2 * Copyright © 2014 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 * Connor Abbott (cwabbott0@gmail.com)
25 * Jason Ekstrand (jason@jlekstrand.net)
30 * This lowering pass converts references to input/output variables with
31 * loads/stores to actual input/output intrinsics.
35 #include "nir_builder.h"
36 #include "nir_deref.h"
38 #include "util/u_math.h"
40 struct lower_io_state
{
43 int (*type_size
)(const struct glsl_type
*type
, bool);
44 nir_variable_mode modes
;
45 nir_lower_io_options options
;
48 static nir_intrinsic_op
49 ssbo_atomic_for_deref(nir_intrinsic_op deref_op
)
52 #define OP(O) case nir_intrinsic_deref_##O: return nir_intrinsic_ssbo_##O;
69 unreachable("Invalid SSBO atomic");
73 static nir_intrinsic_op
74 global_atomic_for_deref(nir_intrinsic_op deref_op
)
77 #define OP(O) case nir_intrinsic_deref_##O: return nir_intrinsic_global_##O;
94 unreachable("Invalid SSBO atomic");
98 static nir_intrinsic_op
99 shared_atomic_for_deref(nir_intrinsic_op deref_op
)
102 #define OP(O) case nir_intrinsic_deref_##O: return nir_intrinsic_shared_##O;
116 OP(atomic_fcomp_swap
)
119 unreachable("Invalid shared atomic");
124 nir_assign_var_locations(struct exec_list
*var_list
, unsigned *size
,
125 int (*type_size
)(const struct glsl_type
*, bool))
127 unsigned location
= 0;
129 nir_foreach_variable(var
, var_list
) {
131 * UBOs have their own address spaces, so don't count them towards the
132 * number of global uniforms
134 if (var
->data
.mode
== nir_var_mem_ubo
|| var
->data
.mode
== nir_var_mem_ssbo
)
137 var
->data
.driver_location
= location
;
138 bool bindless_type_size
= var
->data
.mode
== nir_var_shader_in
||
139 var
->data
.mode
== nir_var_shader_out
||
141 location
+= type_size(var
->type
, bindless_type_size
);
148 * Return true if the given variable is a per-vertex input/output array.
149 * (such as geometry shader inputs).
152 nir_is_per_vertex_io(const nir_variable
*var
, gl_shader_stage stage
)
154 if (var
->data
.patch
|| !glsl_type_is_array(var
->type
))
157 if (var
->data
.mode
== nir_var_shader_in
)
158 return stage
== MESA_SHADER_GEOMETRY
||
159 stage
== MESA_SHADER_TESS_CTRL
||
160 stage
== MESA_SHADER_TESS_EVAL
;
162 if (var
->data
.mode
== nir_var_shader_out
)
163 return stage
== MESA_SHADER_TESS_CTRL
;
169 get_io_offset(nir_builder
*b
, nir_deref_instr
*deref
,
170 nir_ssa_def
**vertex_index
,
171 int (*type_size
)(const struct glsl_type
*, bool),
172 unsigned *component
, bool bts
)
175 nir_deref_path_init(&path
, deref
, NULL
);
177 assert(path
.path
[0]->deref_type
== nir_deref_type_var
);
178 nir_deref_instr
**p
= &path
.path
[1];
180 /* For per-vertex input arrays (i.e. geometry shader inputs), keep the
181 * outermost array index separate. Process the rest normally.
