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
25 #include "glsl/ir_uniform.h"
27 #include "program/sampler.h"
32 vec4_instruction::vec4_instruction(vec4_visitor
*v
,
33 enum opcode opcode
, const dst_reg
&dst
,
34 const src_reg
&src0
, const src_reg
&src1
,
37 this->opcode
= opcode
;
42 this->saturate
= false;
43 this->force_writemask_all
= false;
44 this->no_dd_clear
= false;
45 this->no_dd_check
= false;
46 this->writes_accumulator
= false;
47 this->conditional_mod
= BRW_CONDITIONAL_NONE
;
48 this->texture_offset
= 0;
50 this->shadow_compare
= false;
51 this->ir
= v
->base_ir
;
52 this->urb_write_flags
= BRW_URB_WRITE_NO_FLAGS
;
53 this->header_present
= false;
57 this->annotation
= v
->current_annotation
;
61 vec4_visitor::emit(vec4_instruction
*inst
)
63 this->instructions
.push_tail(inst
);
69 vec4_visitor::emit_before(vec4_instruction
*inst
, vec4_instruction
*new_inst
)
71 new_inst
->ir
= inst
->ir
;
72 new_inst
->annotation
= inst
->annotation
;
74 inst
->insert_before(new_inst
);
80 vec4_visitor::emit(enum opcode opcode
, dst_reg dst
,
81 src_reg src0
, src_reg src1
, src_reg src2
)
83 return emit(new(mem_ctx
) vec4_instruction(this, opcode
, dst
,
89 vec4_visitor::emit(enum opcode opcode
, dst_reg dst
, src_reg src0
, src_reg src1
)
91 return emit(new(mem_ctx
) vec4_instruction(this, opcode
, dst
, src0
, src1
));
95 vec4_visitor::emit(enum opcode opcode
, dst_reg dst
, src_reg src0
)
97 return emit(new(mem_ctx
) vec4_instruction(this, opcode
, dst
, src0
));
101 vec4_visitor::emit(enum opcode opcode
, dst_reg dst
)
103 return emit(new(mem_ctx
) vec4_instruction(this, opcode
, dst
));
107 vec4_visitor::emit(enum opcode opcode
)
109 return emit(new(mem_ctx
) vec4_instruction(this, opcode
, dst_reg()));
114 vec4_visitor::op(const dst_reg &dst, const src_reg &src0) \
116 return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \
122 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
123 const src_reg &src1) \
125 return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \
129 #define ALU2_ACC(op) \
131 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
132 const src_reg &src1) \
134 vec4_instruction *inst = new(mem_ctx) vec4_instruction(this, \
135 BRW_OPCODE_##op, dst, src0, src1); \
136 inst->writes_accumulator = true; \
142 vec4_visitor::op(const dst_reg &dst, const src_reg &src0, \
143 const src_reg &src1, const src_reg &src2) \
145 assert(brw->gen >= 6); \
146 return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \
183 /** Gen4 predicated IF. */
185 vec4_visitor::IF(enum brw_predicate predicate
)
187 vec4_instruction
*inst
;
189 inst
= new(mem_ctx
) vec4_instruction(this, BRW_OPCODE_IF
);
190 inst
->predicate
= predicate
;
195 /** Gen6 IF with embedded comparison. */
197 vec4_visitor::IF(src_reg src0
, src_reg src1
,
198 enum brw_conditional_mod condition
)
200 assert(brw
->gen
== 6);
202 vec4_instruction
*inst
;
204 resolve_ud_negate(&src0
);
205 resolve_ud_negate(&src1
);
207 inst
= new(mem_ctx
) vec4_instruction(this, BRW_OPCODE_IF
, dst_null_d(),
209 inst
->conditional_mod
= condition
;
215 * CMP: Sets the low bit of the destination channels with the result
216 * of the comparison, while the upper bits are undefined, and updates
217 * the flag register with the packed 16 bits of the result.
220 vec4_visitor::CMP(dst_reg dst
, src_reg src0
, src_reg src1
,
221 enum brw_conditional_mod condition
)
223 vec4_instruction
*inst
;
225 /* original gen4 does type conversion to the destination type
226 * before before comparison, producing garbage results for floating
230 dst
.type
= src0
.type
;
231 if (dst
.file
== HW_REG
)
232 dst
.fixed_hw_reg
.type
= dst
.type
;
235 resolve_ud_negate(&src0
);
236 resolve_ud_negate(&src1
);
238 inst
= new(mem_ctx
) vec4_instruction(this, BRW_OPCODE_CMP
, dst
, src0
, src1
);
239 inst
->conditional_mod
= condition
;
245 vec4_visitor::SCRATCH_READ(const dst_reg
&dst
, const src_reg
&index
)
247 vec4_instruction
*inst
;
249 inst
= new(mem_ctx
) vec4_instruction(this, SHADER_OPCODE_GEN4_SCRATCH_READ
,
258 vec4_visitor::SCRATCH_WRITE(const dst_reg
&dst
, const src_reg
&src
,
259 const src_reg
&index
)
261 vec4_instruction
*inst
;
263 inst
= new(mem_ctx
) vec4_instruction(this, SHADER_OPCODE_GEN4_SCRATCH_WRITE
,
272 vec4_visitor::emit_dp(dst_reg dst
, src_reg src0
, src_reg src1
, unsigned elements
)
274 static enum opcode dot_opcodes
[] = {
275 BRW_OPCODE_DP2
, BRW_OPCODE_DP3
, BRW_OPCODE_DP4
278 emit(dot_opcodes
[elements
- 2], dst
, src0
, src1
);
282 vec4_visitor::fix_3src_operand(src_reg src
)
284 /* Using vec4 uniforms in SIMD4x2 programs is difficult. You'd like to be
285 * able to use vertical stride of zero to replicate the vec4 uniform, like
287 * g3<0;4,1>:f - [0, 4][1, 5][2, 6][3, 7]
289 * But you can't, since vertical stride is always four in three-source
290 * instructions. Instead, insert a MOV instruction to do the replication so
291 * that the three-source instruction can consume it.
294 /* The MOV is only needed if the source is a uniform or immediate. */
295 if (src
.file
!= UNIFORM
&& src
.file
!= IMM
)
298 if (src
.file
== UNIFORM
&& brw_is_single_value_swizzle(src
.swizzle
))
301 dst_reg expanded
= dst_reg(this, glsl_type::vec4_type
);
302 expanded
.type
= src
.type
;
303 emit(MOV(expanded
, src
));
304 return src_reg(expanded
);
308 vec4_visitor::fix_math_operand(src_reg src
)
310 /* The gen6 math instruction ignores the source modifiers --
311 * swizzle, abs, negate, and at least some parts of the register
312 * region description.
314 * Rather than trying to enumerate all these cases, *always* expand the
315 * operand to a temp GRF for gen6.
317 * For gen7, keep the operand as-is, except if immediate, which gen7 still
321 if (brw
->gen
== 7 && src
.file
!= IMM
)
324 dst_reg expanded
= dst_reg(this, glsl_type::vec4_type
);
325 expanded
.type
= src
.type
;
326 emit(MOV(expanded
, src
));
327 return src_reg(expanded
);
331 vec4_visitor::emit_math1_gen6(enum opcode opcode
, dst_reg dst
, src_reg src
)
333 src
= fix_math_operand(src
);
335 if (brw
->gen
== 6 && dst
.writemask
!= WRITEMASK_XYZW
) {
336 /* The gen6 math instruction must be align1, so we can't do
339 dst_reg temp_dst
= dst_reg(this, glsl_type::vec4_type
);
341 emit(opcode
, temp_dst
, src
);
343 emit(MOV(dst
, src_reg(temp_dst
)));
345 emit(opcode
, dst
, src
);
350 vec4_visitor::emit_math1_gen4(enum opcode opcode
, dst_reg dst
, src_reg src
)
352 vec4_instruction
*inst
= emit(opcode
, dst
, src
);
358 vec4_visitor::emit_math(opcode opcode
, dst_reg dst
, src_reg src
)
361 case SHADER_OPCODE_RCP
:
362 case SHADER_OPCODE_RSQ
:
363 case SHADER_OPCODE_SQRT
:
364 case SHADER_OPCODE_EXP2
:
365 case SHADER_OPCODE_LOG2
:
366 case SHADER_OPCODE_SIN
:
367 case SHADER_OPCODE_COS
:
370 unreachable("not reached: bad math opcode");
374 emit(opcode
, dst
, src
);
375 } else if (brw
->gen
>= 6) {
376 emit_math1_gen6(opcode
, dst
, src
);
378 emit_math1_gen4(opcode
, dst
, src
);
383 vec4_visitor::emit_math2_gen6(enum opcode opcode
,
384 dst_reg dst
, src_reg src0
, src_reg src1
)
386 src0
= fix_math_operand(src0
);
387 src1
= fix_math_operand(src1
);
389 if (brw
->gen
== 6 && dst
.writemask
!= WRITEMASK_XYZW
) {
390 /* The gen6 math instruction must be align1, so we can't do
393 dst_reg temp_dst
= dst_reg(this, glsl_type::vec4_type
);
394 temp_dst
.type
= dst
.type
;
396 emit(opcode
, temp_dst
, src0
, src1
);
398 emit(MOV(dst
, src_reg(temp_dst
)));
400 emit(opcode
, dst
, src0
, src1
);
405 vec4_visitor::emit_math2_gen4(enum opcode opcode
,
406 dst_reg dst
, src_reg src0
, src_reg src1
)
408 vec4_instruction
*inst
= emit(opcode
, dst
, src0
, src1
);
414 vec4_visitor::emit_math(enum opcode opcode
,
415 dst_reg dst
, src_reg src0
, src_reg src1
)
418 case SHADER_OPCODE_POW
:
419 case SHADER_OPCODE_INT_QUOTIENT
:
420 case SHADER_OPCODE_INT_REMAINDER
:
423 unreachable("not reached: unsupported binary math opcode");
427 emit(opcode
, dst
, src0
, src1
);
428 } else if (brw
->gen
>= 6) {
429 emit_math2_gen6(opcode
, dst
, src0
, src1
);
431 emit_math2_gen4(opcode
, dst
, src0
, src1
);
436 vec4_visitor::emit_pack_half_2x16(dst_reg dst
, src_reg src0
)
439 unreachable("ir_unop_pack_half_2x16 should be lowered");
442 assert(dst
.type
== BRW_REGISTER_TYPE_UD
);
443 assert(src0
.type
== BRW_REGISTER_TYPE_F
);
445 /* From the Ivybridge PRM, Vol4, Part3, Section 6.27 f32to16:
447 * Because this instruction does not have a 16-bit floating-point type,
448 * the destination data type must be Word (W).
450 * The destination must be DWord-aligned and specify a horizontal stride
451 * (HorzStride) of 2. The 16-bit result is stored in the lower word of
452 * each destination channel and the upper word is not modified.
454 * The above restriction implies that the f32to16 instruction must use
455 * align1 mode, because only in align1 mode is it possible to specify
456 * horizontal stride. We choose here to defy the hardware docs and emit
457 * align16 instructions.
459 * (I [chadv] did attempt to emit align1 instructions for VS f32to16
460 * instructions. I was partially successful in that the code passed all
461 * tests. However, the code was dubiously correct and fragile, and the
462 * tests were not harsh enough to probe that frailty. Not trusting the
463 * code, I chose instead to remain in align16 mode in defiance of the hw
466 * I've [chadv] experimentally confirmed that, on gen7 hardware and the
467 * simulator, emitting a f32to16 in align16 mode with UD as destination
468 * data type is safe. The behavior differs from that specified in the PRM
469 * in that the upper word of each destination channel is cleared to 0.
472 dst_reg
tmp_dst(this, glsl_type::uvec2_type
);
473 src_reg
tmp_src(tmp_dst
);
476 /* Verify the undocumented behavior on which the following instructions
477 * rely. If f32to16 fails to clear the upper word of the X and Y channels,
478 * then the result of the bit-or instruction below will be incorrect.
480 * You should inspect the disasm output in order to verify that the MOV is
481 * not optimized away.
483 emit(MOV(tmp_dst
, src_reg(0x12345678u
)));
486 /* Give tmp the form below, where "." means untouched.
489 * |.|.|0x0000hhhh|0x0000llll|.|.|0x0000hhhh|0x0000llll|
491 * That the upper word of each write-channel be 0 is required for the
492 * following bit-shift and bit-or instructions to work. Note that this
493 * relies on the undocumented hardware behavior mentioned above.
495 tmp_dst
.writemask
= WRITEMASK_XY
;
496 emit(F32TO16(tmp_dst
, src0
));
498 /* Give the write-channels of dst the form:
501 tmp_src
.swizzle
= BRW_SWIZZLE_YYYY
;
502 emit(SHL(dst
, tmp_src
, src_reg(16u)));
504 /* Finally, give the write-channels of dst the form of packHalf2x16's
508 tmp_src
.swizzle
= BRW_SWIZZLE_XXXX
;
509 emit(OR(dst
, src_reg(dst
), tmp_src
));
513 vec4_visitor::emit_unpack_half_2x16(dst_reg dst
, src_reg src0
)
516 unreachable("ir_unop_unpack_half_2x16 should be lowered");
519 assert(dst
.type
== BRW_REGISTER_TYPE_F
);
520 assert(src0
.type
== BRW_REGISTER_TYPE_UD
);
522 /* From the Ivybridge PRM, Vol4, Part3, Section 6.26 f16to32:
524 * Because this instruction does not have a 16-bit floating-point type,
525 * the source data type must be Word (W). The destination type must be
528 * To use W as the source data type, we must adjust horizontal strides,
529 * which is only possible in align1 mode. All my [chadv] attempts at
530 * emitting align1 instructions for unpackHalf2x16 failed to pass the
531 * Piglit tests, so I gave up.
533 * I've verified that, on gen7 hardware and the simulator, it is safe to
534 * emit f16to32 in align16 mode with UD as source data type.
537 dst_reg
tmp_dst(this, glsl_type::uvec2_type
);
538 src_reg
tmp_src(tmp_dst
);
540 tmp_dst
.writemask
= WRITEMASK_X
;
541 emit(AND(tmp_dst
, src0
, src_reg(0xffffu
)));
543 tmp_dst
.writemask
= WRITEMASK_Y
;
544 emit(SHR(tmp_dst
, src0
, src_reg(16u)));
546 dst
.writemask
= WRITEMASK_XY
;
547 emit(F16TO32(dst
, tmp_src
));
551 vec4_visitor::visit_instructions(const exec_list
*list
)
553 foreach_in_list(ir_instruction
, ir
, list
) {
561 type_size(const struct glsl_type
*type
)
566 switch (type
->base_type
) {
569 case GLSL_TYPE_FLOAT
:
571 if (type
->is_matrix()) {
572 return type
->matrix_columns
;
574 /* Regardless of size of vector, it gets a vec4. This is bad
575 * packing for things like floats, but otherwise arrays become a
576 * mess. Hopefully a later pass over the code can pack scalars
577 * down if appropriate.
