a
), brw_imm_f(1.0f
)));
762 emit(MUL(x_times_one_minus_a
, x
, src_reg(one_minus_a
)));
763 return emit(ADD(dst
, src_reg(x_times_one_minus_a
), src_reg(y_times_a
)));
768 * Emits the instructions needed to perform a pull constant load. before_block
769 * and before_inst can be NULL in which case the instruction will be appended
770 * to the end of the instruction list.
773 vec4_visitor::emit_pull_constant_load_reg(dst_reg dst
,
776 bblock_t
*before_block
,
777 vec4_instruction
*before_inst
)
779 assert((before_inst
== NULL
&& before_block
== NULL
) ||
780 (before_inst
&& before_block
));
782 vec4_instruction
*pull
;
784 if (devinfo
->gen
>= 9) {
785 /* Gen9+ needs a message header in order to use SIMD4x2 mode */
786 src_reg
header(this, glsl_type::uvec4_type
, 2);
789 vec4_instruction(VS_OPCODE_SET_SIMD4X2_HEADER_GEN9
,
793 emit_before(before_block
, before_inst
, pull
);
797 dst_reg index_reg
= retype(byte_offset(dst_reg(header
), REG_SIZE
),
799 pull
= MOV(writemask(index_reg
, WRITEMASK_X
), offset_reg
);
802 emit_before(before_block
, before_inst
, pull
);
806 pull
= new(mem_ctx
) vec4_instruction(VS_OPCODE_PULL_CONSTANT_LOAD_GEN7
,
811 pull
->header_size
= 1;
812 } else if (devinfo
->gen
>= 7) {
813 dst_reg grf_offset
= dst_reg(this, glsl_type::uint_type
);
815 grf_offset
.type
= offset_reg
.type
;
817 pull
= MOV(grf_offset
, offset_reg
);
820 emit_before(before_block
, before_inst
, pull
);
824 pull
= new(mem_ctx
) vec4_instruction(VS_OPCODE_PULL_CONSTANT_LOAD_GEN7
,
827 src_reg(grf_offset
));
830 pull
= new(mem_ctx
) vec4_instruction(VS_OPCODE_PULL_CONSTANT_LOAD
,
834 pull
->base_mrf
= FIRST_PULL_LOAD_MRF(devinfo
->gen
) + 1;
839 emit_before(before_block
, before_inst
, pull
);
845 vec4_visitor::emit_uniformize(const src_reg
&src
)
847 const src_reg
chan_index(this, glsl_type::uint_type
);
848 const dst_reg dst
= retype(dst_reg(this, glsl_type::uint_type
),
851 emit(SHADER_OPCODE_FIND_LIVE_CHANNEL
, dst_reg(chan_index
))
852 ->force_writemask_all
= true;
853 emit(SHADER_OPCODE_BROADCAST
, dst
, src
, chan_index
)
854 ->force_writemask_all
= true;
860 vec4_visitor::emit_mcs_fetch(const glsl_type
*coordinate_type
,
861 src_reg coordinate
, src_reg surface
)
863 vec4_instruction
*inst
=
864 new(mem_ctx
) vec4_instruction(SHADER_OPCODE_TXF_MCS
,
865 dst_reg(this, glsl_type::uvec4_type
));
867 inst
->src
[1] = surface
;
868 inst
->src
[2] = brw_imm_ud(0); /* sampler */
872 if (devinfo
->gen
>= 9) {
873 /* Gen9+ needs a message header in order to use SIMD4x2 mode */
874 vec4_instruction
*header_inst
= new(mem_ctx
)
875 vec4_instruction(VS_OPCODE_SET_SIMD4X2_HEADER_GEN9
,
876 dst_reg(MRF
, inst
->base_mrf
));
881 inst
->header_size
= 1;
882 param_base
= inst
->base_mrf
+ 1;
885 param_base
= inst
->base_mrf
;
888 /* parameters are: u, v, r, lod; lod will always be zero due to api restrictions */
889 int coord_mask
= (1 << coordinate_type
->vector_elements
) - 1;
890 int zero_mask
= 0xf & ~coord_mask
;
892 emit(MOV(dst_reg(MRF
, param_base
, coordinate_type
, coord_mask
),
895 emit(MOV(dst_reg(MRF
, param_base
, coordinate_type
, zero_mask
),
899 return src_reg(inst
->dst
);
903 vec4_visitor::is_high_sampler(src_reg sampler
)
905 if (devinfo
->gen
< 8 && !devinfo
->is_haswell
)
908 return sampler
.file
!= IMM
|| sampler
.ud
>= 16;
912 vec4_visitor::emit_texture(ir_texture_opcode op
,
914 const glsl_type
*dest_type
,
916 int coord_components
,
917 src_reg shadow_comparator
,
918 src_reg lod
, src_reg lod2
,
919 src_reg sample_index
,
920 uint32_t constant_offset
,
921 src_reg offset_value
,
929 case ir_tex
: opcode
= SHADER_OPCODE_TXL
; break;
930 case ir_txl
: opcode
= SHADER_OPCODE_TXL
; break;
931 case ir_txd
: opcode
= SHADER_OPCODE_TXD
; break;
932 case ir_txf
: opcode
= SHADER_OPCODE_TXF
; break;
933 case ir_txf_ms
: opcode
= (devinfo
->gen
>= 9 ? SHADER_OPCODE_TXF_CMS_W
:
934 SHADER_OPCODE_TXF_CMS
); break;
935 case ir_txs
: opcode
= SHADER_OPCODE_TXS
; break;
936 case ir_tg4
: opcode
= offset_value
.file
!= BAD_FILE
937 ? SHADER_OPCODE_TG4_OFFSET
: SHADER_OPCODE_TG4
; break;
938 case ir_query_levels
: opcode
= SHADER_OPCODE_TXS
; break;
939 case ir_texture_samples
: opcode
= SHADER_OPCODE_SAMPLEINFO
; break;
941 unreachable("TXB is not valid for vertex shaders.");
943 unreachable("LOD is not valid for vertex shaders.");
944 case ir_samples_identical
: {
945 /* There are some challenges implementing this for vec4, and it seems
946 * unlikely to be used anyway. For now, just return false ways.