183 if (vertex_index
!= NULL
) {
184 assert((*p
)->deref_type
== nir_deref_type_array
);
185 *vertex_index
= nir_ssa_for_src(b
, (*p
)->arr
.index
, 1);
189 if (path
.path
[0]->var
->data
.compact
) {
190 assert((*p
)->deref_type
== nir_deref_type_array
);
191 assert(glsl_type_is_scalar((*p
)->type
));
193 /* We always lower indirect dereferences for "compact" array vars. */
194 const unsigned index
= nir_src_as_uint((*p
)->arr
.index
);
195 const unsigned total_offset
= *component
+ index
;
196 const unsigned slot_offset
= total_offset
/ 4;
197 *component
= total_offset
% 4;
198 return nir_imm_int(b
, type_size(glsl_vec4_type(), bts
) * slot_offset
);
201 /* Just emit code and let constant-folding go to town */
202 nir_ssa_def
*offset
= nir_imm_int(b
, 0);
205 if ((*p
)->deref_type
== nir_deref_type_array
) {
206 unsigned size
= type_size((*p
)->type
, bts
);
209 nir_amul_imm(b
, nir_ssa_for_src(b
, (*p
)->arr
.index
, 1), size
);
211 offset
= nir_iadd(b
, offset
, mul
);
212 } else if ((*p
)->deref_type
== nir_deref_type_struct
) {
213 /* p starts at path[1], so this is safe */
214 nir_deref_instr
*parent
= *(p
- 1);
216 unsigned field_offset
= 0;
217 for (unsigned i
= 0; i
< (*p
)->strct
.index
; i
++) {
218 field_offset
+= type_size(glsl_get_struct_field(parent
->type
, i
), bts
);
220 offset
= nir_iadd_imm(b
, offset
, field_offset
);
222 unreachable("Unsupported deref type");
226 nir_deref_path_finish(&path
);
232 emit_load(struct lower_io_state
*state
,
233 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
234 unsigned component
, unsigned num_components
, unsigned bit_size
,
237 nir_builder
*b
= &state
->builder
;
238 const nir_shader
*nir
= b
->shader
;
239 nir_variable_mode mode
= var
->data
.mode
;
240 nir_ssa_def
*barycentric
= NULL
;
244 case nir_var_shader_in
:
245 if (nir
->info
.stage
== MESA_SHADER_FRAGMENT
&&
246 nir
->options
->use_interpolated_input_intrinsics
&&
247 var
->data
.interpolation
!= INTERP_MODE_FLAT
) {
248 if (var
->data
.interpolation
== INTERP_MODE_EXPLICIT
) {
249 assert(vertex_index
!= NULL
);
250 op
= nir_intrinsic_load_input_vertex
;
252 assert(vertex_index
== NULL
);
254 nir_intrinsic_op bary_op
;
255 if (var
->data
.sample
||
256 (state
->options
& nir_lower_io_force_sample_interpolation
))
257 bary_op
= nir_intrinsic_load_barycentric_sample
;
258 else if (var
->data
.centroid
)
259 bary_op
= nir_intrinsic_load_barycentric_centroid
;
261 bary_op
= nir_intrinsic_load_barycentric_pixel
;
263 barycentric
= nir_load_barycentric(&state
->builder
, bary_op
,
264 var
->data
.interpolation
);
265 op
= nir_intrinsic_load_interpolated_input
;
268 op
= vertex_index
? nir_intrinsic_load_per_vertex_input
:
269 nir_intrinsic_load_input
;
272 case nir_var_shader_out
:
273 op
= vertex_index
? nir_intrinsic_load_per_vertex_output
:
274 nir_intrinsic_load_output
;
276 case nir_var_uniform
:
277 op
= nir_intrinsic_load_uniform
;
280 unreachable("Unknown variable mode");
283 nir_intrinsic_instr
*load
=
284 nir_intrinsic_instr_create(state
->builder
.shader
, op
);
285 load
->num_components
= num_components
;
287 nir_intrinsic_set_base(load
, var
->data
.driver_location
);
288 if (mode
== nir_var_shader_in
|| mode
== nir_var_shader_out
)
289 nir_intrinsic_set_component(load
, component
);
291 if (load
->intrinsic
== nir_intrinsic_load_uniform
)
