2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #include "compiler/glsl/ir.h"
26 #include "brw_fs_surface_builder.h"
30 using namespace brw::surface_access
;
33 fs_visitor::emit_nir_code()
35 /* emit the arrays used for inputs and outputs - load/store intrinsics will
36 * be converted to reads/writes of these arrays
40 nir_emit_system_values();
42 /* get the main function and emit it */
43 nir_foreach_function(function
, nir
) {
44 assert(strcmp(function
->name
, "main") == 0);
45 assert(function
->impl
);
46 nir_emit_impl(function
->impl
);
51 fs_visitor::nir_setup_outputs()
53 if (stage
== MESA_SHADER_TESS_CTRL
|| stage
== MESA_SHADER_FRAGMENT
)
56 unsigned vec4s
[VARYING_SLOT_TESS_MAX
] = { 0, };
58 /* Calculate the size of output registers in a separate pass, before
59 * allocating them. With ARB_enhanced_layouts, multiple output variables
60 * may occupy the same slot, but have different type sizes.
62 nir_foreach_variable(var
, &nir
->outputs
) {
63 const int loc
= var
->data
.driver_location
;
64 const unsigned var_vec4s
=
65 var
->data
.compact
? DIV_ROUND_UP(glsl_get_length(var
->type
), 4)
66 : type_size_vec4(var
->type
);
67 vec4s
[loc
] = MAX2(vec4s
[loc
], var_vec4s
);
70 nir_foreach_variable(var
, &nir
->outputs
) {
71 const int loc
= var
->data
.driver_location
;
72 if (outputs
[loc
].file
== BAD_FILE
) {
73 fs_reg reg
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 4 * vec4s
[loc
]);
74 for (unsigned i
= 0; i
< vec4s
[loc
]; i
++) {
75 outputs
[loc
+ i
] = offset(reg
, bld
, 4 * i
);
82 fs_visitor::nir_setup_uniforms()
84 /* Only the first compile gets to set up uniforms. */
85 if (push_constant_loc
) {
86 assert(pull_constant_loc
);
90 uniforms
= nir
->num_uniforms
/ 4;
92 if (stage
== MESA_SHADER_COMPUTE
) {
93 /* Add a uniform for the thread local id. It must be the last uniform
96 assert(uniforms
== prog_data
->nr_params
);
97 uint32_t *param
= brw_stage_prog_data_add_params(prog_data
, 1);
98 *param
= BRW_PARAM_BUILTIN_SUBGROUP_ID
;
99 subgroup_id
= fs_reg(UNIFORM
, uniforms
++, BRW_REGISTER_TYPE_UD
);
104 emit_system_values_block(nir_block
*block
, fs_visitor
*v
)
108 nir_foreach_instr(instr
, block
) {
109 if (instr
->type
!= nir_instr_type_intrinsic
)
112 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
113 switch (intrin
->intrinsic
) {
114 case nir_intrinsic_load_vertex_id
:
115 unreachable("should be lowered by lower_vertex_id().");
117 case nir_intrinsic_load_vertex_id_zero_base
:
118 case nir_intrinsic_load_base_vertex
:
119 case nir_intrinsic_load_instance_id
:
120 case nir_intrinsic_load_base_instance
:
121 case nir_intrinsic_load_draw_id
:
122 unreachable("should be lowered by brw_nir_lower_vs_inputs().");
124 case nir_intrinsic_load_invocation_id
:
125 if (v
->stage
== MESA_SHADER_TESS_CTRL
)
127 assert(v
->stage
== MESA_SHADER_GEOMETRY
);
128 reg
= &v
->nir_system_values
[SYSTEM_VALUE_INVOCATION_ID
];
129 if (reg
->file
== BAD_FILE
) {
130 const fs_builder abld
= v
->bld
.annotate("gl_InvocationID", NULL
);
131 fs_reg
g1(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
));
132 fs_reg iid
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
133 abld
.SHR(iid
, g1
, brw_imm_ud(27u));
138 case nir_intrinsic_load_sample_pos
:
139 assert(v
->stage
== MESA_SHADER_FRAGMENT
);
140 reg
= &v
->nir_system_values
[SYSTEM_VALUE_SAMPLE_POS
];
141 if (reg
->file
== BAD_FILE
)
142 *reg
= *v
->emit_samplepos_setup();
145 case nir_intrinsic_load_sample_id
:
146 assert(v
->stage
== MESA_SHADER_FRAGMENT
);
147 reg
= &v
->nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
];
148 if (reg
->file
== BAD_FILE
)
149 *reg
= *v
->emit_sampleid_setup();
152 case nir_intrinsic_load_sample_mask_in
:
153 assert(v
->stage
== MESA_SHADER_FRAGMENT
);
154 assert(v
->devinfo
->gen
>= 7);
155 reg
= &v
->nir_system_values
[SYSTEM_VALUE_SAMPLE_MASK_IN
];
156 if (reg
->file
== BAD_FILE
)
157 *reg
= *v
->emit_samplemaskin_setup();
160 case nir_intrinsic_load_work_group_id
:
161 assert(v
->stage
== MESA_SHADER_COMPUTE
);
162 reg
= &v
->nir_system_values
[SYSTEM_VALUE_WORK_GROUP_ID
];
163 if (reg
->file
== BAD_FILE
)
164 *reg
= *v
->emit_cs_work_group_id_setup();
167 case nir_intrinsic_load_helper_invocation
:
168 assert(v
->stage
== MESA_SHADER_FRAGMENT
);
169 reg
= &v
->nir_system_values
[SYSTEM_VALUE_HELPER_INVOCATION
];
170 if (reg
->file
== BAD_FILE
) {
171 const fs_builder abld
=
172 v
->bld
.annotate("gl_HelperInvocation", NULL
);
174 /* On Gen6+ (gl_HelperInvocation is only exposed on Gen7+) the
175 * pixel mask is in g1.7 of the thread payload.
177 * We move the per-channel pixel enable bit to the low bit of each
178 * channel by shifting the byte containing the pixel mask by the
179 * vector immediate 0x76543210UV.
181 * The region of <1,8,0> reads only 1 byte (the pixel masks for
182 * subspans 0 and 1) in SIMD8 and an additional byte (the pixel
183 * masks for 2 and 3) in SIMD16.
185 fs_reg shifted
= abld
.vgrf(BRW_REGISTER_TYPE_UW
, 1);
187 stride(byte_offset(retype(brw_vec1_grf(1, 0),
188 BRW_REGISTER_TYPE_UB
), 28),
190 brw_imm_v(0x76543210));
192 /* A set bit in the pixel mask means the channel is enabled, but
193 * that is the opposite of gl_HelperInvocation so we need to invert
196 * The negate source-modifier bit of logical instructions on Gen8+
197 * performs 1's complement negation, so we can use that instead of
200 fs_reg inverted
= negate(shifted
);
201 if (v
->devinfo
->gen
< 8) {
202 inverted
= abld
.vgrf(BRW_REGISTER_TYPE_UW
);
203 abld
.NOT(inverted
, shifted
);
206 /* We then resolve the 0/1 result to 0/~0 boolean values by ANDing
207 * with 1 and negating.
209 fs_reg anded
= abld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
210 abld
.AND(anded
, inverted
, brw_imm_uw(1));
212 fs_reg dst
= abld
.vgrf(BRW_REGISTER_TYPE_D
, 1);
213 abld
.MOV(dst
, negate(retype(anded
, BRW_REGISTER_TYPE_D
)));
227 fs_visitor::nir_emit_system_values()
229 nir_system_values
= ralloc_array(mem_ctx
, fs_reg
, SYSTEM_VALUE_MAX
);
230 for (unsigned i
= 0; i
< SYSTEM_VALUE_MAX
; i
++) {
231 nir_system_values
[i
] = fs_reg();
234 /* Always emit SUBGROUP_INVOCATION. Dead code will clean it up if we
235 * never end up using it.
238 const fs_builder abld
= bld
.annotate("gl_SubgroupInvocation", NULL
);
239 fs_reg
®
= nir_system_values
[SYSTEM_VALUE_SUBGROUP_INVOCATION
];
240 reg
= abld
.vgrf(BRW_REGISTER_TYPE_W
);
242 const fs_builder allbld8
= abld
.group(8, 0).exec_all();
243 allbld8
.MOV(reg
, brw_imm_v(0x76543210));
244 if (dispatch_width
> 8)
245 allbld8
.ADD(byte_offset(reg
, 16), reg
, brw_imm_uw(8u));
246 if (dispatch_width
> 16) {
247 const fs_builder allbld16
= abld
.group(16, 0).exec_all();
248 allbld16
.ADD(byte_offset(reg
, 32), reg
, brw_imm_uw(16u));
252 nir_foreach_function(function
, nir
) {
253 assert(strcmp(function
->name
, "main") == 0);
254 assert(function
->impl
);
255 nir_foreach_block(block
, function
->impl
) {
256 emit_system_values_block(block
, this);
262 * Returns a type based on a reference_type (word, float, half-float) and a
265 * Reference BRW_REGISTER_TYPE are HF,F,DF,W,D,UW,UD.
267 * @FIXME: 64-bit return types are always DF on integer types to maintain
268 * compability with uses of DF previously to the introduction of int64
272 brw_reg_type_from_bit_size(const unsigned bit_size
,
273 const brw_reg_type reference_type
)
275 switch(reference_type
) {
276 case BRW_REGISTER_TYPE_HF
:
277 case BRW_REGISTER_TYPE_F
:
278 case BRW_REGISTER_TYPE_DF
:
281 return BRW_REGISTER_TYPE_HF
;
283 return BRW_REGISTER_TYPE_F
;
285 return BRW_REGISTER_TYPE_DF
;
287 unreachable("Invalid bit size");
289 case BRW_REGISTER_TYPE_W
:
290 case BRW_REGISTER_TYPE_D
:
291 case BRW_REGISTER_TYPE_Q
:
294 return BRW_REGISTER_TYPE_W
;
296 return BRW_REGISTER_TYPE_D
;
298 return BRW_REGISTER_TYPE_Q
;
300 unreachable("Invalid bit size");
302 case BRW_REGISTER_TYPE_UW
:
303 case BRW_REGISTER_TYPE_UD
:
304 case BRW_REGISTER_TYPE_UQ
:
307 return BRW_REGISTER_TYPE_UW
;
309 return BRW_REGISTER_TYPE_UD
;
311 return BRW_REGISTER_TYPE_UQ
;
313 unreachable("Invalid bit size");
316 unreachable("Unknown type");
321 fs_visitor::nir_emit_impl(nir_function_impl
*impl
)
323 nir_locals
= ralloc_array(mem_ctx
, fs_reg
, impl
->reg_alloc
);
324 for (unsigned i
= 0; i
< impl
->reg_alloc
; i
++) {
325 nir_locals
[i
] = fs_reg();
328 foreach_list_typed(nir_register
, reg
, node
, &impl
->registers
) {
329 unsigned array_elems
=
330 reg
->num_array_elems
== 0 ? 1 : reg
->num_array_elems
;
331 unsigned size
= array_elems
* reg
->num_components
;
332 const brw_reg_type reg_type
=
333 brw_reg_type_from_bit_size(reg
->bit_size
, BRW_REGISTER_TYPE_F
);
334 nir_locals
[reg
->index
] = bld
.vgrf(reg_type
, size
);
337 nir_ssa_values
= reralloc(mem_ctx
, nir_ssa_values
, fs_reg
,
340 nir_emit_cf_list(&impl
->body
);
344 fs_visitor::nir_emit_cf_list(exec_list
*list
)
346 exec_list_validate(list
);
347 foreach_list_typed(nir_cf_node
, node
, node
, list
) {
348 switch (node
->type
) {
350 nir_emit_if(nir_cf_node_as_if(node
));
353 case nir_cf_node_loop
:
354 nir_emit_loop(nir_cf_node_as_loop(node
));
357 case nir_cf_node_block
:
358 nir_emit_block(nir_cf_node_as_block(node
));
362 unreachable("Invalid CFG node block");
368 fs_visitor::nir_emit_if(nir_if
*if_stmt
)
370 /* first, put the condition into f0 */
371 fs_inst
*inst
= bld
.MOV(bld
.null_reg_d(),
372 retype(get_nir_src(if_stmt
->condition
),
373 BRW_REGISTER_TYPE_D
));
374 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
376 bld
.IF(BRW_PREDICATE_NORMAL
);
378 nir_emit_cf_list(&if_stmt
->then_list
);
380 /* note: if the else is empty, dead CF elimination will remove it */
381 bld
.emit(BRW_OPCODE_ELSE
);
383 nir_emit_cf_list(&if_stmt
->else_list
);
385 bld
.emit(BRW_OPCODE_ENDIF
);
389 fs_visitor::nir_emit_loop(nir_loop
*loop
)
391 bld
.emit(BRW_OPCODE_DO
);
393 nir_emit_cf_list(&loop
->body
);
395 bld
.emit(BRW_OPCODE_WHILE
);
399 fs_visitor::nir_emit_block(nir_block
*block
)
401 nir_foreach_instr(instr
, block
) {
402 nir_emit_instr(instr
);
407 fs_visitor::nir_emit_instr(nir_instr
*instr
)
409 const fs_builder abld
= bld
.annotate(NULL
, instr
);
411 switch (instr
->type
) {
412 case nir_instr_type_alu
:
413 nir_emit_alu(abld
, nir_instr_as_alu(instr
));
416 case nir_instr_type_intrinsic
:
418 case MESA_SHADER_VERTEX
:
419 nir_emit_vs_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
421 case MESA_SHADER_TESS_CTRL
:
422 nir_emit_tcs_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
424 case MESA_SHADER_TESS_EVAL
:
425 nir_emit_tes_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
427 case MESA_SHADER_GEOMETRY
:
428 nir_emit_gs_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
430 case MESA_SHADER_FRAGMENT
:
431 nir_emit_fs_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
433 case MESA_SHADER_COMPUTE
:
434 nir_emit_cs_intrinsic(abld
, nir_instr_as_intrinsic(instr
));
437 unreachable("unsupported shader stage");
441 case nir_instr_type_tex
:
442 nir_emit_texture(abld
, nir_instr_as_tex(instr
));
445 case nir_instr_type_load_const
:
446 nir_emit_load_const(abld
, nir_instr_as_load_const(instr
));
449 case nir_instr_type_ssa_undef
:
450 /* We create a new VGRF for undefs on every use (by handling
451 * them in get_nir_src()), rather than for each definition.
452 * This helps register coalescing eliminate MOVs from undef.
456 case nir_instr_type_jump
:
457 nir_emit_jump(abld
, nir_instr_as_jump(instr
));
461 unreachable("unknown instruction type");
466 * Recognizes a parent instruction of nir_op_extract_* and changes the type to
470 fs_visitor::optimize_extract_to_float(nir_alu_instr
*instr
,
471 const fs_reg
&result
)
473 if (!instr
->src
[0].src
.is_ssa
||
474 !instr
->src
[0].src
.ssa
->parent_instr
)
477 if (instr
->src
[0].src
.ssa
->parent_instr
->type
!= nir_instr_type_alu
)
480 nir_alu_instr
*src0
=
481 nir_instr_as_alu(instr
->src
[0].src
.ssa
->parent_instr
);
483 if (src0
->op
!= nir_op_extract_u8
&& src0
->op
!= nir_op_extract_u16
&&
484 src0
->op
!= nir_op_extract_i8
&& src0
->op
!= nir_op_extract_i16
)
487 nir_const_value
*element
= nir_src_as_const_value(src0
->src
[1].src
);
488 assert(element
!= NULL
);
490 /* Element type to extract.*/
491 const brw_reg_type type
= brw_int_type(
492 src0
->op
== nir_op_extract_u16
|| src0
->op
== nir_op_extract_i16
? 2 : 1,
493 src0
->op
== nir_op_extract_i16
|| src0
->op
== nir_op_extract_i8
);
495 fs_reg op0
= get_nir_src(src0
->src
[0].src
);
496 op0
.type
= brw_type_for_nir_type(devinfo
,
497 (nir_alu_type
)(nir_op_infos
[src0
->op
].input_types
[0] |
498 nir_src_bit_size(src0
->src
[0].src
)));
499 op0
= offset(op0
, bld
, src0
->src
[0].swizzle
[0]);
501 set_saturate(instr
->dest
.saturate
,
502 bld
.MOV(result
, subscript(op0
, type
, element
->u32
[0])));
507 fs_visitor::optimize_frontfacing_ternary(nir_alu_instr
*instr
,
508 const fs_reg
&result
)
510 if (!instr
->src
[0].src
.is_ssa
||
511 instr
->src
[0].src
.ssa
->parent_instr
->type
!= nir_instr_type_intrinsic
)
514 nir_intrinsic_instr
*src0
=
515 nir_instr_as_intrinsic(instr
->src
[0].src
.ssa
->parent_instr
);
517 if (src0
->intrinsic
!= nir_intrinsic_load_front_face
)
520 nir_const_value
*value1
= nir_src_as_const_value(instr
->src
[1].src
);
521 if (!value1
|| fabsf(value1
->f32
[0]) != 1.0f
)
524 nir_const_value
*value2
= nir_src_as_const_value(instr
->src
[2].src
);
525 if (!value2
|| fabsf(value2
->f32
[0]) != 1.0f
)
528 fs_reg tmp
= vgrf(glsl_type::int_type
);
530 if (devinfo
->gen
>= 6) {
531 /* Bit 15 of g0.0 is 0 if the polygon is front facing. */
532 fs_reg g0
= fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_W
));
534 /* For (gl_FrontFacing ? 1.0 : -1.0), emit:
536 * or(8) tmp.1<2>W g0.0<0,1,0>W 0x00003f80W
537 * and(8) dst<1>D tmp<8,8,1>D 0xbf800000D
539 * and negate g0.0<0,1,0>W for (gl_FrontFacing ? -1.0 : 1.0).
541 * This negation looks like it's safe in practice, because bits 0:4 will
542 * surely be TRIANGLES
545 if (value1
->f32
[0] == -1.0f
) {
549 bld
.OR(subscript(tmp
, BRW_REGISTER_TYPE_W
, 1),
550 g0
, brw_imm_uw(0x3f80));
552 /* Bit 31 of g1.6 is 0 if the polygon is front facing. */
553 fs_reg g1_6
= fs_reg(retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_D
));
555 /* For (gl_FrontFacing ? 1.0 : -1.0), emit:
557 * or(8) tmp<1>D g1.6<0,1,0>D 0x3f800000D
558 * and(8) dst<1>D tmp<8,8,1>D 0xbf800000D
560 * and negate g1.6<0,1,0>D for (gl_FrontFacing ? -1.0 : 1.0).
562 * This negation looks like it's safe in practice, because bits 0:4 will
563 * surely be TRIANGLES
566 if (value1
->f32
[0] == -1.0f
) {
570 bld
.OR(tmp
, g1_6
, brw_imm_d(0x3f800000));
572 bld
.AND(retype(result
, BRW_REGISTER_TYPE_D
), tmp
, brw_imm_d(0xbf800000));
578 emit_find_msb_using_lzd(const fs_builder
&bld
,
579 const fs_reg
&result
,
587 /* LZD of an absolute value source almost always does the right
588 * thing. There are two problem values:
590 * * 0x80000000. Since abs(0x80000000) == 0x80000000, LZD returns
591 * 0. However, findMSB(int(0x80000000)) == 30.
593 * * 0xffffffff. Since abs(0xffffffff) == 1, LZD returns
594 * 31. Section 8.8 (Integer Functions) of the GLSL 4.50 spec says:
596 * For a value of zero or negative one, -1 will be returned.
598 * * Negative powers of two. LZD(abs(-(1<<x))) returns x, but
599 * findMSB(-(1<<x)) should return x-1.
601 * For all negative number cases, including 0x80000000 and
602 * 0xffffffff, the correct value is obtained from LZD if instead of
603 * negating the (already negative) value the logical-not is used. A
604 * conditonal logical-not can be achieved in two instructions.
606 temp
= bld
.vgrf(BRW_REGISTER_TYPE_D
);
608 bld
.ASR(temp
, src
, brw_imm_d(31));
609 bld
.XOR(temp
, temp
, src
);
612 bld
.LZD(retype(result
, BRW_REGISTER_TYPE_UD
),
613 retype(temp
, BRW_REGISTER_TYPE_UD
));
615 /* LZD counts from the MSB side, while GLSL's findMSB() wants the count
616 * from the LSB side. Subtract the result from 31 to convert the MSB
617 * count into an LSB count. If no bits are set, LZD will return 32.
618 * 31-32 = -1, which is exactly what findMSB() is supposed to return.
620 inst
= bld
.ADD(result
, retype(result
, BRW_REGISTER_TYPE_D
), brw_imm_d(31));
621 inst
->src
[0].negate
= true;
625 brw_rnd_mode_from_nir_op (const nir_op op
) {
627 case nir_op_f2f16_rtz
:
628 return BRW_RND_MODE_RTZ
;
629 case nir_op_f2f16_rtne
:
630 return BRW_RND_MODE_RTNE
;
632 unreachable("Operation doesn't support rounding mode");
637 fs_visitor::nir_emit_alu(const fs_builder
&bld
, nir_alu_instr
*instr
)
639 struct brw_wm_prog_key
*fs_key
= (struct brw_wm_prog_key
*) this->key
;
642 fs_reg result
= get_nir_dest(instr
->dest
.dest
);
643 result
.type
= brw_type_for_nir_type(devinfo
,
644 (nir_alu_type
)(nir_op_infos
[instr
->op
].output_type
|
645 nir_dest_bit_size(instr
->dest
.dest
)));
648 for (unsigned i
= 0; i
< nir_op_infos
[instr
->op
].num_inputs
; i
++) {
649 op
[i
] = get_nir_src(instr
->src
[i
].src
);
650 op
[i
].type
= brw_type_for_nir_type(devinfo
,
651 (nir_alu_type
)(nir_op_infos
[instr
->op
].input_types
[i
] |
652 nir_src_bit_size(instr
->src
[i
].src
)));
653 op
[i
].abs
= instr
->src
[i
].abs
;
654 op
[i
].negate
= instr
->src
[i
].negate
;
657 /* We get a bunch of mov's out of the from_ssa pass and they may still
658 * be vectorized. We'll handle them as a special-case. We'll also
659 * handle vecN here because it's basically the same thing.
667 fs_reg temp
= result
;
668 bool need_extra_copy
= false;
669 for (unsigned i
= 0; i
< nir_op_infos
[instr
->op
].num_inputs
; i
++) {
670 if (!instr
->src
[i
].src
.is_ssa
&&
671 instr
->dest
.dest
.reg
.reg
== instr
->src
[i
].src
.reg
.reg
) {
672 need_extra_copy
= true;
673 temp
= bld
.vgrf(result
.type
, 4);
678 for (unsigned i
= 0; i
< 4; i
++) {
679 if (!(instr
->dest
.write_mask
& (1 << i
)))
682 if (instr
->op
== nir_op_imov
|| instr
->op
== nir_op_fmov
) {
683 inst
= bld
.MOV(offset(temp
, bld
, i
),
684 offset(op
[0], bld
, instr
->src
[0].swizzle
[i
]));
686 inst
= bld
.MOV(offset(temp
, bld
, i
),
687 offset(op
[i
], bld
, instr
->src
[i
].swizzle
[0]));
689 inst
->saturate
= instr
->dest
.saturate
;
692 /* In this case the source and destination registers were the same,
693 * so we need to insert an extra set of moves in order to deal with
696 if (need_extra_copy
) {
697 for (unsigned i
= 0; i
< 4; i
++) {
698 if (!(instr
->dest
.write_mask
& (1 << i
)))
701 bld
.MOV(offset(result
, bld
, i
), offset(temp
, bld
, i
));
710 /* At this point, we have dealt with any instruction that operates on
711 * more than a single channel. Therefore, we can just adjust the source
712 * and destination registers for that channel and emit the instruction.