948 emit(MOV(dest
, brw_imm_ud(0u)));
952 unreachable("Unrecognized tex op");
955 vec4_instruction
*inst
= new(mem_ctx
) vec4_instruction(opcode
, dest
);
957 inst
->offset
= constant_offset
;
959 /* The message header is necessary for:
961 * - Gen9+ for selecting SIMD4x2
963 * - Gather channel selection
964 * - Sampler indices too large to fit in a 4-bit value.
965 * - Sampleinfo message - takes no parameters, but mlen = 0 is illegal
968 (devinfo
->gen
< 5 || devinfo
->gen
>= 9 ||
969 inst
->offset
!= 0 || op
== ir_tg4
||
970 op
== ir_texture_samples
||
971 is_high_sampler(sampler_reg
)) ? 1 : 0;
973 inst
->mlen
= inst
->header_size
;
974 inst
->dst
.writemask
= WRITEMASK_XYZW
;
975 inst
->shadow_compare
= shadow_comparator
.file
!= BAD_FILE
;
977 inst
->src
[1] = surface_reg
;
978 inst
->src
[2] = sampler_reg
;
980 /* MRF for the first parameter */
981 int param_base
= inst
->base_mrf
+ inst
->header_size
;
983 if (op
== ir_txs
|| op
== ir_query_levels
) {
984 int writemask
= devinfo
->gen
== 4 ? WRITEMASK_W
: WRITEMASK_X
;
985 emit(MOV(dst_reg(MRF
, param_base
, lod
.type
, writemask
), lod
));
987 } else if (op
== ir_texture_samples
) {
988 inst
->dst
.writemask
= WRITEMASK_X
;
990 /* Load the coordinate */
991 /* FINISHME: gl_clamp_mask and saturate */
992 int coord_mask
= (1 << coord_components
) - 1;
993 int zero_mask
= 0xf & ~coord_mask
;
995 emit(MOV(dst_reg(MRF
, param_base
, coordinate
.type
, coord_mask
),
999 if (zero_mask
!= 0) {
1000 emit(MOV(dst_reg(MRF
, param_base
, coordinate
.type
, zero_mask
),
1003 /* Load the shadow comparator */
1004 if (shadow_comparator
.file
!= BAD_FILE
&& op
!= ir_txd
&& (op
!= ir_tg4
|| offset_value
.file
== BAD_FILE
)) {
1005 emit(MOV(dst_reg(MRF
, param_base
+ 1, shadow_comparator
.type
,
1007 shadow_comparator
));
1011 /* Load the LOD info */
1012 if (op
== ir_tex
|| op
== ir_txl
) {
1014 if (devinfo
->gen
>= 5) {
1015 mrf
= param_base
+ 1;
1016 if (shadow_comparator
.file
!= BAD_FILE
) {
1017 writemask
= WRITEMASK_Y
;
1018 /* mlen already incremented */
1020 writemask
= WRITEMASK_X
;
1023 } else /* devinfo->gen == 4 */ {
1025 writemask
= WRITEMASK_W
;
1027 emit(MOV(dst_reg(MRF
, mrf
, lod
.type
, writemask
), lod
));
1028 } else if (op
== ir_txf
) {
1029 emit(MOV(dst_reg(MRF
, param_base
, lod
.type
, WRITEMASK_W
), lod
));
1030 } else if (op
== ir_txf_ms
) {
1031 emit(MOV(dst_reg(MRF
, param_base
+ 1, sample_index
.type
, WRITEMASK_X
),
1033 if (opcode
== SHADER_OPCODE_TXF_CMS_W
) {
1034 /* MCS data is stored in the first two channels of ‘mcs’, but we
1035 * need to get it into the .y and .z channels of the second vec4
1038 mcs
.swizzle
= BRW_SWIZZLE4(0, 0, 1, 1);
1039 emit(MOV(dst_reg(MRF
, param_base
+ 1,
1040 glsl_type::uint_type
, WRITEMASK_YZ
),
1042 } else if (devinfo
->gen
>= 7) {
1043 /* MCS data is in the first channel of `mcs`, but we need to get it into
1044 * the .y channel of the second vec4 of params, so replicate .x across
1045 * the whole vec4 and then mask off everything except .y
1047 mcs
.swizzle
= BRW_SWIZZLE_XXXX
;
1048 emit(MOV(dst_reg(MRF
, param_base
+ 1, glsl_type::uint_type
, WRITEMASK_Y
),
1052 } else if (op
== ir_txd
) {
1053 const brw_reg_type type
= lod
.type
;
1055 if (devinfo
->gen
>= 5) {
1056 lod
.swizzle
= BRW_SWIZZLE4(SWIZZLE_X
,SWIZZLE_X
,SWIZZLE_Y
,SWIZZLE_Y
);
1057 lod2
.swizzle
= BRW_SWIZZLE4(SWIZZLE_X
,SWIZZLE_X
,SWIZZLE_Y
,SWIZZLE_Y
);
1058 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_XZ
), lod
));
1059 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_YW
), lod2
));
1062 if (dest_type
->vector_elements
== 3 || shadow_comparator
.file
!= BAD_FILE
) {
1063 lod
.swizzle
= BRW_SWIZZLE_ZZZZ
;
1064 lod2
.swizzle
= BRW_SWIZZLE_ZZZZ
;
1065 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_X
), lod
));
1066 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_Y
), lod2
));
1069 if (shadow_comparator
.file
!= BAD_FILE
) {
1070 emit(MOV(dst_reg(MRF
, param_base
+ 2,
1071 shadow_comparator
.type
, WRITEMASK_Z
),
1072 shadow_comparator
));
1075 } else /* devinfo->gen == 4 */ {
1076 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_XYZ
), lod
));
1077 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_XYZ
), lod2
));
1080 } else if (op
== ir_tg4
&& offset_value
.file
!= BAD_FILE
) {
1081 if (shadow_comparator
.file
!= BAD_FILE
) {
1082 emit(MOV(dst_reg(MRF
, param_base
, shadow_comparator
.type
, WRITEMASK_W
),
1083 shadow_comparator
));
1086 emit(MOV(dst_reg(MRF
, param_base
+ 1, glsl_type::ivec2_type
, WRITEMASK_XY
),
1094 /* fixup num layers (z) for cube arrays: hardware returns faces * layers;
1095 * spec requires layers.