292 nir_intrinsic_set_range(load
,
293 state
->type_size(var
->type
, var
->data
.bindless
));
295 if (load
->intrinsic
== nir_intrinsic_load_input
||
296 load
->intrinsic
== nir_intrinsic_load_input_vertex
||
297 load
->intrinsic
== nir_intrinsic_load_uniform
)
298 nir_intrinsic_set_type(load
, type
);
301 load
->src
[0] = nir_src_for_ssa(vertex_index
);
302 load
->src
[1] = nir_src_for_ssa(offset
);
303 } else if (barycentric
) {
304 load
->src
[0] = nir_src_for_ssa(barycentric
);
305 load
->src
[1] = nir_src_for_ssa(offset
);
307 load
->src
[0] = nir_src_for_ssa(offset
);
310 nir_ssa_dest_init(&load
->instr
, &load
->dest
,
311 num_components
, bit_size
, NULL
);
312 nir_builder_instr_insert(b
, &load
->instr
);
314 return &load
->dest
.ssa
;
318 lower_load(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
319 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
320 unsigned component
, const struct glsl_type
*type
)
322 assert(intrin
->dest
.is_ssa
);
323 if (intrin
->dest
.ssa
.bit_size
== 64 &&
324 (state
->options
& nir_lower_io_lower_64bit_to_32
)) {
325 nir_builder
*b
= &state
->builder
;
327 const unsigned slot_size
= state
->type_size(glsl_dvec_type(2), false);
329 nir_ssa_def
*comp64
[4];
330 assert(component
== 0 || component
== 2);
331 unsigned dest_comp
= 0;
332 while (dest_comp
< intrin
->dest
.ssa
.num_components
) {
333 const unsigned num_comps
=
334 MIN2(intrin
->dest
.ssa
.num_components
- dest_comp
,
335 (4 - component
) / 2);
337 nir_ssa_def
*data32
=
338 emit_load(state
, vertex_index
, var
, offset
, component
,
339 num_comps
* 2, 32, nir_type_uint32
);
340 for (unsigned i
= 0; i
< num_comps
; i
++) {
341 comp64
[dest_comp
+ i
] =
342 nir_pack_64_2x32(b
, nir_channels(b
, data32
, 3 << (i
* 2)));
345 /* Only the first store has a component offset */
347 dest_comp
+= num_comps
;
348 offset
= nir_iadd_imm(b
, offset
, slot_size
);
351 return nir_vec(b
, comp64
, intrin
->dest
.ssa
.num_components
);
352 } else if (intrin
->dest
.ssa
.bit_size
== 1) {
353 /* Booleans are 32-bit */
354 assert(glsl_type_is_boolean(type
));
355 return nir_b2b1(&state
->builder
,
356 emit_load(state
, vertex_index
, var
, offset
, component
,
357 intrin
->dest
.ssa
.num_components
, 32,
360 return emit_load(state
, vertex_index
, var
, offset
, component
,
361 intrin
->dest
.ssa
.num_components
,
362 intrin
->dest
.ssa
.bit_size
,
363 nir_get_nir_type_for_glsl_type(type
));
368 emit_store(struct lower_io_state
*state
, nir_ssa_def
*data
,
369 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
370 unsigned component
, unsigned num_components
,
371 nir_component_mask_t write_mask
, nir_alu_type type
)
373 nir_builder
*b
= &state
->builder
;
374 nir_variable_mode mode
= var
->data
.mode
;
376 assert(mode
== nir_var_shader_out
);
378 op
= vertex_index
? nir_intrinsic_store_per_vertex_output
:
379 nir_intrinsic_store_output
;
381 nir_intrinsic_instr
*store
=
382 nir_intrinsic_instr_create(state
->builder
.shader
, op
);
383 store
->num_components
= num_components
;
385 store
->src
[0] = nir_src_for_ssa(data
);
387 nir_intrinsic_set_base(store
, var
->data
.driver_location
);
389 if (mode
== nir_var_shader_out
)
390 nir_intrinsic_set_component(store
, component
);
392 if (store
->intrinsic
== nir_intrinsic_store_output
)
393 nir_intrinsic_set_type(store
, type
);