714 unsigned channel
= 0;
715 if (nir_op_infos
[instr
->op
].output_size
== 0) {
716 /* Since NIR is doing the scalarizing for us, we should only ever see
717 * vectorized operations with a single channel.
719 assert(_mesa_bitcount(instr
->dest
.write_mask
) == 1);
720 channel
= ffs(instr
->dest
.write_mask
) - 1;
722 result
= offset(result
, bld
, channel
);
725 for (unsigned i
= 0; i
< nir_op_infos
[instr
->op
].num_inputs
; i
++) {
726 assert(nir_op_infos
[instr
->op
].input_sizes
[i
] < 2);
727 op
[i
] = offset(op
[i
], bld
, instr
->src
[i
].swizzle
[channel
]);
733 if (optimize_extract_to_float(instr
, result
))
735 inst
= bld
.MOV(result
, op
[0]);
736 inst
->saturate
= instr
->dest
.saturate
;
739 case nir_op_f2f16_rtne
:
740 case nir_op_f2f16_rtz
:
741 bld
.emit(SHADER_OPCODE_RND_MODE
, bld
.null_reg_ud(),
742 brw_imm_d(brw_rnd_mode_from_nir_op(instr
->op
)));
745 /* In theory, it would be better to use BRW_OPCODE_F32TO16. Depending
746 * on the HW gen, it is a special hw opcode or just a MOV, and
747 * brw_F32TO16 (at brw_eu_emit) would do the work to chose.
749 * But if we want to use that opcode, we need to provide support on
750 * different optimizations and lowerings. As right now HF support is
751 * only for gen8+, it will be better to use directly the MOV, and use
752 * BRW_OPCODE_F32TO16 when/if we work for HF support on gen7.
755 case nir_op_f2f16_undef
:
758 /* TODO: Fixing aligment rules for conversions from 32-bits to
759 * 16-bit types should be moved to lower_conversions
761 fs_reg tmp
= bld
.vgrf(op
[0].type
, 1);
762 tmp
= subscript(tmp
, result
.type
, 0);
763 inst
= bld
.MOV(tmp
, op
[0]);
764 inst
->saturate
= instr
->dest
.saturate
;
765 inst
= bld
.MOV(result
, tmp
);
766 inst
->saturate
= instr
->dest
.saturate
;
777 /* CHV PRM, vol07, 3D Media GPGPU Engine, Register Region Restrictions:
779 * "When source or destination is 64b (...), regioning in Align1
780 * must follow these rules:
782 * 1. Source and destination horizontal stride must be aligned to
786 * This means that 32-bit to 64-bit conversions need to have the 32-bit
787 * data elements aligned to 64-bit. This restriction does not apply to
790 if (nir_dest_bit_size(instr
->dest
.dest
) == 64 &&
791 nir_src_bit_size(instr
->src
[0].src
) == 32 &&
792 (devinfo
->is_cherryview
|| gen_device_info_is_9lp(devinfo
))) {
793 fs_reg tmp
= bld
.vgrf(result
.type
, 1);
794 tmp
= subscript(tmp
, op
[0].type
, 0);
795 inst
= bld
.MOV(tmp
, op
[0]);
796 inst
= bld
.MOV(result
, tmp
);
797 inst
->saturate
= instr
->dest
.saturate
;
806 inst
= bld
.MOV(result
, op
[0]);
807 inst
->saturate
= instr
->dest
.saturate
;
812 /* Straightforward since the source can be assumed to be
815 set_condmod(BRW_CONDITIONAL_NZ
, bld
.MOV(result
, op
[0]));
816 set_predicate(BRW_PREDICATE_NORMAL
, bld
.MOV(result
, brw_imm_f(1.0f
)));
818 } else if (type_sz(op
[0].type
) < 8) {
819 /* AND(val, 0x80000000) gives the sign bit.
821 * Predicated OR ORs 1.0 (0x3f800000) with the sign bit if val is not
824 bld
.CMP(bld
.null_reg_f(), op
[0], brw_imm_f(0.0f
), BRW_CONDITIONAL_NZ
);
826 fs_reg result_int
= retype(result
, BRW_REGISTER_TYPE_UD
);
827 op
[0].type
= BRW_REGISTER_TYPE_UD
;
828 result
.type
= BRW_REGISTER_TYPE_UD
;
829 bld
.AND(result_int
, op
[0], brw_imm_ud(0x80000000u
));
831 inst
= bld
.OR(result_int
, result_int
, brw_imm_ud(0x3f800000u
));
832 inst
->predicate
= BRW_PREDICATE_NORMAL
;
833 if (instr
->dest
.saturate
) {
834 inst
= bld
.MOV(result
, result
);
835 inst
->saturate
= true;
838 /* For doubles we do the same but we need to consider:
840 * - 2-src instructions can't operate with 64-bit immediates
841 * - The sign is encoded in the high 32-bit of each DF
842 * - We need to produce a DF result.
845 fs_reg zero
= vgrf(glsl_type::double_type
);
846 bld
.MOV(zero
, setup_imm_df(bld
, 0.0));
847 bld
.CMP(bld
.null_reg_df(), op
[0], zero
, BRW_CONDITIONAL_NZ
);
849 bld
.MOV(result
, zero
);
851 fs_reg r
= subscript(result
, BRW_REGISTER_TYPE_UD
, 1);
852 bld
.AND(r
, subscript(op
[0], BRW_REGISTER_TYPE_UD
, 1),
853 brw_imm_ud(0x80000000u
));
855 set_predicate(BRW_PREDICATE_NORMAL
,
856 bld
.OR(r
, r
, brw_imm_ud(0x3ff00000u
)));
858 if (instr
->dest
.saturate
) {
859 inst
= bld
.MOV(result
, result
);
860 inst
->saturate
= true;
867 /* ASR(val, 31) -> negative val generates 0xffffffff (signed -1).
868 * -> non-negative val generates 0x00000000.
869 * Predicated OR sets 1 if val is positive.
871 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
872 bld
.CMP(bld
.null_reg_d(), op
[0], brw_imm_d(0), BRW_CONDITIONAL_G
);
873 bld
.ASR(result
, op
[0], brw_imm_d(31));
874 inst
= bld
.OR(result
, result
, brw_imm_d(1));
875 inst
->predicate
= BRW_PREDICATE_NORMAL
;
879 inst
= bld
.emit(SHADER_OPCODE_RCP
, result
, op
[0]);
880 inst
->saturate
= instr
->dest
.saturate
;
884 inst
= bld
.emit(SHADER_OPCODE_EXP2
, result
, op
[0]);
885 inst
->saturate
= instr
->dest
.saturate
;
889 inst
= bld
.emit(SHADER_OPCODE_LOG2
, result
, op
[0]);
890 inst
->saturate
= instr
->dest
.saturate
;
894 inst
= bld
.emit(SHADER_OPCODE_SIN
, result
, op
[0]);
895 inst
->saturate
= instr
->dest
.saturate
;
899 inst
= bld
.emit(SHADER_OPCODE_COS
, result
, op
[0]);
900 inst
->saturate
= instr
->dest
.saturate
;
904 if (fs_key
->high_quality_derivatives
) {
905 inst
= bld
.emit(FS_OPCODE_DDX_FINE
, result
, op
[0]);
907 inst
= bld
.emit(FS_OPCODE_DDX_COARSE
, result
, op
[0]);
909 inst
->saturate
= instr
->dest
.saturate
;
911 case nir_op_fddx_fine
:
912 inst
= bld
.emit(FS_OPCODE_DDX_FINE
, result
, op
[0]);
913 inst
->saturate
= instr
->dest
.saturate
;
915 case nir_op_fddx_coarse
:
916 inst
= bld
.emit(FS_OPCODE_DDX_COARSE
, result
, op
[0]);
917 inst
->saturate
= instr
->dest
.saturate
;
920 if (fs_key
->high_quality_derivatives
) {
921 inst
= bld
.emit(FS_OPCODE_DDY_FINE
, result
, op
[0]);
923 inst
= bld
.emit(FS_OPCODE_DDY_COARSE
, result
, op
[0]);
925 inst
->saturate
= instr
->dest
.saturate
;
927 case nir_op_fddy_fine
:
928 inst
= bld
.emit(FS_OPCODE_DDY_FINE
, result
, op
[0]);
929 inst
->saturate
= instr
->dest
.saturate
;
931 case nir_op_fddy_coarse
:
932 inst
= bld
.emit(FS_OPCODE_DDY_COARSE
, result
, op
[0]);
933 inst
->saturate
= instr
->dest
.saturate
;
938 inst
= bld
.ADD(result
, op
[0], op
[1]);
939 inst
->saturate
= instr
->dest
.saturate
;
943 inst
= bld
.MUL(result
, op
[0], op
[1]);
944 inst
->saturate
= instr
->dest
.saturate
;
948 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
949 bld
.MUL(result
, op
[0], op
[1]);
952 case nir_op_imul_high
:
953 case nir_op_umul_high
:
954 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
955 bld
.emit(SHADER_OPCODE_MULH
, result
, op
[0], op
[1]);
960 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
961 bld
.emit(SHADER_OPCODE_INT_QUOTIENT
, result
, op
[0], op
[1]);
964 case nir_op_uadd_carry
:
965 unreachable("Should have been lowered by carry_to_arith().");
967 case nir_op_usub_borrow
:
968 unreachable("Should have been lowered by borrow_to_arith().");
972 /* According to the sign table for INT DIV in the Ivy Bridge PRM, it
973 * appears that our hardware just does the right thing for signed
976 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
977 bld
.emit(SHADER_OPCODE_INT_REMAINDER
, result
, op
[0], op
[1]);
981 /* Get a regular C-style remainder. If a % b == 0, set the predicate. */
982 bld
.emit(SHADER_OPCODE_INT_REMAINDER
, result
, op
[0], op
[1]);
984 /* Math instructions don't support conditional mod */
985 inst
= bld
.MOV(bld
.null_reg_d(), result
);
986 inst
->conditional_mod
= BRW_CONDITIONAL_NZ
;
988 /* Now, we need to determine if signs of the sources are different.
989 * When we XOR the sources, the top bit is 0 if they are the same and 1
990 * if they are different. We can then use a conditional modifier to
991 * turn that into a predicate. This leads us to an XOR.l instruction.
993 * Technically, according to the PRM, you're not allowed to use .l on a
994 * XOR instruction. However, emperical experiments and Curro's reading
995 * of the simulator source both indicate that it's safe.
997 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_D
);
998 inst
= bld
.XOR(tmp
, op
[0], op
[1]);
999 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1000 inst
->conditional_mod
= BRW_CONDITIONAL_L
;
1002 /* If the result of the initial remainder operation is non-zero and the
1003 * two sources have different signs, add in a copy of op[1] to get the
1004 * final integer modulus value.
1006 inst
= bld
.ADD(result
, result
, op
[1]);
1007 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1015 fs_reg dest
= result
;
1016 if (nir_src_bit_size(instr
->src
[0].src
) > 32) {
1017 dest
= bld
.vgrf(BRW_REGISTER_TYPE_DF
, 1);
1019 brw_conditional_mod cond
;
1020 switch (instr
->op
) {
1022 cond
= BRW_CONDITIONAL_L
;
1025 cond
= BRW_CONDITIONAL_GE
;
1028 cond
= BRW_CONDITIONAL_Z
;
1031 cond
= BRW_CONDITIONAL_NZ
;
1034 unreachable("bad opcode");
1036 bld
.CMP(dest
, op
[0], op
[1], cond
);
1037 if (nir_src_bit_size(instr
->src
[0].src
) > 32) {
1038 bld
.MOV(result
, subscript(dest
, BRW_REGISTER_TYPE_UD
, 0));
1049 fs_reg dest
= result
;
1050 if (nir_src_bit_size(instr
->src
[0].src
) > 32) {
1051 dest
= bld
.vgrf(BRW_REGISTER_TYPE_UQ
, 1);
1054 brw_conditional_mod cond
;
1055 switch (instr
->op
) {
1058 cond
= BRW_CONDITIONAL_L
;
1062 cond
= BRW_CONDITIONAL_GE
;
1065 cond
= BRW_CONDITIONAL_Z
;
1068 cond
= BRW_CONDITIONAL_NZ
;
1071 unreachable("bad opcode");
1073 bld
.CMP(dest
, op
[0], op
[1], cond
);
1074 if (nir_src_bit_size(instr
->src
[0].src
) > 32) {
1075 bld
.MOV(result
, subscript(dest
, BRW_REGISTER_TYPE_UD
, 0));
1081 if (devinfo
->gen
>= 8) {
1082 op
[0] = resolve_source_modifiers(op
[0]);
1084 bld
.NOT(result
, op
[0]);
1087 if (devinfo
->gen
>= 8) {
1088 op
[0] = resolve_source_modifiers(op
[0]);
1089 op
[1] = resolve_source_modifiers(op
[1]);
1091 bld
.XOR(result
, op
[0], op
[1]);
1094 if (devinfo
->gen
>= 8) {
1095 op
[0] = resolve_source_modifiers(op
[0]);
1096 op
[1] = resolve_source_modifiers(op
[1]);
1098 bld
.OR(result
, op
[0], op
[1]);
1101 if (devinfo
->gen
>= 8) {
1102 op
[0] = resolve_source_modifiers(op
[0]);
1103 op
[1] = resolve_source_modifiers(op
[1]);
1105 bld
.AND(result
, op
[0], op
[1]);
1111 case nir_op_ball_fequal2
:
1112 case nir_op_ball_iequal2
:
1113 case nir_op_ball_fequal3
:
1114 case nir_op_ball_iequal3
:
1115 case nir_op_ball_fequal4
:
1116 case nir_op_ball_iequal4
:
1117 case nir_op_bany_fnequal2
:
1118 case nir_op_bany_inequal2
:
1119 case nir_op_bany_fnequal3
:
1120 case nir_op_bany_inequal3
:
1121 case nir_op_bany_fnequal4
:
1122 case nir_op_bany_inequal4
:
1123 unreachable("Lowered by nir_lower_alu_reductions");
1125 case nir_op_fnoise1_1
:
1126 case nir_op_fnoise1_2
:
1127 case nir_op_fnoise1_3
:
1128 case nir_op_fnoise1_4
:
1129 case nir_op_fnoise2_1
:
1130 case nir_op_fnoise2_2
:
1131 case nir_op_fnoise2_3
:
1132 case nir_op_fnoise2_4
:
1133 case nir_op_fnoise3_1
:
1134 case nir_op_fnoise3_2
:
1135 case nir_op_fnoise3_3
:
1136 case nir_op_fnoise3_4
:
1137 case nir_op_fnoise4_1
:
1138 case nir_op_fnoise4_2
:
1139 case nir_op_fnoise4_3
:
1140 case nir_op_fnoise4_4
:
1141 unreachable("not reached: should be handled by lower_noise");
1144 unreachable("not reached: should be handled by ldexp_to_arith()");
1147 inst
= bld
.emit(SHADER_OPCODE_SQRT
, result
, op
[0]);
1148 inst
->saturate
= instr
->dest
.saturate
;
1152 inst
= bld
.emit(SHADER_OPCODE_RSQ
, result
, op
[0]);
1153 inst
->saturate
= instr
->dest
.saturate
;
1158 bld
.MOV(result
, negate(op
[0]));
1163 if (nir_src_bit_size(instr
->src
[0].src
) == 64) {
1164 /* two-argument instructions can't take 64-bit immediates */
1168 if (instr
->op
== nir_op_f2b
) {
1169 zero
= vgrf(glsl_type::double_type
);
1170 tmp
= vgrf(glsl_type::double_type
);
1171 bld
.MOV(zero
, setup_imm_df(bld
, 0.0));
1173 zero
= vgrf(glsl_type::int64_t_type
);
1174 tmp
= vgrf(glsl_type::int64_t_type
);
1175 bld
.MOV(zero
, brw_imm_q(0));
1178 /* A SIMD16 execution needs to be split in two instructions, so use
1179 * a vgrf instead of the flag register as dst so instruction splitting
1182 bld
.CMP(tmp
, op
[0], zero
, BRW_CONDITIONAL_NZ
);
1183 bld
.MOV(result
, subscript(tmp
, BRW_REGISTER_TYPE_UD
, 0));
1185 if (instr
->op
== nir_op_f2b
) {
1186 bld
.CMP(result
, op
[0], brw_imm_f(0.0f
), BRW_CONDITIONAL_NZ
);
1188 bld
.CMP(result
, op
[0], brw_imm_d(0), BRW_CONDITIONAL_NZ
);
1194 inst
= bld
.RNDZ(result
, op
[0]);
1195 inst
->saturate
= instr
->dest
.saturate
;
1198 case nir_op_fceil
: {
1199 op
[0].negate
= !op
[0].negate
;
1200 fs_reg temp
= vgrf(glsl_type::float_type
);
1201 bld
.RNDD(temp
, op
[0]);
1203 inst
= bld
.MOV(result
, temp
);
1204 inst
->saturate
= instr
->dest
.saturate
;
1208 inst
= bld
.RNDD(result
, op
[0]);
1209 inst
->saturate
= instr
->dest
.saturate
;
1212 inst
= bld
.FRC(result
, op
[0]);
1213 inst
->saturate
= instr
->dest
.saturate
;
1215 case nir_op_fround_even
:
1216 inst
= bld
.RNDE(result
, op
[0]);
1217 inst
->saturate
= instr
->dest
.saturate
;
1220 case nir_op_fquantize2f16
: {
1221 fs_reg tmp16
= bld
.vgrf(BRW_REGISTER_TYPE_D
);
1222 fs_reg tmp32
= bld
.vgrf(BRW_REGISTER_TYPE_F
);
1223 fs_reg zero
= bld
.vgrf(BRW_REGISTER_TYPE_F
);
1225 /* The destination stride must be at least as big as the source stride. */
1226 tmp16
.type
= BRW_REGISTER_TYPE_W
;
1229 /* Check for denormal */
1230 fs_reg abs_src0
= op
[0];
1231 abs_src0
.abs
= true;
1232 bld
.CMP(bld
.null_reg_f(), abs_src0
, brw_imm_f(ldexpf(1.0, -14)),
1234 /* Get the appropriately signed zero */
1235 bld
.AND(retype(zero
, BRW_REGISTER_TYPE_UD
),
1236 retype(op
[0], BRW_REGISTER_TYPE_UD
),
1237 brw_imm_ud(0x80000000));
1238 /* Do the actual F32 -> F16 -> F32 conversion */
1239 bld
.emit(BRW_OPCODE_F32TO16
, tmp16
, op
[0]);
1240 bld
.emit(BRW_OPCODE_F16TO32
, tmp32
, tmp16
);
1241 /* Select that or zero based on normal status */
1242 inst
= bld
.SEL(result
, zero
, tmp32
);
1243 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1244 inst
->saturate
= instr
->dest
.saturate
;
1251 inst
= bld
.emit_minmax(result
, op
[0], op
[1], BRW_CONDITIONAL_L
);
1252 inst
->saturate
= instr
->dest
.saturate
;
1258 inst
= bld
.emit_minmax(result
, op
[0], op
[1], BRW_CONDITIONAL_GE
);
1259 inst
->saturate
= instr
->dest
.saturate
;
1262 case nir_op_pack_snorm_2x16
:
1263 case nir_op_pack_snorm_4x8
:
1264 case nir_op_pack_unorm_2x16
:
1265 case nir_op_pack_unorm_4x8
:
1266 case nir_op_unpack_snorm_2x16
:
1267 case nir_op_unpack_snorm_4x8
:
1268 case nir_op_unpack_unorm_2x16
:
1269 case nir_op_unpack_unorm_4x8
:
1270 case nir_op_unpack_half_2x16
:
1271 case nir_op_pack_half_2x16
:
1272 unreachable("not reached: should be handled by lower_packing_builtins");
1274 case nir_op_unpack_half_2x16_split_x
:
1275 inst
= bld
.emit(FS_OPCODE_UNPACK_HALF_2x16_SPLIT_X
, result
, op
[0]);
1276 inst
->saturate
= instr
->dest
.saturate
;
1278 case nir_op_unpack_half_2x16_split_y
:
1279 inst
= bld
.emit(FS_OPCODE_UNPACK_HALF_2x16_SPLIT_Y
, result
, op
[0]);
1280 inst
->saturate
= instr
->dest
.saturate
;
1283 case nir_op_pack_64_2x32_split
:
1284 bld
.emit(FS_OPCODE_PACK
, result
, op
[0], op
[1]);
1287 case nir_op_unpack_64_2x32_split_x
:
1288 case nir_op_unpack_64_2x32_split_y
: {
1289 if (instr
->op
== nir_op_unpack_64_2x32_split_x
)
1290 bld
.MOV(result
, subscript(op
[0], BRW_REGISTER_TYPE_UD
, 0));
1292 bld
.MOV(result
, subscript(op
[0], BRW_REGISTER_TYPE_UD
, 1));
1297 inst
= bld
.emit(SHADER_OPCODE_POW
, result
, op
[0], op
[1]);
1298 inst
->saturate
= instr
->dest
.saturate
;
1301 case nir_op_bitfield_reverse
:
1302 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1303 bld
.BFREV(result
, op
[0]);
1306 case nir_op_bit_count
:
1307 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1308 bld
.CBIT(result
, op
[0]);
1311 case nir_op_ufind_msb
: {
1312 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1313 emit_find_msb_using_lzd(bld
, result
, op
[0], false);
1317 case nir_op_ifind_msb
: {
1318 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1320 if (devinfo
->gen
< 7) {
1321 emit_find_msb_using_lzd(bld
, result
, op
[0], true);
1323 bld
.FBH(retype(result
, BRW_REGISTER_TYPE_UD
), op
[0]);
1325 /* FBH counts from the MSB side, while GLSL's findMSB() wants the
1326 * count from the LSB side. If FBH didn't return an error
1327 * (0xFFFFFFFF), then subtract the result from 31 to convert the MSB
1328 * count into an LSB count.
1330 bld
.CMP(bld
.null_reg_d(), result
, brw_imm_d(-1), BRW_CONDITIONAL_NZ
);
1332 inst
= bld
.ADD(result
, result
, brw_imm_d(31));
1333 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1334 inst
->src
[0].negate
= true;
1339 case nir_op_find_lsb
:
1340 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1342 if (devinfo
->gen
< 7) {
1343 fs_reg temp
= vgrf(glsl_type::int_type
);
1345 /* (x & -x) generates a value that consists of only the LSB of x.
1346 * For all powers of 2, findMSB(y) == findLSB(y).
1348 fs_reg src
= retype(op
[0], BRW_REGISTER_TYPE_D
);
1349 fs_reg negated_src
= src
;
1351 /* One must be negated, and the other must be non-negated. It
1352 * doesn't matter which is which.