1097 if (op
== ir_txs
&& devinfo
->gen
< 7) {
1098 /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
1099 emit_minmax(BRW_CONDITIONAL_GE
, writemask(inst
->dst
, WRITEMASK_Z
),
1100 src_reg(inst
->dst
), brw_imm_d(1));
1103 if (devinfo
->gen
== 6 && op
== ir_tg4
) {
1104 emit_gen6_gather_wa(key_tex
->gen6_gather_wa
[surface
], inst
->dst
);
1107 if (op
== ir_query_levels
) {
1108 /* # levels is in .w */
1109 src_reg
swizzled(dest
);
1110 swizzled
.swizzle
= BRW_SWIZZLE4(SWIZZLE_W
, SWIZZLE_W
,
1111 SWIZZLE_W
, SWIZZLE_W
);
1112 emit(MOV(dest
, swizzled
));
1117 * Apply workarounds for Gen6 gather with UINT/SINT
1120 vec4_visitor::emit_gen6_gather_wa(uint8_t wa
, dst_reg dst
)
1125 int width
= (wa
& WA_8BIT
) ? 8 : 16;
1126 dst_reg dst_f
= dst
;
1127 dst_f
.type
= BRW_REGISTER_TYPE_F
;
1129 /* Convert from UNORM to UINT */
1130 emit(MUL(dst_f
, src_reg(dst_f
), brw_imm_f((float)((1 << width
) - 1))));
1131 emit(MOV(dst
, src_reg(dst_f
)));
1134 /* Reinterpret the UINT value as a signed INT value by
1135 * shifting the sign bit into place, then shifting back
1138 emit(SHL(dst
, src_reg(dst
), brw_imm_d(32 - width
)));
1139 emit(ASR(dst
, src_reg(dst
), brw_imm_d(32 - width
)));
1144 vec4_visitor::gs_emit_vertex(int /* stream_id */)
1146 unreachable("not reached");
1150 vec4_visitor::gs_end_primitive()
1152 unreachable("not reached");
1156 vec4_visitor::emit_ndc_computation()
1158 if (output_reg
[VARYING_SLOT_POS
][0].file
== BAD_FILE
)
1161 /* Get the position */
1162 src_reg pos
= src_reg(output_reg
[VARYING_SLOT_POS
][0]);
1164 /* Build ndc coords, which are (x/w, y/w, z/w, 1/w) */
1165 dst_reg ndc
= dst_reg(this, glsl_type::vec4_type
);
1166 output_reg
[BRW_VARYING_SLOT_NDC
][0] = ndc
;
1167 output_num_components
[BRW_VARYING_SLOT_NDC
][0] = 4;
1169 current_annotation
= "NDC";
1170 dst_reg ndc_w
= ndc
;
1171 ndc_w
.writemask
= WRITEMASK_W
;
1172 src_reg pos_w
= pos
;
1173 pos_w
.swizzle
= BRW_SWIZZLE4(SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
);
1174 emit_math(SHADER_OPCODE_RCP
, ndc_w
, pos_w
);
1176 dst_reg ndc_xyz
= ndc
;
1177 ndc_xyz
.writemask
= WRITEMASK_XYZ
;
1179 emit(MUL(ndc_xyz
, pos
, src_reg(ndc_w
)));
1183 vec4_visitor::emit_psiz_and_flags(dst_reg reg
)
1185 if (devinfo
->gen
< 6 &&
1186 ((prog_data
->vue_map
.slots_valid
& VARYING_BIT_PSIZ
) ||
1187 output_reg
[VARYING_SLOT_CLIP_DIST0
][0].file
!= BAD_FILE
||
1188 devinfo
->has_negative_rhw_bug
)) {
1189 dst_reg header1
= dst_reg(this, glsl_type::uvec4_type
);
1190 dst_reg header1_w
= header1
;
1191 header1_w
.writemask
= WRITEMASK_W
;
1193 emit(MOV(header1
, brw_imm_ud(0u)));
1195 if (prog_data
->vue_map
.slots_valid
& VARYING_BIT_PSIZ
) {
1196 src_reg psiz
= src_reg(output_reg
[VARYING_SLOT_PSIZ
][0]);
1198 current_annotation
= "Point size";
1199 emit(MUL(header1_w
, psiz
, brw_imm_f((float)(1 << 11))));
1200 emit(AND(header1_w
, src_reg(header1_w
), brw_imm_d(0x7ff << 8)));
1203 if (output_reg
[VARYING_SLOT_CLIP_DIST0
][0].file
!= BAD_FILE
) {
1204 current_annotation
= "Clipping flags";
1205 dst_reg flags0
= dst_reg(this, glsl_type::uint_type
);
1207 emit(CMP(dst_null_f(), src_reg(output_reg
[VARYING_SLOT_CLIP_DIST0
][0]), brw_imm_f(0.0f
), BRW_CONDITIONAL_L
));
1208 emit(VS_OPCODE_UNPACK_FLAGS_SIMD4X2
, flags0
, brw_imm_d(0));
1209 emit(OR(header1_w
, src_reg(header1_w
), src_reg(flags0
)));
1212 if (output_reg
[VARYING_SLOT_CLIP_DIST1
][0].file
!= BAD_FILE
) {
1213 dst_reg flags1
= dst_reg(this, glsl_type::uint_type
);
1214 emit(CMP(dst_null_f(), src_reg(output_reg
[VARYING_SLOT_CLIP_DIST1
][0]), brw_imm_f(0.0f
), BRW_CONDITIONAL_L
));
1215 emit(VS_OPCODE_UNPACK_FLAGS_SIMD4X2
, flags1
, brw_imm_d(0));
1216 emit(SHL(flags1
, src_reg(flags1
), brw_imm_d(4)));
1217 emit(OR(header1_w
, src_reg(header1_w
), src_reg(flags1
)));
1220 /* i965 clipping workaround:
1221 * 1) Test for -ve rhw
1223 * set ndc = (0,0,0,0)
1226 * Later, clipping will detect ucp[6] and ensure the primitive is
1227 * clipped against all fixed planes.