395 nir_intrinsic_set_write_mask(store
, write_mask
);
398 store
->src
[1] = nir_src_for_ssa(vertex_index
);
400 store
->src
[vertex_index
? 2 : 1] = nir_src_for_ssa(offset
);
402 nir_builder_instr_insert(b
, &store
->instr
);
406 lower_store(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
407 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
408 unsigned component
, const struct glsl_type
*type
)
410 assert(intrin
->src
[1].is_ssa
);
411 if (intrin
->src
[1].ssa
->bit_size
== 64 &&
412 (state
->options
& nir_lower_io_lower_64bit_to_32
)) {
413 nir_builder
*b
= &state
->builder
;
415 const unsigned slot_size
= state
->type_size(glsl_dvec_type(2), false);
417 assert(component
== 0 || component
== 2);
418 unsigned src_comp
= 0;
419 nir_component_mask_t write_mask
= nir_intrinsic_write_mask(intrin
);
420 while (src_comp
< intrin
->num_components
) {
421 const unsigned num_comps
=
422 MIN2(intrin
->num_components
- src_comp
,
423 (4 - component
) / 2);
425 if (write_mask
& BITFIELD_MASK(num_comps
)) {
427 nir_channels(b
, intrin
->src
[1].ssa
,
428 BITFIELD_RANGE(src_comp
, num_comps
));
429 nir_ssa_def
*data32
= nir_bitcast_vector(b
, data
, 32);
431 nir_component_mask_t write_mask32
= 0;
432 for (unsigned i
= 0; i
< num_comps
; i
++) {
433 if (write_mask
& BITFIELD_MASK(num_comps
) & (1 << i
))
434 write_mask32
|= 3 << (i
* 2);
437 emit_store(state
, data32
, vertex_index
, var
, offset
,
438 component
, data32
->num_components
, write_mask32
,
442 /* Only the first store has a component offset */
444 src_comp
+= num_comps
;
445 write_mask
>>= num_comps
;
446 offset
= nir_iadd_imm(b
, offset
, slot_size
);
448 } else if (intrin
->dest
.ssa
.bit_size
== 1) {
449 /* Booleans are 32-bit */
450 assert(glsl_type_is_boolean(type
));
451 nir_ssa_def
*b32_val
= nir_b2b32(&state
->builder
, intrin
->src
[1].ssa
);
452 emit_store(state
, b32_val
, vertex_index
, var
, offset
,
453 component
, intrin
->num_components
,
454 nir_intrinsic_write_mask(intrin
),
457 emit_store(state
, intrin
->src
[1].ssa
, vertex_index
, var
, offset
,
458 component
, intrin
->num_components
,
459 nir_intrinsic_write_mask(intrin
),
460 nir_get_nir_type_for_glsl_type(type
));
465 lower_interpolate_at(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
466 nir_variable
*var
, nir_ssa_def
*offset
, unsigned component
,
467 const struct glsl_type
*type
)
469 nir_builder
*b
= &state
->builder
;
470 assert(var
->data
.mode
== nir_var_shader_in
);
472 /* Ignore interpolateAt() for flat variables - flat is flat. Lower
473 * interpolateAtVertex() for explicit variables.
475 if (var
->data
.interpolation
== INTERP_MODE_FLAT
||
476 var
->data
.interpolation
== INTERP_MODE_EXPLICIT
) {
477 nir_ssa_def
*vertex_index
= NULL
;
479 if (var
->data
.interpolation
== INTERP_MODE_EXPLICIT
) {
480 assert(intrin
->intrinsic
== nir_intrinsic_interp_deref_at_vertex
);
481 vertex_index
= intrin
->src
[1].ssa
;
484 return lower_load(intrin
, state
, vertex_index
, var
, offset
, component
, type
);
487 /* None of the supported APIs allow interpolation on 64-bit things */
488 assert(intrin
->dest
.is_ssa
&& intrin
->dest
.ssa
.bit_size
<= 32);
490 nir_intrinsic_op bary_op
;
491 switch (intrin
->intrinsic
) {
492 case nir_intrinsic_interp_deref_at_centroid
:
493 bary_op
= (state
->options
& nir_lower_io_force_sample_interpolation
) ?