1354 negated_src
.negate
= true;
1357 bld
.AND(temp
, src
, negated_src
);
1358 emit_find_msb_using_lzd(bld
, result
, temp
, false);
1360 bld
.FBL(result
, op
[0]);
1364 case nir_op_ubitfield_extract
:
1365 case nir_op_ibitfield_extract
:
1366 unreachable("should have been lowered");
1369 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1370 bld
.BFE(result
, op
[2], op
[1], op
[0]);
1373 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1374 bld
.BFI1(result
, op
[0], op
[1]);
1377 assert(nir_dest_bit_size(instr
->dest
.dest
) < 64);
1378 bld
.BFI2(result
, op
[0], op
[1], op
[2]);
1381 case nir_op_bitfield_insert
:
1382 unreachable("not reached: should have been lowered");
1387 fs_reg shift_count
= op
[1];
1389 if (devinfo
->is_cherryview
|| gen_device_info_is_9lp(devinfo
)) {
1390 if (op
[1].file
== VGRF
&&
1391 (result
.type
== BRW_REGISTER_TYPE_Q
||
1392 result
.type
== BRW_REGISTER_TYPE_UQ
)) {
1393 shift_count
= fs_reg(VGRF
, alloc
.allocate(dispatch_width
/ 4),
1394 BRW_REGISTER_TYPE_UD
);
1395 shift_count
.stride
= 2;
1396 bld
.MOV(shift_count
, op
[1]);
1400 switch (instr
->op
) {
1402 bld
.SHL(result
, op
[0], shift_count
);
1405 bld
.ASR(result
, op
[0], shift_count
);
1408 bld
.SHR(result
, op
[0], shift_count
);
1411 unreachable("not reached");
1416 case nir_op_pack_half_2x16_split
:
1417 bld
.emit(FS_OPCODE_PACK_HALF_2x16_SPLIT
, result
, op
[0], op
[1]);
1421 inst
= bld
.MAD(result
, op
[2], op
[1], op
[0]);
1422 inst
->saturate
= instr
->dest
.saturate
;
1426 inst
= bld
.LRP(result
, op
[0], op
[1], op
[2]);
1427 inst
->saturate
= instr
->dest
.saturate
;
1431 if (optimize_frontfacing_ternary(instr
, result
))
1434 bld
.CMP(bld
.null_reg_d(), op
[0], brw_imm_d(0), BRW_CONDITIONAL_NZ
);
1435 inst
= bld
.SEL(result
, op
[1], op
[2]);
1436 inst
->predicate
= BRW_PREDICATE_NORMAL
;
1439 case nir_op_extract_u8
:
1440 case nir_op_extract_i8
: {
1441 nir_const_value
*byte
= nir_src_as_const_value(instr
->src
[1].src
);
1442 assert(byte
!= NULL
);
1447 * There is no direct conversion from B/UB to Q/UQ or Q/UQ to B/UB.
1448 * Use two instructions and a word or DWord intermediate integer type.
1450 if (nir_dest_bit_size(instr
->dest
.dest
) == 64) {
1451 const brw_reg_type type
= brw_int_type(2, instr
->op
== nir_op_extract_i8
);
1453 if (instr
->op
== nir_op_extract_i8
) {
1454 /* If we need to sign extend, extract to a word first */
1455 fs_reg w_temp
= bld
.vgrf(BRW_REGISTER_TYPE_W
);
1456 bld
.MOV(w_temp
, subscript(op
[0], type
, byte
->u32
[0]));
1457 bld
.MOV(result
, w_temp
);
1459 /* Otherwise use an AND with 0xff and a word type */
1460 bld
.AND(result
, subscript(op
[0], type
, byte
->u32
[0] / 2), brw_imm_uw(0xff));
1463 const brw_reg_type type
= brw_int_type(1, instr
->op
== nir_op_extract_i8
);
1464 bld
.MOV(result
, subscript(op
[0], type
, byte
->u32
[0]));
1469 case nir_op_extract_u16
:
1470 case nir_op_extract_i16
: {
1471 const brw_reg_type type
= brw_int_type(2, instr
->op
== nir_op_extract_i16
);
1472 nir_const_value
*word
= nir_src_as_const_value(instr
->src
[1].src
);
1473 assert(word
!= NULL
);
1474 bld
.MOV(result
, subscript(op
[0], type
, word
->u32
[0]));
1479 unreachable("unhandled instruction");
1482 /* If we need to do a boolean resolve, replace the result with -(x & 1)
1483 * to sign extend the low bit to 0/~0
1485 if (devinfo
->gen
<= 5 &&
1486 (instr
->instr
.pass_flags
& BRW_NIR_BOOLEAN_MASK
) == BRW_NIR_BOOLEAN_NEEDS_RESOLVE
) {
1487 fs_reg masked
= vgrf(glsl_type::int_type
);
1488 bld
.AND(masked
, result
, brw_imm_d(1));
1489 masked
.negate
= true;
1490 bld
.MOV(retype(result
, BRW_REGISTER_TYPE_D
), masked
);
1495 fs_visitor::nir_emit_load_const(const fs_builder
&bld
,
1496 nir_load_const_instr
*instr
)
1498 const brw_reg_type reg_type
=
1499 brw_reg_type_from_bit_size(instr
->def
.bit_size
, BRW_REGISTER_TYPE_D
);
1500 fs_reg reg
= bld
.vgrf(reg_type
, instr
->def
.num_components
);
1502 switch (instr
->def
.bit_size
) {
1504 for (unsigned i
= 0; i
< instr
->def
.num_components
; i
++)
1505 bld
.MOV(offset(reg
, bld
, i
), brw_imm_d(instr
->value
.i32
[i
]));
1509 assert(devinfo
->gen
>= 7);
1510 if (devinfo
->gen
== 7) {
1511 /* We don't get 64-bit integer types until gen8 */
1512 for (unsigned i
= 0; i
< instr
->def
.num_components
; i
++) {
1513 bld
.MOV(retype(offset(reg
, bld
, i
), BRW_REGISTER_TYPE_DF
),
1514 setup_imm_df(bld
, instr
->value
.f64
[i
]));
1517 for (unsigned i
= 0; i
< instr
->def
.num_components
; i
++)
1518 bld
.MOV(offset(reg
, bld
, i
), brw_imm_q(instr
->value
.i64
[i
]));
1523 unreachable("Invalid bit size");
1526 nir_ssa_values
[instr
->def
.index
] = reg
;
1530 fs_visitor::get_nir_src(const nir_src
&src
)
1534 if (src
.ssa
->parent_instr
->type
== nir_instr_type_ssa_undef
) {
1535 const brw_reg_type reg_type
=
1536 brw_reg_type_from_bit_size(src
.ssa
->bit_size
, BRW_REGISTER_TYPE_D
);
1537 reg
= bld
.vgrf(reg_type
, src
.ssa
->num_components
);
1539 reg
= nir_ssa_values
[src
.ssa
->index
];
1542 /* We don't handle indirects on locals */
1543 assert(src
.reg
.indirect
== NULL
);
1544 reg
= offset(nir_locals
[src
.reg
.reg
->index
], bld
,
1545 src
.reg
.base_offset
* src
.reg
.reg
->num_components
);
1548 if (nir_src_bit_size(src
) == 64 && devinfo
->gen
== 7) {
1549 /* The only 64-bit type available on gen7 is DF, so use that. */
1550 reg
.type
= BRW_REGISTER_TYPE_DF
;
1552 /* To avoid floating-point denorm flushing problems, set the type by
1553 * default to an integer type - instructions that need floating point
1554 * semantics will set this to F if they need to
1556 reg
.type
= brw_reg_type_from_bit_size(nir_src_bit_size(src
),
1557 BRW_REGISTER_TYPE_D
);
1564 * Return an IMM for constants; otherwise call get_nir_src() as normal.
1566 * This function should not be called on any value which may be 64 bits.
1567 * We could theoretically support 64-bit on gen8+ but we choose not to
1568 * because it wouldn't work in general (no gen7 support) and there are
1569 * enough restrictions in 64-bit immediates that you can't take the return
1570 * value and treat it the same as the result of get_nir_src().
1573 fs_visitor::get_nir_src_imm(const nir_src
&src
)
1575 nir_const_value
*val
= nir_src_as_const_value(src
);
1576 assert(nir_src_bit_size(src
) == 32);
1577 return val
? fs_reg(brw_imm_d(val
->i32
[0])) : get_nir_src(src
);
1581 fs_visitor::get_nir_dest(const nir_dest
&dest
)
1584 const brw_reg_type reg_type
=
1585 brw_reg_type_from_bit_size(dest
.ssa
.bit_size
, BRW_REGISTER_TYPE_F
);
1586 nir_ssa_values
[dest
.ssa
.index
] =
1587 bld
.vgrf(reg_type
, dest
.ssa
.num_components
);
1588 return nir_ssa_values
[dest
.ssa
.index
];
1590 /* We don't handle indirects on locals */
1591 assert(dest
.reg
.indirect
== NULL
);
1592 return offset(nir_locals
[dest
.reg
.reg
->index
], bld
,
1593 dest
.reg
.base_offset
* dest
.reg
.reg
->num_components
);
1598 fs_visitor::get_nir_image_deref(const nir_deref_var
*deref
)
1600 fs_reg
image(UNIFORM
, deref
->var
->data
.driver_location
/ 4,
1601 BRW_REGISTER_TYPE_UD
);
1603 unsigned indirect_max
= 0;
1605 for (const nir_deref
*tail
= &deref
->deref
; tail
->child
;
1606 tail
= tail
->child
) {
1607 const nir_deref_array
*deref_array
= nir_deref_as_array(tail
->child
);
1608 assert(tail
->child
->deref_type
== nir_deref_type_array
);
1609 const unsigned size
= glsl_get_length(tail
->type
);
1610 const unsigned element_size
= type_size_scalar(deref_array
->deref
.type
);
1611 const unsigned base
= MIN2(deref_array
->base_offset
, size
- 1);
1612 image
= offset(image
, bld
, base
* element_size
);
1614 if (deref_array
->deref_array_type
== nir_deref_array_type_indirect
) {
1615 fs_reg tmp
= vgrf(glsl_type::uint_type
);
1617 /* Accessing an invalid surface index with the dataport can result
1618 * in a hang. According to the spec "if the index used to
1619 * select an individual element is negative or greater than or
1620 * equal to the size of the array, the results of the operation
1621 * are undefined but may not lead to termination" -- which is one
1622 * of the possible outcomes of the hang. Clamp the index to
1623 * prevent access outside of the array bounds.
1625 bld
.emit_minmax(tmp
, retype(get_nir_src(deref_array
->indirect
),
1626 BRW_REGISTER_TYPE_UD
),
1627 brw_imm_ud(size
- base
- 1), BRW_CONDITIONAL_L
);
1629 indirect_max
+= element_size
* (tail
->type
->length
- 1);
1631 bld
.MUL(tmp
, tmp
, brw_imm_ud(element_size
* 4));
1632 if (indirect
.file
== BAD_FILE
) {
1635 bld
.ADD(indirect
, indirect
, tmp
);
1640 if (indirect
.file
== BAD_FILE
) {
1643 /* Emit a pile of MOVs to load the uniform into a temporary. The
1644 * dead-code elimination pass will get rid of what we don't use.
1646 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, BRW_IMAGE_PARAM_SIZE
);
1647 for (unsigned j
= 0; j
< BRW_IMAGE_PARAM_SIZE
; j
++) {
1648 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
,
1649 offset(tmp
, bld
, j
), offset(image
, bld
, j
),
1650 indirect
, brw_imm_ud((indirect_max
+ 1) * 4));
1657 fs_visitor::emit_percomp(const fs_builder
&bld
, const fs_inst
&inst
,
1660 for (unsigned i
= 0; i
< 4; i
++) {
1661 if (!((wr_mask
>> i
) & 1))
1664 fs_inst
*new_inst
= new(mem_ctx
) fs_inst(inst
);
1665 new_inst
->dst
= offset(new_inst
->dst
, bld
, i
);
1666 for (unsigned j
= 0; j
< new_inst
->sources
; j
++)
1667 if (new_inst
->src
[j
].file
== VGRF
)
1668 new_inst
->src
[j
] = offset(new_inst
->src
[j
], bld
, i
);
1675 * Get the matching channel register datatype for an image intrinsic of the
1676 * specified GLSL image type.
1679 get_image_base_type(const glsl_type
*type
)
1681 switch ((glsl_base_type
)type
->sampled_type
) {
1682 case GLSL_TYPE_UINT
:
1683 return BRW_REGISTER_TYPE_UD
;
1685 return BRW_REGISTER_TYPE_D
;
1686 case GLSL_TYPE_FLOAT
:
1687 return BRW_REGISTER_TYPE_F
;
1689 unreachable("Not reached.");
1694 * Get the appropriate atomic op for an image atomic intrinsic.
1697 get_image_atomic_op(nir_intrinsic_op op
, const glsl_type
*type
)
1700 case nir_intrinsic_image_atomic_add
:
1702 case nir_intrinsic_image_atomic_min
:
1703 return (get_image_base_type(type
) == BRW_REGISTER_TYPE_D
?
1704 BRW_AOP_IMIN
: BRW_AOP_UMIN
);
1705 case nir_intrinsic_image_atomic_max
:
1706 return (get_image_base_type(type
) == BRW_REGISTER_TYPE_D
?
1707 BRW_AOP_IMAX
: BRW_AOP_UMAX
);
1708 case nir_intrinsic_image_atomic_and
:
1710 case nir_intrinsic_image_atomic_or
:
1712 case nir_intrinsic_image_atomic_xor
:
1714 case nir_intrinsic_image_atomic_exchange
:
1716 case nir_intrinsic_image_atomic_comp_swap
:
1717 return BRW_AOP_CMPWR
;
1719 unreachable("Not reachable.");
1724 emit_pixel_interpolater_send(const fs_builder
&bld
,
1729 glsl_interp_mode interpolation
)
1731 struct brw_wm_prog_data
*wm_prog_data
=
1732 brw_wm_prog_data(bld
.shader
->stage_prog_data
);
1737 if (src
.file
== BAD_FILE
) {
1739 payload
= bld
.vgrf(BRW_REGISTER_TYPE_F
, 1);
1743 mlen
= 2 * bld
.dispatch_width() / 8;
1746 inst
= bld
.emit(opcode
, dst
, payload
, desc
);
1748 /* 2 floats per slot returned */
1749 inst
->size_written
= 2 * dst
.component_size(inst
->exec_size
);
1750 inst
->pi_noperspective
= interpolation
== INTERP_MODE_NOPERSPECTIVE
;
1752 wm_prog_data
->pulls_bary
= true;
1758 * Computes 1 << x, given a D/UD register containing some value x.
1761 intexp2(const fs_builder
&bld
, const fs_reg
&x
)
1763 assert(x
.type
== BRW_REGISTER_TYPE_UD
|| x
.type
== BRW_REGISTER_TYPE_D
);
1765 fs_reg result
= bld
.vgrf(x
.type
, 1);
1766 fs_reg one
= bld
.vgrf(x
.type
, 1);
1768 bld
.MOV(one
, retype(brw_imm_d(1), one
.type
));
1769 bld
.SHL(result
, one
, x
);
1774 fs_visitor::emit_gs_end_primitive(const nir_src
&vertex_count_nir_src
)
1776 assert(stage
== MESA_SHADER_GEOMETRY
);
1778 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
1780 if (gs_compile
->control_data_header_size_bits
== 0)
1783 /* We can only do EndPrimitive() functionality when the control data
1784 * consists of cut bits. Fortunately, the only time it isn't is when the
1785 * output type is points, in which case EndPrimitive() is a no-op.
1787 if (gs_prog_data
->control_data_format
!=
1788 GEN7_GS_CONTROL_DATA_FORMAT_GSCTL_CUT
) {
1792 /* Cut bits use one bit per vertex. */
1793 assert(gs_compile
->control_data_bits_per_vertex
== 1);
1795 fs_reg vertex_count
= get_nir_src(vertex_count_nir_src
);
1796 vertex_count
.type
= BRW_REGISTER_TYPE_UD
;
1798 /* Cut bit n should be set to 1 if EndPrimitive() was called after emitting
1799 * vertex n, 0 otherwise. So all we need to do here is mark bit
1800 * (vertex_count - 1) % 32 in the cut_bits register to indicate that
1801 * EndPrimitive() was called after emitting vertex (vertex_count - 1);
1802 * vec4_gs_visitor::emit_control_data_bits() will take care of the rest.
1804 * Note that if EndPrimitive() is called before emitting any vertices, this
1805 * will cause us to set bit 31 of the control_data_bits register to 1.
1806 * That's fine because:
1808 * - If max_vertices < 32, then vertex number 31 (zero-based) will never be
1809 * output, so the hardware will ignore cut bit 31.
1811 * - If max_vertices == 32, then vertex number 31 is guaranteed to be the
1812 * last vertex, so setting cut bit 31 has no effect (since the primitive
1813 * is automatically ended when the GS terminates).
1815 * - If max_vertices > 32, then the ir_emit_vertex visitor will reset the
1816 * control_data_bits register to 0 when the first vertex is emitted.
1819 const fs_builder abld
= bld
.annotate("end primitive");
1821 /* control_data_bits |= 1 << ((vertex_count - 1) % 32) */
1822 fs_reg prev_count
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1823 abld
.ADD(prev_count
, vertex_count
, brw_imm_ud(0xffffffffu
));
1824 fs_reg mask
= intexp2(abld
, prev_count
);
1825 /* Note: we're relying on the fact that the GEN SHL instruction only pays
1826 * attention to the lower 5 bits of its second source argument, so on this
1827 * architecture, 1 << (vertex_count - 1) is equivalent to 1 <<
1828 * ((vertex_count - 1) % 32).
1830 abld
.OR(this->control_data_bits
, this->control_data_bits
, mask
);
1834 fs_visitor::emit_gs_control_data_bits(const fs_reg
&vertex_count
)
1836 assert(stage
== MESA_SHADER_GEOMETRY
);
1837 assert(gs_compile
->control_data_bits_per_vertex
!= 0);
1839 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
1841 const fs_builder abld
= bld
.annotate("emit control data bits");
1842 const fs_builder fwa_bld
= bld
.exec_all();
1844 /* We use a single UD register to accumulate control data bits (32 bits
1845 * for each of the SIMD8 channels). So we need to write a DWord (32 bits)
1848 * Unfortunately, the URB_WRITE_SIMD8 message uses 128-bit (OWord) offsets.
1849 * We have select a 128-bit group via the Global and Per-Slot Offsets, then
1850 * use the Channel Mask phase to enable/disable which DWord within that
1851 * group to write. (Remember, different SIMD8 channels may have emitted
1852 * different numbers of vertices, so we may need per-slot offsets.)
1854 * Channel masking presents an annoying problem: we may have to replicate
1855 * the data up to 4 times:
1857 * Msg = Handles, Per-Slot Offsets, Channel Masks, Data, Data, Data, Data.
1859 * To avoid penalizing shaders that emit a small number of vertices, we
1860 * can avoid these sometimes: if the size of the control data header is
1861 * <= 128 bits, then there is only 1 OWord. All SIMD8 channels will land
1862 * land in the same 128-bit group, so we can skip per-slot offsets.
1864 * Similarly, if the control data header is <= 32 bits, there is only one
1865 * DWord, so we can skip channel masks.
1867 enum opcode opcode
= SHADER_OPCODE_URB_WRITE_SIMD8
;
1869 fs_reg channel_mask
, per_slot_offset
;
1871 if (gs_compile
->control_data_header_size_bits
> 32) {
1872 opcode
= SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
;
1873 channel_mask
= vgrf(glsl_type::uint_type
);
1876 if (gs_compile
->control_data_header_size_bits
> 128) {
1877 opcode
= SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
;
1878 per_slot_offset
= vgrf(glsl_type::uint_type
);
1881 /* Figure out which DWord we're trying to write to using the formula:
1883 * dword_index = (vertex_count - 1) * bits_per_vertex / 32
1885 * Since bits_per_vertex is a power of two, and is known at compile
1886 * time, this can be optimized to:
1888 * dword_index = (vertex_count - 1) >> (6 - log2(bits_per_vertex))
1890 if (opcode
!= SHADER_OPCODE_URB_WRITE_SIMD8
) {
1891 fs_reg dword_index
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1892 fs_reg prev_count
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1893 abld
.ADD(prev_count
, vertex_count
, brw_imm_ud(0xffffffffu
));
1894 unsigned log2_bits_per_vertex
=
1895 util_last_bit(gs_compile
->control_data_bits_per_vertex
);
1896 abld
.SHR(dword_index
, prev_count
, brw_imm_ud(6u - log2_bits_per_vertex
));
1898 if (per_slot_offset
.file
!= BAD_FILE
) {
1899 /* Set the per-slot offset to dword_index / 4, so that we'll write to
1900 * the appropriate OWord within the control data header.
1902 abld
.SHR(per_slot_offset
, dword_index
, brw_imm_ud(2u));
1905 /* Set the channel masks to 1 << (dword_index % 4), so that we'll
1906 * write to the appropriate DWORD within the OWORD.
1908 fs_reg channel
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1909 fwa_bld
.AND(channel
, dword_index
, brw_imm_ud(3u));
1910 channel_mask
= intexp2(fwa_bld
, channel
);
1911 /* Then the channel masks need to be in bits 23:16. */
1912 fwa_bld
.SHL(channel_mask
, channel_mask
, brw_imm_ud(16u));
1915 /* Store the control data bits in the message payload and send it. */
1917 if (channel_mask
.file
!= BAD_FILE
)
1918 mlen
+= 4; /* channel masks, plus 3 extra copies of the data */
1919 if (per_slot_offset
.file
!= BAD_FILE
)
1922 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, mlen
);
1923 fs_reg
*sources
= ralloc_array(mem_ctx
, fs_reg
, mlen
);
1925 sources
[i
++] = fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
));
1926 if (per_slot_offset
.file
!= BAD_FILE
)
1927 sources
[i
++] = per_slot_offset
;
1928 if (channel_mask
.file
!= BAD_FILE
)
1929 sources
[i
++] = channel_mask
;
1931 sources
[i
++] = this->control_data_bits
;
1934 abld
.LOAD_PAYLOAD(payload
, sources
, mlen
, mlen
);
1935 fs_inst
*inst
= abld
.emit(opcode
, reg_undef
, payload
);
1937 /* We need to increment Global Offset by 256-bits to make room for
1938 * Broadwell's extra "Vertex Count" payload at the beginning of the
1939 * URB entry. Since this is an OWord message, Global Offset is counted
1940 * in 128-bit units, so we must set it to 2.
1942 if (gs_prog_data
->static_vertex_count
== -1)
1947 fs_visitor::set_gs_stream_control_data_bits(const fs_reg
&vertex_count
,
1950 /* control_data_bits |= stream_id << ((2 * (vertex_count - 1)) % 32) */
1952 /* Note: we are calling this *before* increasing vertex_count, so
1953 * this->vertex_count == vertex_count - 1 in the formula above.
1956 /* Stream mode uses 2 bits per vertex */
1957 assert(gs_compile
->control_data_bits_per_vertex
== 2);
1959 /* Must be a valid stream */
1960 assert(stream_id
< MAX_VERTEX_STREAMS
);
1962 /* Control data bits are initialized to 0 so we don't have to set any
1963 * bits when sending vertices to stream 0.
1968 const fs_builder abld
= bld
.annotate("set stream control data bits", NULL
);
1970 /* reg::sid = stream_id */
1971 fs_reg sid
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1972 abld
.MOV(sid
, brw_imm_ud(stream_id
));
1974 /* reg:shift_count = 2 * (vertex_count - 1) */
1975 fs_reg shift_count
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1976 abld
.SHL(shift_count
, vertex_count
, brw_imm_ud(1u));
1978 /* Note: we're relying on the fact that the GEN SHL instruction only pays
1979 * attention to the lower 5 bits of its second source argument, so on this
1980 * architecture, stream_id << 2 * (vertex_count - 1) is equivalent to
1981 * stream_id << ((2 * (vertex_count - 1)) % 32).