1229 if (devinfo
->has_negative_rhw_bug
&&
1230 output_reg
[BRW_VARYING_SLOT_NDC
][0].file
!= BAD_FILE
) {
1231 src_reg ndc_w
= src_reg(output_reg
[BRW_VARYING_SLOT_NDC
][0]);
1232 ndc_w
.swizzle
= BRW_SWIZZLE_WWWW
;
1233 emit(CMP(dst_null_f(), ndc_w
, brw_imm_f(0.0f
), BRW_CONDITIONAL_L
));
1234 vec4_instruction
*inst
;
1235 inst
= emit(OR(header1_w
, src_reg(header1_w
), brw_imm_ud(1u << 6)));
1236 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1237 output_reg
[BRW_VARYING_SLOT_NDC
][0].type
= BRW_REGISTER_TYPE_F
;
1238 inst
= emit(MOV(output_reg
[BRW_VARYING_SLOT_NDC
][0], brw_imm_f(0.0f
)));
1239 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1242 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_UD
), src_reg(header1
)));
1243 } else if (devinfo
->gen
< 6) {
1244 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_UD
), brw_imm_ud(0u)));
1246 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_D
), brw_imm_d(0)));
1247 if (output_reg
[VARYING_SLOT_PSIZ
][0].file
!= BAD_FILE
) {
1248 dst_reg reg_w
= reg
;
1249 reg_w
.writemask
= WRITEMASK_W
;
1250 src_reg reg_as_src
= src_reg(output_reg
[VARYING_SLOT_PSIZ
][0]);
1251 reg_as_src
.type
= reg_w
.type
;
1252 reg_as_src
.swizzle
= brw_swizzle_for_size(1);
1253 emit(MOV(reg_w
, reg_as_src
));
1255 if (output_reg
[VARYING_SLOT_LAYER
][0].file
!= BAD_FILE
) {
1256 dst_reg reg_y
= reg
;
1257 reg_y
.writemask
= WRITEMASK_Y
;
1258 reg_y
.type
= BRW_REGISTER_TYPE_D
;
1259 output_reg
[VARYING_SLOT_LAYER
][0].type
= reg_y
.type
;
1260 emit(MOV(reg_y
, src_reg(output_reg
[VARYING_SLOT_LAYER
][0])));
1262 if (output_reg
[VARYING_SLOT_VIEWPORT
][0].file
!= BAD_FILE
) {
1263 dst_reg reg_z
= reg
;
1264 reg_z
.writemask
= WRITEMASK_Z
;
1265 reg_z
.type
= BRW_REGISTER_TYPE_D
;
1266 output_reg
[VARYING_SLOT_VIEWPORT
][0].type
= reg_z
.type
;
1267 emit(MOV(reg_z
, src_reg(output_reg
[VARYING_SLOT_VIEWPORT
][0])));
1273 vec4_visitor::emit_generic_urb_slot(dst_reg reg
, int varying
, int component
)
1275 assert(varying
< VARYING_SLOT_MAX
);
1277 unsigned num_comps
= output_num_components
[varying
][component
];
1281 assert(output_reg
[varying
][component
].type
== reg
.type
);
1282 current_annotation
= output_reg_annotation
[varying
];
1283 if (output_reg
[varying
][component
].file
!= BAD_FILE
) {
1284 src_reg src
= src_reg(output_reg
[varying
][component
]);
1285 src
.swizzle
= BRW_SWZ_COMP_OUTPUT(component
);
1287 brw_writemask_for_component_packing(num_comps
, component
);
1288 return emit(MOV(reg
, src
));
1294 vec4_visitor::emit_urb_slot(dst_reg reg
, int varying
)
1296 reg
.type
= BRW_REGISTER_TYPE_F
;
1297 output_reg
[varying
][0].type
= reg
.type
;
1300 case VARYING_SLOT_PSIZ
:
1302 /* PSIZ is always in slot 0, and is coupled with other flags. */
1303 current_annotation
= "indices, point width, clip flags";
1304 emit_psiz_and_flags(reg
);
1307 case BRW_VARYING_SLOT_NDC
:
1308 current_annotation
= "NDC";
1309 if (output_reg
[BRW_VARYING_SLOT_NDC
][0].file
!= BAD_FILE
)
1310 emit(MOV(reg
, src_reg(output_reg
[BRW_VARYING_SLOT_NDC
][0])));
1312 case VARYING_SLOT_POS
:
1313 current_annotation
= "gl_Position";
1314 if (output_reg
[VARYING_SLOT_POS
][0].file
!= BAD_FILE
)
1315 emit(MOV(reg
, src_reg(output_reg
[VARYING_SLOT_POS
][0])));
1317 case VARYING_SLOT_EDGE
: {
1318 /* This is present when doing unfilled polygons. We're supposed to copy
1319 * the edge flag from the user-provided vertex array
1320 * (glEdgeFlagPointer), or otherwise we'll copy from the current value
1321 * of that attribute (starts as 1.0f). This is then used in clipping to
1322 * determine which edges should be drawn as wireframe.