581 case GLSL_TYPE_ARRAY
:
582 assert(type
->length
> 0);
583 return type_size(type
->fields
.array
) * type
->length
;
584 case GLSL_TYPE_STRUCT
:
586 for (i
= 0; i
< type
->length
; i
++) {
587 size
+= type_size(type
->fields
.structure
[i
].type
);
590 case GLSL_TYPE_SAMPLER
:
591 /* Samplers take up one slot in UNIFORMS[], but they're baked in
595 case GLSL_TYPE_ATOMIC_UINT
:
597 case GLSL_TYPE_IMAGE
:
599 case GLSL_TYPE_ERROR
:
600 case GLSL_TYPE_INTERFACE
:
601 unreachable("not reached");
608 vec4_visitor::virtual_grf_alloc(int size
)
610 if (virtual_grf_array_size
<= virtual_grf_count
) {
611 if (virtual_grf_array_size
== 0)
612 virtual_grf_array_size
= 16;
614 virtual_grf_array_size
*= 2;
615 virtual_grf_sizes
= reralloc(mem_ctx
, virtual_grf_sizes
, int,
616 virtual_grf_array_size
);
617 virtual_grf_reg_map
= reralloc(mem_ctx
, virtual_grf_reg_map
, int,
618 virtual_grf_array_size
);
620 virtual_grf_reg_map
[virtual_grf_count
] = virtual_grf_reg_count
;
621 virtual_grf_reg_count
+= size
;
622 virtual_grf_sizes
[virtual_grf_count
] = size
;
623 return virtual_grf_count
++;
626 src_reg::src_reg(class vec4_visitor
*v
, const struct glsl_type
*type
)
631 this->reg
= v
->virtual_grf_alloc(type_size(type
));
633 if (type
->is_array() || type
->is_record()) {
634 this->swizzle
= BRW_SWIZZLE_NOOP
;
636 this->swizzle
= swizzle_for_size(type
->vector_elements
);
639 this->type
= brw_type_for_base_type(type
);
642 dst_reg::dst_reg(class vec4_visitor
*v
, const struct glsl_type
*type
)
647 this->reg
= v
->virtual_grf_alloc(type_size(type
));
649 if (type
->is_array() || type
->is_record()) {
650 this->writemask
= WRITEMASK_XYZW
;
652 this->writemask
= (1 << type
->vector_elements
) - 1;
655 this->type
= brw_type_for_base_type(type
);
658 /* Our support for uniforms is piggy-backed on the struct
659 * gl_fragment_program, because that's where the values actually
660 * get stored, rather than in some global gl_shader_program uniform
664 vec4_visitor::setup_uniform_values(ir_variable
*ir
)
666 int namelen
= strlen(ir
->name
);
668 /* The data for our (non-builtin) uniforms is stored in a series of
669 * gl_uniform_driver_storage structs for each subcomponent that
670 * glGetUniformLocation() could name. We know it's been set up in the same
671 * order we'd walk the type, so walk the list of storage and find anything
672 * with our name, or the prefix of a component that starts with our name.
674 for (unsigned u
= 0; u
< shader_prog
->NumUserUniformStorage
; u
++) {
675 struct gl_uniform_storage
*storage
= &shader_prog
->UniformStorage
[u
];
677 if (strncmp(ir
->name
, storage
->name
, namelen
) != 0 ||
678 (storage
->name
[namelen
] != 0 &&
679 storage
->name
[namelen
] != '.' &&
680 storage
->name
[namelen
] != '[')) {
684 gl_constant_value
*components
= storage
->storage
;
685 unsigned vector_count
= (MAX2(storage
->array_elements
, 1) *
686 storage
->type
->matrix_columns
);
688 for (unsigned s
= 0; s
< vector_count
; s
++) {
689 assert(uniforms
< uniform_array_size
);
690 uniform_vector_size
[uniforms
] = storage
->type
->vector_elements
;
693 for (i
= 0; i
< uniform_vector_size
[uniforms
]; i
++) {
694 stage_prog_data
->param
[uniforms
* 4 + i
] = components
;
698 static gl_constant_value zero
= { 0.0 };
699 stage_prog_data
->param
[uniforms
* 4 + i
] = &zero
;
708 vec4_visitor::setup_uniform_clipplane_values()
710 gl_clip_plane
*clip_planes
= brw_select_clip_planes(ctx
);
712 for (int i
= 0; i
< key
->nr_userclip_plane_consts
; ++i
) {
713 assert(this->uniforms
< uniform_array_size
);
714 this->uniform_vector_size
[this->uniforms
] = 4;
715 this->userplane
[i
] = dst_reg(UNIFORM
, this->uniforms
);
716 this->userplane
[i
].type
= BRW_REGISTER_TYPE_F
;
717 for (int j
= 0; j
< 4; ++j
) {
718 stage_prog_data
->param
[this->uniforms
* 4 + j
] =
719 (gl_constant_value
*) &clip_planes
[i
][j
];
725 /* Our support for builtin uniforms is even scarier than non-builtin.
726 * It sits on top of the PROG_STATE_VAR parameters that are
727 * automatically updated from GL context state.
730 vec4_visitor::setup_builtin_uniform_values(ir_variable
*ir
)
732 const ir_state_slot
*const slots
= ir
->state_slots
;
733 assert(ir
->state_slots
!= NULL
);
735 for (unsigned int i
= 0; i
< ir
->num_state_slots
; i
++) {
736 /* This state reference has already been setup by ir_to_mesa,
737 * but we'll get the same index back here. We can reference
738 * ParameterValues directly, since unlike brw_fs.cpp, we never
739 * add new state references during compile.
741 int index
= _mesa_add_state_reference(this->prog
->Parameters
,
742 (gl_state_index
*)slots
[i
].tokens
);
743 gl_constant_value
*values
=
744 &this->prog
->Parameters
->ParameterValues
[index
][0];
746 assert(this->uniforms
< uniform_array_size
);
747 this->uniform_vector_size
[this->uniforms
] = 0;
748 /* Add each of the unique swizzled channels of the element.
749 * This will end up matching the size of the glsl_type of this field.
752 for (unsigned int j
= 0; j
< 4; j
++) {
753 int swiz
= GET_SWZ(slots
[i
].swizzle
, j
);
756 stage_prog_data
->param
[this->uniforms
* 4 + j
] = &values
[swiz
];
757 assert(this->uniforms
< uniform_array_size
);
758 if (swiz
<= last_swiz
)
759 this->uniform_vector_size
[this->uniforms
]++;
766 vec4_visitor::variable_storage(ir_variable
*var
)
768 return (dst_reg
*)hash_table_find(this->variable_ht
, var
);
772 vec4_visitor::emit_bool_to_cond_code(ir_rvalue
*ir
,
773 enum brw_predicate
*predicate
)
775 ir_expression
*expr
= ir
->as_expression();
777 *predicate
= BRW_PREDICATE_NORMAL
;
781 vec4_instruction
*inst
;
783 assert(expr
->get_num_operands() <= 2);
784 for (unsigned int i
= 0; i
< expr
->get_num_operands(); i
++) {
785 expr
->operands
[i
]->accept(this);
786 op
[i
] = this->result
;
788 resolve_ud_negate(&op
[i
]);
791 switch (expr
->operation
) {
792 case ir_unop_logic_not
:
793 inst
= emit(AND(dst_null_d(), op
[0], src_reg(1)));
794 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
797 case ir_binop_logic_xor
:
798 inst
= emit(XOR(dst_null_d(), op
[0], op
[1]));
799 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
802 case ir_binop_logic_or
:
803 inst
= emit(OR(dst_null_d(), op
[0], op
[1]));
804 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
807 case ir_binop_logic_and
:
808 inst
= emit(AND(dst_null_d(), op
[0], op
[1]));
809 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
814 emit(CMP(dst_null_d(), op
[0], src_reg(0.0f
), BRW_CONDITIONAL_NZ
));
816 inst
= emit(MOV(dst_null_f(), op
[0]));
817 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
823 emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
825 inst
= emit(MOV(dst_null_d(), op
[0]));
826 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
830 case ir_binop_all_equal
:
831 inst
= emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_Z
));
832 *predicate
= BRW_PREDICATE_ALIGN16_ALL4H
;
835 case ir_binop_any_nequal
:
836 inst
= emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_NZ
));
837 *predicate
= BRW_PREDICATE_ALIGN16_ANY4H
;
841 inst
= emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
842 *predicate
= BRW_PREDICATE_ALIGN16_ANY4H
;
845 case ir_binop_greater
:
846 case ir_binop_gequal
:
848 case ir_binop_lequal
:
850 case ir_binop_nequal
:
851 emit(CMP(dst_null_d(), op
[0], op
[1],
852 brw_conditional_for_comparison(expr
->operation
)));
856 unreachable("not reached");
863 resolve_ud_negate(&this->result
);
866 vec4_instruction
*inst
= emit(AND(dst_null_d(),
867 this->result
, src_reg(1)));
868 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
870 vec4_instruction
*inst
= emit(MOV(dst_null_d(), this->result
));
871 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
876 * Emit a gen6 IF statement with the comparison folded into the IF
880 vec4_visitor::emit_if_gen6(ir_if
*ir
)
882 ir_expression
*expr
= ir
->condition
->as_expression();
888 assert(expr
->get_num_operands() <= 2);
889 for (unsigned int i
= 0; i
< expr
->get_num_operands(); i
++) {
890 expr
->operands
[i
]->accept(this);
891 op
[i
] = this->result
;
894 switch (expr
->operation
) {
895 case ir_unop_logic_not
:
896 emit(IF(op
[0], src_reg(0), BRW_CONDITIONAL_Z
));
899 case ir_binop_logic_xor
:
900 emit(IF(op
[0], op
[1], BRW_CONDITIONAL_NZ
));
903 case ir_binop_logic_or
:
904 temp
= dst_reg(this, glsl_type::bool_type
);
905 emit(OR(temp
, op
[0], op
[1]));
906 emit(IF(src_reg(temp
), src_reg(0), BRW_CONDITIONAL_NZ
));
909 case ir_binop_logic_and
:
910 temp
= dst_reg(this, glsl_type::bool_type
);
911 emit(AND(temp
, op
[0], op
[1]));
912 emit(IF(src_reg(temp
), src_reg(0), BRW_CONDITIONAL_NZ
));
916 emit(IF(op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
920 emit(IF(op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
923 case ir_binop_greater
:
924 case ir_binop_gequal
:
926 case ir_binop_lequal
:
928 case ir_binop_nequal
:
929 emit(IF(op
[0], op
[1],
930 brw_conditional_for_comparison(expr
->operation
)));
933 case ir_binop_all_equal
:
934 emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_Z
));
935 emit(IF(BRW_PREDICATE_ALIGN16_ALL4H
));
938 case ir_binop_any_nequal
:
939 emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_NZ
));
940 emit(IF(BRW_PREDICATE_ALIGN16_ANY4H
));
944 emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
945 emit(IF(BRW_PREDICATE_ALIGN16_ANY4H
));
949 unreachable("not reached");
954 ir
->condition
->accept(this);
956 emit(IF(this->result
, src_reg(0), BRW_CONDITIONAL_NZ
));
960 vec4_visitor::visit(ir_variable
*ir
)
964 if (variable_storage(ir
))
967 switch (ir
->data
.mode
) {
968 case ir_var_shader_in
:
969 reg
= new(mem_ctx
) dst_reg(ATTR
, ir
->data
.location
);
972 case ir_var_shader_out
:
973 reg
= new(mem_ctx
) dst_reg(this, ir
->type
);
975 for (int i
= 0; i
< type_size(ir
->type
); i
++) {
976 output_reg
[ir
->data
.location
+ i
] = *reg
;
977 output_reg
[ir
->data
.location
+ i
].reg_offset
= i
;
978 output_reg
[ir
->data
.location
+ i
].type
=
979 brw_type_for_base_type(ir
->type
->get_scalar_type());
980 output_reg_annotation
[ir
->data
.location
+ i
] = ir
->name
;
985 case ir_var_temporary
:
986 reg
= new(mem_ctx
) dst_reg(this, ir
->type
);
990 reg
= new(this->mem_ctx
) dst_reg(UNIFORM
, this->uniforms
);
992 /* Thanks to the lower_ubo_reference pass, we will see only
993 * ir_binop_ubo_load expressions and not ir_dereference_variable for UBO
994 * variables, so no need for them to be in variable_ht.
996 * Atomic counters take no uniform storage, no need to do
999 if (ir
->is_in_uniform_block() || ir
->type
->contains_atomic())
1002 /* Track how big the whole uniform variable is, in case we need to put a
1003 * copy of its data into pull constants for array access.
1005 assert(this->uniforms
< uniform_array_size
);
1006 this->uniform_size
[this->uniforms
] = type_size(ir
->type
);
1008 if (!strncmp(ir
->name
, "gl_", 3)) {
1009 setup_builtin_uniform_values(ir
);
1011 setup_uniform_values(ir
);
1015 case ir_var_system_value
:
1016 reg
= make_reg_for_system_value(ir
);
1020 unreachable("not reached");
1023 reg
->type
= brw_type_for_base_type(ir
->type
);
1024 hash_table_insert(this->variable_ht
, reg
, ir
);
1028 vec4_visitor::visit(ir_loop
*ir
)
1030 /* We don't want debugging output to print the whole body of the
1031 * loop as the annotation.
1033 this->base_ir
= NULL
;
1035 emit(BRW_OPCODE_DO
);
1037 visit_instructions(&ir
->body_instructions
);
1039 emit(BRW_OPCODE_WHILE
);
1043 vec4_visitor::visit(ir_loop_jump
*ir
)
1046 case ir_loop_jump::jump_break
:
1047 emit(BRW_OPCODE_BREAK
);
1049 case ir_loop_jump::jump_continue
:
1050 emit(BRW_OPCODE_CONTINUE
);
1057 vec4_visitor::visit(ir_function_signature
*)
1059 unreachable("not reached");
1063 vec4_visitor::visit(ir_function
*ir
)
1065 /* Ignore function bodies other than main() -- we shouldn't see calls to
1066 * them since they should all be inlined.