1983 fs_reg mask
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
1984 abld
.SHL(mask
, sid
, shift_count
);
1985 abld
.OR(this->control_data_bits
, this->control_data_bits
, mask
);
1989 fs_visitor::emit_gs_vertex(const nir_src
&vertex_count_nir_src
,
1992 assert(stage
== MESA_SHADER_GEOMETRY
);
1994 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
1996 fs_reg vertex_count
= get_nir_src(vertex_count_nir_src
);
1997 vertex_count
.type
= BRW_REGISTER_TYPE_UD
;
1999 /* Haswell and later hardware ignores the "Render Stream Select" bits
2000 * from the 3DSTATE_STREAMOUT packet when the SOL stage is disabled,
2001 * and instead sends all primitives down the pipeline for rasterization.
2002 * If the SOL stage is enabled, "Render Stream Select" is honored and
2003 * primitives bound to non-zero streams are discarded after stream output.
2005 * Since the only purpose of primives sent to non-zero streams is to
2006 * be recorded by transform feedback, we can simply discard all geometry
2007 * bound to these streams when transform feedback is disabled.
2009 if (stream_id
> 0 && !nir
->info
.has_transform_feedback_varyings
)
2012 /* If we're outputting 32 control data bits or less, then we can wait
2013 * until the shader is over to output them all. Otherwise we need to
2014 * output them as we go. Now is the time to do it, since we're about to
2015 * output the vertex_count'th vertex, so it's guaranteed that the
2016 * control data bits associated with the (vertex_count - 1)th vertex are
2019 if (gs_compile
->control_data_header_size_bits
> 32) {
2020 const fs_builder abld
=
2021 bld
.annotate("emit vertex: emit control data bits");
2023 /* Only emit control data bits if we've finished accumulating a batch
2024 * of 32 bits. This is the case when:
2026 * (vertex_count * bits_per_vertex) % 32 == 0
2028 * (in other words, when the last 5 bits of vertex_count *
2029 * bits_per_vertex are 0). Assuming bits_per_vertex == 2^n for some
2030 * integer n (which is always the case, since bits_per_vertex is
2031 * always 1 or 2), this is equivalent to requiring that the last 5-n
2032 * bits of vertex_count are 0:
2034 * vertex_count & (2^(5-n) - 1) == 0
2036 * 2^(5-n) == 2^5 / 2^n == 32 / bits_per_vertex, so this is
2039 * vertex_count & (32 / bits_per_vertex - 1) == 0
2041 * TODO: If vertex_count is an immediate, we could do some of this math
2042 * at compile time...
2045 abld
.AND(bld
.null_reg_d(), vertex_count
,
2046 brw_imm_ud(32u / gs_compile
->control_data_bits_per_vertex
- 1u));
2047 inst
->conditional_mod
= BRW_CONDITIONAL_Z
;
2049 abld
.IF(BRW_PREDICATE_NORMAL
);
2050 /* If vertex_count is 0, then no control data bits have been
2051 * accumulated yet, so we can skip emitting them.
2053 abld
.CMP(bld
.null_reg_d(), vertex_count
, brw_imm_ud(0u),
2054 BRW_CONDITIONAL_NEQ
);
2055 abld
.IF(BRW_PREDICATE_NORMAL
);
2056 emit_gs_control_data_bits(vertex_count
);
2057 abld
.emit(BRW_OPCODE_ENDIF
);
2059 /* Reset control_data_bits to 0 so we can start accumulating a new
2062 * Note: in the case where vertex_count == 0, this neutralizes the
2063 * effect of any call to EndPrimitive() that the shader may have
2064 * made before outputting its first vertex.
2066 inst
= abld
.MOV(this->control_data_bits
, brw_imm_ud(0u));
2067 inst
->force_writemask_all
= true;
2068 abld
.emit(BRW_OPCODE_ENDIF
);
2071 emit_urb_writes(vertex_count
);
2073 /* In stream mode we have to set control data bits for all vertices
2074 * unless we have disabled control data bits completely (which we do
2075 * do for GL_POINTS outputs that don't use streams).
2077 if (gs_compile
->control_data_header_size_bits
> 0 &&
2078 gs_prog_data
->control_data_format
==
2079 GEN7_GS_CONTROL_DATA_FORMAT_GSCTL_SID
) {
2080 set_gs_stream_control_data_bits(vertex_count
, stream_id
);
2085 fs_visitor::emit_gs_input_load(const fs_reg
&dst
,
2086 const nir_src
&vertex_src
,
2087 unsigned base_offset
,
2088 const nir_src
&offset_src
,
2089 unsigned num_components
,
2090 unsigned first_component
)
2092 struct brw_gs_prog_data
*gs_prog_data
= brw_gs_prog_data(prog_data
);
2094 nir_const_value
*vertex_const
= nir_src_as_const_value(vertex_src
);
2095 nir_const_value
*offset_const
= nir_src_as_const_value(offset_src
);
2096 const unsigned push_reg_count
= gs_prog_data
->base
.urb_read_length
* 8;
2098 /* TODO: figure out push input layout for invocations == 1 */
2099 /* TODO: make this work with 64-bit inputs */
2100 if (gs_prog_data
->invocations
== 1 &&
2101 type_sz(dst
.type
) <= 4 &&
2102 offset_const
!= NULL
&& vertex_const
!= NULL
&&
2103 4 * (base_offset
+ offset_const
->u32
[0]) < push_reg_count
) {
2104 int imm_offset
= (base_offset
+ offset_const
->u32
[0]) * 4 +
2105 vertex_const
->u32
[0] * push_reg_count
;
2106 for (unsigned i
= 0; i
< num_components
; i
++) {
2107 bld
.MOV(offset(dst
, bld
, i
),
2108 fs_reg(ATTR
, imm_offset
+ i
+ first_component
, dst
.type
));
2113 /* Resort to the pull model. Ensure the VUE handles are provided. */
2114 assert(gs_prog_data
->base
.include_vue_handles
);
2116 unsigned first_icp_handle
= gs_prog_data
->include_primitive_id
? 3 : 2;
2117 fs_reg icp_handle
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2119 if (gs_prog_data
->invocations
== 1) {
2121 /* The vertex index is constant; just select the proper URB handle. */
2123 retype(brw_vec8_grf(first_icp_handle
+ vertex_const
->i32
[0], 0),
2124 BRW_REGISTER_TYPE_UD
);
2126 /* The vertex index is non-constant. We need to use indirect
2127 * addressing to fetch the proper URB handle.
2129 * First, we start with the sequence <7, 6, 5, 4, 3, 2, 1, 0>
2130 * indicating that channel <n> should read the handle from
2131 * DWord <n>. We convert that to bytes by multiplying by 4.
2133 * Next, we convert the vertex index to bytes by multiplying
2134 * by 32 (shifting by 5), and add the two together. This is
2135 * the final indirect byte offset.
2137 fs_reg sequence
= bld
.vgrf(BRW_REGISTER_TYPE_W
, 1);
2138 fs_reg channel_offsets
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2139 fs_reg vertex_offset_bytes
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2140 fs_reg icp_offset_bytes
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2142 /* sequence = <7, 6, 5, 4, 3, 2, 1, 0> */
2143 bld
.MOV(sequence
, fs_reg(brw_imm_v(0x76543210)));
2144 /* channel_offsets = 4 * sequence = <28, 24, 20, 16, 12, 8, 4, 0> */
2145 bld
.SHL(channel_offsets
, sequence
, brw_imm_ud(2u));
2146 /* Convert vertex_index to bytes (multiply by 32) */
2147 bld
.SHL(vertex_offset_bytes
,
2148 retype(get_nir_src(vertex_src
), BRW_REGISTER_TYPE_UD
),
2150 bld
.ADD(icp_offset_bytes
, vertex_offset_bytes
, channel_offsets
);
2152 /* Use first_icp_handle as the base offset. There is one register
2153 * of URB handles per vertex, so inform the register allocator that
2154 * we might read up to nir->info.gs.vertices_in registers.
2156 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
, icp_handle
,
2157 retype(brw_vec8_grf(first_icp_handle
, 0), icp_handle
.type
),
2158 fs_reg(icp_offset_bytes
),
2159 brw_imm_ud(nir
->info
.gs
.vertices_in
* REG_SIZE
));
2162 assert(gs_prog_data
->invocations
> 1);
2165 assert(devinfo
->gen
>= 9 || vertex_const
->i32
[0] <= 5);
2167 retype(brw_vec1_grf(first_icp_handle
+
2168 vertex_const
->i32
[0] / 8,
2169 vertex_const
->i32
[0] % 8),
2170 BRW_REGISTER_TYPE_UD
));
2172 /* The vertex index is non-constant. We need to use indirect
2173 * addressing to fetch the proper URB handle.
2176 fs_reg icp_offset_bytes
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2178 /* Convert vertex_index to bytes (multiply by 4) */
2179 bld
.SHL(icp_offset_bytes
,
2180 retype(get_nir_src(vertex_src
), BRW_REGISTER_TYPE_UD
),
2183 /* Use first_icp_handle as the base offset. There is one DWord
2184 * of URB handles per vertex, so inform the register allocator that
2185 * we might read up to ceil(nir->info.gs.vertices_in / 8) registers.
2187 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
, icp_handle
,
2188 retype(brw_vec8_grf(first_icp_handle
, 0), icp_handle
.type
),
2189 fs_reg(icp_offset_bytes
),
2190 brw_imm_ud(DIV_ROUND_UP(nir
->info
.gs
.vertices_in
, 8) *
2197 fs_reg tmp_dst
= dst
;
2198 fs_reg indirect_offset
= get_nir_src(offset_src
);
2199 unsigned num_iterations
= 1;
2200 unsigned orig_num_components
= num_components
;
2202 if (type_sz(dst
.type
) == 8) {
2203 if (num_components
> 2) {
2207 fs_reg tmp
= fs_reg(VGRF
, alloc
.allocate(4), dst
.type
);
2209 first_component
= first_component
/ 2;
2212 for (unsigned iter
= 0; iter
< num_iterations
; iter
++) {
2214 /* Constant indexing - use global offset. */
2215 if (first_component
!= 0) {
2216 unsigned read_components
= num_components
+ first_component
;
2217 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2218 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, tmp
, icp_handle
);
2219 inst
->size_written
= read_components
*
2220 tmp
.component_size(inst
->exec_size
);
2221 for (unsigned i
= 0; i
< num_components
; i
++) {
2222 bld
.MOV(offset(tmp_dst
, bld
, i
),
2223 offset(tmp
, bld
, i
+ first_component
));
2226 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, tmp_dst
,
2228 inst
->size_written
= num_components
*
2229 tmp_dst
.component_size(inst
->exec_size
);
2231 inst
->offset
= base_offset
+ offset_const
->u32
[0];
2234 /* Indirect indexing - use per-slot offsets as well. */
2235 const fs_reg srcs
[] = { icp_handle
, indirect_offset
};
2236 unsigned read_components
= num_components
+ first_component
;
2237 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2238 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
2239 bld
.LOAD_PAYLOAD(payload
, srcs
, ARRAY_SIZE(srcs
), 0);
2240 if (first_component
!= 0) {
2241 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, tmp
,
2243 inst
->size_written
= read_components
*
2244 tmp
.component_size(inst
->exec_size
);
2245 for (unsigned i
= 0; i
< num_components
; i
++) {
2246 bld
.MOV(offset(tmp_dst
, bld
, i
),
2247 offset(tmp
, bld
, i
+ first_component
));
2250 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, tmp_dst
,
2252 inst
->size_written
= num_components
*
2253 tmp_dst
.component_size(inst
->exec_size
);
2255 inst
->offset
= base_offset
;
2259 if (type_sz(dst
.type
) == 8) {
2260 shuffle_32bit_load_result_to_64bit_data(
2261 bld
, tmp_dst
, retype(tmp_dst
, BRW_REGISTER_TYPE_F
), num_components
);
2263 for (unsigned c
= 0; c
< num_components
; c
++)
2264 bld
.MOV(offset(dst
, bld
, iter
* 2 + c
), offset(tmp_dst
, bld
, c
));
2267 if (num_iterations
> 1) {
2268 num_components
= orig_num_components
- 2;
2272 fs_reg new_indirect
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2273 bld
.ADD(new_indirect
, indirect_offset
, brw_imm_ud(1u));
2274 indirect_offset
= new_indirect
;
2281 fs_visitor::get_indirect_offset(nir_intrinsic_instr
*instr
)
2283 nir_src
*offset_src
= nir_get_io_offset_src(instr
);
2284 nir_const_value
*const_value
= nir_src_as_const_value(*offset_src
);
2287 /* The only constant offset we should find is 0. brw_nir.c's
2288 * add_const_offset_to_base() will fold other constant offsets
2289 * into instr->const_index[0].
2291 assert(const_value
->u32
[0] == 0);
2295 return get_nir_src(*offset_src
);
2299 do_untyped_vector_read(const fs_builder
&bld
,
2301 const fs_reg surf_index
,
2302 const fs_reg offset_reg
,
2303 unsigned num_components
)
2305 if (type_sz(dest
.type
) <= 2) {
2306 fs_reg read_offset
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
2307 bld
.MOV(read_offset
, offset_reg
);
2308 for (unsigned i
= 0; i
< num_components
; i
++) {
2310 emit_byte_scattered_read(bld
, surf_index
, read_offset
,
2312 type_sz(dest
.type
) * 8 /* bit_size */,
2313 BRW_PREDICATE_NONE
);
2314 bld
.MOV(offset(dest
, bld
, i
), subscript(read_reg
, dest
.type
, 0));
2315 bld
.ADD(read_offset
, read_offset
, brw_imm_ud(type_sz(dest
.type
)));
2317 } else if (type_sz(dest
.type
) == 4) {
2318 fs_reg read_result
= emit_untyped_read(bld
, surf_index
, offset_reg
,
2321 BRW_PREDICATE_NONE
);
2322 read_result
.type
= dest
.type
;
2323 for (unsigned i
= 0; i
< num_components
; i
++)
2324 bld
.MOV(offset(dest
, bld
, i
), offset(read_result
, bld
, i
));
2325 } else if (type_sz(dest
.type
) == 8) {
2326 /* Reading a dvec, so we need to:
2328 * 1. Multiply num_components by 2, to account for the fact that we
2329 * need to read 64-bit components.
2330 * 2. Shuffle the result of the load to form valid 64-bit elements
2331 * 3. Emit a second load (for components z/w) if needed.
2333 fs_reg read_offset
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
2334 bld
.MOV(read_offset
, offset_reg
);
2336 int iters
= num_components
<= 2 ? 1 : 2;
2338 /* Load the dvec, the first iteration loads components x/y, the second
2339 * iteration, if needed, loads components z/w
2341 for (int it
= 0; it
< iters
; it
++) {
2342 /* Compute number of components to read in this iteration */
2343 int iter_components
= MIN2(2, num_components
);
2344 num_components
-= iter_components
;
2346 /* Read. Since this message reads 32-bit components, we need to
2347 * read twice as many components.
2349 fs_reg read_result
= emit_untyped_read(bld
, surf_index
, read_offset
,
2351 iter_components
* 2,
2352 BRW_PREDICATE_NONE
);
2354 /* Shuffle the 32-bit load result into valid 64-bit data */
2355 const fs_reg packed_result
= bld
.vgrf(dest
.type
, iter_components
);
2356 shuffle_32bit_load_result_to_64bit_data(
2357 bld
, packed_result
, read_result
, iter_components
);
2359 /* Move each component to its destination */
2360 read_result
= retype(read_result
, BRW_REGISTER_TYPE_DF
);
2361 for (int c
= 0; c
< iter_components
; c
++) {
2362 bld
.MOV(offset(dest
, bld
, it
* 2 + c
),
2363 offset(packed_result
, bld
, c
));
2366 bld
.ADD(read_offset
, read_offset
, brw_imm_ud(16));
2369 unreachable("Unsupported type");
2374 fs_visitor::nir_emit_vs_intrinsic(const fs_builder
&bld
,
2375 nir_intrinsic_instr
*instr
)
2377 assert(stage
== MESA_SHADER_VERTEX
);
2380 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
2381 dest
= get_nir_dest(instr
->dest
);
2383 switch (instr
->intrinsic
) {
2384 case nir_intrinsic_load_vertex_id
:
2385 unreachable("should be lowered by lower_vertex_id()");
2387 case nir_intrinsic_load_vertex_id_zero_base
:
2388 case nir_intrinsic_load_base_vertex
:
2389 case nir_intrinsic_load_instance_id
:
2390 case nir_intrinsic_load_base_instance
:
2391 case nir_intrinsic_load_draw_id
: {
2392 gl_system_value sv
= nir_system_value_from_intrinsic(instr
->intrinsic
);
2393 fs_reg val
= nir_system_values
[sv
];
2394 assert(val
.file
!= BAD_FILE
);
2395 dest
.type
= val
.type
;
2400 case nir_intrinsic_load_input
: {
2401 fs_reg src
= fs_reg(ATTR
, nir_intrinsic_base(instr
) * 4, dest
.type
);
2402 unsigned first_component
= nir_intrinsic_component(instr
);
2403 unsigned num_components
= instr
->num_components
;
2404 enum brw_reg_type type
= dest
.type
;
2406 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
2407 assert(const_offset
&& "Indirect input loads not allowed");
2408 src
= offset(src
, bld
, const_offset
->u32
[0]);
2410 for (unsigned j
= 0; j
< num_components
; j
++) {
2411 bld
.MOV(offset(dest
, bld
, j
), offset(src
, bld
, j
+ first_component
));
2414 if (type
== BRW_REGISTER_TYPE_DF
) {
2415 /* Once the double vector is read, set again its original register
2416 * type to continue with normal execution.
2418 src
= retype(src
, type
);
2419 dest
= retype(dest
, type
);
2422 if (type_sz(src
.type
) == 8) {
2423 shuffle_32bit_load_result_to_64bit_data(bld
,
2425 retype(dest
, BRW_REGISTER_TYPE_F
),
2426 instr
->num_components
);
2432 nir_emit_intrinsic(bld
, instr
);
2438 fs_visitor::nir_emit_tcs_intrinsic(const fs_builder
&bld
,
2439 nir_intrinsic_instr
*instr
)
2441 assert(stage
== MESA_SHADER_TESS_CTRL
);
2442 struct brw_tcs_prog_key
*tcs_key
= (struct brw_tcs_prog_key
*) key
;
2443 struct brw_tcs_prog_data
*tcs_prog_data
= brw_tcs_prog_data(prog_data
);
2446 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
2447 dst
= get_nir_dest(instr
->dest
);
2449 switch (instr
->intrinsic
) {
2450 case nir_intrinsic_load_primitive_id
:
2451 bld
.MOV(dst
, fs_reg(brw_vec1_grf(0, 1)));
2453 case nir_intrinsic_load_invocation_id
:
2454 bld
.MOV(retype(dst
, invocation_id
.type
), invocation_id
);
2456 case nir_intrinsic_load_patch_vertices_in
:
2457 bld
.MOV(retype(dst
, BRW_REGISTER_TYPE_D
),
2458 brw_imm_d(tcs_key
->input_vertices
));
2461 case nir_intrinsic_barrier
: {
2462 if (tcs_prog_data
->instances
== 1)
2465 fs_reg m0
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2466 fs_reg m0_2
= component(m0
, 2);
2468 const fs_builder chanbld
= bld
.exec_all().group(1, 0);
2470 /* Zero the message header */
2471 bld
.exec_all().MOV(m0
, brw_imm_ud(0u));
2473 /* Copy "Barrier ID" from r0.2, bits 16:13 */
2474 chanbld
.AND(m0_2
, retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_UD
),
2475 brw_imm_ud(INTEL_MASK(16, 13)));
2477 /* Shift it up to bits 27:24. */
2478 chanbld
.SHL(m0_2
, m0_2
, brw_imm_ud(11));
2480 /* Set the Barrier Count and the enable bit */
2481 chanbld
.OR(m0_2
, m0_2
,
2482 brw_imm_ud(tcs_prog_data
->instances
<< 9 | (1 << 15)));
2484 bld
.emit(SHADER_OPCODE_BARRIER
, bld
.null_reg_ud(), m0
);
2488 case nir_intrinsic_load_input
:
2489 unreachable("nir_lower_io should never give us these.");
2492 case nir_intrinsic_load_per_vertex_input
: {
2493 fs_reg indirect_offset
= get_indirect_offset(instr
);
2494 unsigned imm_offset
= instr
->const_index
[0];
2496 const nir_src
&vertex_src
= instr
->src
[0];
2497 nir_const_value
*vertex_const
= nir_src_as_const_value(vertex_src
);
2504 /* Emit a MOV to resolve <0,1,0> regioning. */
2505 icp_handle
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2507 retype(brw_vec1_grf(1 + (vertex_const
->i32
[0] >> 3),
2508 vertex_const
->i32
[0] & 7),
2509 BRW_REGISTER_TYPE_UD
));
2510 } else if (tcs_prog_data
->instances
== 1 &&
2511 vertex_src
.is_ssa
&&
2512 vertex_src
.ssa
->parent_instr
->type
== nir_instr_type_intrinsic
&&
2513 nir_instr_as_intrinsic(vertex_src
.ssa
->parent_instr
)->intrinsic
== nir_intrinsic_load_invocation_id
) {
2514 /* For the common case of only 1 instance, an array index of
2515 * gl_InvocationID means reading g1. Skip all the indirect work.
2517 icp_handle
= retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
);
2519 /* The vertex index is non-constant. We need to use indirect
2520 * addressing to fetch the proper URB handle.
2522 icp_handle
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2524 /* Each ICP handle is a single DWord (4 bytes) */
2525 fs_reg vertex_offset_bytes
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2526 bld
.SHL(vertex_offset_bytes
,
2527 retype(get_nir_src(vertex_src
), BRW_REGISTER_TYPE_UD
),
2530 /* Start at g1. We might read up to 4 registers. */
2531 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
, icp_handle
,
2532 retype(brw_vec8_grf(1, 0), icp_handle
.type
), vertex_offset_bytes
,
2533 brw_imm_ud(4 * REG_SIZE
));
2536 /* We can only read two double components with each URB read, so
2537 * we send two read messages in that case, each one loading up to
2538 * two double components.
2540 unsigned num_iterations
= 1;
2541 unsigned num_components
= instr
->num_components
;
2542 unsigned first_component
= nir_intrinsic_component(instr
);
2543 fs_reg orig_dst
= dst
;
2544 if (type_sz(dst
.type
) == 8) {
2545 first_component
= first_component
/ 2;
2546 if (instr
->num_components
> 2) {
2551 fs_reg tmp
= fs_reg(VGRF
, alloc
.allocate(4), dst
.type
);
2555 for (unsigned iter
= 0; iter
< num_iterations
; iter
++) {
2556 if (indirect_offset
.file
== BAD_FILE
) {
2557 /* Constant indexing - use global offset. */
2558 if (first_component
!= 0) {
2559 unsigned read_components
= num_components
+ first_component
;
2560 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2561 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, tmp
, icp_handle
);
2562 for (unsigned i
= 0; i
< num_components
; i
++) {
2563 bld
.MOV(offset(dst
, bld
, i
),
2564 offset(tmp
, bld
, i
+ first_component
));
2567 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, dst
, icp_handle
);
2569 inst
->offset
= imm_offset
;
2572 /* Indirect indexing - use per-slot offsets as well. */
2573 const fs_reg srcs
[] = { icp_handle
, indirect_offset
};
2574 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
2575 bld
.LOAD_PAYLOAD(payload
, srcs
, ARRAY_SIZE(srcs
), 0);
2576 if (first_component
!= 0) {
2577 unsigned read_components
= num_components
+ first_component
;
2578 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2579 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, tmp
,
2581 for (unsigned i
= 0; i
< num_components
; i
++) {
2582 bld
.MOV(offset(dst
, bld
, i
),
2583 offset(tmp
, bld
, i
+ first_component
));
2586 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, dst
,
2589 inst
->offset
= imm_offset
;
2592 inst
->size_written
= (num_components
+ first_component
) *
2593 inst
->dst
.component_size(inst
->exec_size
);
2595 /* If we are reading 64-bit data using 32-bit read messages we need
2596 * build proper 64-bit data elements by shuffling the low and high
2597 * 32-bit components around like we do for other things like UBOs
2600 if (type_sz(dst
.type
) == 8) {
2601 shuffle_32bit_load_result_to_64bit_data(
2602 bld
, dst
, retype(dst
, BRW_REGISTER_TYPE_F
), num_components
);
2604 for (unsigned c
= 0; c
< num_components
; c
++) {
2605 bld
.MOV(offset(orig_dst
, bld
, iter
* 2 + c
),
2606 offset(dst
, bld
, c
));
2610 /* Copy the temporary to the destination to deal with writemasking.