1324 current_annotation
= "edge flag";
1325 int edge_attr
= util_bitcount64(nir
->info
.inputs_read
&
1326 BITFIELD64_MASK(VERT_ATTRIB_EDGEFLAG
));
1327 emit(MOV(reg
, src_reg(dst_reg(ATTR
, edge_attr
,
1328 glsl_type::float_type
, WRITEMASK_XYZW
))));
1331 case BRW_VARYING_SLOT_PAD
:
1332 /* No need to write to this slot */
1335 for (int i
= 0; i
< 4; i
++) {
1336 emit_generic_urb_slot(reg
, varying
, i
);
1343 align_interleaved_urb_mlen(const struct gen_device_info
*devinfo
, unsigned mlen
)
1345 if (devinfo
->gen
>= 6) {
1346 /* URB data written (does not include the message header reg) must
1347 * be a multiple of 256 bits, or 2 VS registers. See vol5c.5,
1348 * section 5.4.3.2.2: URB_INTERLEAVED.
1350 * URB entries are allocated on a multiple of 1024 bits, so an
1351 * extra 128 bits written here to make the end align to 256 is
1354 if ((mlen
% 2) != 1)
1363 * Generates the VUE payload plus the necessary URB write instructions to
1366 * The VUE layout is documented in Volume 2a.
1369 vec4_visitor::emit_vertex()
1371 /* MRF 0 is reserved for the debugger, so start with message header
1376 /* In the process of generating our URB write message contents, we
1377 * may need to unspill a register or load from an array. Those
1378 * reads would use MRFs 14-15.
1380 int max_usable_mrf
= FIRST_SPILL_MRF(devinfo
->gen
);
1382 /* The following assertion verifies that max_usable_mrf causes an
1383 * even-numbered amount of URB write data, which will meet gen6's
1384 * requirements for length alignment.
1386 assert ((max_usable_mrf
- base_mrf
) % 2 == 0);
1388 /* First mrf is the g0-based message header containing URB handles and
1391 emit_urb_write_header(mrf
++);
1393 if (devinfo
->gen
< 6) {
1394 emit_ndc_computation();
1397 /* We may need to split this up into several URB writes, so do them in a
1401 bool complete
= false;
1403 /* URB offset is in URB row increments, and each of our MRFs is half of
1404 * one of those, since we're doing interleaved writes.
1406 int offset
= slot
/ 2;
1409 for (; slot
< prog_data
->vue_map
.num_slots
; ++slot
) {
1410 emit_urb_slot(dst_reg(MRF
, mrf
++),
1411 prog_data
->vue_map
.slot_to_varying
[slot
]);
1413 /* If this was max_usable_mrf, we can't fit anything more into this
1414 * URB WRITE. Same thing if we reached the maximum length available.
1416 if (mrf
> max_usable_mrf
||
1417 align_interleaved_urb_mlen(devinfo
, mrf
- base_mrf
+ 1) > BRW_MAX_MSG_LENGTH
) {
1423 complete
= slot
>= prog_data
->vue_map
.num_slots
;
1424 current_annotation
= "URB write";
1425 vec4_instruction
*inst
= emit_urb_write_opcode(complete
);
1426 inst
->base_mrf
= base_mrf
;
1427 inst
->mlen
= align_interleaved_urb_mlen(devinfo
, mrf
- base_mrf
);
1428 inst
->offset
+= offset
;
1434 vec4_visitor::get_scratch_offset(bblock_t
*block
, vec4_instruction
*inst
,
1435 src_reg
*reladdr
, int reg_offset
)
1437 /* Because we store the values to scratch interleaved like our
1438 * vertex data, we need to scale the vec4 index by 2.
1440 int message_header_scale
= 2;
1442 /* Pre-gen6, the message header uses byte offsets instead of vec4
1443 * (16-byte) offset units.
1445 if (devinfo
->gen
< 6)
1446 message_header_scale
*= 16;
1449 /* A vec4 is 16 bytes and a dvec4 is 32 bytes so for doubles we have
1450 * to multiply the reladdr by 2. Notice that the reg_offset part
1451 * is in units of 16 bytes and is used to select the low/high 16-byte
1452 * chunk of a full dvec4, so we don't want to multiply that part.
1454 src_reg index
= src_reg(this, glsl_type::int_type
);
1455 if (type_sz(inst
->dst
.type
) < 8) {
1456 emit_before(block
, inst
, ADD(dst_reg(index
), *reladdr
,
1457 brw_imm_d(reg_offset
)));
1458 emit_before(block
, inst
, MUL(dst_reg(index
), index
,
1459 brw_imm_d(message_header_scale
)));
1461 emit_before(block
, inst
, MUL(dst_reg(index
), *reladdr
,
1462 brw_imm_d(message_header_scale
* 2)));
1463 emit_before(block
, inst
, ADD(dst_reg(index
), index
,
1464 brw_imm_d(reg_offset
* message_header_scale
)));
1468 return brw_imm_d(reg_offset
* message_header_scale
);
1473 * Emits an instruction before @inst to load the value named by @orig_src
1474 * from scratch space at @base_offset to @temp.
1476 * @base_offset is measured in 32-byte units (the size of a register).