1068 if (strcmp(ir
->name
, "main") == 0) {
1069 const ir_function_signature
*sig
;
1072 sig
= ir
->matching_signature(NULL
, &empty
, false);
1076 visit_instructions(&sig
->body
);
1081 vec4_visitor::try_emit_sat(ir_expression
*ir
)
1083 ir_rvalue
*sat_src
= ir
->as_rvalue_to_saturate();
1087 sat_src
->accept(this);
1088 src_reg src
= this->result
;
1090 this->result
= src_reg(this, ir
->type
);
1091 vec4_instruction
*inst
;
1092 inst
= emit(MOV(dst_reg(this->result
), src
));
1093 inst
->saturate
= true;
1099 vec4_visitor::try_emit_mad(ir_expression
*ir
)
1101 /* 3-src instructions were introduced in gen6. */
1105 /* MAD can only handle floating-point data. */
1106 if (ir
->type
->base_type
!= GLSL_TYPE_FLOAT
)
1109 ir_rvalue
*nonmul
= ir
->operands
[1];
1110 ir_expression
*mul
= ir
->operands
[0]->as_expression();
1112 if (!mul
|| mul
->operation
!= ir_binop_mul
) {
1113 nonmul
= ir
->operands
[0];
1114 mul
= ir
->operands
[1]->as_expression();
1116 if (!mul
|| mul
->operation
!= ir_binop_mul
)
1120 nonmul
->accept(this);
1121 src_reg src0
= fix_3src_operand(this->result
);
1123 mul
->operands
[0]->accept(this);
1124 src_reg src1
= fix_3src_operand(this->result
);
1126 mul
->operands
[1]->accept(this);
1127 src_reg src2
= fix_3src_operand(this->result
);
1129 this->result
= src_reg(this, ir
->type
);
1130 emit(BRW_OPCODE_MAD
, dst_reg(this->result
), src0
, src1
, src2
);
1136 vec4_visitor::try_emit_b2f_of_compare(ir_expression
*ir
)
1138 /* This optimization relies on CMP setting the destination to 0 when
1139 * false. Early hardware only sets the least significant bit, and
1140 * leaves the other bits undefined. So we can't use it.
1145 ir_expression
*const cmp
= ir
->operands
[0]->as_expression();
1150 switch (cmp
->operation
) {
1152 case ir_binop_greater
:
1153 case ir_binop_lequal
:
1154 case ir_binop_gequal
:
1155 case ir_binop_equal
:
1156 case ir_binop_nequal
:
1163 cmp
->operands
[0]->accept(this);
1164 const src_reg cmp_src0
= this->result
;
1166 cmp
->operands
[1]->accept(this);
1167 const src_reg cmp_src1
= this->result
;
1169 this->result
= src_reg(this, ir
->type
);
1171 emit(CMP(dst_reg(this->result
), cmp_src0
, cmp_src1
,
1172 brw_conditional_for_comparison(cmp
->operation
)));
1174 /* If the comparison is false, this->result will just happen to be zero.
1176 vec4_instruction
*const inst
= emit(BRW_OPCODE_SEL
, dst_reg(this->result
),
1177 this->result
, src_reg(1.0f
));
1178 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1179 inst
->predicate_inverse
= true;
1185 vec4_visitor::emit_minmax(enum brw_conditional_mod conditionalmod
, dst_reg dst
,
1186 src_reg src0
, src_reg src1
)
1188 vec4_instruction
*inst
;
1190 if (brw
->gen
>= 6) {
1191 inst
= emit(BRW_OPCODE_SEL
, dst
, src0
, src1
);
1192 inst
->conditional_mod
= conditionalmod
;
1194 emit(CMP(dst
, src0
, src1
, conditionalmod
));
1196 inst
= emit(BRW_OPCODE_SEL
, dst
, src0
, src1
);
1197 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1202 vec4_visitor::emit_lrp(const dst_reg
&dst
,
1203 const src_reg
&x
, const src_reg
&y
, const src_reg
&a
)
1205 if (brw
->gen
>= 6) {
1206 /* Note that the instruction's argument order is reversed from GLSL
1210 fix_3src_operand(a
), fix_3src_operand(y
), fix_3src_operand(x
)));
1212 /* Earlier generations don't support three source operations, so we
1213 * need to emit x*(1-a) + y*a.
1215 dst_reg y_times_a
= dst_reg(this, glsl_type::vec4_type
);
1216 dst_reg one_minus_a
= dst_reg(this, glsl_type::vec4_type
);
1217 dst_reg x_times_one_minus_a
= dst_reg(this, glsl_type::vec4_type
);
1218 y_times_a
.writemask
= dst
.writemask
;
1219 one_minus_a
.writemask
= dst
.writemask
;
1220 x_times_one_minus_a
.writemask
= dst
.writemask
;
1222 emit(MUL(y_times_a
, y
, a
));
1223 emit(ADD(one_minus_a
, negate(a
), src_reg(1.0f
)));
1224 emit(MUL(x_times_one_minus_a
, x
, src_reg(one_minus_a
)));
1225 emit(ADD(dst
, src_reg(x_times_one_minus_a
), src_reg(y_times_a
)));
1230 vec4_visitor::visit(ir_expression
*ir
)
1232 unsigned int operand
;
1233 src_reg op
[Elements(ir
->operands
)];
1236 vec4_instruction
*inst
;
1238 if (try_emit_sat(ir
))
1241 if (ir
->operation
== ir_binop_add
) {
1242 if (try_emit_mad(ir
))
1246 if (ir
->operation
== ir_unop_b2f
) {
1247 if (try_emit_b2f_of_compare(ir
))
1251 for (operand
= 0; operand
< ir
->get_num_operands(); operand
++) {
1252 this->result
.file
= BAD_FILE
;
1253 ir
->operands
[operand
]->accept(this);
1254 if (this->result
.file
== BAD_FILE
) {
1255 fprintf(stderr
, "Failed to get tree for expression operand:\n");
1256 ir
->operands
[operand
]->fprint(stderr
);
1259 op
[operand
] = this->result
;
1261 /* Matrix expression operands should have been broken down to vector
1262 * operations already.
1264 assert(!ir
->operands
[operand
]->type
->is_matrix());
1267 int vector_elements
= ir
->operands
[0]->type
->vector_elements
;
1268 if (ir
->operands
[1]) {
1269 vector_elements
= MAX2(vector_elements
,
1270 ir
->operands
[1]->type
->vector_elements
);
1273 this->result
.file
= BAD_FILE
;
1275 /* Storage for our result. Ideally for an assignment we'd be using
1276 * the actual storage for the result here, instead.
1278 result_src
= src_reg(this, ir
->type
);
1279 /* convenience for the emit functions below. */
1280 result_dst
= dst_reg(result_src
);
1281 /* If nothing special happens, this is the result. */
1282 this->result
= result_src
;
1283 /* Limit writes to the channels that will be used by result_src later.
1284 * This does limit this temp's use as a temporary for multi-instruction
1287 result_dst
.writemask
= (1 << ir
->type
->vector_elements
) - 1;
1289 switch (ir
->operation
) {
1290 case ir_unop_logic_not
:
1291 if (ctx
->Const
.UniformBooleanTrue
!= 1) {
1292 emit(NOT(result_dst
, op
[0]));
1294 emit(XOR(result_dst
, op
[0], src_reg(1)));
1298 op
[0].negate
= !op
[0].negate
;
1299 emit(MOV(result_dst
, op
[0]));
1303 op
[0].negate
= false;
1304 emit(MOV(result_dst
, op
[0]));
1308 if (ir
->type
->is_float()) {
1309 /* AND(val, 0x80000000) gives the sign bit.
1311 * Predicated OR ORs 1.0 (0x3f800000) with the sign bit if val is not
1314 emit(CMP(dst_null_f(), op
[0], src_reg(0.0f
), BRW_CONDITIONAL_NZ
));
1316 op
[0].type
= BRW_REGISTER_TYPE_UD
;
1317 result_dst
.type
= BRW_REGISTER_TYPE_UD
;
1318 emit(AND(result_dst
, op
[0], src_reg(0x80000000u
)));
1320 inst
= emit(OR(result_dst
, src_reg(result_dst
), src_reg(0x3f800000u
)));
1321 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1323 this->result
.type
= BRW_REGISTER_TYPE_F
;
1325 /* ASR(val, 31) -> negative val generates 0xffffffff (signed -1).
1326 * -> non-negative val generates 0x00000000.
1327 * Predicated OR sets 1 if val is positive.
1329 emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_G
));
1331 emit(ASR(result_dst
, op
[0], src_reg(31)));
1333 inst
= emit(OR(result_dst
, src_reg(result_dst
), src_reg(1)));
1334 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1339 emit_math(SHADER_OPCODE_RCP
, result_dst
, op
[0]);
1343 emit_math(SHADER_OPCODE_EXP2
, result_dst
, op
[0]);
1346 emit_math(SHADER_OPCODE_LOG2
, result_dst
, op
[0]);
1350 unreachable("not reached: should be handled by ir_explog_to_explog2");
1352 case ir_unop_sin_reduced
:
1353 emit_math(SHADER_OPCODE_SIN
, result_dst
, op
[0]);
1356 case ir_unop_cos_reduced
:
1357 emit_math(SHADER_OPCODE_COS
, result_dst
, op
[0]);
1361 case ir_unop_dFdx_coarse
:
1362 case ir_unop_dFdx_fine
:
1364 case ir_unop_dFdy_coarse
:
1365 case ir_unop_dFdy_fine
:
1366 unreachable("derivatives not valid in vertex shader");
1368 case ir_unop_bitfield_reverse
:
1369 emit(BFREV(result_dst
, op
[0]));
1371 case ir_unop_bit_count
:
1372 emit(CBIT(result_dst
, op
[0]));
1374 case ir_unop_find_msb
: {
1375 src_reg temp
= src_reg(this, glsl_type::uint_type
);
1377 inst
= emit(FBH(dst_reg(temp
), op
[0]));
1378 inst
->dst
.writemask
= WRITEMASK_XYZW
;
1380 /* FBH counts from the MSB side, while GLSL's findMSB() wants the count
1381 * from the LSB side. If FBH didn't return an error (0xFFFFFFFF), then
1382 * subtract the result from 31 to convert the MSB count into an LSB count.
1385 /* FBH only supports UD type for dst, so use a MOV to convert UD to D. */
1386 temp
.swizzle
= BRW_SWIZZLE_NOOP
;
1387 emit(MOV(result_dst
, temp
));
1389 src_reg src_tmp
= src_reg(result_dst
);
1390 emit(CMP(dst_null_d(), src_tmp
, src_reg(-1), BRW_CONDITIONAL_NZ
));
1392 src_tmp
.negate
= true;
1393 inst
= emit(ADD(result_dst
, src_tmp
, src_reg(31)));
1394 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1397 case ir_unop_find_lsb
:
1398 emit(FBL(result_dst
, op
[0]));
1402 unreachable("not reached: should be handled by lower_noise");
1405 emit(ADD(result_dst
, op
[0], op
[1]));
1408 unreachable("not reached: should be handled by ir_sub_to_add_neg");
1411 if (brw
->gen
< 8 && ir
->type
->is_integer()) {
1412 /* For integer multiplication, the MUL uses the low 16 bits of one of
1413 * the operands (src0 through SNB, src1 on IVB and later). The MACH
1414 * accumulates in the contribution of the upper 16 bits of that
1415 * operand. If we can determine that one of the args is in the low
1416 * 16 bits, though, we can just emit a single MUL.