2612 * Also attempt to deal with gl_PointSize being in the .w component.
2614 if (inst
->offset
== 0 && indirect_offset
.file
== BAD_FILE
) {
2615 assert(type_sz(dst
.type
) < 8);
2616 inst
->dst
= bld
.vgrf(dst
.type
, 4);
2617 inst
->size_written
= 4 * REG_SIZE
;
2618 bld
.MOV(dst
, offset(inst
->dst
, bld
, 3));
2621 /* If we are loading double data and we need a second read message
2622 * adjust the write offset
2624 if (num_iterations
> 1) {
2625 num_components
= instr
->num_components
- 2;
2632 case nir_intrinsic_load_output
:
2633 case nir_intrinsic_load_per_vertex_output
: {
2634 fs_reg indirect_offset
= get_indirect_offset(instr
);
2635 unsigned imm_offset
= instr
->const_index
[0];
2636 unsigned first_component
= nir_intrinsic_component(instr
);
2639 if (indirect_offset
.file
== BAD_FILE
) {
2640 /* Replicate the patch handle to all enabled channels */
2641 fs_reg patch_handle
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2642 bld
.MOV(patch_handle
,
2643 retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
));
2646 if (first_component
!= 0) {
2647 unsigned read_components
=
2648 instr
->num_components
+ first_component
;
2649 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2650 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, tmp
,
2652 inst
->size_written
= read_components
* REG_SIZE
;
2653 for (unsigned i
= 0; i
< instr
->num_components
; i
++) {
2654 bld
.MOV(offset(dst
, bld
, i
),
2655 offset(tmp
, bld
, i
+ first_component
));
2658 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, dst
,
2660 inst
->size_written
= instr
->num_components
* REG_SIZE
;
2662 inst
->offset
= imm_offset
;
2666 /* Indirect indexing - use per-slot offsets as well. */
2667 const fs_reg srcs
[] = {
2668 retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
),
2671 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
2672 bld
.LOAD_PAYLOAD(payload
, srcs
, ARRAY_SIZE(srcs
), 0);
2673 if (first_component
!= 0) {
2674 unsigned read_components
=
2675 instr
->num_components
+ first_component
;
2676 fs_reg tmp
= bld
.vgrf(dst
.type
, read_components
);
2677 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, tmp
,
2679 inst
->size_written
= read_components
* REG_SIZE
;
2680 for (unsigned i
= 0; i
< instr
->num_components
; i
++) {
2681 bld
.MOV(offset(dst
, bld
, i
),
2682 offset(tmp
, bld
, i
+ first_component
));
2685 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, dst
,
2687 inst
->size_written
= instr
->num_components
* REG_SIZE
;
2689 inst
->offset
= imm_offset
;
2695 case nir_intrinsic_store_output
:
2696 case nir_intrinsic_store_per_vertex_output
: {
2697 fs_reg value
= get_nir_src(instr
->src
[0]);
2698 bool is_64bit
= (instr
->src
[0].is_ssa
?
2699 instr
->src
[0].ssa
->bit_size
: instr
->src
[0].reg
.reg
->bit_size
) == 64;
2700 fs_reg indirect_offset
= get_indirect_offset(instr
);
2701 unsigned imm_offset
= instr
->const_index
[0];
2702 unsigned mask
= instr
->const_index
[1];
2703 unsigned header_regs
= 0;
2705 srcs
[header_regs
++] = retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
);
2707 if (indirect_offset
.file
!= BAD_FILE
) {
2708 srcs
[header_regs
++] = indirect_offset
;
2714 unsigned num_components
= util_last_bit(mask
);
2717 /* We can only pack two 64-bit components in a single message, so send
2718 * 2 messages if we have more components
2720 unsigned num_iterations
= 1;
2721 unsigned iter_components
= num_components
;
2722 unsigned first_component
= nir_intrinsic_component(instr
);
2724 first_component
= first_component
/ 2;
2725 if (instr
->num_components
> 2) {
2727 iter_components
= 2;
2731 mask
= mask
<< first_component
;
2733 for (unsigned iter
= 0; iter
< num_iterations
; iter
++) {
2734 if (!is_64bit
&& mask
!= WRITEMASK_XYZW
) {
2735 srcs
[header_regs
++] = brw_imm_ud(mask
<< 16);
2736 opcode
= indirect_offset
.file
!= BAD_FILE
?
2737 SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
2738 SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
;
2739 } else if (is_64bit
&& ((mask
& WRITEMASK_XY
) != WRITEMASK_XY
)) {
2740 /* Expand the 64-bit mask to 32-bit channels. We only handle
2741 * two channels in each iteration, so we only care about X/Y.
2743 unsigned mask32
= 0;
2744 if (mask
& WRITEMASK_X
)
2745 mask32
|= WRITEMASK_XY
;
2746 if (mask
& WRITEMASK_Y
)
2747 mask32
|= WRITEMASK_ZW
;
2749 /* If the mask does not include any of the channels X or Y there
2750 * is nothing to do in this iteration. Move on to the next couple
2751 * of 64-bit channels.
2759 srcs
[header_regs
++] = brw_imm_ud(mask32
<< 16);
2760 opcode
= indirect_offset
.file
!= BAD_FILE
?
2761 SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT
:
2762 SHADER_OPCODE_URB_WRITE_SIMD8_MASKED
;
2764 opcode
= indirect_offset
.file
!= BAD_FILE
?
2765 SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
:
2766 SHADER_OPCODE_URB_WRITE_SIMD8
;
2769 for (unsigned i
= 0; i
< iter_components
; i
++) {
2770 if (!(mask
& (1 << (i
+ first_component
))))
2774 srcs
[header_regs
+ i
+ first_component
] = offset(value
, bld
, i
);
2776 /* We need to shuffle the 64-bit data to match the layout
2777 * expected by our 32-bit URB write messages. We use a temporary
2780 unsigned channel
= iter
* 2 + i
;
2781 fs_reg dest
= shuffle_64bit_data_for_32bit_write(bld
,
2782 offset(value
, bld
, channel
), 1);
2784 srcs
[header_regs
+ (i
+ first_component
) * 2] = dest
;
2785 srcs
[header_regs
+ (i
+ first_component
) * 2 + 1] =
2786 offset(dest
, bld
, 1);
2791 header_regs
+ (is_64bit
? 2 * iter_components
: iter_components
) +
2792 (is_64bit
? 2 * first_component
: first_component
);
2794 bld
.vgrf(BRW_REGISTER_TYPE_UD
, mlen
);
2795 bld
.LOAD_PAYLOAD(payload
, srcs
, mlen
, header_regs
);
2797 fs_inst
*inst
= bld
.emit(opcode
, bld
.null_reg_ud(), payload
);
2798 inst
->offset
= imm_offset
;
2801 /* If this is a 64-bit attribute, select the next two 64-bit channels
2802 * to be handled in the next iteration.
2813 nir_emit_intrinsic(bld
, instr
);
2819 fs_visitor::nir_emit_tes_intrinsic(const fs_builder
&bld
,
2820 nir_intrinsic_instr
*instr
)
2822 assert(stage
== MESA_SHADER_TESS_EVAL
);
2823 struct brw_tes_prog_data
*tes_prog_data
= brw_tes_prog_data(prog_data
);
2826 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
2827 dest
= get_nir_dest(instr
->dest
);
2829 switch (instr
->intrinsic
) {
2830 case nir_intrinsic_load_primitive_id
:
2831 bld
.MOV(dest
, fs_reg(brw_vec1_grf(0, 1)));
2833 case nir_intrinsic_load_tess_coord
:
2834 /* gl_TessCoord is part of the payload in g1-3 */
2835 for (unsigned i
= 0; i
< 3; i
++) {
2836 bld
.MOV(offset(dest
, bld
, i
), fs_reg(brw_vec8_grf(1 + i
, 0)));
2840 case nir_intrinsic_load_input
:
2841 case nir_intrinsic_load_per_vertex_input
: {
2842 fs_reg indirect_offset
= get_indirect_offset(instr
);
2843 unsigned imm_offset
= instr
->const_index
[0];
2844 unsigned first_component
= nir_intrinsic_component(instr
);
2846 if (type_sz(dest
.type
) == 8) {
2847 first_component
= first_component
/ 2;
2851 if (indirect_offset
.file
== BAD_FILE
) {
2852 /* Arbitrarily only push up to 32 vec4 slots worth of data,
2853 * which is 16 registers (since each holds 2 vec4 slots).
2855 unsigned slot_count
= 1;
2856 if (type_sz(dest
.type
) == 8 && instr
->num_components
> 2)
2859 const unsigned max_push_slots
= 32;
2860 if (imm_offset
+ slot_count
<= max_push_slots
) {
2861 fs_reg src
= fs_reg(ATTR
, imm_offset
/ 2, dest
.type
);
2862 for (int i
= 0; i
< instr
->num_components
; i
++) {
2863 unsigned comp
= 16 / type_sz(dest
.type
) * (imm_offset
% 2) +
2864 i
+ first_component
;
2865 bld
.MOV(offset(dest
, bld
, i
), component(src
, comp
));
2868 tes_prog_data
->base
.urb_read_length
=
2869 MAX2(tes_prog_data
->base
.urb_read_length
,
2870 DIV_ROUND_UP(imm_offset
+ slot_count
, 2));
2872 /* Replicate the patch handle to all enabled channels */
2873 const fs_reg srcs
[] = {
2874 retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
)
2876 fs_reg patch_handle
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 1);
2877 bld
.LOAD_PAYLOAD(patch_handle
, srcs
, ARRAY_SIZE(srcs
), 0);
2879 if (first_component
!= 0) {
2880 unsigned read_components
=
2881 instr
->num_components
+ first_component
;
2882 fs_reg tmp
= bld
.vgrf(dest
.type
, read_components
);
2883 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, tmp
,
2885 inst
->size_written
= read_components
* REG_SIZE
;
2886 for (unsigned i
= 0; i
< instr
->num_components
; i
++) {
2887 bld
.MOV(offset(dest
, bld
, i
),
2888 offset(tmp
, bld
, i
+ first_component
));
2891 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8
, dest
,
2893 inst
->size_written
= instr
->num_components
* REG_SIZE
;
2896 inst
->offset
= imm_offset
;
2899 /* Indirect indexing - use per-slot offsets as well. */
2901 /* We can only read two double components with each URB read, so
2902 * we send two read messages in that case, each one loading up to
2903 * two double components.
2905 unsigned num_iterations
= 1;
2906 unsigned num_components
= instr
->num_components
;
2907 fs_reg orig_dest
= dest
;
2908 if (type_sz(dest
.type
) == 8) {
2909 if (instr
->num_components
> 2) {
2913 fs_reg tmp
= fs_reg(VGRF
, alloc
.allocate(4), dest
.type
);
2917 for (unsigned iter
= 0; iter
< num_iterations
; iter
++) {
2918 const fs_reg srcs
[] = {
2919 retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD
),
2922 fs_reg payload
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
2923 bld
.LOAD_PAYLOAD(payload
, srcs
, ARRAY_SIZE(srcs
), 0);
2925 if (first_component
!= 0) {
2926 unsigned read_components
=
2927 num_components
+ first_component
;
2928 fs_reg tmp
= bld
.vgrf(dest
.type
, read_components
);
2929 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, tmp
,
2931 for (unsigned i
= 0; i
< num_components
; i
++) {
2932 bld
.MOV(offset(dest
, bld
, i
),
2933 offset(tmp
, bld
, i
+ first_component
));
2936 inst
= bld
.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT
, dest
,
2940 inst
->offset
= imm_offset
;
2941 inst
->size_written
= (num_components
+ first_component
) *
2942 inst
->dst
.component_size(inst
->exec_size
);
2944 /* If we are reading 64-bit data using 32-bit read messages we need
2945 * build proper 64-bit data elements by shuffling the low and high
2946 * 32-bit components around like we do for other things like UBOs
2949 if (type_sz(dest
.type
) == 8) {
2950 shuffle_32bit_load_result_to_64bit_data(
2951 bld
, dest
, retype(dest
, BRW_REGISTER_TYPE_F
), num_components
);
2953 for (unsigned c
= 0; c
< num_components
; c
++) {
2954 bld
.MOV(offset(orig_dest
, bld
, iter
* 2 + c
),
2955 offset(dest
, bld
, c
));
2959 /* If we are loading double data and we need a second read message
2962 if (num_iterations
> 1) {
2963 num_components
= instr
->num_components
- 2;
2971 nir_emit_intrinsic(bld
, instr
);
2977 fs_visitor::nir_emit_gs_intrinsic(const fs_builder
&bld
,
2978 nir_intrinsic_instr
*instr
)
2980 assert(stage
== MESA_SHADER_GEOMETRY
);
2981 fs_reg indirect_offset
;
2984 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
2985 dest
= get_nir_dest(instr
->dest
);
2987 switch (instr
->intrinsic
) {
2988 case nir_intrinsic_load_primitive_id
:
2989 assert(stage
== MESA_SHADER_GEOMETRY
);
2990 assert(brw_gs_prog_data(prog_data
)->include_primitive_id
);
2991 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_UD
),
2992 retype(fs_reg(brw_vec8_grf(2, 0)), BRW_REGISTER_TYPE_UD
));
2995 case nir_intrinsic_load_input
:
2996 unreachable("load_input intrinsics are invalid for the GS stage");
2998 case nir_intrinsic_load_per_vertex_input
:
2999 emit_gs_input_load(dest
, instr
->src
[0], instr
->const_index
[0],
3000 instr
->src
[1], instr
->num_components
,
3001 nir_intrinsic_component(instr
));
3004 case nir_intrinsic_emit_vertex_with_counter
:
3005 emit_gs_vertex(instr
->src
[0], instr
->const_index
[0]);
3008 case nir_intrinsic_end_primitive_with_counter
:
3009 emit_gs_end_primitive(instr
->src
[0]);
3012 case nir_intrinsic_set_vertex_count
:
3013 bld
.MOV(this->final_gs_vertex_count
, get_nir_src(instr
->src
[0]));
3016 case nir_intrinsic_load_invocation_id
: {
3017 fs_reg val
= nir_system_values
[SYSTEM_VALUE_INVOCATION_ID
];
3018 assert(val
.file
!= BAD_FILE
);
3019 dest
.type
= val
.type
;
3025 nir_emit_intrinsic(bld
, instr
);
3031 * Fetch the current render target layer index.
3034 fetch_render_target_array_index(const fs_builder
&bld
)
3036 if (bld
.shader
->devinfo
->gen
>= 6) {
3037 /* The render target array index is provided in the thread payload as
3038 * bits 26:16 of r0.0.
3040 const fs_reg idx
= bld
.vgrf(BRW_REGISTER_TYPE_UD
);
3041 bld
.AND(idx
, brw_uw1_reg(BRW_GENERAL_REGISTER_FILE
, 0, 1),
3045 /* Pre-SNB we only ever render into the first layer of the framebuffer
3046 * since layered rendering is not implemented.
3048 return brw_imm_ud(0);
3053 * Fake non-coherent framebuffer read implemented using TXF to fetch from the
3054 * framebuffer at the current fragment coordinates and sample index.
3057 fs_visitor::emit_non_coherent_fb_read(const fs_builder
&bld
, const fs_reg
&dst
,
3060 const struct gen_device_info
*devinfo
= bld
.shader
->devinfo
;
3062 assert(bld
.shader
->stage
== MESA_SHADER_FRAGMENT
);
3063 const brw_wm_prog_key
*wm_key
=
3064 reinterpret_cast<const brw_wm_prog_key
*>(key
);
3065 assert(!wm_key
->coherent_fb_fetch
);
3066 const struct brw_wm_prog_data
*wm_prog_data
=
3067 brw_wm_prog_data(stage_prog_data
);
3069 /* Calculate the surface index relative to the start of the texture binding
3070 * table block, since that's what the texturing messages expect.
3072 const unsigned surface
= target
+
3073 wm_prog_data
->binding_table
.render_target_read_start
-
3074 wm_prog_data
->base
.binding_table
.texture_start
;
3076 brw_mark_surface_used(
3077 bld
.shader
->stage_prog_data
,
3078 wm_prog_data
->binding_table
.render_target_read_start
+ target
);
3080 /* Calculate the fragment coordinates. */
3081 const fs_reg coords
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 3);
3082 bld
.MOV(offset(coords
, bld
, 0), pixel_x
);
3083 bld
.MOV(offset(coords
, bld
, 1), pixel_y
);
3084 bld
.MOV(offset(coords
, bld
, 2), fetch_render_target_array_index(bld
));
3086 /* Calculate the sample index and MCS payload when multisampling. Luckily
3087 * the MCS fetch message behaves deterministically for UMS surfaces, so it
3088 * shouldn't be necessary to recompile based on whether the framebuffer is
3091 if (wm_key
->multisample_fbo
&&
3092 nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
].file
== BAD_FILE
)
3093 nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
] = *emit_sampleid_setup();
3095 const fs_reg sample
= nir_system_values
[SYSTEM_VALUE_SAMPLE_ID
];
3096 const fs_reg mcs
= wm_key
->multisample_fbo
?
3097 emit_mcs_fetch(coords
, 3, brw_imm_ud(surface
)) : fs_reg();
3099 /* Use either a normal or a CMS texel fetch message depending on whether
3100 * the framebuffer is single or multisample. On SKL+ use the wide CMS
3101 * message just in case the framebuffer uses 16x multisampling, it should
3102 * be equivalent to the normal CMS fetch for lower multisampling modes.
3104 const opcode op
= !wm_key
->multisample_fbo
? SHADER_OPCODE_TXF_LOGICAL
:
3105 devinfo
->gen
>= 9 ? SHADER_OPCODE_TXF_CMS_W_LOGICAL
:
3106 SHADER_OPCODE_TXF_CMS_LOGICAL
;
3108 /* Emit the instruction. */
3109 const fs_reg srcs
[] = { coords
, fs_reg(), brw_imm_ud(0), fs_reg(),
3111 brw_imm_ud(surface
), brw_imm_ud(0),
3112 fs_reg(), brw_imm_ud(3), brw_imm_ud(0) };
3113 STATIC_ASSERT(ARRAY_SIZE(srcs
) == TEX_LOGICAL_NUM_SRCS
);
3115 fs_inst
*inst
= bld
.emit(op
, dst
, srcs
, ARRAY_SIZE(srcs
));
3116 inst
->size_written
= 4 * inst
->dst
.component_size(inst
->exec_size
);
3122 * Actual coherent framebuffer read implemented using the native render target
3123 * read message. Requires SKL+.
3126 emit_coherent_fb_read(const fs_builder
&bld
, const fs_reg
&dst
, unsigned target
)
3128 assert(bld
.shader
->devinfo
->gen
>= 9);
3129 fs_inst
*inst
= bld
.emit(FS_OPCODE_FB_READ_LOGICAL
, dst
);
3130 inst
->target
= target
;
3131 inst
->size_written
= 4 * inst
->dst
.component_size(inst
->exec_size
);
3137 alloc_temporary(const fs_builder
&bld
, unsigned size
, fs_reg
*regs
, unsigned n
)
3139 if (n
&& regs
[0].file
!= BAD_FILE
) {
3143 const fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_F
, size
);
3145 for (unsigned i
= 0; i
< n
; i
++)
3153 alloc_frag_output(fs_visitor
*v
, unsigned location
)
3155 assert(v
->stage
== MESA_SHADER_FRAGMENT
);
3156 const brw_wm_prog_key
*const key
=
3157 reinterpret_cast<const brw_wm_prog_key
*>(v
->key
);
3158 const unsigned l
= GET_FIELD(location
, BRW_NIR_FRAG_OUTPUT_LOCATION
);
3159 const unsigned i
= GET_FIELD(location
, BRW_NIR_FRAG_OUTPUT_INDEX
);
3161 if (i
> 0 || (key
->force_dual_color_blend
&& l
== FRAG_RESULT_DATA1
))
3162 return alloc_temporary(v
->bld
, 4, &v
->dual_src_output
, 1);
3164 else if (l
== FRAG_RESULT_COLOR
)
3165 return alloc_temporary(v
->bld
, 4, v
->outputs
,
3166 MAX2(key
->nr_color_regions
, 1));
3168 else if (l
== FRAG_RESULT_DEPTH
)
3169 return alloc_temporary(v
->bld
, 1, &v
->frag_depth
, 1);
3171 else if (l
== FRAG_RESULT_STENCIL
)
3172 return alloc_temporary(v
->bld
, 1, &v
->frag_stencil
, 1);
3174 else if (l
== FRAG_RESULT_SAMPLE_MASK
)
3175 return alloc_temporary(v
->bld
, 1, &v
->sample_mask
, 1);
3177 else if (l
>= FRAG_RESULT_DATA0
&&
3178 l
< FRAG_RESULT_DATA0
+ BRW_MAX_DRAW_BUFFERS
)
3179 return alloc_temporary(v
->bld
, 4,
3180 &v
->outputs
[l
- FRAG_RESULT_DATA0
], 1);
3183 unreachable("Invalid location");
3187 fs_visitor::nir_emit_fs_intrinsic(const fs_builder
&bld
,
3188 nir_intrinsic_instr
*instr
)
3190 assert(stage
== MESA_SHADER_FRAGMENT
);
3193 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
3194 dest
= get_nir_dest(instr
->dest
);
3196 switch (instr
->intrinsic
) {
3197 case nir_intrinsic_load_front_face
:
3198 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
),
3199 *emit_frontfacing_interpolation());
3202 case nir_intrinsic_load_sample_pos
: {
3203 fs_reg sample_pos
= nir_system_values
[SYSTEM_VALUE_SAMPLE_POS
];
3204 assert(sample_pos
.file
!= BAD_FILE
);
3205 dest
.type
= sample_pos
.type
;
3206 bld
.MOV(dest
, sample_pos
);
3207 bld
.MOV(offset(dest
, bld
, 1), offset(sample_pos
, bld
, 1));
3211 case nir_intrinsic_load_layer_id
:
3212 dest
.type
= BRW_REGISTER_TYPE_UD
;
3213 bld
.MOV(dest
, fetch_render_target_array_index(bld
));
3216 case nir_intrinsic_load_helper_invocation
:
3217 case nir_intrinsic_load_sample_mask_in
:
3218 case nir_intrinsic_load_sample_id
: {
3219 gl_system_value sv
= nir_system_value_from_intrinsic(instr
->intrinsic
);
3220 fs_reg val
= nir_system_values
[sv
];
3221 assert(val
.file
!= BAD_FILE
);
3222 dest
.type
= val
.type
;
3227 case nir_intrinsic_store_output
: {
3228 const fs_reg src
= get_nir_src(instr
->src
[0]);
3229 const nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[1]);
3230 assert(const_offset
&& "Indirect output stores not allowed");
3231 const unsigned location
= nir_intrinsic_base(instr
) +
3232 SET_FIELD(const_offset
->u32
[0], BRW_NIR_FRAG_OUTPUT_LOCATION
);
3233 const fs_reg new_dest
= retype(alloc_frag_output(this, location
),
3236 for (unsigned j
= 0; j
< instr
->num_components
; j
++)
3237 bld
.MOV(offset(new_dest
, bld
, nir_intrinsic_component(instr
) + j
),
3238 offset(src
, bld
, j
));
3243 case nir_intrinsic_load_output
: {
3244 const unsigned l
= GET_FIELD(nir_intrinsic_base(instr
),
3245 BRW_NIR_FRAG_OUTPUT_LOCATION
);
3246 assert(l
>= FRAG_RESULT_DATA0
);
3247 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
3248 assert(const_offset
&& "Indirect output loads not allowed");
3249 const unsigned target
= l
- FRAG_RESULT_DATA0
+ const_offset
->u32
[0];
3250 const fs_reg tmp
= bld
.vgrf(dest
.type
, 4);
3252 if (reinterpret_cast<const brw_wm_prog_key
*>(key
)->coherent_fb_fetch
)
3253 emit_coherent_fb_read(bld
, tmp
, target
);
3255 emit_non_coherent_fb_read(bld
, tmp
, target
);
3257 for (unsigned j
= 0; j
< instr
->num_components
; j
++) {
3258 bld
.MOV(offset(dest
, bld
, j
),
3259 offset(tmp
, bld
, nir_intrinsic_component(instr
) + j
));
3265 case nir_intrinsic_discard
:
3266 case nir_intrinsic_discard_if
: {
3267 /* We track our discarded pixels in f0.1. By predicating on it, we can
3268 * update just the flag bits that aren't yet discarded. If there's no
3269 * condition, we emit a CMP of g0 != g0, so all currently executing
3270 * channels will get turned off.