1479 vec4_visitor::emit_scratch_read(bblock_t
*block
, vec4_instruction
*inst
,
1480 dst_reg temp
, src_reg orig_src
,
1483 assert(orig_src
.offset
% REG_SIZE
== 0);
1484 int reg_offset
= base_offset
+ orig_src
.offset
/ REG_SIZE
;
1485 src_reg index
= get_scratch_offset(block
, inst
, orig_src
.reladdr
,
1488 if (type_sz(orig_src
.type
) < 8) {
1489 emit_before(block
, inst
, SCRATCH_READ(temp
, index
));
1491 dst_reg shuffled
= dst_reg(this, glsl_type::dvec4_type
);
1492 dst_reg shuffled_float
= retype(shuffled
, BRW_REGISTER_TYPE_F
);
1493 emit_before(block
, inst
, SCRATCH_READ(shuffled_float
, index
));
1494 index
= get_scratch_offset(block
, inst
, orig_src
.reladdr
, reg_offset
+ 1);
1495 vec4_instruction
*last_read
=
1496 SCRATCH_READ(byte_offset(shuffled_float
, REG_SIZE
), index
);
1497 emit_before(block
, inst
, last_read
);
1498 shuffle_64bit_data(temp
, src_reg(shuffled
), false, block
, last_read
);
1503 * Emits an instruction after @inst to store the value to be written
1504 * to @orig_dst to scratch space at @base_offset, from @temp.
1506 * @base_offset is measured in 32-byte units (the size of a register).
1509 vec4_visitor::emit_scratch_write(bblock_t
*block
, vec4_instruction
*inst
,
1512 assert(inst
->dst
.offset
% REG_SIZE
== 0);
1513 int reg_offset
= base_offset
+ inst
->dst
.offset
/ REG_SIZE
;
1514 src_reg index
= get_scratch_offset(block
, inst
, inst
->dst
.reladdr
,
1517 /* Create a temporary register to store *inst's result in.
1519 * We have to be careful in MOVing from our temporary result register in
1520 * the scratch write. If we swizzle from channels of the temporary that
1521 * weren't initialized, it will confuse live interval analysis, which will
1522 * make spilling fail to make progress.
1524 bool is_64bit
= type_sz(inst
->dst
.type
) == 8;
1525 const glsl_type
*alloc_type
=
1526 is_64bit
? glsl_type::dvec4_type
: glsl_type::vec4_type
;
1527 const src_reg temp
= swizzle(retype(src_reg(this, alloc_type
),
1529 brw_swizzle_for_mask(inst
->dst
.writemask
));
1532 dst_reg dst
= dst_reg(brw_writemask(brw_vec8_grf(0, 0),
1533 inst
->dst
.writemask
));
1534 vec4_instruction
*write
= SCRATCH_WRITE(dst
, temp
, index
);
1535 if (inst
->opcode
!= BRW_OPCODE_SEL
)
1536 write
->predicate
= inst
->predicate
;
1537 write
->ir
= inst
->ir
;
1538 write
->annotation
= inst
->annotation
;
1539 inst
->insert_after(block
, write
);
1541 dst_reg shuffled
= dst_reg(this, alloc_type
);
1542 vec4_instruction
*last
=
1543 shuffle_64bit_data(shuffled
, temp
, true, block
, inst
);
1544 src_reg shuffled_float
= src_reg(retype(shuffled
, BRW_REGISTER_TYPE_F
));
1547 if (inst
->dst
.writemask
& WRITEMASK_X
)
1548 mask
|= WRITEMASK_XY
;
1549 if (inst
->dst
.writemask
& WRITEMASK_Y
)
1550 mask
|= WRITEMASK_ZW
;
1552 dst_reg dst
= dst_reg(brw_writemask(brw_vec8_grf(0, 0), mask
));
1554 vec4_instruction
*write
= SCRATCH_WRITE(dst
, shuffled_float
, index
);
1555 if (inst
->opcode
!= BRW_OPCODE_SEL
)
1556 write
->predicate
= inst
->predicate
;
1557 write
->ir
= inst
->ir
;
1558 write
->annotation
= inst
->annotation
;
1559 last
->insert_after(block
, write
);
1563 if (inst
->dst
.writemask
& WRITEMASK_Z
)
1564 mask
|= WRITEMASK_XY
;
1565 if (inst
->dst
.writemask
& WRITEMASK_W
)
1566 mask
|= WRITEMASK_ZW
;
1568 dst_reg dst
= dst_reg(brw_writemask(brw_vec8_grf(0, 0), mask
));
1570 src_reg index
= get_scratch_offset(block
, inst
, inst
->dst
.reladdr
,
1572 vec4_instruction
*write
=
1573 SCRATCH_WRITE(dst
, byte_offset(shuffled_float
, REG_SIZE
), index
);
1574 if (inst
->opcode
!= BRW_OPCODE_SEL
)
1575 write
->predicate
= inst
->predicate
;
1576 write
->ir
= inst
->ir
;
1577 write
->annotation
= inst
->annotation
;
1578 last
->insert_after(block
, write
);
1582 inst
->dst
.file
= temp
.file
;
1583 inst
->dst
.nr
= temp
.nr
;
1584 inst
->dst
.offset
%= REG_SIZE
;
1585 inst
->dst
.reladdr
= NULL
;
1589 * Checks if \p src and/or \p src.reladdr require a scratch read, and if so,
1590 * adds the scratch read(s) before \p inst. The function also checks for
1591 * recursive reladdr scratch accesses, issuing the corresponding scratch
1592 * loads and rewriting reladdr references accordingly.
1594 * \return \p src if it did not require a scratch load, otherwise, the
1595 * register holding the result of the scratch load that the caller should
1596 * use to rewrite src.
1599 vec4_visitor::emit_resolve_reladdr(int scratch_loc
[], bblock_t
*block
,
1600 vec4_instruction
*inst
, src_reg src
)
1602 /* Resolve recursive reladdr scratch access by calling ourselves
1606 *src
.reladdr
= emit_resolve_reladdr(scratch_loc
, block
, inst
,
1609 /* Now handle scratch access on src */
1610 if (src
.file
== VGRF
&& scratch_loc
[src
.nr
] != -1) {
1611 dst_reg temp
= dst_reg(this, type_sz(src
.type
) == 8 ?