1418 if (ir
->operands
[0]->is_uint16_constant()) {
1420 emit(MUL(result_dst
, op
[0], op
[1]));
1422 emit(MUL(result_dst
, op
[1], op
[0]));
1423 } else if (ir
->operands
[1]->is_uint16_constant()) {
1425 emit(MUL(result_dst
, op
[1], op
[0]));
1427 emit(MUL(result_dst
, op
[0], op
[1]));
1429 struct brw_reg acc
= retype(brw_acc_reg(), result_dst
.type
);
1431 emit(MUL(acc
, op
[0], op
[1]));
1432 emit(MACH(dst_null_d(), op
[0], op
[1]));
1433 emit(MOV(result_dst
, src_reg(acc
)));
1436 emit(MUL(result_dst
, op
[0], op
[1]));
1439 case ir_binop_imul_high
: {
1440 struct brw_reg acc
= retype(brw_acc_reg(), result_dst
.type
);
1442 emit(MUL(acc
, op
[0], op
[1]));
1443 emit(MACH(result_dst
, op
[0], op
[1]));
1447 /* Floating point should be lowered by DIV_TO_MUL_RCP in the compiler. */
1448 assert(ir
->type
->is_integer());
1449 emit_math(SHADER_OPCODE_INT_QUOTIENT
, result_dst
, op
[0], op
[1]);
1451 case ir_binop_carry
: {
1452 struct brw_reg acc
= retype(brw_acc_reg(), BRW_REGISTER_TYPE_UD
);
1454 emit(ADDC(dst_null_ud(), op
[0], op
[1]));
1455 emit(MOV(result_dst
, src_reg(acc
)));
1458 case ir_binop_borrow
: {
1459 struct brw_reg acc
= retype(brw_acc_reg(), BRW_REGISTER_TYPE_UD
);
1461 emit(SUBB(dst_null_ud(), op
[0], op
[1]));
1462 emit(MOV(result_dst
, src_reg(acc
)));
1466 /* Floating point should be lowered by MOD_TO_FRACT in the compiler. */
1467 assert(ir
->type
->is_integer());
1468 emit_math(SHADER_OPCODE_INT_REMAINDER
, result_dst
, op
[0], op
[1]);
1472 case ir_binop_greater
:
1473 case ir_binop_lequal
:
1474 case ir_binop_gequal
:
1475 case ir_binop_equal
:
1476 case ir_binop_nequal
: {
1477 emit(CMP(result_dst
, op
[0], op
[1],
1478 brw_conditional_for_comparison(ir
->operation
)));
1479 if (ctx
->Const
.UniformBooleanTrue
== 1) {
1480 emit(AND(result_dst
, result_src
, src_reg(1)));
1485 case ir_binop_all_equal
:
1486 /* "==" operator producing a scalar boolean. */
1487 if (ir
->operands
[0]->type
->is_vector() ||
1488 ir
->operands
[1]->type
->is_vector()) {
1489 emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_Z
));
1490 emit(MOV(result_dst
, src_reg(0)));
1491 inst
= emit(MOV(result_dst
, src_reg(ctx
->Const
.UniformBooleanTrue
)));
1492 inst
->predicate
= BRW_PREDICATE_ALIGN16_ALL4H
;
1494 emit(CMP(result_dst
, op
[0], op
[1], BRW_CONDITIONAL_Z
));
1495 if (ctx
->Const
.UniformBooleanTrue
== 1) {
1496 emit(AND(result_dst
, result_src
, src_reg(1)));
1500 case ir_binop_any_nequal
:
1501 /* "!=" operator producing a scalar boolean. */
1502 if (ir
->operands
[0]->type
->is_vector() ||
1503 ir
->operands
[1]->type
->is_vector()) {
1504 emit(CMP(dst_null_d(), op
[0], op
[1], BRW_CONDITIONAL_NZ
));
1506 emit(MOV(result_dst
, src_reg(0)));
1507 inst
= emit(MOV(result_dst
, src_reg(ctx
->Const
.UniformBooleanTrue
)));
1508 inst
->predicate
= BRW_PREDICATE_ALIGN16_ANY4H
;
1510 emit(CMP(result_dst
, op
[0], op
[1], BRW_CONDITIONAL_NZ
));
1511 if (ctx
->Const
.UniformBooleanTrue
== 1) {
1512 emit(AND(result_dst
, result_src
, src_reg(1)));
1518 emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
1519 emit(MOV(result_dst
, src_reg(0)));
1521 inst
= emit(MOV(result_dst
, src_reg(ctx
->Const
.UniformBooleanTrue
)));
1522 inst
->predicate
= BRW_PREDICATE_ALIGN16_ANY4H
;
1525 case ir_binop_logic_xor
:
1526 emit(XOR(result_dst
, op
[0], op
[1]));
1529 case ir_binop_logic_or
:
1530 emit(OR(result_dst
, op
[0], op
[1]));
1533 case ir_binop_logic_and
:
1534 emit(AND(result_dst
, op
[0], op
[1]));
1538 assert(ir
->operands
[0]->type
->is_vector());
1539 assert(ir
->operands
[0]->type
== ir
->operands
[1]->type
);
1540 emit_dp(result_dst
, op
[0], op
[1], ir
->operands
[0]->type
->vector_elements
);
1544 emit_math(SHADER_OPCODE_SQRT
, result_dst
, op
[0]);
1547 emit_math(SHADER_OPCODE_RSQ
, result_dst
, op
[0]);
1550 case ir_unop_bitcast_i2f
:
1551 case ir_unop_bitcast_u2f
:
1552 this->result
= op
[0];
1553 this->result
.type
= BRW_REGISTER_TYPE_F
;
1556 case ir_unop_bitcast_f2i
:
1557 this->result
= op
[0];
1558 this->result
.type
= BRW_REGISTER_TYPE_D
;
1561 case ir_unop_bitcast_f2u
:
1562 this->result
= op
[0];
1563 this->result
.type
= BRW_REGISTER_TYPE_UD
;
1572 emit(MOV(result_dst
, op
[0]));
1575 if (ctx
->Const
.UniformBooleanTrue
!= 1) {
1576 emit(AND(result_dst
, op
[0], src_reg(1)));
1578 emit(MOV(result_dst
, op
[0]));
1582 if (ctx
->Const
.UniformBooleanTrue
!= 1) {
1583 op
[0].type
= BRW_REGISTER_TYPE_UD
;
1584 result_dst
.type
= BRW_REGISTER_TYPE_UD
;
1585 emit(AND(result_dst
, op
[0], src_reg(0x3f800000u
)));
1586 result_dst
.type
= BRW_REGISTER_TYPE_F
;
1588 emit(MOV(result_dst
, op
[0]));
1593 emit(CMP(result_dst
, op
[0], src_reg(0.0f
), BRW_CONDITIONAL_NZ
));
1594 if (ctx
->Const
.UniformBooleanTrue
== 1) {
1595 emit(AND(result_dst
, result_src
, src_reg(1)));
1600 emit(RNDZ(result_dst
, op
[0]));
1603 op
[0].negate
= !op
[0].negate
;
1604 inst
= emit(RNDD(result_dst
, op
[0]));
1605 this->result
.negate
= true;
1608 inst
= emit(RNDD(result_dst
, op
[0]));
1611 inst
= emit(FRC(result_dst
, op
[0]));
1613 case ir_unop_round_even
:
1614 emit(RNDE(result_dst
, op
[0]));
1618 emit_minmax(BRW_CONDITIONAL_L
, result_dst
, op
[0], op
[1]);
1621 emit_minmax(BRW_CONDITIONAL_G
, result_dst
, op
[0], op
[1]);
1625 emit_math(SHADER_OPCODE_POW
, result_dst
, op
[0], op
[1]);
1628 case ir_unop_bit_not
:
1629 inst
= emit(NOT(result_dst
, op
[0]));
1631 case ir_binop_bit_and
:
1632 inst
= emit(AND(result_dst
, op
[0], op
[1]));
1634 case ir_binop_bit_xor
:
1635 inst
= emit(XOR(result_dst
, op
[0], op
[1]));
1637 case ir_binop_bit_or
:
1638 inst
= emit(OR(result_dst
, op
[0], op
[1]));
1641 case ir_binop_lshift
:
1642 inst
= emit(SHL(result_dst
, op
[0], op
[1]));
1645 case ir_binop_rshift
:
1646 if (ir
->type
->base_type
== GLSL_TYPE_INT
)
1647 inst
= emit(ASR(result_dst
, op
[0], op
[1]));
1649 inst
= emit(SHR(result_dst
, op
[0], op
[1]));
1653 emit(BFI1(result_dst
, op
[0], op
[1]));
1656 case ir_binop_ubo_load
: {
1657 ir_constant
*const_uniform_block
= ir
->operands
[0]->as_constant();
1658 ir_constant
*const_offset_ir
= ir
->operands
[1]->as_constant();
1659 unsigned const_offset
= const_offset_ir
? const_offset_ir
->value
.u
[0] : 0;
1662 /* Now, load the vector from that offset. */
1663 assert(ir
->type
->is_vector() || ir
->type
->is_scalar());
1665 src_reg packed_consts
= src_reg(this, glsl_type::vec4_type
);
1666 packed_consts
.type
= result
.type
;
1669 if (const_uniform_block
) {
1670 /* The block index is a constant, so just emit the binding table entry
1673 surf_index
= src_reg(prog_data
->base
.binding_table
.ubo_start
+
1674 const_uniform_block
->value
.u
[0]);
1676 /* The block index is not a constant. Evaluate the index expression
1677 * per-channel and add the base UBO index; the generator will select
1678 * a value from any live channel.
1680 surf_index
= src_reg(this, glsl_type::uint_type
);
1681 emit(ADD(dst_reg(surf_index
), op
[0],
1682 src_reg(prog_data
->base
.binding_table
.ubo_start
)));
1684 /* Assume this may touch any UBO. It would be nice to provide
1685 * a tighter bound, but the array information is already lowered away.
1687 brw_mark_surface_used(&prog_data
->base
,
1688 prog_data
->base
.binding_table
.ubo_start
+
1689 shader_prog
->NumUniformBlocks
- 1);
1692 if (const_offset_ir
) {
1693 if (brw
->gen
>= 8) {
1694 /* Store the offset in a GRF so we can send-from-GRF. */
1695 offset
= src_reg(this, glsl_type::int_type
);
1696 emit(MOV(dst_reg(offset
), src_reg(const_offset
/ 16)));
1698 /* Immediates are fine on older generations since they'll be moved
1699 * to a (potentially fake) MRF at the generator level.
1701 offset
= src_reg(const_offset
/ 16);
1704 offset
= src_reg(this, glsl_type::uint_type
);
1705 emit(SHR(dst_reg(offset
), op
[1], src_reg(4)));
1708 if (brw
->gen
>= 7) {
1709 dst_reg grf_offset
= dst_reg(this, glsl_type::int_type
);
1710 grf_offset
.type
= offset
.type
;
1712 emit(MOV(grf_offset
, offset
));
1714 emit(new(mem_ctx
) vec4_instruction(this,
1715 VS_OPCODE_PULL_CONSTANT_LOAD_GEN7
,
1716 dst_reg(packed_consts
),
1718 src_reg(grf_offset
)));
1720 vec4_instruction
*pull
=
1721 emit(new(mem_ctx
) vec4_instruction(this,
1722 VS_OPCODE_PULL_CONSTANT_LOAD
,
1723 dst_reg(packed_consts
),
1726 pull
->base_mrf
= 14;
1730 packed_consts
.swizzle
= swizzle_for_size(ir
->type
->vector_elements
);
1731 packed_consts
.swizzle
+= BRW_SWIZZLE4(const_offset
% 16 / 4,
1732 const_offset
% 16 / 4,
1733 const_offset
% 16 / 4,
1734 const_offset
% 16 / 4);
1736 /* UBO bools are any nonzero int. We need to convert them to use the
1737 * value of true stored in ctx->Const.UniformBooleanTrue.
1739 if (ir
->type
->base_type
== GLSL_TYPE_BOOL
) {
1740 emit(CMP(result_dst
, packed_consts
, src_reg(0u),
1741 BRW_CONDITIONAL_NZ
));
1742 if (ctx
->Const
.UniformBooleanTrue
== 1) {
1743 emit(AND(result_dst
, result
, src_reg(1)));
1746 emit(MOV(result_dst
, packed_consts
));
1751 case ir_binop_vector_extract
:
1752 unreachable("should have been lowered by vec_index_to_cond_assign");
1755 op
[0] = fix_3src_operand(op
[0]);
1756 op
[1] = fix_3src_operand(op
[1]);
1757 op
[2] = fix_3src_operand(op
[2]);
1758 /* Note that the instruction's argument order is reversed from GLSL
1761 emit(MAD(result_dst
, op
[2], op
[1], op
[0]));
1765 emit_lrp(result_dst
, op
[0], op
[1], op
[2]);
1769 emit(CMP(dst_null_d(), op
[0], src_reg(0), BRW_CONDITIONAL_NZ
));
1770 inst
= emit(BRW_OPCODE_SEL
, result_dst
, op
[1], op
[2]);
1771 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1775 op
[0] = fix_3src_operand(op
[0]);
1776 op
[1] = fix_3src_operand(op
[1]);
1777 op
[2] = fix_3src_operand(op
[2]);
1778 emit(BFI2(result_dst
, op
[0], op
[1], op
[2]));
1781 case ir_triop_bitfield_extract
:
1782 op
[0] = fix_3src_operand(op
[0]);
1783 op
[1] = fix_3src_operand(op
[1]);
1784 op
[2] = fix_3src_operand(op
[2]);
1785 /* Note that the instruction's argument order is reversed from GLSL
1788 emit(BFE(result_dst
, op
[2], op
[1], op
[0]));
1791 case ir_triop_vector_insert
:
1792 unreachable("should have been lowered by lower_vector_insert");
1794 case ir_quadop_bitfield_insert
:
1795 unreachable("not reached: should be handled by "
1796 "bitfield_insert_to_bfm_bfi\n");
1798 case ir_quadop_vector
:
1799 unreachable("not reached: should be handled by lower_quadop_vector");
1801 case ir_unop_pack_half_2x16
:
1802 emit_pack_half_2x16(result_dst
, op
[0]);
1804 case ir_unop_unpack_half_2x16
:
1805 emit_unpack_half_2x16(result_dst
, op
[0]);
1807 case ir_unop_pack_snorm_2x16
:
1808 case ir_unop_pack_snorm_4x8
:
1809 case ir_unop_pack_unorm_2x16
:
1810 case ir_unop_pack_unorm_4x8
:
1811 case ir_unop_unpack_snorm_2x16
:
1812 case ir_unop_unpack_snorm_4x8
:
1813 case ir_unop_unpack_unorm_2x16
:
1814 case ir_unop_unpack_unorm_4x8
:
1815 unreachable("not reached: should be handled by lower_packing_builtins");
1816 case ir_unop_unpack_half_2x16_split_x
:
1817 case ir_unop_unpack_half_2x16_split_y
:
1818 case ir_binop_pack_half_2x16_split
:
1819 case ir_unop_interpolate_at_centroid
:
1820 case ir_binop_interpolate_at_sample
:
1821 case ir_binop_interpolate_at_offset
:
1822 unreachable("not reached: should not occur in vertex shader");
1823 case ir_binop_ldexp
:
1824 unreachable("not reached: should be handled by ldexp_to_arith()");
1830 vec4_visitor::visit(ir_swizzle
*ir
)
1836 /* Note that this is only swizzles in expressions, not those on the left
1837 * hand side of an assignment, which do write masking. See ir_assignment
1841 ir
->val
->accept(this);
1843 assert(src
.file
!= BAD_FILE
);
1845 for (i
= 0; i
< ir
->type
->vector_elements
; i
++) {
1848 swizzle
[i
] = BRW_GET_SWZ(src
.swizzle
, ir
->mask
.x
);
1851 swizzle
[i
] = BRW_GET_SWZ(src
.swizzle
, ir
->mask
.y
);
1854 swizzle
[i
] = BRW_GET_SWZ(src
.swizzle
, ir
->mask
.z
);
1857 swizzle
[i
] = BRW_GET_SWZ(src
.swizzle
, ir
->mask
.w
);
1861 for (; i
< 4; i
++) {
1862 /* Replicate the last channel out. */
1863 swizzle
[i
] = swizzle
[ir
->type
->vector_elements
- 1];
1866 src
.swizzle
= BRW_SWIZZLE4(swizzle
[0], swizzle
[1], swizzle
[2], swizzle
[3]);
1872 vec4_visitor::visit(ir_dereference_variable
*ir
)
1874 const struct glsl_type
*type
= ir
->type
;
1875 dst_reg
*reg
= variable_storage(ir
->var
);
1878 fail("Failed to find variable storage for %s\n", ir
->var
->name
);
1879 this->result
= src_reg(brw_null_reg());
1883 this->result
= src_reg(*reg
);
1885 /* System values get their swizzle from the dst_reg writemask */
1886 if (ir
->var
->data
.mode
== ir_var_system_value
)
1889 if (type
->is_scalar() || type
->is_vector() || type
->is_matrix())
1890 this->result
.swizzle
= swizzle_for_size(type
->vector_elements
);
1895 vec4_visitor::compute_array_stride(ir_dereference_array
*ir
)
1897 /* Under normal circumstances array elements are stored consecutively, so
1898 * the stride is equal to the size of the array element.
1900 return type_size(ir
->type
);
1905 vec4_visitor::visit(ir_dereference_array
*ir
)
1907 ir_constant
*constant_index
;
1909 int array_stride
= compute_array_stride(ir
);
1911 constant_index
= ir
->array_index
->constant_expression_value();
1913 ir
->array
->accept(this);
1916 if (constant_index
) {
1917 src
.reg_offset
+= constant_index
->value
.i
[0] * array_stride
;
1919 /* Variable index array dereference. It eats the "vec4" of the
1920 * base of the array and an index that offsets the Mesa register
1923 ir
->array_index
->accept(this);
1927 if (array_stride
== 1) {
1928 index_reg
= this->result
;
1930 index_reg
= src_reg(this, glsl_type::int_type
);
1932 emit(MUL(dst_reg(index_reg
), this->result
, src_reg(array_stride
)));
1936 src_reg temp
= src_reg(this, glsl_type::int_type
);
1938 emit(ADD(dst_reg(temp
), *src
.reladdr
, index_reg
));
1943 src
.reladdr
= ralloc(mem_ctx
, src_reg
);
1944 memcpy(src
.reladdr
, &index_reg
, sizeof(index_reg
));
1947 /* If the type is smaller than a vec4, replicate the last channel out. */
1948 if (ir
->type
->is_scalar() || ir
->type
->is_vector() || ir
->type
->is_matrix())
1949 src
.swizzle
= swizzle_for_size(ir
->type
->vector_elements
);
1951 src
.swizzle
= BRW_SWIZZLE_NOOP
;
1952 src
.type
= brw_type_for_base_type(ir
->type
);
1958 vec4_visitor::visit(ir_dereference_record
*ir
)
1961 const glsl_type
*struct_type
= ir
->record
->type
;
1964 ir
->record
->accept(this);
1966 for (i
= 0; i
< struct_type
->length
; i
++) {
1967 if (strcmp(struct_type
->fields
.structure
[i
].name
, ir
->field
) == 0)
1969 offset
+= type_size(struct_type
->fields
.structure
[i
].type
);
1972 /* If the type is smaller than a vec4, replicate the last channel out. */
1973 if (ir
->type
->is_scalar() || ir
->type
->is_vector() || ir
->type
->is_matrix())
1974 this->result
.swizzle
= swizzle_for_size(ir
->type
->vector_elements
);
1976 this->result
.swizzle
= BRW_SWIZZLE_NOOP
;
1977 this->result
.type
= brw_type_for_base_type(ir
->type
);
1979 this->result
.reg_offset
+= offset
;
1983 * We want to be careful in assignment setup to hit the actual storage
1984 * instead of potentially using a temporary like we might with the
1985 * ir_dereference handler.