3273 if (instr
->intrinsic
== nir_intrinsic_discard_if
) {
3274 cmp
= bld
.CMP(bld
.null_reg_f(), get_nir_src(instr
->src
[0]),
3275 brw_imm_d(0), BRW_CONDITIONAL_Z
);
3277 fs_reg some_reg
= fs_reg(retype(brw_vec8_grf(0, 0),
3278 BRW_REGISTER_TYPE_UW
));
3279 cmp
= bld
.CMP(bld
.null_reg_f(), some_reg
, some_reg
, BRW_CONDITIONAL_NZ
);
3281 cmp
->predicate
= BRW_PREDICATE_NORMAL
;
3282 cmp
->flag_subreg
= 1;
3284 if (devinfo
->gen
>= 6) {
3285 emit_discard_jump();
3290 case nir_intrinsic_load_input
: {
3291 /* load_input is only used for flat inputs */
3292 unsigned base
= nir_intrinsic_base(instr
);
3293 unsigned component
= nir_intrinsic_component(instr
);
3294 unsigned num_components
= instr
->num_components
;
3295 enum brw_reg_type type
= dest
.type
;
3297 /* Special case fields in the VUE header */
3298 if (base
== VARYING_SLOT_LAYER
)
3300 else if (base
== VARYING_SLOT_VIEWPORT
)
3303 if (nir_dest_bit_size(instr
->dest
) == 64) {
3304 /* const_index is in 32-bit type size units that could not be aligned
3305 * with DF. We need to read the double vector as if it was a float
3306 * vector of twice the number of components to fetch the right data.
3308 type
= BRW_REGISTER_TYPE_F
;
3309 num_components
*= 2;
3312 for (unsigned int i
= 0; i
< num_components
; i
++) {
3313 struct brw_reg interp
= interp_reg(base
, component
+ i
);
3314 interp
= suboffset(interp
, 3);
3315 bld
.emit(FS_OPCODE_CINTERP
, offset(retype(dest
, type
), bld
, i
),
3316 retype(fs_reg(interp
), type
));
3319 if (nir_dest_bit_size(instr
->dest
) == 64) {
3320 shuffle_32bit_load_result_to_64bit_data(bld
,
3323 instr
->num_components
);
3328 case nir_intrinsic_load_barycentric_pixel
:
3329 case nir_intrinsic_load_barycentric_centroid
:
3330 case nir_intrinsic_load_barycentric_sample
:
3331 /* Do nothing - load_interpolated_input handling will handle it later. */
3334 case nir_intrinsic_load_barycentric_at_sample
: {
3335 const glsl_interp_mode interpolation
=
3336 (enum glsl_interp_mode
) nir_intrinsic_interp_mode(instr
);
3338 nir_const_value
*const_sample
= nir_src_as_const_value(instr
->src
[0]);
3341 unsigned msg_data
= const_sample
->i32
[0] << 4;
3343 emit_pixel_interpolater_send(bld
,
3344 FS_OPCODE_INTERPOLATE_AT_SAMPLE
,
3347 brw_imm_ud(msg_data
),
3350 const fs_reg sample_src
= retype(get_nir_src(instr
->src
[0]),
3351 BRW_REGISTER_TYPE_UD
);
3353 if (nir_src_is_dynamically_uniform(instr
->src
[0])) {
3354 const fs_reg sample_id
= bld
.emit_uniformize(sample_src
);
3355 const fs_reg msg_data
= vgrf(glsl_type::uint_type
);
3356 bld
.exec_all().group(1, 0)
3357 .SHL(msg_data
, sample_id
, brw_imm_ud(4u));
3358 emit_pixel_interpolater_send(bld
,
3359 FS_OPCODE_INTERPOLATE_AT_SAMPLE
,
3365 /* Make a loop that sends a message to the pixel interpolater
3366 * for the sample number in each live channel. If there are
3367 * multiple channels with the same sample number then these
3368 * will be handled simultaneously with a single interation of
3371 bld
.emit(BRW_OPCODE_DO
);
3373 /* Get the next live sample number into sample_id_reg */
3374 const fs_reg sample_id
= bld
.emit_uniformize(sample_src
);
3376 /* Set the flag register so that we can perform the send
3377 * message on all channels that have the same sample number
3379 bld
.CMP(bld
.null_reg_ud(),
3380 sample_src
, sample_id
,
3381 BRW_CONDITIONAL_EQ
);
3382 const fs_reg msg_data
= vgrf(glsl_type::uint_type
);
3383 bld
.exec_all().group(1, 0)
3384 .SHL(msg_data
, sample_id
, brw_imm_ud(4u));
3386 emit_pixel_interpolater_send(bld
,
3387 FS_OPCODE_INTERPOLATE_AT_SAMPLE
,
3392 set_predicate(BRW_PREDICATE_NORMAL
, inst
);
3394 /* Continue the loop if there are any live channels left */
3395 set_predicate_inv(BRW_PREDICATE_NORMAL
,
3397 bld
.emit(BRW_OPCODE_WHILE
));
3403 case nir_intrinsic_load_barycentric_at_offset
: {
3404 const glsl_interp_mode interpolation
=
3405 (enum glsl_interp_mode
) nir_intrinsic_interp_mode(instr
);
3407 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
3410 unsigned off_x
= MIN2((int)(const_offset
->f32
[0] * 16), 7) & 0xf;
3411 unsigned off_y
= MIN2((int)(const_offset
->f32
[1] * 16), 7) & 0xf;
3413 emit_pixel_interpolater_send(bld
,
3414 FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET
,
3417 brw_imm_ud(off_x
| (off_y
<< 4)),
3420 fs_reg src
= vgrf(glsl_type::ivec2_type
);
3421 fs_reg offset_src
= retype(get_nir_src(instr
->src
[0]),
3422 BRW_REGISTER_TYPE_F
);
3423 for (int i
= 0; i
< 2; i
++) {
3424 fs_reg temp
= vgrf(glsl_type::float_type
);
3425 bld
.MUL(temp
, offset(offset_src
, bld
, i
), brw_imm_f(16.0f
));
3426 fs_reg itemp
= vgrf(glsl_type::int_type
);
3428 bld
.MOV(itemp
, temp
);
3430 /* Clamp the upper end of the range to +7/16.
3431 * ARB_gpu_shader5 requires that we support a maximum offset
3432 * of +0.5, which isn't representable in a S0.4 value -- if
3433 * we didn't clamp it, we'd end up with -8/16, which is the
3434 * opposite of what the shader author wanted.
3436 * This is legal due to ARB_gpu_shader5's quantization
3439 * "Not all values of <offset> may be supported; x and y
3440 * offsets may be rounded to fixed-point values with the
3441 * number of fraction bits given by the
3442 * implementation-dependent constant
3443 * FRAGMENT_INTERPOLATION_OFFSET_BITS"
3445 set_condmod(BRW_CONDITIONAL_L
,
3446 bld
.SEL(offset(src
, bld
, i
), itemp
, brw_imm_d(7)));
3449 const enum opcode opcode
= FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET
;
3450 emit_pixel_interpolater_send(bld
,
3460 case nir_intrinsic_load_interpolated_input
: {
3461 if (nir_intrinsic_base(instr
) == VARYING_SLOT_POS
) {
3462 emit_fragcoord_interpolation(dest
);
3466 assert(instr
->src
[0].ssa
&&
3467 instr
->src
[0].ssa
->parent_instr
->type
== nir_instr_type_intrinsic
);
3468 nir_intrinsic_instr
*bary_intrinsic
=
3469 nir_instr_as_intrinsic(instr
->src
[0].ssa
->parent_instr
);
3470 nir_intrinsic_op bary_intrin
= bary_intrinsic
->intrinsic
;
3471 enum glsl_interp_mode interp_mode
=
3472 (enum glsl_interp_mode
) nir_intrinsic_interp_mode(bary_intrinsic
);
3475 if (bary_intrin
== nir_intrinsic_load_barycentric_at_offset
||
3476 bary_intrin
== nir_intrinsic_load_barycentric_at_sample
) {
3477 /* Use the result of the PI message */
3478 dst_xy
= retype(get_nir_src(instr
->src
[0]), BRW_REGISTER_TYPE_F
);
3480 /* Use the delta_xy values computed from the payload */
3481 enum brw_barycentric_mode bary
=
3482 brw_barycentric_mode(interp_mode
, bary_intrin
);
3484 dst_xy
= this->delta_xy
[bary
];
3487 for (unsigned int i
= 0; i
< instr
->num_components
; i
++) {
3489 fs_reg(interp_reg(nir_intrinsic_base(instr
),
3490 nir_intrinsic_component(instr
) + i
));
3491 interp
.type
= BRW_REGISTER_TYPE_F
;
3492 dest
.type
= BRW_REGISTER_TYPE_F
;
3494 if (devinfo
->gen
< 6 && interp_mode
== INTERP_MODE_SMOOTH
) {
3495 fs_reg tmp
= vgrf(glsl_type::float_type
);
3496 bld
.emit(FS_OPCODE_LINTERP
, tmp
, dst_xy
, interp
);
3497 bld
.MUL(offset(dest
, bld
, i
), tmp
, this->pixel_w
);
3499 bld
.emit(FS_OPCODE_LINTERP
, offset(dest
, bld
, i
), dst_xy
, interp
);
3506 nir_emit_intrinsic(bld
, instr
);
3512 fs_visitor::nir_emit_cs_intrinsic(const fs_builder
&bld
,
3513 nir_intrinsic_instr
*instr
)
3515 assert(stage
== MESA_SHADER_COMPUTE
);
3516 struct brw_cs_prog_data
*cs_prog_data
= brw_cs_prog_data(prog_data
);
3519 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
3520 dest
= get_nir_dest(instr
->dest
);
3522 switch (instr
->intrinsic
) {
3523 case nir_intrinsic_barrier
:
3525 cs_prog_data
->uses_barrier
= true;
3528 case nir_intrinsic_load_subgroup_id
:
3529 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_UD
), subgroup_id
);
3532 case nir_intrinsic_load_local_invocation_id
:
3533 case nir_intrinsic_load_work_group_id
: {
3534 gl_system_value sv
= nir_system_value_from_intrinsic(instr
->intrinsic
);
3535 fs_reg val
= nir_system_values
[sv
];
3536 assert(val
.file
!= BAD_FILE
);
3537 dest
.type
= val
.type
;
3538 for (unsigned i
= 0; i
< 3; i
++)
3539 bld
.MOV(offset(dest
, bld
, i
), offset(val
, bld
, i
));
3543 case nir_intrinsic_load_num_work_groups
: {
3544 const unsigned surface
=
3545 cs_prog_data
->binding_table
.work_groups_start
;
3547 cs_prog_data
->uses_num_work_groups
= true;
3549 fs_reg surf_index
= brw_imm_ud(surface
);
3550 brw_mark_surface_used(prog_data
, surface
);
3552 /* Read the 3 GLuint components of gl_NumWorkGroups */
3553 for (unsigned i
= 0; i
< 3; i
++) {
3554 fs_reg read_result
=
3555 emit_untyped_read(bld
, surf_index
,
3557 1 /* dims */, 1 /* size */,
3558 BRW_PREDICATE_NONE
);
3559 read_result
.type
= dest
.type
;
3560 bld
.MOV(dest
, read_result
);
3561 dest
= offset(dest
, bld
, 1);
3566 case nir_intrinsic_shared_atomic_add
:
3567 nir_emit_shared_atomic(bld
, BRW_AOP_ADD
, instr
);
3569 case nir_intrinsic_shared_atomic_imin
:
3570 nir_emit_shared_atomic(bld
, BRW_AOP_IMIN
, instr
);
3572 case nir_intrinsic_shared_atomic_umin
:
3573 nir_emit_shared_atomic(bld
, BRW_AOP_UMIN
, instr
);
3575 case nir_intrinsic_shared_atomic_imax
:
3576 nir_emit_shared_atomic(bld
, BRW_AOP_IMAX
, instr
);
3578 case nir_intrinsic_shared_atomic_umax
:
3579 nir_emit_shared_atomic(bld
, BRW_AOP_UMAX
, instr
);
3581 case nir_intrinsic_shared_atomic_and
:
3582 nir_emit_shared_atomic(bld
, BRW_AOP_AND
, instr
);
3584 case nir_intrinsic_shared_atomic_or
:
3585 nir_emit_shared_atomic(bld
, BRW_AOP_OR
, instr
);
3587 case nir_intrinsic_shared_atomic_xor
:
3588 nir_emit_shared_atomic(bld
, BRW_AOP_XOR
, instr
);
3590 case nir_intrinsic_shared_atomic_exchange
:
3591 nir_emit_shared_atomic(bld
, BRW_AOP_MOV
, instr
);
3593 case nir_intrinsic_shared_atomic_comp_swap
:
3594 nir_emit_shared_atomic(bld
, BRW_AOP_CMPWR
, instr
);
3597 case nir_intrinsic_load_shared
: {
3598 assert(devinfo
->gen
>= 7);
3600 fs_reg surf_index
= brw_imm_ud(GEN7_BTI_SLM
);
3602 /* Get the offset to read from */
3604 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
3606 offset_reg
= brw_imm_ud(instr
->const_index
[0] + const_offset
->u32
[0]);
3608 offset_reg
= vgrf(glsl_type::uint_type
);
3610 retype(get_nir_src(instr
->src
[0]), BRW_REGISTER_TYPE_UD
),
3611 brw_imm_ud(instr
->const_index
[0]));
3614 /* Read the vector */
3615 do_untyped_vector_read(bld
, dest
, surf_index
, offset_reg
,
3616 instr
->num_components
);
3620 case nir_intrinsic_store_shared
: {
3621 assert(devinfo
->gen
>= 7);
3624 fs_reg surf_index
= brw_imm_ud(GEN7_BTI_SLM
);
3627 fs_reg val_reg
= get_nir_src(instr
->src
[0]);
3630 unsigned writemask
= instr
->const_index
[1];
3632 /* get_nir_src() retypes to integer. Be wary of 64-bit types though
3633 * since the untyped writes below operate in units of 32-bits, which
3634 * means that we need to write twice as many components each time.
3635 * Also, we have to suffle 64-bit data to be in the appropriate layout
3636 * expected by our 32-bit write messages.
3638 unsigned type_size
= 4;
3639 if (nir_src_bit_size(instr
->src
[0]) == 64) {
3641 val_reg
= shuffle_64bit_data_for_32bit_write(bld
,
3642 val_reg
, instr
->num_components
);
3645 unsigned type_slots
= type_size
/ 4;
3647 /* Combine groups of consecutive enabled channels in one write
3648 * message. We use ffs to find the first enabled channel and then ffs on
3649 * the bit-inverse, down-shifted writemask to determine the length of
3650 * the block of enabled bits.
3653 unsigned first_component
= ffs(writemask
) - 1;
3654 unsigned length
= ffs(~(writemask
>> first_component
)) - 1;
3656 /* We can't write more than 2 64-bit components at once. Limit the
3657 * length of the write to what we can do and let the next iteration
3661 length
= MIN2(2, length
);
3664 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[1]);
3666 offset_reg
= brw_imm_ud(instr
->const_index
[0] + const_offset
->u32
[0] +
3667 type_size
* first_component
);
3669 offset_reg
= vgrf(glsl_type::uint_type
);
3671 retype(get_nir_src(instr
->src
[1]), BRW_REGISTER_TYPE_UD
),
3672 brw_imm_ud(instr
->const_index
[0] + type_size
* first_component
));
3675 emit_untyped_write(bld
, surf_index
, offset_reg
,
3676 offset(val_reg
, bld
, first_component
* type_slots
),
3677 1 /* dims */, length
* type_slots
,
3678 BRW_PREDICATE_NONE
);
3680 /* Clear the bits in the writemask that we just wrote, then try
3681 * again to see if more channels are left.
3683 writemask
&= (15 << (first_component
+ length
));
3690 nir_emit_intrinsic(bld
, instr
);
3696 fs_visitor::nir_emit_intrinsic(const fs_builder
&bld
, nir_intrinsic_instr
*instr
)
3699 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
3700 dest
= get_nir_dest(instr
->dest
);
3702 switch (instr
->intrinsic
) {
3703 case nir_intrinsic_image_load
:
3704 case nir_intrinsic_image_store
:
3705 case nir_intrinsic_image_atomic_add
:
3706 case nir_intrinsic_image_atomic_min
:
3707 case nir_intrinsic_image_atomic_max
:
3708 case nir_intrinsic_image_atomic_and
:
3709 case nir_intrinsic_image_atomic_or
:
3710 case nir_intrinsic_image_atomic_xor
:
3711 case nir_intrinsic_image_atomic_exchange
:
3712 case nir_intrinsic_image_atomic_comp_swap
: {
3713 using namespace image_access
;
3715 if (stage
== MESA_SHADER_FRAGMENT
&&
3716 instr
->intrinsic
!= nir_intrinsic_image_load
)
3717 brw_wm_prog_data(prog_data
)->has_side_effects
= true;
3719 /* Get the referenced image variable and type. */
3720 const nir_variable
*var
= instr
->variables
[0]->var
;
3721 const glsl_type
*type
= var
->type
->without_array();
3722 const brw_reg_type base_type
= get_image_base_type(type
);
3724 /* Get some metadata from the image intrinsic. */
3725 const nir_intrinsic_info
*info
= &nir_intrinsic_infos
[instr
->intrinsic
];
3726 const unsigned arr_dims
= type
->sampler_array
? 1 : 0;
3727 const unsigned surf_dims
= type
->coordinate_components() - arr_dims
;
3728 const unsigned format
= var
->data
.image
.format
;
3730 /* Get the arguments of the image intrinsic. */
3731 const fs_reg image
= get_nir_image_deref(instr
->variables
[0]);
3732 const fs_reg addr
= retype(get_nir_src(instr
->src
[0]),
3733 BRW_REGISTER_TYPE_UD
);
3734 const fs_reg src0
= (info
->num_srcs
>= 3 ?
3735 retype(get_nir_src(instr
->src
[2]), base_type
) :
3737 const fs_reg src1
= (info
->num_srcs
>= 4 ?
3738 retype(get_nir_src(instr
->src
[3]), base_type
) :
3742 /* Emit an image load, store or atomic op. */
3743 if (instr
->intrinsic
== nir_intrinsic_image_load
)
3744 tmp
= emit_image_load(bld
, image
, addr
, surf_dims
, arr_dims
, format
);
3746 else if (instr
->intrinsic
== nir_intrinsic_image_store
)
3747 emit_image_store(bld
, image
, addr
, src0
, surf_dims
, arr_dims
,
3748 var
->data
.image
.write_only
? GL_NONE
: format
);
3751 tmp
= emit_image_atomic(bld
, image
, addr
, src0
, src1
,
3752 surf_dims
, arr_dims
, info
->dest_components
,
3753 get_image_atomic_op(instr
->intrinsic
, type
));
3755 /* Assign the result. */
3756 for (unsigned c
= 0; c
< info
->dest_components
; ++c
)
3757 bld
.MOV(offset(retype(dest
, base_type
), bld
, c
),
3758 offset(tmp
, bld
, c
));
3762 case nir_intrinsic_memory_barrier_atomic_counter
:
3763 case nir_intrinsic_memory_barrier_buffer
:
3764 case nir_intrinsic_memory_barrier_image
:
3765 case nir_intrinsic_memory_barrier
: {
3766 const fs_builder ubld
= bld
.group(8, 0);
3767 const fs_reg tmp
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
3768 ubld
.emit(SHADER_OPCODE_MEMORY_FENCE
, tmp
)
3769 ->size_written
= 2 * REG_SIZE
;
3773 case nir_intrinsic_group_memory_barrier
:
3774 case nir_intrinsic_memory_barrier_shared
:
3775 /* We treat these workgroup-level barriers as no-ops. This should be
3776 * safe at present and as long as:
3778 * - Memory access instructions are not subsequently reordered by the
3779 * compiler back-end.
3781 * - All threads from a given compute shader workgroup fit within a
3782 * single subslice and therefore talk to the same HDC shared unit
3783 * what supposedly guarantees ordering and coherency between threads
3784 * from the same workgroup. This may change in the future when we
3785 * start splitting workgroups across multiple subslices.
3787 * - The context is not in fault-and-stream mode, which could cause
3788 * memory transactions (including to SLM) prior to the barrier to be
3789 * replayed after the barrier if a pagefault occurs. This shouldn't
3790 * be a problem up to and including SKL because fault-and-stream is
3791 * not usable due to hardware issues, but that's likely to change in
3796 case nir_intrinsic_shader_clock
: {
3797 /* We cannot do anything if there is an event, so ignore it for now */
3798 const fs_reg shader_clock
= get_timestamp(bld
);
3799 const fs_reg srcs
[] = { component(shader_clock
, 0),
3800 component(shader_clock
, 1) };
3801 bld
.LOAD_PAYLOAD(dest
, srcs
, ARRAY_SIZE(srcs
), 0);
3805 case nir_intrinsic_image_size
: {
3806 /* Get the referenced image variable and type. */
3807 const nir_variable
*var
= instr
->variables
[0]->var
;
3808 const glsl_type
*type
= var
->type
->without_array();
3810 /* Get the size of the image. */
3811 const fs_reg image
= get_nir_image_deref(instr
->variables
[0]);
3812 const fs_reg size
= offset(image
, bld
, BRW_IMAGE_PARAM_SIZE_OFFSET
);
3814 /* For 1DArray image types, the array index is stored in the Z component.