494 nir_intrinsic_load_barycentric_sample
:
495 nir_intrinsic_load_barycentric_centroid
;
497 case nir_intrinsic_interp_deref_at_sample
:
498 bary_op
= nir_intrinsic_load_barycentric_at_sample
;
500 case nir_intrinsic_interp_deref_at_offset
:
501 bary_op
= nir_intrinsic_load_barycentric_at_offset
;
504 unreachable("Bogus interpolateAt() intrinsic.");
507 nir_intrinsic_instr
*bary_setup
=
508 nir_intrinsic_instr_create(state
->builder
.shader
, bary_op
);
510 nir_ssa_dest_init(&bary_setup
->instr
, &bary_setup
->dest
, 2, 32, NULL
);
511 nir_intrinsic_set_interp_mode(bary_setup
, var
->data
.interpolation
);
513 if (intrin
->intrinsic
== nir_intrinsic_interp_deref_at_sample
||
514 intrin
->intrinsic
== nir_intrinsic_interp_deref_at_offset
||
515 intrin
->intrinsic
== nir_intrinsic_interp_deref_at_vertex
)
516 nir_src_copy(&bary_setup
->src
[0], &intrin
->src
[1], bary_setup
);
518 nir_builder_instr_insert(b
, &bary_setup
->instr
);
520 nir_intrinsic_instr
*load
=
521 nir_intrinsic_instr_create(state
->builder
.shader
,
522 nir_intrinsic_load_interpolated_input
);
523 load
->num_components
= intrin
->num_components
;
525 nir_intrinsic_set_base(load
, var
->data
.driver_location
);
526 nir_intrinsic_set_component(load
, component
);
528 load
->src
[0] = nir_src_for_ssa(&bary_setup
->dest
.ssa
);
529 load
->src
[1] = nir_src_for_ssa(offset
);
531 assert(intrin
->dest
.is_ssa
);
532 nir_ssa_dest_init(&load
->instr
, &load
->dest
,
533 intrin
->dest
.ssa
.num_components
,
534 intrin
->dest
.ssa
.bit_size
, NULL
);
535 nir_builder_instr_insert(b
, &load
->instr
);
537 return &load
->dest
.ssa
;
541 nir_lower_io_block(nir_block
*block
,
542 struct lower_io_state
*state
)
544 nir_builder
*b
= &state
->builder
;
545 const nir_shader_compiler_options
*options
= b
->shader
->options
;
546 bool progress
= false;
548 nir_foreach_instr_safe(instr
, block
) {
549 if (instr
->type
!= nir_instr_type_intrinsic
)
552 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
554 switch (intrin
->intrinsic
) {
555 case nir_intrinsic_load_deref
:
556 case nir_intrinsic_store_deref
:
557 /* We can lower the io for this nir instrinsic */
559 case nir_intrinsic_interp_deref_at_centroid
:
560 case nir_intrinsic_interp_deref_at_sample
:
561 case nir_intrinsic_interp_deref_at_offset
:
562 case nir_intrinsic_interp_deref_at_vertex
:
563 /* We can optionally lower these to load_interpolated_input */
564 if (options
->use_interpolated_input_intrinsics
)
567 /* We can't lower the io for this nir instrinsic, so skip it */
571 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
573 nir_variable_mode mode
= deref
->mode
;
574 assert(util_is_power_of_two_nonzero(mode
));
575 if ((state
->modes
& mode
) == 0)
578 nir_variable
*var
= nir_deref_instr_get_variable(deref
);
580 b
->cursor
= nir_before_instr(instr
);
582 const bool per_vertex
= nir_is_per_vertex_io(var
, b
->shader
->info
.stage
);
585 nir_ssa_def
*vertex_index
= NULL
;
586 unsigned component_offset
= var
->data
.location_frac
;
587 bool bindless_type_size
= mode
== nir_var_shader_in
||
588 mode
== nir_var_shader_out
||
591 offset
= get_io_offset(b
, deref
, per_vertex
? &vertex_index
: NULL
,
592 state
->type_size
, &component_offset
,
595 nir_ssa_def
*replacement
= NULL
;
597 switch (intrin
->intrinsic
) {
598 case nir_intrinsic_load_deref
:
599 replacement
= lower_load(intrin
, state
, vertex_index
, var
, offset
,
600 component_offset
, deref
->type
);
603 case nir_intrinsic_store_deref
:
604 lower_store(intrin
, state
, vertex_index
, var
, offset
,
605 component_offset
, deref
->type
);
608 case nir_intrinsic_interp_deref_at_centroid
:
609 case nir_intrinsic_interp_deref_at_sample
:
610 case nir_intrinsic_interp_deref_at_offset
:
611 case nir_intrinsic_interp_deref_at_vertex
:
612 assert(vertex_index
== NULL
);
613 replacement
= lower_interpolate_at(intrin
, state
, var
, offset
,
614 component_offset
, deref
->type
);
622 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
,
623 nir_src_for_ssa(replacement
));
625 nir_instr_remove(&intrin
->instr
);
633 nir_lower_io_impl(nir_function_impl
*impl
,
634 nir_variable_mode modes
,
635 int (*type_size
)(const struct glsl_type
*, bool),
636 nir_lower_io_options options
)
638 struct lower_io_state state
;
639 bool progress
= false;
641 nir_builder_init(&state
.builder
, impl
);
642 state
.dead_ctx
= ralloc_context(NULL
);
644 state
.type_size
= type_size
;
645 state
.options
= options
;
647 ASSERTED nir_variable_mode supported_modes
=
648 nir_var_shader_in
| nir_var_shader_out
| nir_var_uniform
;
649 assert(!(modes
& ~supported_modes
));
651 nir_foreach_block(block
, impl
) {
652 progress
|= nir_lower_io_block(block
, &state
);
655 ralloc_free(state
.dead_ctx
);
657 nir_metadata_preserve(impl
, nir_metadata_block_index
|
658 nir_metadata_dominance
);
662 /** Lower load/store_deref intrinsics on I/O variables to offset-based intrinsics
664 * This pass is intended to be used for cross-stage shader I/O and driver-
665 * managed uniforms to turn deref-based access into a simpler model using
666 * locations or offsets. For fragment shader inputs, it can optionally turn
667 * load_deref into an explicit interpolation using barycentrics coming from
668 * one of the load_barycentric_* intrinsics. This pass requires that all
669 * deref chains are complete and contain no casts.