1988 get_assignment_lhs(ir_dereference
*ir
, vec4_visitor
*v
)
1990 /* The LHS must be a dereference. If the LHS is a variable indexed array
1991 * access of a vector, it must be separated into a series conditional moves
1992 * before reaching this point (see ir_vec_index_to_cond_assign).
1994 assert(ir
->as_dereference());
1995 ir_dereference_array
*deref_array
= ir
->as_dereference_array();
1997 assert(!deref_array
->array
->type
->is_vector());
2000 /* Use the rvalue deref handler for the most part. We'll ignore
2001 * swizzles in it and write swizzles using writemask, though.
2004 return dst_reg(v
->result
);
2008 vec4_visitor::emit_block_move(dst_reg
*dst
, src_reg
*src
,
2009 const struct glsl_type
*type
,
2010 enum brw_predicate predicate
)
2012 if (type
->base_type
== GLSL_TYPE_STRUCT
) {
2013 for (unsigned int i
= 0; i
< type
->length
; i
++) {
2014 emit_block_move(dst
, src
, type
->fields
.structure
[i
].type
, predicate
);
2019 if (type
->is_array()) {
2020 for (unsigned int i
= 0; i
< type
->length
; i
++) {
2021 emit_block_move(dst
, src
, type
->fields
.array
, predicate
);
2026 if (type
->is_matrix()) {
2027 const struct glsl_type
*vec_type
;
2029 vec_type
= glsl_type::get_instance(GLSL_TYPE_FLOAT
,
2030 type
->vector_elements
, 1);
2032 for (int i
= 0; i
< type
->matrix_columns
; i
++) {
2033 emit_block_move(dst
, src
, vec_type
, predicate
);
2038 assert(type
->is_scalar() || type
->is_vector());
2040 dst
->type
= brw_type_for_base_type(type
);
2041 src
->type
= dst
->type
;
2043 dst
->writemask
= (1 << type
->vector_elements
) - 1;
2045 src
->swizzle
= swizzle_for_size(type
->vector_elements
);
2047 vec4_instruction
*inst
= emit(MOV(*dst
, *src
));
2048 inst
->predicate
= predicate
;
2055 /* If the RHS processing resulted in an instruction generating a
2056 * temporary value, and it would be easy to rewrite the instruction to
2057 * generate its result right into the LHS instead, do so. This ends
2058 * up reliably removing instructions where it can be tricky to do so
2059 * later without real UD chain information.
2062 vec4_visitor::try_rewrite_rhs_to_dst(ir_assignment
*ir
,
2065 vec4_instruction
*pre_rhs_inst
,
2066 vec4_instruction
*last_rhs_inst
)
2068 /* This could be supported, but it would take more smarts. */
2072 if (pre_rhs_inst
== last_rhs_inst
)
2073 return false; /* No instructions generated to work with. */
2075 /* Make sure the last instruction generated our source reg. */
2076 if (src
.file
!= GRF
||
2077 src
.file
!= last_rhs_inst
->dst
.file
||
2078 src
.reg
!= last_rhs_inst
->dst
.reg
||
2079 src
.reg_offset
!= last_rhs_inst
->dst
.reg_offset
||
2083 last_rhs_inst
->predicate
!= BRW_PREDICATE_NONE
)
2086 /* Check that that last instruction fully initialized the channels
2087 * we want to use, in the order we want to use them. We could
2088 * potentially reswizzle the operands of many instructions so that
2089 * we could handle out of order channels, but don't yet.
2092 for (unsigned i
= 0; i
< 4; i
++) {
2093 if (dst
.writemask
& (1 << i
)) {
2094 if (!(last_rhs_inst
->dst
.writemask
& (1 << i
)))
2097 if (BRW_GET_SWZ(src
.swizzle
, i
) != i
)
2102 /* Success! Rewrite the instruction. */
2103 last_rhs_inst
->dst
.file
= dst
.file
;
2104 last_rhs_inst
->dst
.reg
= dst
.reg
;
2105 last_rhs_inst
->dst
.reg_offset
= dst
.reg_offset
;
2106 last_rhs_inst
->dst
.reladdr
= dst
.reladdr
;
2107 last_rhs_inst
->dst
.writemask
&= dst
.writemask
;
2113 vec4_visitor::visit(ir_assignment
*ir
)
2115 dst_reg dst
= get_assignment_lhs(ir
->lhs
, this);
2116 enum brw_predicate predicate
= BRW_PREDICATE_NONE
;
2118 if (!ir
->lhs
->type
->is_scalar() &&
2119 !ir
->lhs
->type
->is_vector()) {
2120 ir
->rhs
->accept(this);
2121 src_reg src
= this->result
;
2123 if (ir
->condition
) {
2124 emit_bool_to_cond_code(ir
->condition
, &predicate
);
2127 /* emit_block_move doesn't account for swizzles in the source register.
2128 * This should be ok, since the source register is a structure or an
2129 * array, and those can't be swizzled. But double-check to be sure.
2131 assert(src
.swizzle
==
2132 (ir
->rhs
->type
->is_matrix()
2133 ? swizzle_for_size(ir
->rhs
->type
->vector_elements
)
2134 : BRW_SWIZZLE_NOOP
));
2136 emit_block_move(&dst
, &src
, ir
->rhs
->type
, predicate
);
2140 /* Now we're down to just a scalar/vector with writemasks. */
2143 vec4_instruction
*pre_rhs_inst
, *last_rhs_inst
;
2144 pre_rhs_inst
= (vec4_instruction
*)this->instructions
.get_tail();
2146 ir
->rhs
->accept(this);
2148 last_rhs_inst
= (vec4_instruction
*)this->instructions
.get_tail();
2150 src_reg src
= this->result
;
2153 int first_enabled_chan
= 0;
2156 assert(ir
->lhs
->type
->is_vector() ||
2157 ir
->lhs
->type
->is_scalar());
2158 dst
.writemask
= ir
->write_mask
;
2160 for (int i
= 0; i
< 4; i
++) {
2161 if (dst
.writemask
& (1 << i
)) {
2162 first_enabled_chan
= BRW_GET_SWZ(src
.swizzle
, i
);
2167 /* Swizzle a small RHS vector into the channels being written.
2169 * glsl ir treats write_mask as dictating how many channels are
2170 * present on the RHS while in our instructions we need to make
2171 * those channels appear in the slots of the vec4 they're written to.
2173 for (int i
= 0; i
< 4; i
++) {
2174 if (dst
.writemask
& (1 << i
))
2175 swizzles
[i
] = BRW_GET_SWZ(src
.swizzle
, src_chan
++);
2177 swizzles
[i
] = first_enabled_chan
;
2179 src
.swizzle
= BRW_SWIZZLE4(swizzles
[0], swizzles
[1],
2180 swizzles
[2], swizzles
[3]);
2182 if (try_rewrite_rhs_to_dst(ir
, dst
, src
, pre_rhs_inst
, last_rhs_inst
)) {
2186 if (ir
->condition
) {
2187 emit_bool_to_cond_code(ir
->condition
, &predicate
);
2190 for (i
= 0; i
< type_size(ir
->lhs
->type
); i
++) {
2191 vec4_instruction
*inst
= emit(MOV(dst
, src
));
2192 inst
->predicate
= predicate
;
2200 vec4_visitor::emit_constant_values(dst_reg
*dst
, ir_constant
*ir
)
2202 if (ir
->type
->base_type
== GLSL_TYPE_STRUCT
) {
2203 foreach_in_list(ir_constant
, field_value
, &ir
->components
) {
2204 emit_constant_values(dst
, field_value
);
2209 if (ir
->type
->is_array()) {
2210 for (unsigned int i
= 0; i
< ir
->type
->length
; i
++) {
2211 emit_constant_values(dst
, ir
->array_elements
[i
]);
2216 if (ir
->type
->is_matrix()) {
2217 for (int i
= 0; i
< ir
->type
->matrix_columns
; i
++) {
2218 float *vec
= &ir
->value
.f
[i
* ir
->type
->vector_elements
];
2220 for (int j
= 0; j
< ir
->type
->vector_elements
; j
++) {
2221 dst
->writemask
= 1 << j
;
2222 dst
->type
= BRW_REGISTER_TYPE_F
;
2224 emit(MOV(*dst
, src_reg(vec
[j
])));
2231 int remaining_writemask
= (1 << ir
->type
->vector_elements
) - 1;
2233 for (int i
= 0; i
< ir
->type
->vector_elements
; i
++) {
2234 if (!(remaining_writemask
& (1 << i
)))
2237 dst
->writemask
= 1 << i
;
2238 dst
->type
= brw_type_for_base_type(ir
->type
);
2240 /* Find other components that match the one we're about to
2241 * write. Emits fewer instructions for things like vec4(0.5,
2244 for (int j
= i
+ 1; j
< ir
->type
->vector_elements
; j
++) {
2245 if (ir
->type
->base_type
== GLSL_TYPE_BOOL
) {
2246 if (ir
->value
.b
[i
] == ir
->value
.b
[j
])
2247 dst
->writemask
|= (1 << j
);
2249 /* u, i, and f storage all line up, so no need for a
2250 * switch case for comparing each type.
2252 if (ir
->value
.u
[i
] == ir
->value
.u
[j
])
2253 dst
->writemask
|= (1 << j
);
2257 switch (ir
->type
->base_type
) {
2258 case GLSL_TYPE_FLOAT
:
2259 emit(MOV(*dst
, src_reg(ir
->value
.f
[i
])));
2262 emit(MOV(*dst
, src_reg(ir
->value
.i
[i
])));
2264 case GLSL_TYPE_UINT
:
2265 emit(MOV(*dst
, src_reg(ir
->value
.u
[i
])));
2267 case GLSL_TYPE_BOOL
:
2269 src_reg(ir
->value
.b
[i
] != 0 ? ctx
->Const
.UniformBooleanTrue
2273 unreachable("Non-float/uint/int/bool constant");
2276 remaining_writemask
&= ~dst
->writemask
;
2282 vec4_visitor::visit(ir_constant
*ir
)
2284 dst_reg dst
= dst_reg(this, ir
->type
);
2285 this->result
= src_reg(dst
);
2287 emit_constant_values(&dst
, ir
);
2291 vec4_visitor::visit_atomic_counter_intrinsic(ir_call
*ir
)
2293 ir_dereference
*deref
= static_cast<ir_dereference
*>(
2294 ir
->actual_parameters
.get_head());
2295 ir_variable
*location
= deref
->variable_referenced();
2296 unsigned surf_index
= (prog_data
->base
.binding_table
.abo_start
+
2297 location
->data
.atomic
.buffer_index
);
2299 /* Calculate the surface offset */
2300 src_reg
offset(this, glsl_type::uint_type
);
2301 ir_dereference_array
*deref_array
= deref
->as_dereference_array();
2303 deref_array
->array_index
->accept(this);
2305 src_reg
tmp(this, glsl_type::uint_type
);
2306 emit(MUL(dst_reg(tmp
), this->result
, ATOMIC_COUNTER_SIZE
));
2307 emit(ADD(dst_reg(offset
), tmp
, location
->data
.atomic
.offset
));
2309 offset
= location
->data
.atomic
.offset
;
2312 /* Emit the appropriate machine instruction */
2313 const char *callee
= ir
->callee
->function_name();
2314 dst_reg dst
= get_assignment_lhs(ir
->return_deref
, this);
2316 if (!strcmp("__intrinsic_atomic_read", callee
)) {
2317 emit_untyped_surface_read(surf_index
, dst
, offset
);
2319 } else if (!strcmp("__intrinsic_atomic_increment", callee
)) {
2320 emit_untyped_atomic(BRW_AOP_INC
, surf_index
, dst
, offset
,
2321 src_reg(), src_reg());
2323 } else if (!strcmp("__intrinsic_atomic_predecrement", callee
)) {
2324 emit_untyped_atomic(BRW_AOP_PREDEC
, surf_index
, dst
, offset
,
2325 src_reg(), src_reg());
2330 vec4_visitor::visit(ir_call
*ir
)
2332 const char *callee
= ir
->callee
->function_name();
2334 if (!strcmp("__intrinsic_atomic_read", callee
) ||
2335 !strcmp("__intrinsic_atomic_increment", callee
) ||
2336 !strcmp("__intrinsic_atomic_predecrement", callee
)) {
2337 visit_atomic_counter_intrinsic(ir
);
2339 unreachable("Unsupported intrinsic.");
2344 vec4_visitor::emit_mcs_fetch(ir_texture
*ir
, src_reg coordinate
, src_reg sampler
)
2346 vec4_instruction
*inst
= new(mem_ctx
) vec4_instruction(this, SHADER_OPCODE_TXF_MCS
);
2349 inst
->dst
= dst_reg(this, glsl_type::uvec4_type
);
2350 inst
->dst
.writemask
= WRITEMASK_XYZW
;
2352 inst
->src
[1] = sampler
;
2354 /* parameters are: u, v, r, lod; lod will always be zero due to api restrictions */
2355 int param_base
= inst
->base_mrf
;
2356 int coord_mask
= (1 << ir
->coordinate
->type
->vector_elements
) - 1;
2357 int zero_mask
= 0xf & ~coord_mask
;
2359 emit(MOV(dst_reg(MRF
, param_base
, ir
->coordinate
->type
, coord_mask
),
2362 emit(MOV(dst_reg(MRF
, param_base
, ir
->coordinate
->type
, zero_mask
),
2366 return src_reg(inst
->dst
);
2370 is_high_sampler(struct brw_context
*brw
, src_reg sampler
)
2372 if (brw
->gen
< 8 && !brw
->is_haswell
)
2375 return sampler
.file
!= IMM
|| sampler
.fixed_hw_reg
.dw1
.ud
>= 16;
2379 vec4_visitor::visit(ir_texture
*ir
)
2382 _mesa_get_sampler_uniform_value(ir
->sampler
, shader_prog
, prog
);
2384 ir_rvalue
*nonconst_sampler_index
=
2385 _mesa_get_sampler_array_nonconst_index(ir
->sampler
);
2387 /* Handle non-constant sampler array indexing */
2388 src_reg sampler_reg
;
2389 if (nonconst_sampler_index
) {
2390 /* The highest sampler which may be used by this operation is
2391 * the last element of the array. Mark it here, because the generator
2392 * doesn't have enough information to determine the bound.