3815 * Fix this by swizzling the Z component to the Y component.
3817 const bool is_1d_array_image
=
3818 type
->sampler_dimensionality
== GLSL_SAMPLER_DIM_1D
&&
3819 type
->sampler_array
;
3821 /* For CubeArray images, we should count the number of cubes instead
3822 * of the number of faces. Fix it by dividing the (Z component) by 6.
3824 const bool is_cube_array_image
=
3825 type
->sampler_dimensionality
== GLSL_SAMPLER_DIM_CUBE
&&
3826 type
->sampler_array
;
3828 /* Copy all the components. */
3829 for (unsigned c
= 0; c
< instr
->dest
.ssa
.num_components
; ++c
) {
3830 if ((int)c
>= type
->coordinate_components()) {
3831 bld
.MOV(offset(retype(dest
, BRW_REGISTER_TYPE_D
), bld
, c
),
3833 } else if (c
== 1 && is_1d_array_image
) {
3834 bld
.MOV(offset(retype(dest
, BRW_REGISTER_TYPE_D
), bld
, c
),
3835 offset(size
, bld
, 2));
3836 } else if (c
== 2 && is_cube_array_image
) {
3837 bld
.emit(SHADER_OPCODE_INT_QUOTIENT
,
3838 offset(retype(dest
, BRW_REGISTER_TYPE_D
), bld
, c
),
3839 offset(size
, bld
, c
), brw_imm_d(6));
3841 bld
.MOV(offset(retype(dest
, BRW_REGISTER_TYPE_D
), bld
, c
),
3842 offset(size
, bld
, c
));
3849 case nir_intrinsic_image_samples
:
3850 /* The driver does not support multi-sampled images. */
3851 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
), brw_imm_d(1));
3854 case nir_intrinsic_load_uniform
: {
3855 /* Offsets are in bytes but they should always be multiples of 4 */
3856 assert(instr
->const_index
[0] % 4 == 0);
3858 fs_reg
src(UNIFORM
, instr
->const_index
[0] / 4, dest
.type
);
3860 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
3862 /* Offsets are in bytes but they should always be multiples of 4 */
3863 assert(const_offset
->u32
[0] % 4 == 0);
3864 src
.offset
= const_offset
->u32
[0];
3866 for (unsigned j
= 0; j
< instr
->num_components
; j
++) {
3867 bld
.MOV(offset(dest
, bld
, j
), offset(src
, bld
, j
));
3870 fs_reg indirect
= retype(get_nir_src(instr
->src
[0]),
3871 BRW_REGISTER_TYPE_UD
);
3873 /* We need to pass a size to the MOV_INDIRECT but we don't want it to
3874 * go past the end of the uniform. In order to keep the n'th
3875 * component from running past, we subtract off the size of all but
3876 * one component of the vector.
3878 assert(instr
->const_index
[1] >=
3879 instr
->num_components
* (int) type_sz(dest
.type
));
3880 unsigned read_size
= instr
->const_index
[1] -
3881 (instr
->num_components
- 1) * type_sz(dest
.type
);
3883 bool supports_64bit_indirects
=
3884 !devinfo
->is_cherryview
&& !gen_device_info_is_9lp(devinfo
);
3886 if (type_sz(dest
.type
) != 8 || supports_64bit_indirects
) {
3887 for (unsigned j
= 0; j
< instr
->num_components
; j
++) {
3888 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
,
3889 offset(dest
, bld
, j
), offset(src
, bld
, j
),
3890 indirect
, brw_imm_ud(read_size
));
3893 const unsigned num_mov_indirects
=
3894 type_sz(dest
.type
) / type_sz(BRW_REGISTER_TYPE_UD
);
3895 /* We read a little bit less per MOV INDIRECT, as they are now
3896 * 32-bits ones instead of 64-bit. Fix read_size then.
3898 const unsigned read_size_32bit
= read_size
-
3899 (num_mov_indirects
- 1) * type_sz(BRW_REGISTER_TYPE_UD
);
3900 for (unsigned j
= 0; j
< instr
->num_components
; j
++) {
3901 for (unsigned i
= 0; i
< num_mov_indirects
; i
++) {
3902 bld
.emit(SHADER_OPCODE_MOV_INDIRECT
,
3903 subscript(offset(dest
, bld
, j
), BRW_REGISTER_TYPE_UD
, i
),
3904 subscript(offset(src
, bld
, j
), BRW_REGISTER_TYPE_UD
, i
),
3905 indirect
, brw_imm_ud(read_size_32bit
));
3913 case nir_intrinsic_load_ubo
: {
3914 nir_const_value
*const_index
= nir_src_as_const_value(instr
->src
[0]);
3918 const unsigned index
= stage_prog_data
->binding_table
.ubo_start
+
3919 const_index
->u32
[0];
3920 surf_index
= brw_imm_ud(index
);
3921 brw_mark_surface_used(prog_data
, index
);
3923 /* The block index is not a constant. Evaluate the index expression
3924 * per-channel and add the base UBO index; we have to select a value
3925 * from any live channel.
3927 surf_index
= vgrf(glsl_type::uint_type
);
3928 bld
.ADD(surf_index
, get_nir_src(instr
->src
[0]),
3929 brw_imm_ud(stage_prog_data
->binding_table
.ubo_start
));
3930 surf_index
= bld
.emit_uniformize(surf_index
);
3932 /* Assume this may touch any UBO. It would be nice to provide
3933 * a tighter bound, but the array information is already lowered away.
3935 brw_mark_surface_used(prog_data
,
3936 stage_prog_data
->binding_table
.ubo_start
+
3937 nir
->info
.num_ubos
- 1);
3940 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[1]);
3941 if (const_offset
== NULL
) {
3942 fs_reg base_offset
= retype(get_nir_src(instr
->src
[1]),
3943 BRW_REGISTER_TYPE_UD
);
3945 for (int i
= 0; i
< instr
->num_components
; i
++)
3946 VARYING_PULL_CONSTANT_LOAD(bld
, offset(dest
, bld
, i
), surf_index
,
3947 base_offset
, i
* type_sz(dest
.type
));
3949 /* Even if we are loading doubles, a pull constant load will load
3950 * a 32-bit vec4, so should only reserve vgrf space for that. If we
3951 * need to load a full dvec4 we will have to emit 2 loads. This is
3952 * similar to demote_pull_constants(), except that in that case we
3953 * see individual accesses to each component of the vector and then
3954 * we let CSE deal with duplicate loads. Here we see a vector access
3955 * and we have to split it if necessary.
3957 const unsigned type_size
= type_sz(dest
.type
);
3959 /* See if we've selected this as a push constant candidate */
3961 const unsigned ubo_block
= const_index
->u32
[0];
3962 const unsigned offset_256b
= const_offset
->u32
[0] / 32;
3965 for (int i
= 0; i
< 4; i
++) {
3966 const struct brw_ubo_range
*range
= &prog_data
->ubo_ranges
[i
];
3967 if (range
->block
== ubo_block
&&
3968 offset_256b
>= range
->start
&&
3969 offset_256b
< range
->start
+ range
->length
) {
3971 push_reg
= fs_reg(UNIFORM
, UBO_START
+ i
, dest
.type
);
3972 push_reg
.offset
= const_offset
->u32
[0] - 32 * range
->start
;
3977 if (push_reg
.file
!= BAD_FILE
) {
3978 for (unsigned i
= 0; i
< instr
->num_components
; i
++) {
3979 bld
.MOV(offset(dest
, bld
, i
),
3980 byte_offset(push_reg
, i
* type_size
));
3986 const unsigned block_sz
= 64; /* Fetch one cacheline at a time. */
3987 const fs_builder ubld
= bld
.exec_all().group(block_sz
/ 4, 0);
3988 const fs_reg packed_consts
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
3990 for (unsigned c
= 0; c
< instr
->num_components
;) {
3991 const unsigned base
= const_offset
->u32
[0] + c
* type_size
;
3992 /* Number of usable components in the next block-aligned load. */
3993 const unsigned count
= MIN2(instr
->num_components
- c
,
3994 (block_sz
- base
% block_sz
) / type_size
);
3996 ubld
.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
,
3997 packed_consts
, surf_index
,
3998 brw_imm_ud(base
& ~(block_sz
- 1)));
4000 const fs_reg consts
=
4001 retype(byte_offset(packed_consts
, base
& (block_sz
- 1)),
4004 for (unsigned d
= 0; d
< count
; d
++)
4005 bld
.MOV(offset(dest
, bld
, c
+ d
), component(consts
, d
));
4013 case nir_intrinsic_load_ssbo
: {
4014 assert(devinfo
->gen
>= 7);
4016 nir_const_value
*const_uniform_block
=
4017 nir_src_as_const_value(instr
->src
[0]);
4020 if (const_uniform_block
) {
4021 unsigned index
= stage_prog_data
->binding_table
.ssbo_start
+
4022 const_uniform_block
->u32
[0];
4023 surf_index
= brw_imm_ud(index
);
4024 brw_mark_surface_used(prog_data
, index
);
4026 surf_index
= vgrf(glsl_type::uint_type
);
4027 bld
.ADD(surf_index
, get_nir_src(instr
->src
[0]),
4028 brw_imm_ud(stage_prog_data
->binding_table
.ssbo_start
));
4030 /* Assume this may touch any UBO. It would be nice to provide
4031 * a tighter bound, but the array information is already lowered away.
4033 brw_mark_surface_used(prog_data
,
4034 stage_prog_data
->binding_table
.ssbo_start
+
4035 nir
->info
.num_ssbos
- 1);
4039 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[1]);
4041 offset_reg
= brw_imm_ud(const_offset
->u32
[0]);
4043 offset_reg
= get_nir_src(instr
->src
[1]);
4046 /* Read the vector */
4047 do_untyped_vector_read(bld
, dest
, surf_index
, offset_reg
,
4048 instr
->num_components
);
4053 case nir_intrinsic_store_ssbo
: {
4054 assert(devinfo
->gen
>= 7);
4056 if (stage
== MESA_SHADER_FRAGMENT
)
4057 brw_wm_prog_data(prog_data
)->has_side_effects
= true;
4061 nir_const_value
*const_uniform_block
=
4062 nir_src_as_const_value(instr
->src
[1]);
4063 if (const_uniform_block
) {
4064 unsigned index
= stage_prog_data
->binding_table
.ssbo_start
+
4065 const_uniform_block
->u32
[0];
4066 surf_index
= brw_imm_ud(index
);
4067 brw_mark_surface_used(prog_data
, index
);
4069 surf_index
= vgrf(glsl_type::uint_type
);
4070 bld
.ADD(surf_index
, get_nir_src(instr
->src
[1]),
4071 brw_imm_ud(stage_prog_data
->binding_table
.ssbo_start
));
4073 brw_mark_surface_used(prog_data
,
4074 stage_prog_data
->binding_table
.ssbo_start
+
4075 nir
->info
.num_ssbos
- 1);
4079 fs_reg val_reg
= get_nir_src(instr
->src
[0]);
4082 unsigned writemask
= instr
->const_index
[0];
4084 /* get_nir_src() retypes to integer. Be wary of 64-bit types though
4085 * since the untyped writes below operate in units of 32-bits, which
4086 * means that we need to write twice as many components each time.
4087 * Also, we have to suffle 64-bit data to be in the appropriate layout
4088 * expected by our 32-bit write messages.
4090 unsigned bit_size
= nir_src_bit_size(instr
->src
[0]);
4091 unsigned type_size
= bit_size
/ 8;
4092 if (bit_size
== 64) {
4093 val_reg
= shuffle_64bit_data_for_32bit_write(bld
,
4094 val_reg
, instr
->num_components
);
4097 /* Combine groups of consecutive enabled channels in one write
4098 * message. We use ffs to find the first enabled channel and then ffs on
4099 * the bit-inverse, down-shifted writemask to determine the num_components
4100 * of the block of enabled bits.
4103 unsigned first_component
= ffs(writemask
) - 1;
4104 unsigned num_components
= ffs(~(writemask
>> first_component
)) - 1;
4106 if (type_size
> 4) {
4107 /* We can't write more than 2 64-bit components at once. Limit
4108 * the num_components of the write to what we can do and let the next
4109 * iteration handle the rest.
4111 num_components
= MIN2(2, num_components
);
4112 } else if (type_size
< 4) {
4113 /* For 16-bit types we are using byte scattered writes, that can
4114 * only write one component per call. So we limit the num_components,
4115 * and let the write happening in several iterations.
4121 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[2]);
4123 offset_reg
= brw_imm_ud(const_offset
->u32
[0] +
4124 type_size
* first_component
);
4126 offset_reg
= vgrf(glsl_type::uint_type
);
4128 retype(get_nir_src(instr
->src
[2]), BRW_REGISTER_TYPE_UD
),
4129 brw_imm_ud(type_size
* first_component
));
4132 if (type_size
< 4) {
4133 /* Untyped Surface messages have a fixed 32-bit size, so we need
4134 * to rely on byte scattered in order to write 16-bit elements.
4135 * The byte_scattered_write message needs that every written 16-bit
4136 * type to be aligned 32-bits (stride=2).
4137 * Additionally, while on Untyped Surface messages the
4138 * bits of the execution mask are ANDed with the corresponding
4139 * bits of the Pixel/Sample Mask, that is not the case for byte
4140 * scattered writes. That is needed to avoid ssbo stores writing
4141 * on helper invocations. So when that can affect, we load the
4142 * sample mask, and predicate the send message.
4144 brw_predicate pred
= BRW_PREDICATE_NONE
;
4146 if (stage
== MESA_SHADER_FRAGMENT
) {
4147 bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
4148 pred
= BRW_PREDICATE_NORMAL
;
4151 fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_D
);
4152 bld
.MOV(subscript(tmp
, BRW_REGISTER_TYPE_W
, 0),
4153 offset(val_reg
, bld
, first_component
));
4154 emit_byte_scattered_write(bld
, surf_index
, offset_reg
,
4160 assert(num_components
* type_size
<= 16);
4161 assert((num_components
* type_size
) % 4 == 0);
4162 assert((first_component
* type_size
) % 4 == 0);
4163 unsigned first_slot
= (first_component
* type_size
) / 4;
4164 unsigned num_slots
= (num_components
* type_size
) / 4;
4165 emit_untyped_write(bld
, surf_index
, offset_reg
,
4166 offset(val_reg
, bld
, first_slot
),
4167 1 /* dims */, num_slots
,
4168 BRW_PREDICATE_NONE
);
4171 /* Clear the bits in the writemask that we just wrote, then try
4172 * again to see if more channels are left.
4174 writemask
&= (15 << (first_component
+ num_components
));
4179 case nir_intrinsic_store_output
: {
4180 fs_reg src
= get_nir_src(instr
->src
[0]);
4182 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[1]);
4183 assert(const_offset
&& "Indirect output stores not allowed");
4185 unsigned num_components
= instr
->num_components
;
4186 unsigned first_component
= nir_intrinsic_component(instr
);
4187 if (nir_src_bit_size(instr
->src
[0]) == 64) {
4188 src
= shuffle_64bit_data_for_32bit_write(bld
, src
, num_components
);
4189 num_components
*= 2;
4192 fs_reg new_dest
= retype(offset(outputs
[instr
->const_index
[0]], bld
,
4193 4 * const_offset
->u32
[0]), src
.type
);
4194 for (unsigned j
= 0; j
< num_components
; j
++) {
4195 bld
.MOV(offset(new_dest
, bld
, j
+ first_component
),
4196 offset(src
, bld
, j
));
4201 case nir_intrinsic_ssbo_atomic_add
:
4202 nir_emit_ssbo_atomic(bld
, BRW_AOP_ADD
, instr
);
4204 case nir_intrinsic_ssbo_atomic_imin
:
4205 nir_emit_ssbo_atomic(bld
, BRW_AOP_IMIN
, instr
);
4207 case nir_intrinsic_ssbo_atomic_umin
:
4208 nir_emit_ssbo_atomic(bld
, BRW_AOP_UMIN
, instr
);
4210 case nir_intrinsic_ssbo_atomic_imax
:
4211 nir_emit_ssbo_atomic(bld
, BRW_AOP_IMAX
, instr
);
4213 case nir_intrinsic_ssbo_atomic_umax
:
4214 nir_emit_ssbo_atomic(bld
, BRW_AOP_UMAX
, instr
);
4216 case nir_intrinsic_ssbo_atomic_and
:
4217 nir_emit_ssbo_atomic(bld
, BRW_AOP_AND
, instr
);
4219 case nir_intrinsic_ssbo_atomic_or
:
4220 nir_emit_ssbo_atomic(bld
, BRW_AOP_OR
, instr
);
4222 case nir_intrinsic_ssbo_atomic_xor
:
4223 nir_emit_ssbo_atomic(bld
, BRW_AOP_XOR
, instr
);
4225 case nir_intrinsic_ssbo_atomic_exchange
:
4226 nir_emit_ssbo_atomic(bld
, BRW_AOP_MOV
, instr
);
4228 case nir_intrinsic_ssbo_atomic_comp_swap
:
4229 nir_emit_ssbo_atomic(bld
, BRW_AOP_CMPWR
, instr
);
4232 case nir_intrinsic_get_buffer_size
: {
4233 nir_const_value
*const_uniform_block
= nir_src_as_const_value(instr
->src
[0]);
4234 unsigned ssbo_index
= const_uniform_block
? const_uniform_block
->u32
[0] : 0;
4236 /* A resinfo's sampler message is used to get the buffer size. The
4237 * SIMD8's writeback message consists of four registers and SIMD16's
4238 * writeback message consists of 8 destination registers (two per each
4239 * component). Because we are only interested on the first channel of
4240 * the first returned component, where resinfo returns the buffer size
4241 * for SURFTYPE_BUFFER, we can just use the SIMD8 variant regardless of
4242 * the dispatch width.
4244 const fs_builder ubld
= bld
.exec_all().group(8, 0);
4245 fs_reg src_payload
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
);
4246 fs_reg ret_payload
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
, 4);
4249 ubld
.MOV(src_payload
, brw_imm_d(0));
4251 const unsigned index
= prog_data
->binding_table
.ssbo_start
+ ssbo_index
;
4252 fs_inst
*inst
= ubld
.emit(FS_OPCODE_GET_BUFFER_SIZE
, ret_payload
,
4253 src_payload
, brw_imm_ud(index
));
4254 inst
->header_size
= 0;
4256 inst
->size_written
= 4 * REG_SIZE
;
4258 bld
.MOV(retype(dest
, ret_payload
.type
), component(ret_payload
, 0));
4259 brw_mark_surface_used(prog_data
, index
);
4263 case nir_intrinsic_load_subgroup_invocation
:
4264 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
),
4265 nir_system_values
[SYSTEM_VALUE_SUBGROUP_INVOCATION
]);
4268 case nir_intrinsic_load_subgroup_eq_mask
:
4269 case nir_intrinsic_load_subgroup_ge_mask
:
4270 case nir_intrinsic_load_subgroup_gt_mask
:
4271 case nir_intrinsic_load_subgroup_le_mask
:
4272 case nir_intrinsic_load_subgroup_lt_mask
:
4273 unreachable("not reached");
4275 case nir_intrinsic_vote_any
: {
4276 const fs_builder ubld
= bld
.exec_all().group(1, 0);
4278 /* The any/all predicates do not consider channel enables. To prevent
4279 * dead channels from affecting the result, we initialize the flag with
4280 * with the identity value for the logical operation.
4282 if (dispatch_width
== 32) {
4283 /* For SIMD32, we use a UD type so we fill both f0.0 and f0.1. */
4284 ubld
.MOV(retype(brw_flag_reg(0, 0), BRW_REGISTER_TYPE_UD
),
4287 ubld
.MOV(brw_flag_reg(0, 0), brw_imm_uw(0));
4289 bld
.CMP(bld
.null_reg_d(), get_nir_src(instr
->src
[0]), brw_imm_d(0), BRW_CONDITIONAL_NZ
);
4291 /* For some reason, the any/all predicates don't work properly with
4292 * SIMD32. In particular, it appears that a SEL with a QtrCtrl of 2H
4293 * doesn't read the correct subset of the flag register and you end up
4294 * getting garbage in the second half. Work around this by using a pair
4295 * of 1-wide MOVs and scattering the result.
4297 fs_reg res1
= ubld
.vgrf(BRW_REGISTER_TYPE_D
);
4298 ubld
.MOV(res1
, brw_imm_d(0));
4299 set_predicate(dispatch_width
== 8 ? BRW_PREDICATE_ALIGN1_ANY8H
:
4300 dispatch_width
== 16 ? BRW_PREDICATE_ALIGN1_ANY16H
:
4301 BRW_PREDICATE_ALIGN1_ANY32H
,
4302 ubld
.MOV(res1
, brw_imm_d(-1)));
4304 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
), component(res1
, 0));
4307 case nir_intrinsic_vote_all
: {
4308 const fs_builder ubld
= bld
.exec_all().group(1, 0);
4310 /* The any/all predicates do not consider channel enables. To prevent
4311 * dead channels from affecting the result, we initialize the flag with
4312 * with the identity value for the logical operation.
4314 if (dispatch_width
== 32) {
4315 /* For SIMD32, we use a UD type so we fill both f0.0 and f0.1. */
4316 ubld
.MOV(retype(brw_flag_reg(0, 0), BRW_REGISTER_TYPE_UD
),
4317 brw_imm_ud(0xffffffff));
4319 ubld
.MOV(brw_flag_reg(0, 0), brw_imm_uw(0xffff));
4321 bld
.CMP(bld
.null_reg_d(), get_nir_src(instr
->src
[0]), brw_imm_d(0), BRW_CONDITIONAL_NZ
);
4323 /* For some reason, the any/all predicates don't work properly with
4324 * SIMD32. In particular, it appears that a SEL with a QtrCtrl of 2H
4325 * doesn't read the correct subset of the flag register and you end up
4326 * getting garbage in the second half. Work around this by using a pair
4327 * of 1-wide MOVs and scattering the result.
4329 fs_reg res1
= ubld
.vgrf(BRW_REGISTER_TYPE_D
);
4330 ubld
.MOV(res1
, brw_imm_d(0));
4331 set_predicate(dispatch_width
== 8 ? BRW_PREDICATE_ALIGN1_ALL8H
:
4332 dispatch_width
== 16 ? BRW_PREDICATE_ALIGN1_ALL16H
:
4333 BRW_PREDICATE_ALIGN1_ALL32H
,
4334 ubld
.MOV(res1
, brw_imm_d(-1)));
4336 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
), component(res1
, 0));
4339 case nir_intrinsic_vote_eq
: {
4340 fs_reg value
= get_nir_src(instr
->src
[0]);
4341 fs_reg uniformized
= bld
.emit_uniformize(value
);
4342 const fs_builder ubld
= bld
.exec_all().group(1, 0);
4344 /* The any/all predicates do not consider channel enables. To prevent
4345 * dead channels from affecting the result, we initialize the flag with
4346 * with the identity value for the logical operation.
4348 if (dispatch_width
== 32) {
4349 /* For SIMD32, we use a UD type so we fill both f0.0 and f0.1. */
4350 ubld
.MOV(retype(brw_flag_reg(0, 0), BRW_REGISTER_TYPE_UD
),
4351 brw_imm_ud(0xffffffff));
4353 ubld
.MOV(brw_flag_reg(0, 0), brw_imm_uw(0xffff));
4355 bld
.CMP(bld
.null_reg_d(), value
, uniformized
, BRW_CONDITIONAL_Z
);
4357 /* For some reason, the any/all predicates don't work properly with
4358 * SIMD32. In particular, it appears that a SEL with a QtrCtrl of 2H
4359 * doesn't read the correct subset of the flag register and you end up
4360 * getting garbage in the second half. Work around this by using a pair
4361 * of 1-wide MOVs and scattering the result.