1612 glsl_type::dvec4_type
: glsl_type::vec4_type
);
1613 emit_scratch_read(block
, inst
, temp
, src
, scratch_loc
[src
.nr
]);
1615 src
.offset
%= REG_SIZE
;
1623 * We can't generally support array access in GRF space, because a
1624 * single instruction's destination can only span 2 contiguous
1625 * registers. So, we send all GRF arrays that get variable index
1626 * access to scratch space.
1629 vec4_visitor::move_grf_array_access_to_scratch()
1631 int scratch_loc
[this->alloc
.count
];
1632 memset(scratch_loc
, -1, sizeof(scratch_loc
));
1634 /* First, calculate the set of virtual GRFs that need to be punted
1635 * to scratch due to having any array access on them, and where in
1638 foreach_block_and_inst(block
, vec4_instruction
, inst
, cfg
) {
1639 if (inst
->dst
.file
== VGRF
&& inst
->dst
.reladdr
) {
1640 if (scratch_loc
[inst
->dst
.nr
] == -1) {
1641 scratch_loc
[inst
->dst
.nr
] = last_scratch
;
1642 last_scratch
+= this->alloc
.sizes
[inst
->dst
.nr
];
1645 for (src_reg
*iter
= inst
->dst
.reladdr
;
1647 iter
= iter
->reladdr
) {
1648 if (iter
->file
== VGRF
&& scratch_loc
[iter
->nr
] == -1) {
1649 scratch_loc
[iter
->nr
] = last_scratch
;
1650 last_scratch
+= this->alloc
.sizes
[iter
->nr
];
1655 for (int i
= 0 ; i
< 3; i
++) {
1656 for (src_reg
*iter
= &inst
->src
[i
];
1658 iter
= iter
->reladdr
) {
1659 if (iter
->file
== VGRF
&& scratch_loc
[iter
->nr
] == -1) {
1660 scratch_loc
[iter
->nr
] = last_scratch
;
1661 last_scratch
+= this->alloc
.sizes
[iter
->nr
];
1667 /* Now, for anything that will be accessed through scratch, rewrite
1668 * it to load/store. Note that this is a _safe list walk, because
1669 * we may generate a new scratch_write instruction after the one
1672 foreach_block_and_inst_safe(block
, vec4_instruction
, inst
, cfg
) {
1673 /* Set up the annotation tracking for new generated instructions. */
1675 current_annotation
= inst
->annotation
;
1677 /* First handle scratch access on the dst. Notice we have to handle
1678 * the case where the dst's reladdr also points to scratch space.
1680 if (inst
->dst
.reladdr
)
1681 *inst
->dst
.reladdr
= emit_resolve_reladdr(scratch_loc
, block
, inst
,
1682 *inst
->dst
.reladdr
);
1684 /* Now that we have handled any (possibly recursive) reladdr scratch
1685 * accesses for dst we can safely do the scratch write for dst itself
1687 if (inst
->dst
.file
== VGRF
&& scratch_loc
[inst
->dst
.nr
] != -1)
1688 emit_scratch_write(block
, inst
, scratch_loc
[inst
->dst
.nr
]);
1690 /* Now handle scratch access on any src. In this case, since inst->src[i]
1691 * already is a src_reg, we can just call emit_resolve_reladdr with
1692 * inst->src[i] and it will take care of handling scratch loads for
1693 * both src and src.reladdr (recursively).
1695 for (int i
= 0 ; i
< 3; i
++) {
1696 inst
->src
[i
] = emit_resolve_reladdr(scratch_loc
, block
, inst
,
1703 * Emits an instruction before @inst to load the value named by @orig_src
1704 * from the pull constant buffer (surface) at @base_offset to @temp.
1707 vec4_visitor::emit_pull_constant_load(bblock_t
*block
, vec4_instruction
*inst
,
1708 dst_reg temp
, src_reg orig_src
,
1709 int base_offset
, src_reg indirect
)
1711 assert(orig_src
.offset
% 16 == 0);
1712 const unsigned index
= prog_data
->base
.binding_table
.pull_constants_start
;
1714 /* For 64bit loads we need to emit two 32-bit load messages and we also
1715 * we need to shuffle the 32-bit data result into proper 64-bit data. To do
1716 * that we emit the 32-bit loads into a temporary and we shuffle the result
1717 * into the original destination.
1719 dst_reg orig_temp
= temp
;
1720 bool is_64bit
= type_sz(orig_src
.type
) == 8;
1722 assert(type_sz(temp
.type
) == 8);
1723 dst_reg temp_df
= dst_reg(this, glsl_type::dvec4_type
);
1724 temp
= retype(temp_df
, BRW_REGISTER_TYPE_F
);
1727 src_reg src
= orig_src
;
1728 for (int i
= 0; i
< (is_64bit
? 2 : 1); i
++) {
1729 int reg_offset
= base_offset
+ src
.offset
/ 16;
1732 if (indirect
.file
!= BAD_FILE
) {
1733 offset
= src_reg(this, glsl_type::uint_type
);
1734 emit_before(block
, inst
, ADD(dst_reg(offset
), indirect
,
1735 brw_imm_ud(reg_offset
* 16)));
1736 } else if (devinfo
->gen
>= 8) {
1737 /* Store the offset in a GRF so we can send-from-GRF. */
1738 offset
= src_reg(this, glsl_type::uint_type
);
1739 emit_before(block
, inst
, MOV(dst_reg(offset
),
1740 brw_imm_ud(reg_offset
* 16)));
1742 offset
= brw_imm_d(reg_offset
* 16);
1745 emit_pull_constant_load_reg(byte_offset(temp
, i
* REG_SIZE
),
1750 src
= byte_offset(src
, 16);
1754 temp
= retype(temp
, BRW_REGISTER_TYPE_DF
);
1755 shuffle_64bit_data(orig_temp
, src_reg(temp
), false, block
, inst
);
1760 * Implements array access of uniforms by inserting a
1761 * PULL_CONSTANT_LOAD instruction.