2394 uint32_t array_size
= ir
->sampler
->as_dereference_array()
2395 ->array
->type
->array_size();
2397 uint32_t max_used
= sampler
+ array_size
- 1;
2398 if (ir
->op
== ir_tg4
&& brw
->gen
< 8) {
2399 max_used
+= prog_data
->base
.binding_table
.gather_texture_start
;
2401 max_used
+= prog_data
->base
.binding_table
.texture_start
;
2404 brw_mark_surface_used(&prog_data
->base
, max_used
);
2406 /* Emit code to evaluate the actual indexing expression */
2407 nonconst_sampler_index
->accept(this);
2408 dst_reg
temp(this, glsl_type::uint_type
);
2409 emit(ADD(temp
, this->result
, src_reg(sampler
)))
2410 ->force_writemask_all
= true;
2411 sampler_reg
= src_reg(temp
);
2413 /* Single sampler, or constant array index; the indexing expression
2414 * is just an immediate.
2416 sampler_reg
= src_reg(sampler
);
2419 /* When tg4 is used with the degenerate ZERO/ONE swizzles, don't bother
2420 * emitting anything other than setting up the constant result.
2422 if (ir
->op
== ir_tg4
) {
2423 ir_constant
*chan
= ir
->lod_info
.component
->as_constant();
2424 int swiz
= GET_SWZ(key
->tex
.swizzles
[sampler
], chan
->value
.i
[0]);
2425 if (swiz
== SWIZZLE_ZERO
|| swiz
== SWIZZLE_ONE
) {
2426 dst_reg
result(this, ir
->type
);
2427 this->result
= src_reg(result
);
2428 emit(MOV(result
, src_reg(swiz
== SWIZZLE_ONE
? 1.0f
: 0.0f
)));
2433 /* Should be lowered by do_lower_texture_projection */
2434 assert(!ir
->projector
);
2436 /* Should be lowered */
2437 assert(!ir
->offset
|| !ir
->offset
->type
->is_array());
2439 /* Generate code to compute all the subexpression trees. This has to be
2440 * done before loading any values into MRFs for the sampler message since
2441 * generating these values may involve SEND messages that need the MRFs.
2444 if (ir
->coordinate
) {
2445 ir
->coordinate
->accept(this);
2446 coordinate
= this->result
;
2449 src_reg shadow_comparitor
;
2450 if (ir
->shadow_comparitor
) {
2451 ir
->shadow_comparitor
->accept(this);
2452 shadow_comparitor
= this->result
;
2455 bool has_nonconstant_offset
= ir
->offset
&& !ir
->offset
->as_constant();
2456 src_reg offset_value
;
2457 if (has_nonconstant_offset
) {
2458 ir
->offset
->accept(this);
2459 offset_value
= src_reg(this->result
);
2462 const glsl_type
*lod_type
= NULL
, *sample_index_type
= NULL
;
2463 src_reg lod
, dPdx
, dPdy
, sample_index
, mcs
;
2466 lod
= src_reg(0.0f
);
2467 lod_type
= glsl_type::float_type
;
2472 ir
->lod_info
.lod
->accept(this);
2474 lod_type
= ir
->lod_info
.lod
->type
;
2476 case ir_query_levels
:
2478 lod_type
= glsl_type::int_type
;
2481 ir
->lod_info
.sample_index
->accept(this);
2482 sample_index
= this->result
;
2483 sample_index_type
= ir
->lod_info
.sample_index
->type
;
2485 if (brw
->gen
>= 7 && key
->tex
.compressed_multisample_layout_mask
& (1<<sampler
))
2486 mcs
= emit_mcs_fetch(ir
, coordinate
, sampler_reg
);
2491 ir
->lod_info
.grad
.dPdx
->accept(this);
2492 dPdx
= this->result
;
2494 ir
->lod_info
.grad
.dPdy
->accept(this);
2495 dPdy
= this->result
;
2497 lod_type
= ir
->lod_info
.grad
.dPdx
->type
;
2507 case ir_tex
: opcode
= SHADER_OPCODE_TXL
; break;
2508 case ir_txl
: opcode
= SHADER_OPCODE_TXL
; break;
2509 case ir_txd
: opcode
= SHADER_OPCODE_TXD
; break;
2510 case ir_txf
: opcode
= SHADER_OPCODE_TXF
; break;
2511 case ir_txf_ms
: opcode
= SHADER_OPCODE_TXF_CMS
; break;
2512 case ir_txs
: opcode
= SHADER_OPCODE_TXS
; break;
2513 case ir_tg4
: opcode
= has_nonconstant_offset
2514 ? SHADER_OPCODE_TG4_OFFSET
: SHADER_OPCODE_TG4
; break;
2515 case ir_query_levels
: opcode
= SHADER_OPCODE_TXS
; break;
2517 unreachable("TXB is not valid for vertex shaders.");
2519 unreachable("LOD is not valid for vertex shaders.");
2521 unreachable("Unrecognized tex op");
2524 vec4_instruction
*inst
= new(mem_ctx
) vec4_instruction(this, opcode
);
2526 if (ir
->offset
!= NULL
&& ir
->op
!= ir_txf
)
2527 inst
->texture_offset
= brw_texture_offset(ctx
, ir
->offset
->as_constant());
2529 /* Stuff the channel select bits in the top of the texture offset */
2530 if (ir
->op
== ir_tg4
)
2531 inst
->texture_offset
|= gather_channel(ir
, sampler
) << 16;
2533 /* The message header is necessary for:
2536 * - Gather channel selection
2537 * - Sampler indices too large to fit in a 4-bit value.
2539 inst
->header_present
=
2540 brw
->gen
< 5 || inst
->texture_offset
!= 0 || ir
->op
== ir_tg4
||
2541 is_high_sampler(brw
, sampler_reg
);
2543 inst
->mlen
= inst
->header_present
+ 1; /* always at least one */
2544 inst
->dst
= dst_reg(this, ir
->type
);
2545 inst
->dst
.writemask
= WRITEMASK_XYZW
;
2546 inst
->shadow_compare
= ir
->shadow_comparitor
!= NULL
;
2548 inst
->src
[1] = sampler_reg
;
2550 /* MRF for the first parameter */
2551 int param_base
= inst
->base_mrf
+ inst
->header_present
;
2553 if (ir
->op
== ir_txs
|| ir
->op
== ir_query_levels
) {
2554 int writemask
= brw
->gen
== 4 ? WRITEMASK_W
: WRITEMASK_X
;
2555 emit(MOV(dst_reg(MRF
, param_base
, lod_type
, writemask
), lod
));
2557 /* Load the coordinate */
2558 /* FINISHME: gl_clamp_mask and saturate */
2559 int coord_mask
= (1 << ir
->coordinate
->type
->vector_elements
) - 1;
2560 int zero_mask
= 0xf & ~coord_mask
;
2562 emit(MOV(dst_reg(MRF
, param_base
, ir
->coordinate
->type
, coord_mask
),
2565 if (zero_mask
!= 0) {
2566 emit(MOV(dst_reg(MRF
, param_base
, ir
->coordinate
->type
, zero_mask
),
2569 /* Load the shadow comparitor */
2570 if (ir
->shadow_comparitor
&& ir
->op
!= ir_txd
&& (ir
->op
!= ir_tg4
|| !has_nonconstant_offset
)) {
2571 emit(MOV(dst_reg(MRF
, param_base
+ 1, ir
->shadow_comparitor
->type
,
2573 shadow_comparitor
));
2577 /* Load the LOD info */
2578 if (ir
->op
== ir_tex
|| ir
->op
== ir_txl
) {
2580 if (brw
->gen
>= 5) {
2581 mrf
= param_base
+ 1;
2582 if (ir
->shadow_comparitor
) {
2583 writemask
= WRITEMASK_Y
;
2584 /* mlen already incremented */
2586 writemask
= WRITEMASK_X
;
2589 } else /* brw->gen == 4 */ {
2591 writemask
= WRITEMASK_W
;
2593 emit(MOV(dst_reg(MRF
, mrf
, lod_type
, writemask
), lod
));
2594 } else if (ir
->op
== ir_txf
) {
2595 emit(MOV(dst_reg(MRF
, param_base
, lod_type
, WRITEMASK_W
), lod
));
2596 } else if (ir
->op
== ir_txf_ms
) {
2597 emit(MOV(dst_reg(MRF
, param_base
+ 1, sample_index_type
, WRITEMASK_X
),
2600 /* MCS data is in the first channel of `mcs`, but we need to get it into
2601 * the .y channel of the second vec4 of params, so replicate .x across
2602 * the whole vec4 and then mask off everything except .y
2604 mcs
.swizzle
= BRW_SWIZZLE_XXXX
;
2605 emit(MOV(dst_reg(MRF
, param_base
+ 1, glsl_type::uint_type
, WRITEMASK_Y
),
2608 } else if (ir
->op
== ir_txd
) {
2609 const glsl_type
*type
= lod_type
;
2611 if (brw
->gen
>= 5) {
2612 dPdx
.swizzle
= BRW_SWIZZLE4(SWIZZLE_X
,SWIZZLE_X
,SWIZZLE_Y
,SWIZZLE_Y
);
2613 dPdy
.swizzle
= BRW_SWIZZLE4(SWIZZLE_X
,SWIZZLE_X
,SWIZZLE_Y
,SWIZZLE_Y
);
2614 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_XZ
), dPdx
));
2615 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_YW
), dPdy
));
2618 if (ir
->type
->vector_elements
== 3 || ir
->shadow_comparitor
) {
2619 dPdx
.swizzle
= BRW_SWIZZLE_ZZZZ
;
2620 dPdy
.swizzle
= BRW_SWIZZLE_ZZZZ
;
2621 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_X
), dPdx
));
2622 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_Y
), dPdy
));
2625 if (ir
->shadow_comparitor
) {
2626 emit(MOV(dst_reg(MRF
, param_base
+ 2,
2627 ir
->shadow_comparitor
->type
, WRITEMASK_Z
),
2628 shadow_comparitor
));
2631 } else /* brw->gen == 4 */ {
2632 emit(MOV(dst_reg(MRF
, param_base
+ 1, type
, WRITEMASK_XYZ
), dPdx
));
2633 emit(MOV(dst_reg(MRF
, param_base
+ 2, type
, WRITEMASK_XYZ
), dPdy
));
2636 } else if (ir
->op
== ir_tg4
&& has_nonconstant_offset
) {
2637 if (ir
->shadow_comparitor
) {
2638 emit(MOV(dst_reg(MRF
, param_base
, ir
->shadow_comparitor
->type
, WRITEMASK_W
),
2639 shadow_comparitor
));
2642 emit(MOV(dst_reg(MRF
, param_base
+ 1, glsl_type::ivec2_type
, WRITEMASK_XY
),
2650 /* fixup num layers (z) for cube arrays: hardware returns faces * layers;
2651 * spec requires layers.
2653 if (ir
->op
== ir_txs
) {
2654 glsl_type
const *type
= ir
->sampler
->type
;
2655 if (type
->sampler_dimensionality
== GLSL_SAMPLER_DIM_CUBE
&&
2656 type
->sampler_array
) {
2657 emit_math(SHADER_OPCODE_INT_QUOTIENT
,
2658 writemask(inst
->dst
, WRITEMASK_Z
),
2659 src_reg(inst
->dst
), src_reg(6));
2663 if (brw
->gen
== 6 && ir
->op
== ir_tg4
) {
2664 emit_gen6_gather_wa(key
->tex
.gen6_gather_wa
[sampler
], inst
->dst
);
2667 swizzle_result(ir
, src_reg(inst
->dst
), sampler
);
2671 * Apply workarounds for Gen6 gather with UINT/SINT
2674 vec4_visitor::emit_gen6_gather_wa(uint8_t wa
, dst_reg dst
)
2679 int width
= (wa
& WA_8BIT
) ? 8 : 16;
2680 dst_reg dst_f
= dst
;
2681 dst_f
.type
= BRW_REGISTER_TYPE_F
;
2683 /* Convert from UNORM to UINT */
2684 emit(MUL(dst_f
, src_reg(dst_f
), src_reg((float)((1 << width
) - 1))));
2685 emit(MOV(dst
, src_reg(dst_f
)));
2688 /* Reinterpret the UINT value as a signed INT value by
2689 * shifting the sign bit into place, then shifting back
2692 emit(SHL(dst
, src_reg(dst
), src_reg(32 - width
)));
2693 emit(ASR(dst
, src_reg(dst
), src_reg(32 - width
)));
2698 * Set up the gather channel based on the swizzle, for gather4.
2701 vec4_visitor::gather_channel(ir_texture
*ir
, uint32_t sampler
)
2703 ir_constant
*chan
= ir
->lod_info
.component
->as_constant();
2704 int swiz
= GET_SWZ(key
->tex
.swizzles
[sampler
], chan
->value
.i
[0]);
2706 case SWIZZLE_X
: return 0;
2708 /* gather4 sampler is broken for green channel on RG32F --
2709 * we must ask for blue instead.
2711 if (key
->tex
.gather_channel_quirk_mask
& (1<<sampler
))
2714 case SWIZZLE_Z
: return 2;
2715 case SWIZZLE_W
: return 3;
2717 unreachable("Not reached"); /* zero, one swizzles handled already */
2722 vec4_visitor::swizzle_result(ir_texture
*ir
, src_reg orig_val
, uint32_t sampler
)
2724 int s
= key
->tex
.swizzles
[sampler
];
2726 this->result
= src_reg(this, ir
->type
);
2727 dst_reg
swizzled_result(this->result
);
2729 if (ir
->op
== ir_query_levels
) {
2730 /* # levels is in .w */
2731 orig_val
.swizzle
= BRW_SWIZZLE4(SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
);
2732 emit(MOV(swizzled_result
, orig_val
));
2736 if (ir
->op
== ir_txs
|| ir
->type
== glsl_type::float_type
2737 || s
== SWIZZLE_NOOP
|| ir
->op
== ir_tg4
) {
2738 emit(MOV(swizzled_result
, orig_val
));
2743 int zero_mask
= 0, one_mask
= 0, copy_mask
= 0;
2744 int swizzle
[4] = {0};
2746 for (int i
= 0; i
< 4; i
++) {
2747 switch (GET_SWZ(s
, i
)) {
2749 zero_mask
|= (1 << i
);
2752 one_mask
|= (1 << i
);
2755 copy_mask
|= (1 << i
);
2756 swizzle
[i
] = GET_SWZ(s
, i
);
2762 orig_val
.swizzle
= BRW_SWIZZLE4(swizzle
[0], swizzle
[1], swizzle
[2], swizzle
[3]);
2763 swizzled_result
.writemask
= copy_mask
;
2764 emit(MOV(swizzled_result
, orig_val
));
2768 swizzled_result
.writemask
= zero_mask
;
2769 emit(MOV(swizzled_result
, src_reg(0.0f
)));
2773 swizzled_result
.writemask
= one_mask
;
2774 emit(MOV(swizzled_result
, src_reg(1.0f
)));
2779 vec4_visitor::visit(ir_return
*)
2781 unreachable("not reached");
2785 vec4_visitor::visit(ir_discard
*)
2787 unreachable("not reached");
2791 vec4_visitor::visit(ir_if
*ir
)
2793 /* Don't point the annotation at the if statement, because then it plus
2794 * the then and else blocks get printed.