4363 fs_reg res1
= ubld
.vgrf(BRW_REGISTER_TYPE_D
);
4364 ubld
.MOV(res1
, brw_imm_d(0));
4365 set_predicate(dispatch_width
== 8 ? BRW_PREDICATE_ALIGN1_ALL8H
:
4366 dispatch_width
== 16 ? BRW_PREDICATE_ALIGN1_ALL16H
:
4367 BRW_PREDICATE_ALIGN1_ALL32H
,
4368 ubld
.MOV(res1
, brw_imm_d(-1)));
4370 bld
.MOV(retype(dest
, BRW_REGISTER_TYPE_D
), component(res1
, 0));
4374 case nir_intrinsic_ballot
: {
4375 const fs_reg value
= retype(get_nir_src(instr
->src
[0]),
4376 BRW_REGISTER_TYPE_UD
);
4377 struct brw_reg flag
= brw_flag_reg(0, 0);
4378 /* FIXME: For SIMD32 programs, this causes us to stomp on f0.1 as well
4379 * as f0.0. This is a problem for fragment programs as we currently use
4380 * f0.1 for discards. Fortunately, we don't support SIMD32 fragment
4381 * programs yet so this isn't a problem. When we do, something will
4384 if (dispatch_width
== 32)
4385 flag
.type
= BRW_REGISTER_TYPE_UD
;
4387 bld
.exec_all().group(1, 0).MOV(flag
, brw_imm_ud(0u));
4388 bld
.CMP(bld
.null_reg_ud(), value
, brw_imm_ud(0u), BRW_CONDITIONAL_NZ
);
4390 if (instr
->dest
.ssa
.bit_size
> 32) {
4391 dest
.type
= BRW_REGISTER_TYPE_UQ
;
4393 dest
.type
= BRW_REGISTER_TYPE_UD
;
4395 bld
.MOV(dest
, flag
);
4399 case nir_intrinsic_read_invocation
: {
4400 const fs_reg value
= get_nir_src(instr
->src
[0]);
4401 const fs_reg invocation
= get_nir_src(instr
->src
[1]);
4402 fs_reg tmp
= bld
.vgrf(value
.type
);
4404 bld
.exec_all().emit(SHADER_OPCODE_BROADCAST
, tmp
, value
,
4405 bld
.emit_uniformize(invocation
));
4407 bld
.MOV(retype(dest
, value
.type
), fs_reg(component(tmp
, 0)));
4411 case nir_intrinsic_read_first_invocation
: {
4412 const fs_reg value
= get_nir_src(instr
->src
[0]);
4413 bld
.MOV(retype(dest
, value
.type
), bld
.emit_uniformize(value
));
4418 unreachable("unknown intrinsic");
4423 fs_visitor::nir_emit_ssbo_atomic(const fs_builder
&bld
,
4424 int op
, nir_intrinsic_instr
*instr
)
4426 if (stage
== MESA_SHADER_FRAGMENT
)
4427 brw_wm_prog_data(prog_data
)->has_side_effects
= true;
4430 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
4431 dest
= get_nir_dest(instr
->dest
);
4434 nir_const_value
*const_surface
= nir_src_as_const_value(instr
->src
[0]);
4435 if (const_surface
) {
4436 unsigned surf_index
= stage_prog_data
->binding_table
.ssbo_start
+
4437 const_surface
->u32
[0];
4438 surface
= brw_imm_ud(surf_index
);
4439 brw_mark_surface_used(prog_data
, surf_index
);
4441 surface
= vgrf(glsl_type::uint_type
);
4442 bld
.ADD(surface
, get_nir_src(instr
->src
[0]),
4443 brw_imm_ud(stage_prog_data
->binding_table
.ssbo_start
));
4445 /* Assume this may touch any SSBO. This is the same we do for other
4446 * UBO/SSBO accesses with non-constant surface.
4448 brw_mark_surface_used(prog_data
,
4449 stage_prog_data
->binding_table
.ssbo_start
+
4450 nir
->info
.num_ssbos
- 1);
4453 fs_reg offset
= get_nir_src(instr
->src
[1]);
4454 fs_reg data1
= get_nir_src(instr
->src
[2]);
4456 if (op
== BRW_AOP_CMPWR
)
4457 data2
= get_nir_src(instr
->src
[3]);
4459 /* Emit the actual atomic operation */
4461 fs_reg atomic_result
= emit_untyped_atomic(bld
, surface
, offset
,
4463 1 /* dims */, 1 /* rsize */,
4465 BRW_PREDICATE_NONE
);
4466 dest
.type
= atomic_result
.type
;
4467 bld
.MOV(dest
, atomic_result
);
4471 fs_visitor::nir_emit_shared_atomic(const fs_builder
&bld
,
4472 int op
, nir_intrinsic_instr
*instr
)
4475 if (nir_intrinsic_infos
[instr
->intrinsic
].has_dest
)
4476 dest
= get_nir_dest(instr
->dest
);
4478 fs_reg surface
= brw_imm_ud(GEN7_BTI_SLM
);
4480 fs_reg data1
= get_nir_src(instr
->src
[1]);
4482 if (op
== BRW_AOP_CMPWR
)
4483 data2
= get_nir_src(instr
->src
[2]);
4485 /* Get the offset */
4486 nir_const_value
*const_offset
= nir_src_as_const_value(instr
->src
[0]);
4488 offset
= brw_imm_ud(instr
->const_index
[0] + const_offset
->u32
[0]);
4490 offset
= vgrf(glsl_type::uint_type
);
4492 retype(get_nir_src(instr
->src
[0]), BRW_REGISTER_TYPE_UD
),
4493 brw_imm_ud(instr
->const_index
[0]));
4496 /* Emit the actual atomic operation operation */
4498 fs_reg atomic_result
= emit_untyped_atomic(bld
, surface
, offset
,
4500 1 /* dims */, 1 /* rsize */,
4502 BRW_PREDICATE_NONE
);
4503 dest
.type
= atomic_result
.type
;
4504 bld
.MOV(dest
, atomic_result
);
4508 fs_visitor::nir_emit_texture(const fs_builder
&bld
, nir_tex_instr
*instr
)
4510 unsigned texture
= instr
->texture_index
;
4511 unsigned sampler
= instr
->sampler_index
;
4513 fs_reg srcs
[TEX_LOGICAL_NUM_SRCS
];
4515 srcs
[TEX_LOGICAL_SRC_SURFACE
] = brw_imm_ud(texture
);
4516 srcs
[TEX_LOGICAL_SRC_SAMPLER
] = brw_imm_ud(sampler
);
4518 int lod_components
= 0;
4520 /* The hardware requires a LOD for buffer textures */
4521 if (instr
->sampler_dim
== GLSL_SAMPLER_DIM_BUF
)
4522 srcs
[TEX_LOGICAL_SRC_LOD
] = brw_imm_d(0);
4524 uint32_t header_bits
= 0;
4525 for (unsigned i
= 0; i
< instr
->num_srcs
; i
++) {
4526 fs_reg src
= get_nir_src(instr
->src
[i
].src
);
4527 switch (instr
->src
[i
].src_type
) {
4528 case nir_tex_src_bias
:
4529 srcs
[TEX_LOGICAL_SRC_LOD
] =
4530 retype(get_nir_src_imm(instr
->src
[i
].src
), BRW_REGISTER_TYPE_F
);
4532 case nir_tex_src_comparator
:
4533 srcs
[TEX_LOGICAL_SRC_SHADOW_C
] = retype(src
, BRW_REGISTER_TYPE_F
);
4535 case nir_tex_src_coord
:
4536 switch (instr
->op
) {
4538 case nir_texop_txf_ms
:
4539 case nir_texop_txf_ms_mcs
:
4540 case nir_texop_samples_identical
:
4541 srcs
[TEX_LOGICAL_SRC_COORDINATE
] = retype(src
, BRW_REGISTER_TYPE_D
);
4544 srcs
[TEX_LOGICAL_SRC_COORDINATE
] = retype(src
, BRW_REGISTER_TYPE_F
);
4548 case nir_tex_src_ddx
:
4549 srcs
[TEX_LOGICAL_SRC_LOD
] = retype(src
, BRW_REGISTER_TYPE_F
);
4550 lod_components
= nir_tex_instr_src_size(instr
, i
);
4552 case nir_tex_src_ddy
:
4553 srcs
[TEX_LOGICAL_SRC_LOD2
] = retype(src
, BRW_REGISTER_TYPE_F
);
4555 case nir_tex_src_lod
:
4556 switch (instr
->op
) {
4558 srcs
[TEX_LOGICAL_SRC_LOD
] =
4559 retype(get_nir_src_imm(instr
->src
[i
].src
), BRW_REGISTER_TYPE_UD
);
4562 srcs
[TEX_LOGICAL_SRC_LOD
] =
4563 retype(get_nir_src_imm(instr
->src
[i
].src
), BRW_REGISTER_TYPE_D
);
4566 srcs
[TEX_LOGICAL_SRC_LOD
] =
4567 retype(get_nir_src_imm(instr
->src
[i
].src
), BRW_REGISTER_TYPE_F
);
4571 case nir_tex_src_ms_index
:
4572 srcs
[TEX_LOGICAL_SRC_SAMPLE_INDEX
] = retype(src
, BRW_REGISTER_TYPE_UD
);
4575 case nir_tex_src_offset
: {
4576 nir_const_value
*const_offset
=
4577 nir_src_as_const_value(instr
->src
[i
].src
);
4578 unsigned offset_bits
= 0;
4580 brw_texture_offset(const_offset
->i32
,
4581 nir_tex_instr_src_size(instr
, i
),
4583 header_bits
|= offset_bits
;
4585 srcs
[TEX_LOGICAL_SRC_TG4_OFFSET
] =
4586 retype(src
, BRW_REGISTER_TYPE_D
);
4591 case nir_tex_src_projector
:
4592 unreachable("should be lowered");
4594 case nir_tex_src_texture_offset
: {
4595 /* Figure out the highest possible texture index and mark it as used */
4596 uint32_t max_used
= texture
+ instr
->texture_array_size
- 1;
4597 if (instr
->op
== nir_texop_tg4
&& devinfo
->gen
< 8) {
4598 max_used
+= stage_prog_data
->binding_table
.gather_texture_start
;
4600 max_used
+= stage_prog_data
->binding_table
.texture_start
;
4602 brw_mark_surface_used(prog_data
, max_used
);
4604 /* Emit code to evaluate the actual indexing expression */
4605 fs_reg tmp
= vgrf(glsl_type::uint_type
);
4606 bld
.ADD(tmp
, src
, brw_imm_ud(texture
));
4607 srcs
[TEX_LOGICAL_SRC_SURFACE
] = bld
.emit_uniformize(tmp
);
4611 case nir_tex_src_sampler_offset
: {
4612 /* Emit code to evaluate the actual indexing expression */
4613 fs_reg tmp
= vgrf(glsl_type::uint_type
);
4614 bld
.ADD(tmp
, src
, brw_imm_ud(sampler
));
4615 srcs
[TEX_LOGICAL_SRC_SAMPLER
] = bld
.emit_uniformize(tmp
);
4619 case nir_tex_src_ms_mcs
:
4620 assert(instr
->op
== nir_texop_txf_ms
);
4621 srcs
[TEX_LOGICAL_SRC_MCS
] = retype(src
, BRW_REGISTER_TYPE_D
);
4624 case nir_tex_src_plane
: {
4625 nir_const_value
*const_plane
=
4626 nir_src_as_const_value(instr
->src
[i
].src
);
4627 const uint32_t plane
= const_plane
->u32
[0];
4628 const uint32_t texture_index
=
4629 instr
->texture_index
+
4630 stage_prog_data
->binding_table
.plane_start
[plane
] -
4631 stage_prog_data
->binding_table
.texture_start
;
4633 srcs
[TEX_LOGICAL_SRC_SURFACE
] = brw_imm_ud(texture_index
);
4638 unreachable("unknown texture source");
4642 if (srcs
[TEX_LOGICAL_SRC_MCS
].file
== BAD_FILE
&&
4643 (instr
->op
== nir_texop_txf_ms
||
4644 instr
->op
== nir_texop_samples_identical
)) {
4645 if (devinfo
->gen
>= 7 &&
4646 key_tex
->compressed_multisample_layout_mask
& (1 << texture
)) {
4647 srcs
[TEX_LOGICAL_SRC_MCS
] =
4648 emit_mcs_fetch(srcs
[TEX_LOGICAL_SRC_COORDINATE
],
4649 instr
->coord_components
,
4650 srcs
[TEX_LOGICAL_SRC_SURFACE
]);
4652 srcs
[TEX_LOGICAL_SRC_MCS
] = brw_imm_ud(0u);
4656 srcs
[TEX_LOGICAL_SRC_COORD_COMPONENTS
] = brw_imm_d(instr
->coord_components
);
4657 srcs
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
] = brw_imm_d(lod_components
);
4660 switch (instr
->op
) {
4662 opcode
= (stage
== MESA_SHADER_FRAGMENT
? SHADER_OPCODE_TEX_LOGICAL
:
4663 SHADER_OPCODE_TXL_LOGICAL
);
4666 opcode
= FS_OPCODE_TXB_LOGICAL
;
4669 opcode
= SHADER_OPCODE_TXL_LOGICAL
;
4672 opcode
= SHADER_OPCODE_TXD_LOGICAL
;
4675 opcode
= SHADER_OPCODE_TXF_LOGICAL
;
4677 case nir_texop_txf_ms
:
4678 if ((key_tex
->msaa_16
& (1 << sampler
)))
4679 opcode
= SHADER_OPCODE_TXF_CMS_W_LOGICAL
;
4681 opcode
= SHADER_OPCODE_TXF_CMS_LOGICAL
;
4683 case nir_texop_txf_ms_mcs
:
4684 opcode
= SHADER_OPCODE_TXF_MCS_LOGICAL
;
4686 case nir_texop_query_levels
:
4688 opcode
= SHADER_OPCODE_TXS_LOGICAL
;
4691 opcode
= SHADER_OPCODE_LOD_LOGICAL
;
4694 if (srcs
[TEX_LOGICAL_SRC_TG4_OFFSET
].file
!= BAD_FILE
)
4695 opcode
= SHADER_OPCODE_TG4_OFFSET_LOGICAL
;
4697 opcode
= SHADER_OPCODE_TG4_LOGICAL
;
4699 case nir_texop_texture_samples
:
4700 opcode
= SHADER_OPCODE_SAMPLEINFO_LOGICAL
;
4702 case nir_texop_samples_identical
: {
4703 fs_reg dst
= retype(get_nir_dest(instr
->dest
), BRW_REGISTER_TYPE_D
);
4705 /* If mcs is an immediate value, it means there is no MCS. In that case
4706 * just return false.
4708 if (srcs
[TEX_LOGICAL_SRC_MCS
].file
== BRW_IMMEDIATE_VALUE
) {
4709 bld
.MOV(dst
, brw_imm_ud(0u));
4710 } else if ((key_tex
->msaa_16
& (1 << sampler
))) {
4711 fs_reg tmp
= vgrf(glsl_type::uint_type
);
4712 bld
.OR(tmp
, srcs
[TEX_LOGICAL_SRC_MCS
],
4713 offset(srcs
[TEX_LOGICAL_SRC_MCS
], bld
, 1));
4714 bld
.CMP(dst
, tmp
, brw_imm_ud(0u), BRW_CONDITIONAL_EQ
);
4716 bld
.CMP(dst
, srcs
[TEX_LOGICAL_SRC_MCS
], brw_imm_ud(0u),
4717 BRW_CONDITIONAL_EQ
);
4722 unreachable("unknown texture opcode");
4725 if (instr
->op
== nir_texop_tg4
) {
4726 if (instr
->component
== 1 &&
4727 key_tex
->gather_channel_quirk_mask
& (1 << texture
)) {
4728 /* gather4 sampler is broken for green channel on RG32F --
4729 * we must ask for blue instead.
4731 header_bits
|= 2 << 16;
4733 header_bits
|= instr
->component
<< 16;
4737 fs_reg dst
= bld
.vgrf(brw_type_for_nir_type(devinfo
, instr
->dest_type
), 4);
4738 fs_inst
*inst
= bld
.emit(opcode
, dst
, srcs
, ARRAY_SIZE(srcs
));
4739 inst
->offset
= header_bits
;
4741 const unsigned dest_size
= nir_tex_instr_dest_size(instr
);
4742 if (devinfo
->gen
>= 9 &&
4743 instr
->op
!= nir_texop_tg4
&& instr
->op
!= nir_texop_query_levels
) {
4744 unsigned write_mask
= instr
->dest
.is_ssa
?
4745 nir_ssa_def_components_read(&instr
->dest
.ssa
):
4746 (1 << dest_size
) - 1;
4747 assert(write_mask
!= 0); /* dead code should have been eliminated */
4748 inst
->size_written
= util_last_bit(write_mask
) *
4749 inst
->dst
.component_size(inst
->exec_size
);
4751 inst
->size_written
= 4 * inst
->dst
.component_size(inst
->exec_size
);
4754 if (srcs
[TEX_LOGICAL_SRC_SHADOW_C
].file
!= BAD_FILE
)
4755 inst
->shadow_compare
= true;
4757 if (instr
->op
== nir_texop_tg4
&& devinfo
->gen
== 6)
4758 emit_gen6_gather_wa(key_tex
->gen6_gather_wa
[texture
], dst
);
4761 for (unsigned i
= 0; i
< dest_size
; i
++)
4762 nir_dest
[i
] = offset(dst
, bld
, i
);
4764 if (instr
->op
== nir_texop_query_levels
) {
4765 /* # levels is in .w */
4766 nir_dest
[0] = offset(dst
, bld
, 3);
4767 } else if (instr
->op
== nir_texop_txs
&&
4768 dest_size
>= 3 && devinfo
->gen
< 7) {
4769 /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
4770 fs_reg depth
= offset(dst
, bld
, 2);
4771 nir_dest
[2] = vgrf(glsl_type::int_type
);
4772 bld
.emit_minmax(nir_dest
[2], depth
, brw_imm_d(1), BRW_CONDITIONAL_GE
);
4775 bld
.LOAD_PAYLOAD(get_nir_dest(instr
->dest
), nir_dest
, dest_size
, 0);
4779 fs_visitor::nir_emit_jump(const fs_builder
&bld
, nir_jump_instr
*instr
)
4781 switch (instr
->type
) {
4782 case nir_jump_break
:
4783 bld
.emit(BRW_OPCODE_BREAK
);
4785 case nir_jump_continue
:
4786 bld
.emit(BRW_OPCODE_CONTINUE
);
4788 case nir_jump_return
:
4790 unreachable("unknown jump");
4795 * This helper takes the result of a load operation that reads 32-bit elements
4803 * and shuffles the data to get this:
4810 * Which is exactly what we want if the load is reading 64-bit components
4811 * like doubles, where x represents the low 32-bit of the x double component
4812 * and y represents the high 32-bit of the x double component (likewise with
4813 * z and w for double component y). The parameter @components represents
4814 * the number of 64-bit components present in @src. This would typically be
4815 * 2 at most, since we can only fit 2 double elements in the result of a
4818 * Notice that @dst and @src can be the same register.
4821 shuffle_32bit_load_result_to_64bit_data(const fs_builder
&bld
,
4824 uint32_t components
)
4826 assert(type_sz(src
.type
) == 4);
4827 assert(type_sz(dst
.type
) == 8);
4829 /* A temporary that we will use to shuffle the 32-bit data of each
4830 * component in the vector into valid 64-bit data. We can't write directly
4831 * to dst because dst can be (and would usually be) the same as src
4832 * and in that case the first MOV in the loop below would overwrite the
4833 * data read in the second MOV.
4835 fs_reg tmp
= bld
.vgrf(dst
.type
);
4837 for (unsigned i
= 0; i
< components
; i
++) {
4838 const fs_reg component_i
= offset(src
, bld
, 2 * i
);
4840 bld
.MOV(subscript(tmp
, src
.type
, 0), component_i
);
4841 bld
.MOV(subscript(tmp
, src
.type
, 1), offset(component_i
, bld
, 1));
4843 bld
.MOV(offset(dst
, bld
, i
), tmp
);
4848 * This helper does the inverse operation of
4849 * SHUFFLE_32BIT_LOAD_RESULT_TO_64BIT_DATA.
4851 * We need to do this when we are going to use untyped write messsages that
4852 * operate with 32-bit components in order to arrange our 64-bit data to be
4853 * in the expected layout.
4855 * Notice that callers of this function, unlike in the case of the inverse
4856 * operation, would typically need to call this with dst and src being
4857 * different registers, since they would otherwise corrupt the original
4858 * 64-bit data they are about to write. Because of this the function checks
4859 * that the src and dst regions involved in the operation do not overlap.
4862 shuffle_64bit_data_for_32bit_write(const fs_builder
&bld
,
4864 uint32_t components
)
4866 assert(type_sz(src
.type
) == 8);
4868 fs_reg dst
= bld
.vgrf(BRW_REGISTER_TYPE_D
, 2 * components
);
4870 for (unsigned i
= 0; i
< components
; i
++) {
4871 const fs_reg component_i
= offset(src
, bld
, i
);
4872 bld
.MOV(offset(dst
, bld
, 2 * i
), subscript(component_i
, dst
.type
, 0));
4873 bld
.MOV(offset(dst
, bld
, 2 * i
+ 1), subscript(component_i
, dst
.type
, 1));
4880 setup_imm_df(const fs_builder
&bld
, double v
)
4882 const struct gen_device_info
*devinfo
= bld
.shader
->devinfo
;
4883 assert(devinfo
->gen
>= 7);
4885 if (devinfo
->gen
>= 8)
4886 return brw_imm_df(v
);
4888 /* gen7.5 does not support DF immediates straighforward but the DIM
4889 * instruction allows to set the 64-bit immediate value.
4891 if (devinfo
->is_haswell
) {
4892 const fs_builder ubld
= bld
.exec_all().group(1, 0);
4893 fs_reg dst
= ubld
.vgrf(BRW_REGISTER_TYPE_DF
, 1);
4894 ubld
.DIM(dst
, brw_imm_df(v
));
4895 return component(dst
, 0);
4898 /* gen7 does not support DF immediates, so we generate a 64-bit constant by
4899 * writing the low 32-bit of the constant to suboffset 0 of a VGRF and
4900 * the high 32-bit to suboffset 4 and then applying a stride of 0.
4902 * Alternatively, we could also produce a normal VGRF (without stride 0)
4903 * by writing to all the channels in the VGRF, however, that would hit the
4904 * gen7 bug where we have to split writes that span more than 1 register
4905 * into instructions with a width of 4 (otherwise the write to the second
4906 * register written runs into an execmask hardware bug) which isn't very
4919 const fs_builder ubld
= bld
.exec_all().group(1, 0);
4920 const fs_reg tmp
= ubld
.vgrf(BRW_REGISTER_TYPE_UD
, 2);
4921 ubld
.MOV(tmp
, brw_imm_ud(di
.i1
));
4922 ubld
.MOV(horiz_offset(tmp
, 1), brw_imm_ud(di
.i2
));
4924 return component(retype(tmp
, BRW_REGISTER_TYPE_DF
), 0);