1763 * Unlike temporary GRF array access (where we don't support it due to
1764 * the difficulty of doing relative addressing on instruction
1765 * destinations), we could potentially do array access of uniforms
1766 * that were loaded in GRF space as push constants. In real-world
1767 * usage we've seen, though, the arrays being used are always larger
1768 * than we could load as push constants, so just always move all
1769 * uniform array access out to a pull constant buffer.
1772 vec4_visitor::move_uniform_array_access_to_pull_constants()
1774 /* The vulkan dirver doesn't support pull constants other than UBOs so
1775 * everything has to be pushed regardless.
1777 if (!compiler
->supports_pull_constants
) {
1778 split_uniform_registers();
1782 /* Allocate the pull_params array */
1783 assert(stage_prog_data
->nr_pull_params
== 0);
1784 stage_prog_data
->pull_param
= ralloc_array(mem_ctx
, uint32_t,
1785 this->uniforms
* 4);
1787 int pull_constant_loc
[this->uniforms
];
1788 memset(pull_constant_loc
, -1, sizeof(pull_constant_loc
));
1790 /* First, walk through the instructions and determine which things need to
1791 * be pulled. We mark something as needing to be pulled by setting
1792 * pull_constant_loc to 0.
1794 foreach_block_and_inst(block
, vec4_instruction
, inst
, cfg
) {
1795 /* We only care about MOV_INDIRECT of a uniform */
1796 if (inst
->opcode
!= SHADER_OPCODE_MOV_INDIRECT
||
1797 inst
->src
[0].file
!= UNIFORM
)
1800 int uniform_nr
= inst
->src
[0].nr
+ inst
->src
[0].offset
/ 16;
1802 for (unsigned j
= 0; j
< DIV_ROUND_UP(inst
->src
[2].ud
, 16); j
++)
1803 pull_constant_loc
[uniform_nr
+ j
] = 0;
1806 /* Next, we walk the list of uniforms and assign real pull constant
1807 * locations and set their corresponding entries in pull_param.
1809 for (int j
= 0; j
< this->uniforms
; j
++) {
1810 if (pull_constant_loc
[j
] < 0)
1813 pull_constant_loc
[j
] = stage_prog_data
->nr_pull_params
/ 4;
1815 for (int i
= 0; i
< 4; i
++) {
1816 stage_prog_data
->pull_param
[stage_prog_data
->nr_pull_params
++]
1817 = stage_prog_data
->param
[j
* 4 + i
];
1821 /* Finally, we can walk through the instructions and lower MOV_INDIRECT
1822 * instructions to actual uniform pulls.
1824 foreach_block_and_inst_safe(block
, vec4_instruction
, inst
, cfg
) {
1825 /* We only care about MOV_INDIRECT of a uniform */
1826 if (inst
->opcode
!= SHADER_OPCODE_MOV_INDIRECT
||
1827 inst
->src
[0].file
!= UNIFORM
)
1830 int uniform_nr
= inst
->src
[0].nr
+ inst
->src
[0].offset
/ 16;
1832 assert(inst
->src
[0].swizzle
== BRW_SWIZZLE_NOOP
);
1834 emit_pull_constant_load(block
, inst
, inst
->dst
, inst
->src
[0],
1835 pull_constant_loc
[uniform_nr
], inst
->src
[1]);
1836 inst
->remove(block
);
1839 /* Now there are no accesses of the UNIFORM file with a reladdr, so
1840 * no need to track them as larger-than-vec4 objects. This will be
1841 * relied on in cutting out unused uniform vectors from push
1844 split_uniform_registers();
1848 vec4_visitor::resolve_ud_negate(src_reg
*reg
)
1850 if (reg
->type
!= BRW_REGISTER_TYPE_UD
||
1854 src_reg temp
= src_reg(this, glsl_type::uvec4_type
);
1855 emit(BRW_OPCODE_MOV
, dst_reg(temp
), *reg
);
1859 vec4_visitor::vec4_visitor(const struct brw_compiler
*compiler
,
1861 const struct brw_sampler_prog_key_data
*key_tex
,
1862 struct brw_vue_prog_data
*prog_data
,
1863 const nir_shader
*shader
,
1866 int shader_time_index
)
1867 : backend_shader(compiler
, log_data
, mem_ctx
, shader
, &prog_data
->base
),
1869 prog_data(prog_data
),
1871 first_non_payload_grf(0),
1872 need_all_constants_in_pull_buffer(false),
1873 no_spills(no_spills
),
1874 shader_time_index(shader_time_index
),
1877 this->failed
= false;
1879 this->base_ir
= NULL
;
1880 this->current_annotation
= NULL
;
1881 memset(this->output_reg_annotation
, 0, sizeof(this->output_reg_annotation
));
1883 memset(this->output_num_components
, 0, sizeof(this->output_num_components
));
1885 this->virtual_grf_start
= NULL
;
1886 this->virtual_grf_end
= NULL
;
1887 this->live_intervals
= NULL
;
1889 this->max_grf
= devinfo
->gen
>= 7 ? GEN7_MRF_HACK_START
: BRW_MAX_GRF
;
1896 vec4_visitor::fail(const char *format
, ...)
1906 va_start(va
, format
);
1907 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
1909 msg
= ralloc_asprintf(mem_ctx
, "%s compile failed: %s\n", stage_abbrev
, msg
);
1911 this->fail_msg
= msg
;
1913 if (debug_enabled
) {
1914 fprintf(stderr
, "%s", msg
);
1918 } /* namespace brw */