2796 this->base_ir
= ir
->condition
;
2798 if (brw
->gen
== 6) {
2801 enum brw_predicate predicate
;
2802 emit_bool_to_cond_code(ir
->condition
, &predicate
);
2803 emit(IF(predicate
));
2806 visit_instructions(&ir
->then_instructions
);
2808 if (!ir
->else_instructions
.is_empty()) {
2809 this->base_ir
= ir
->condition
;
2810 emit(BRW_OPCODE_ELSE
);
2812 visit_instructions(&ir
->else_instructions
);
2815 this->base_ir
= ir
->condition
;
2816 emit(BRW_OPCODE_ENDIF
);
2820 vec4_visitor::visit(ir_emit_vertex
*)
2822 unreachable("not reached");
2826 vec4_visitor::visit(ir_end_primitive
*)
2828 unreachable("not reached");
2832 vec4_visitor::emit_untyped_atomic(unsigned atomic_op
, unsigned surf_index
,
2833 dst_reg dst
, src_reg offset
,
2834 src_reg src0
, src_reg src1
)
2838 /* Set the atomic operation offset. */
2839 emit(MOV(brw_writemask(brw_uvec_mrf(8, mlen
, 0), WRITEMASK_X
), offset
));
2842 /* Set the atomic operation arguments. */
2843 if (src0
.file
!= BAD_FILE
) {
2844 emit(MOV(brw_writemask(brw_uvec_mrf(8, mlen
, 0), WRITEMASK_X
), src0
));
2848 if (src1
.file
!= BAD_FILE
) {
2849 emit(MOV(brw_writemask(brw_uvec_mrf(8, mlen
, 0), WRITEMASK_X
), src1
));
2853 /* Emit the instruction. Note that this maps to the normal SIMD8
2854 * untyped atomic message on Ivy Bridge, but that's OK because
2855 * unused channels will be masked out.
2857 vec4_instruction
*inst
= emit(SHADER_OPCODE_UNTYPED_ATOMIC
, dst
,
2858 src_reg(atomic_op
), src_reg(surf_index
));
2864 vec4_visitor::emit_untyped_surface_read(unsigned surf_index
, dst_reg dst
,
2867 /* Set the surface read offset. */
2868 emit(MOV(brw_writemask(brw_uvec_mrf(8, 0, 0), WRITEMASK_X
), offset
));
2870 /* Emit the instruction. Note that this maps to the normal SIMD8
2871 * untyped surface read message, but that's OK because unused
2872 * channels will be masked out.
2874 vec4_instruction
*inst
= emit(SHADER_OPCODE_UNTYPED_SURFACE_READ
,
2875 dst
, src_reg(surf_index
));
2881 vec4_visitor::emit_ndc_computation()
2883 /* Get the position */
2884 src_reg pos
= src_reg(output_reg
[VARYING_SLOT_POS
]);
2886 /* Build ndc coords, which are (x/w, y/w, z/w, 1/w) */
2887 dst_reg ndc
= dst_reg(this, glsl_type::vec4_type
);
2888 output_reg
[BRW_VARYING_SLOT_NDC
] = ndc
;
2890 current_annotation
= "NDC";
2891 dst_reg ndc_w
= ndc
;
2892 ndc_w
.writemask
= WRITEMASK_W
;
2893 src_reg pos_w
= pos
;
2894 pos_w
.swizzle
= BRW_SWIZZLE4(SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
, SWIZZLE_W
);
2895 emit_math(SHADER_OPCODE_RCP
, ndc_w
, pos_w
);
2897 dst_reg ndc_xyz
= ndc
;
2898 ndc_xyz
.writemask
= WRITEMASK_XYZ
;
2900 emit(MUL(ndc_xyz
, pos
, src_reg(ndc_w
)));
2904 vec4_visitor::emit_psiz_and_flags(struct brw_reg reg
)
2907 ((prog_data
->vue_map
.slots_valid
& VARYING_BIT_PSIZ
) ||
2908 key
->userclip_active
|| brw
->has_negative_rhw_bug
)) {
2909 dst_reg header1
= dst_reg(this, glsl_type::uvec4_type
);
2910 dst_reg header1_w
= header1
;
2911 header1_w
.writemask
= WRITEMASK_W
;
2913 emit(MOV(header1
, 0u));
2915 if (prog_data
->vue_map
.slots_valid
& VARYING_BIT_PSIZ
) {
2916 src_reg psiz
= src_reg(output_reg
[VARYING_SLOT_PSIZ
]);
2918 current_annotation
= "Point size";
2919 emit(MUL(header1_w
, psiz
, src_reg((float)(1 << 11))));
2920 emit(AND(header1_w
, src_reg(header1_w
), 0x7ff << 8));
2923 if (key
->userclip_active
) {
2924 current_annotation
= "Clipping flags";
2925 dst_reg flags0
= dst_reg(this, glsl_type::uint_type
);
2926 dst_reg flags1
= dst_reg(this, glsl_type::uint_type
);
2928 emit(CMP(dst_null_f(), src_reg(output_reg
[VARYING_SLOT_CLIP_DIST0
]), src_reg(0.0f
), BRW_CONDITIONAL_L
));
2929 emit(VS_OPCODE_UNPACK_FLAGS_SIMD4X2
, flags0
, src_reg(0));
2930 emit(OR(header1_w
, src_reg(header1_w
), src_reg(flags0
)));
2932 emit(CMP(dst_null_f(), src_reg(output_reg
[VARYING_SLOT_CLIP_DIST1
]), src_reg(0.0f
), BRW_CONDITIONAL_L
));
2933 emit(VS_OPCODE_UNPACK_FLAGS_SIMD4X2
, flags1
, src_reg(0));
2934 emit(SHL(flags1
, src_reg(flags1
), src_reg(4)));
2935 emit(OR(header1_w
, src_reg(header1_w
), src_reg(flags1
)));
2938 /* i965 clipping workaround:
2939 * 1) Test for -ve rhw
2941 * set ndc = (0,0,0,0)
2944 * Later, clipping will detect ucp[6] and ensure the primitive is
2945 * clipped against all fixed planes.
2947 if (brw
->has_negative_rhw_bug
) {
2948 src_reg ndc_w
= src_reg(output_reg
[BRW_VARYING_SLOT_NDC
]);
2949 ndc_w
.swizzle
= BRW_SWIZZLE_WWWW
;
2950 emit(CMP(dst_null_f(), ndc_w
, src_reg(0.0f
), BRW_CONDITIONAL_L
));
2951 vec4_instruction
*inst
;
2952 inst
= emit(OR(header1_w
, src_reg(header1_w
), src_reg(1u << 6)));
2953 inst
->predicate
= BRW_PREDICATE_NORMAL
;
2954 inst
= emit(MOV(output_reg
[BRW_VARYING_SLOT_NDC
], src_reg(0.0f
)));
2955 inst
->predicate
= BRW_PREDICATE_NORMAL
;
2958 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_UD
), src_reg(header1
)));
2959 } else if (brw
->gen
< 6) {
2960 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_UD
), 0u));
2962 emit(MOV(retype(reg
, BRW_REGISTER_TYPE_D
), src_reg(0)));
2963 if (prog_data
->vue_map
.slots_valid
& VARYING_BIT_PSIZ
) {
2964 emit(MOV(brw_writemask(reg
, WRITEMASK_W
),
2965 src_reg(output_reg
[VARYING_SLOT_PSIZ
])));
2967 if (prog_data
->vue_map
.slots_valid
& VARYING_BIT_LAYER
) {
2968 emit(MOV(retype(brw_writemask(reg
, WRITEMASK_Y
), BRW_REGISTER_TYPE_D
),
2969 src_reg(output_reg
[VARYING_SLOT_LAYER
])));
2971 if (prog_data
->vue_map
.slots_valid
& VARYING_BIT_VIEWPORT
) {
2972 emit(MOV(retype(brw_writemask(reg
, WRITEMASK_Z
), BRW_REGISTER_TYPE_D
),
2973 src_reg(output_reg
[VARYING_SLOT_VIEWPORT
])));
2979 vec4_visitor::emit_clip_distances(dst_reg reg
, int offset
)
2981 /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special Variables):
2983 * "If a linked set of shaders forming the vertex stage contains no
2984 * static write to gl_ClipVertex or gl_ClipDistance, but the
2985 * application has requested clipping against user clip planes through
2986 * the API, then the coordinate written to gl_Position is used for
2987 * comparison against the user clip planes."
2989 * This function is only called if the shader didn't write to
2990 * gl_ClipDistance. Accordingly, we use gl_ClipVertex to perform clipping
2991 * if the user wrote to it; otherwise we use gl_Position.
2993 gl_varying_slot clip_vertex
= VARYING_SLOT_CLIP_VERTEX
;
2994 if (!(prog_data
->vue_map
.slots_valid
& VARYING_BIT_CLIP_VERTEX
)) {
2995 clip_vertex
= VARYING_SLOT_POS
;
2998 for (int i
= 0; i
+ offset
< key
->nr_userclip_plane_consts
&& i
< 4;
3000 reg
.writemask
= 1 << i
;
3002 src_reg(output_reg
[clip_vertex
]),
3003 src_reg(this->userplane
[i
+ offset
])));
3008 vec4_visitor::emit_generic_urb_slot(dst_reg reg
, int varying
)
3010 assert (varying
< VARYING_SLOT_MAX
);
3011 reg
.type
= output_reg
[varying
].type
;
3012 current_annotation
= output_reg_annotation
[varying
];
3013 /* Copy the register, saturating if necessary */
3014 vec4_instruction
*inst
= emit(MOV(reg
,
3015 src_reg(output_reg
[varying
])));
3016 if ((varying
== VARYING_SLOT_COL0
||
3017 varying
== VARYING_SLOT_COL1
||
3018 varying
== VARYING_SLOT_BFC0
||
3019 varying
== VARYING_SLOT_BFC1
) &&
3020 key
->clamp_vertex_color
) {
3021 inst
->saturate
= true;
3026 vec4_visitor::emit_urb_slot(int mrf
, int varying
)
3028 struct brw_reg hw_reg
= brw_message_reg(mrf
);
3029 dst_reg reg
= dst_reg(MRF
, mrf
);
3030 reg
.type
= BRW_REGISTER_TYPE_F
;
3033 case VARYING_SLOT_PSIZ
:
3034 /* PSIZ is always in slot 0, and is coupled with other flags. */
3035 current_annotation
= "indices, point width, clip flags";
3036 emit_psiz_and_flags(hw_reg
);
3038 case BRW_VARYING_SLOT_NDC
:
3039 current_annotation
= "NDC";
3040 emit(MOV(reg
, src_reg(output_reg
[BRW_VARYING_SLOT_NDC
])));
3042 case VARYING_SLOT_POS
:
3043 current_annotation
= "gl_Position";
3044 emit(MOV(reg
, src_reg(output_reg
[VARYING_SLOT_POS
])));
3046 case VARYING_SLOT_EDGE
:
3047 /* This is present when doing unfilled polygons. We're supposed to copy
3048 * the edge flag from the user-provided vertex array
3049 * (glEdgeFlagPointer), or otherwise we'll copy from the current value
3050 * of that attribute (starts as 1.0f). This is then used in clipping to
3051 * determine which edges should be drawn as wireframe.
3053 current_annotation
= "edge flag";
3054 emit(MOV(reg
, src_reg(dst_reg(ATTR
, VERT_ATTRIB_EDGEFLAG
,
3055 glsl_type::float_type
, WRITEMASK_XYZW
))));
3057 case BRW_VARYING_SLOT_PAD
:
3058 /* No need to write to this slot */
3061 emit_generic_urb_slot(reg
, varying
);
3067 align_interleaved_urb_mlen(struct brw_context
*brw
, int mlen
)
3069 if (brw
->gen
>= 6) {
3070 /* URB data written (does not include the message header reg) must
3071 * be a multiple of 256 bits, or 2 VS registers. See vol5c.5,
3072 * section 5.4.3.2.2: URB_INTERLEAVED.
3074 * URB entries are allocated on a multiple of 1024 bits, so an
3075 * extra 128 bits written here to make the end align to 256 is
3078 if ((mlen
% 2) != 1)
3087 * Generates the VUE payload plus the necessary URB write instructions to
3090 * The VUE layout is documented in Volume 2a.
3093 vec4_visitor::emit_vertex()
3095 /* MRF 0 is reserved for the debugger, so start with message header
3100 /* In the process of generating our URB write message contents, we
3101 * may need to unspill a register or load from an array. Those
3102 * reads would use MRFs 14-15.
3104 int max_usable_mrf
= 13;
3106 /* The following assertion verifies that max_usable_mrf causes an
3107 * even-numbered amount of URB write data, which will meet gen6's
3108 * requirements for length alignment.
3110 assert ((max_usable_mrf
- base_mrf
) % 2 == 0);
3112 /* First mrf is the g0-based message header containing URB handles and
3115 emit_urb_write_header(mrf
++);
3118 emit_ndc_computation();
3121 /* Lower legacy ff and ClipVertex clipping to clip distances */
3122 if (key
->userclip_active
&& !prog
->UsesClipDistanceOut
) {
3123 current_annotation
= "user clip distances";
3125 output_reg
[VARYING_SLOT_CLIP_DIST0
] = dst_reg(this, glsl_type::vec4_type
);
3126 output_reg
[VARYING_SLOT_CLIP_DIST1
] = dst_reg(this, glsl_type::vec4_type
);
3128 emit_clip_distances(output_reg
[VARYING_SLOT_CLIP_DIST0
], 0);
3129 emit_clip_distances(output_reg
[VARYING_SLOT_CLIP_DIST1
], 4);
3132 /* We may need to split this up into several URB writes, so do them in a
3136 bool complete
= false;
3138 /* URB offset is in URB row increments, and each of our MRFs is half of
3139 * one of those, since we're doing interleaved writes.
3141 int offset
= slot
/ 2;
3144 for (; slot
< prog_data
->vue_map
.num_slots
; ++slot
) {
3145 emit_urb_slot(mrf
++, prog_data
->vue_map
.slot_to_varying
[slot
]);
3147 /* If this was max_usable_mrf, we can't fit anything more into this
3150 if (mrf
> max_usable_mrf
) {
3156 complete
= slot
>= prog_data
->vue_map
.num_slots
;
3157 current_annotation
= "URB write";
3158 vec4_instruction
*inst
= emit_urb_write_opcode(complete
);
3159 inst
->base_mrf
= base_mrf
;
3160 inst
->mlen
= align_interleaved_urb_mlen(brw
, mrf
- base_mrf
);
3161 inst
->offset
+= offset
;
3167 vec4_visitor::get_scratch_offset(vec4_instruction
*inst
,
3168 src_reg
*reladdr
, int reg_offset
)
3170 /* Because we store the values to scratch interleaved like our
3171 * vertex data, we need to scale the vec4 index by 2.
3173 int message_header_scale
= 2;
3175 /* Pre-gen6, the message header uses byte offsets instead of vec4
3176 * (16-byte) offset units.
3179 message_header_scale
*= 16;
3182 src_reg index
= src_reg(this, glsl_type::int_type
);
3184 emit_before(inst
, ADD(dst_reg(index
), *reladdr
, src_reg(reg_offset
)));
3185 emit_before(inst
, MUL(dst_reg(index
),
3186 index
, src_reg(message_header_scale
)));
3190 return src_reg(reg_offset
* message_header_scale
);
3195 vec4_visitor::get_pull_constant_offset(vec4_instruction
*inst
,
3196 src_reg
*reladdr
, int reg_offset
)
3199 src_reg index
= src_reg(this, glsl_type::int_type
);
3201 emit_before(inst
, ADD(dst_reg(index
), *reladdr
, src_reg(reg_offset
)));
3203 /* Pre-gen6, the message header uses byte offsets instead of vec4
3204 * (16-byte) offset units.
3207 emit_before(inst
, MUL(dst_reg(index
), index
, src_reg(16)));
3211 } else if (brw
->gen
>= 8) {
3212 /* Store the offset in a GRF so we can send-from-GRF. */
3213 src_reg offset
= src_reg(this, glsl_type::int_type
);
3214 emit_before(inst
, MOV(dst_reg(offset
), src_reg(reg_offset
)));
3217 int message_header_scale
= brw
->gen
< 6 ? 16 : 1;
3218 return src_reg(reg_offset
* message_header_scale
);
3223 * Emits an instruction before @inst to load the value named by @orig_src
3224 * from scratch space at @base_offset to @temp.
3226 * @base_offset is measured in 32-byte units (the size of a register).
3229 vec4_visitor::emit_scratch_read(vec4_instruction
*inst
,
3230 dst_reg temp
, src_reg orig_src
,
3233 int reg_offset
= base_offset
+ orig_src
.reg_offset
;
3234 src_reg index
= get_scratch_offset(inst
, orig_src
.reladdr
, reg_offset
);
3236 emit_before(inst
, SCRATCH_READ(temp
, index
));
3240 * Emits an instruction after @inst to store the value to be written
3241 * to @orig_dst to scratch space at @base_offset, from @temp.
3243 * @base_offset is measured in 32-byte units (the size of a register).
3246 vec4_visitor::emit_scratch_write(vec4_instruction
*inst
, int base_offset
)
3248 int reg_offset
= base_offset
+ inst
->dst
.reg_offset
;
3249 src_reg index
= get_scratch_offset(inst
, inst
->dst
.reladdr
, reg_offset
);
3251 /* Create a temporary register to store *inst's result in.
3253 * We have to be careful in MOVing from our temporary result register in
3254 * the scratch write. If we swizzle from channels of the temporary that
3255 * weren't initialized, it will confuse live interval analysis, which will
3256 * make spilling fail to make progress.
3258 src_reg temp
= src_reg(this, glsl_type::vec4_type
);
3259 temp
.type
= inst
->dst
.type
;
3260 int first_writemask_chan
= ffs(inst
->dst
.writemask
) - 1;
3262 for (int i
= 0; i
< 4; i
++)
3263 if (inst
->dst
.writemask
& (1 << i
))
3266 swizzles
[i
] = first_writemask_chan
;
3267 temp
.swizzle
= BRW_SWIZZLE4(swizzles
[0], swizzles
[1],
3268 swizzles
[2], swizzles
[3]);
3270 dst_reg dst
= dst_reg(brw_writemask(brw_vec8_grf(0, 0),
3271 inst
->dst
.writemask
));
3272 vec4_instruction
*write
= SCRATCH_WRITE(dst
, temp
, index
);
3273 write
->predicate
= inst
->predicate
;
3274 write
->ir
= inst
->ir
;
3275 write
->annotation
= inst
->annotation
;
3276 inst
->insert_after(write
);
3278 inst
->dst
.file
= temp
.file
;
3279 inst
->dst
.reg
= temp
.reg
;
3280 inst
->dst
.reg_offset
= temp
.reg_offset
;
3281 inst
->dst
.reladdr
= NULL
;
3285 * We can't generally support array access in GRF space, because a
3286 * single instruction's destination can only span 2 contiguous
3287 * registers. So, we send all GRF arrays that get variable index
3288 * access to scratch space.
3291 vec4_visitor::move_grf_array_access_to_scratch()
3293 int scratch_loc
[this->virtual_grf_count
];
3295 for (int i
= 0; i
< this->virtual_grf_count
; i
++) {
3296 scratch_loc
[i
] = -1;
3299 /* First, calculate the set of virtual GRFs that need to be punted
3300 * to scratch due to having any array access on them, and where in
3303 foreach_in_list(vec4_instruction
, inst
, &instructions
) {
3304 if (inst
->dst
.file
== GRF
&& inst
->dst
.reladdr
&&
3305 scratch_loc
[inst
->dst
.reg
] == -1) {
3306 scratch_loc
[inst
->dst
.reg
] = c
->last_scratch
;
3307 c
->last_scratch
+= this->virtual_grf_sizes
[inst
->dst
.reg
];
3310 for (int i
= 0 ; i
< 3; i
++) {
3311 src_reg
*src
= &inst
->src
[i
];
3313 if (src
->file
== GRF
&& src
->reladdr
&&
3314 scratch_loc
[src
->reg
] == -1) {
3315 scratch_loc
[src
->reg
] = c
->last_scratch
;
3316 c
->last_scratch
+= this->virtual_grf_sizes
[src
->reg
];
3321 /* Now, for anything that will be accessed through scratch, rewrite
3322 * it to load/store. Note that this is a _safe list walk, because
3323 * we may generate a new scratch_write instruction after the one
3326 foreach_in_list_safe(vec4_instruction
, inst
, &instructions
) {
3327 /* Set up the annotation tracking for new generated instructions. */
3329 current_annotation
= inst
->annotation
;
3331 if (inst
->dst
.file
== GRF
&& scratch_loc
[inst
->dst
.reg
] != -1) {
3332 emit_scratch_write(inst
, scratch_loc
[inst
->dst
.reg
]);
3335 for (int i
= 0 ; i
< 3; i
++) {
3336 if (inst
->src
[i
].file
!= GRF
|| scratch_loc
[inst
->src
[i
].reg
] == -1)
3339 dst_reg temp
= dst_reg(this, glsl_type::vec4_type
);
3341 emit_scratch_read(inst
, temp
, inst
->src
[i
],
3342 scratch_loc
[inst
->src
[i
].reg
]);
3344 inst
->src
[i
].file
= temp
.file
;
3345 inst
->src
[i
].reg
= temp
.reg
;
3346 inst
->src
[i
].reg_offset
= temp
.reg_offset
;
3347 inst
->src
[i
].reladdr
= NULL
;
3353 * Emits an instruction before @inst to load the value named by @orig_src
3354 * from the pull constant buffer (surface) at @base_offset to @temp.
3357 vec4_visitor::emit_pull_constant_load(vec4_instruction
*inst
,
3358 dst_reg temp
, src_reg orig_src
,
3361 int reg_offset
= base_offset
+ orig_src
.reg_offset
;
3362 src_reg index
= src_reg(prog_data
->base
.binding_table
.pull_constants_start
);
3363 src_reg offset
= get_pull_constant_offset(inst
, orig_src
.reladdr
, reg_offset
);
3364 vec4_instruction
*load
;
3366 if (brw
->gen
>= 7) {
3367 dst_reg grf_offset
= dst_reg(this, glsl_type::int_type
);
3368 grf_offset
.type
= offset
.type
;
3369 emit_before(inst
, MOV(grf_offset
, offset
));
3371 load
= new(mem_ctx
) vec4_instruction(this,
3372 VS_OPCODE_PULL_CONSTANT_LOAD_GEN7
,
3373 temp
, index
, src_reg(grf_offset
));
3375 load
= new(mem_ctx
) vec4_instruction(this, VS_OPCODE_PULL_CONSTANT_LOAD
,
3376 temp
, index
, offset
);
3377 load
->base_mrf
= 14;
3380 emit_before(inst
, load
);
3384 * Implements array access of uniforms by inserting a
3385 * PULL_CONSTANT_LOAD instruction.
3387 * Unlike temporary GRF array access (where we don't support it due to
3388 * the difficulty of doing relative addressing on instruction
3389 * destinations), we could potentially do array access of uniforms
3390 * that were loaded in GRF space as push constants. In real-world
3391 * usage we've seen, though, the arrays being used are always larger
3392 * than we could load as push constants, so just always move all
3393 * uniform array access out to a pull constant buffer.
3396 vec4_visitor::move_uniform_array_access_to_pull_constants()
3398 int pull_constant_loc
[this->uniforms
];
3400 for (int i
= 0; i
< this->uniforms
; i
++) {
3401 pull_constant_loc
[i
] = -1;
3404 /* Walk through and find array access of uniforms. Put a copy of that
3405 * uniform in the pull constant buffer.
3407 * Note that we don't move constant-indexed accesses to arrays. No
3408 * testing has been done of the performance impact of this choice.
3410 foreach_in_list_safe(vec4_instruction
, inst
, &instructions
) {
3411 for (int i
= 0 ; i
< 3; i
++) {
3412 if (inst
->src
[i
].file
!= UNIFORM
|| !inst
->src
[i
].reladdr
)
3415 int uniform
= inst
->src
[i
].reg
;
3417 /* If this array isn't already present in the pull constant buffer,
3420 if (pull_constant_loc
[uniform
] == -1) {
3421 const gl_constant_value
**values
=
3422 &stage_prog_data
->param
[uniform
* 4];
3424 pull_constant_loc
[uniform
] = stage_prog_data
->nr_pull_params
/ 4;
3426 assert(uniform
< uniform_array_size
);
3427 for (int j
= 0; j
< uniform_size
[uniform
] * 4; j
++) {
3428 stage_prog_data
->pull_param
[stage_prog_data
->nr_pull_params
++]
3433 /* Set up the annotation tracking for new generated instructions. */
3435 current_annotation
= inst
->annotation
;
3437 dst_reg temp
= dst_reg(this, glsl_type::vec4_type
);
3439 emit_pull_constant_load(inst
, temp
, inst
->src
[i
],
3440 pull_constant_loc
[uniform
]);
3442 inst
->src
[i
].file
= temp
.file
;
3443 inst
->src
[i
].reg
= temp
.reg
;
3444 inst
->src
[i
].reg_offset
= temp
.reg_offset
;
3445 inst
->src
[i
].reladdr
= NULL
;
3449 /* Now there are no accesses of the UNIFORM file with a reladdr, so
3450 * no need to track them as larger-than-vec4 objects. This will be
3451 * relied on in cutting out unused uniform vectors from push
3454 split_uniform_registers();
3458 vec4_visitor::resolve_ud_negate(src_reg
*reg
)
3460 if (reg
->type
!= BRW_REGISTER_TYPE_UD
||
3464 src_reg temp
= src_reg(this, glsl_type::uvec4_type
);
3465 emit(BRW_OPCODE_MOV
, dst_reg(temp
), *reg
);
3469 vec4_visitor::vec4_visitor(struct brw_context
*brw
,
3470 struct brw_vec4_compile
*c
,
3471 struct gl_program
*prog
,
3472 const struct brw_vec4_prog_key
*key
,
3473 struct brw_vec4_prog_data
*prog_data
,
3474 struct gl_shader_program
*shader_prog
,
3475 gl_shader_stage stage
,
3479 shader_time_shader_type st_base
,
3480 shader_time_shader_type st_written
,
3481 shader_time_shader_type st_reset
)
3482 : backend_visitor(brw
, shader_prog
, prog
, &prog_data
->base
, stage
),
3485 prog_data(prog_data
),
3486 sanity_param_count(0),
3488 first_non_payload_grf(0),
3489 need_all_constants_in_pull_buffer(false),
3490 debug_flag(debug_flag
),
3491 no_spills(no_spills
),
3493 st_written(st_written
),
3496 this->mem_ctx
= mem_ctx
;
3497 this->failed
= false;
3499 this->base_ir
= NULL
;
3500 this->current_annotation
= NULL
;
3501 memset(this->output_reg_annotation
, 0, sizeof(this->output_reg_annotation
));
3503 this->variable_ht
= hash_table_ctor(0,
3504 hash_table_pointer_hash
,
3505 hash_table_pointer_compare
);
3507 this->virtual_grf_start
= NULL
;
3508 this->virtual_grf_end
= NULL
;
3509 this->virtual_grf_sizes
= NULL
;
3510 this->virtual_grf_count
= 0;
3511 this->virtual_grf_reg_map
= NULL
;
3512 this->virtual_grf_reg_count
= 0;
3513 this->virtual_grf_array_size
= 0;
3514 this->live_intervals_valid
= false;
3516 this->max_grf
= brw
->gen
>= 7 ? GEN7_MRF_HACK_START
: BRW_MAX_GRF
;
3520 /* Initialize uniform_array_size to at least 1 because pre-gen6 VS requires
3521 * at least one. See setup_uniforms() in brw_vec4.cpp.
3523 this->uniform_array_size
= 1;
3525 this->uniform_array_size
= MAX2(stage_prog_data
->nr_params
, 1);
3528 this->uniform_size
= rzalloc_array(mem_ctx
, int, this->uniform_array_size
);
3529 this->uniform_vector_size
= rzalloc_array(mem_ctx
, int, this->uniform_array_size
);
3532 vec4_visitor::~vec4_visitor()
3534 hash_table_dtor(this->variable_ht
);
3539 vec4_visitor::fail(const char *format
, ...)
3549 va_start(va
, format
);
3550 msg
= ralloc_vasprintf(mem_ctx
, format
, va
);
3552 msg
= ralloc_asprintf(mem_ctx
, "vec4 compile failed: %s\n", msg
);
3554 this->fail_msg
= msg
;
3557 fprintf(stderr
, "%s", msg
);
3561 } /* namespace brw */