672 nir_lower_io(nir_shader
*shader
, nir_variable_mode modes
,
673 int (*type_size
)(const struct glsl_type
*, bool),
674 nir_lower_io_options options
)
676 bool progress
= false;
678 nir_foreach_function(function
, shader
) {
679 if (function
->impl
) {
680 progress
|= nir_lower_io_impl(function
->impl
, modes
,
689 type_scalar_size_bytes(const struct glsl_type
*type
)
691 assert(glsl_type_is_vector_or_scalar(type
) ||
692 glsl_type_is_matrix(type
));
693 return glsl_type_is_boolean(type
) ? 4 : glsl_get_bit_size(type
) / 8;
697 build_addr_iadd(nir_builder
*b
, nir_ssa_def
*addr
,
698 nir_address_format addr_format
, nir_ssa_def
*offset
)
700 assert(offset
->num_components
== 1);
701 assert(addr
->bit_size
== offset
->bit_size
);
703 switch (addr_format
) {
704 case nir_address_format_32bit_global
:
705 case nir_address_format_64bit_global
:
706 case nir_address_format_32bit_offset
:
707 assert(addr
->num_components
== 1);
708 return nir_iadd(b
, addr
, offset
);
710 case nir_address_format_64bit_bounded_global
:
711 assert(addr
->num_components
== 4);
712 return nir_vec4(b
, nir_channel(b
, addr
, 0),
713 nir_channel(b
, addr
, 1),
714 nir_channel(b
, addr
, 2),
715 nir_iadd(b
, nir_channel(b
, addr
, 3), offset
));
717 case nir_address_format_32bit_index_offset
:
718 assert(addr
->num_components
== 2);
719 return nir_vec2(b
, nir_channel(b
, addr
, 0),
720 nir_iadd(b
, nir_channel(b
, addr
, 1), offset
));
721 case nir_address_format_vec2_index_32bit_offset
:
722 assert(addr
->num_components
== 3);
723 return nir_vec3(b
, nir_channel(b
, addr
, 0), nir_channel(b
, addr
, 1),
724 nir_iadd(b
, nir_channel(b
, addr
, 2), offset
));
725 case nir_address_format_logical
:
726 unreachable("Unsupported address format");
728 unreachable("Invalid address format");
732 build_addr_iadd_imm(nir_builder
*b
, nir_ssa_def
*addr
,
733 nir_address_format addr_format
, int64_t offset
)
735 return build_addr_iadd(b
, addr
, addr_format
,
736 nir_imm_intN_t(b
, offset
, addr
->bit_size
));
740 addr_to_index(nir_builder
*b
, nir_ssa_def
*addr
,
741 nir_address_format addr_format
)
743 if (addr_format
== nir_address_format_32bit_index_offset
) {
744 assert(addr
->num_components
== 2);
745 return nir_channel(b
, addr
, 0);
746 } else if (addr_format
== nir_address_format_vec2_index_32bit_offset
) {
747 assert(addr
->num_components
== 3);
748 return nir_channels(b
, addr
, 0x3);
750 unreachable("bad address format for index");
755 addr_to_offset(nir_builder
*b
, nir_ssa_def
*addr
,
756 nir_address_format addr_format
)
758 if (addr_format
== nir_address_format_32bit_index_offset
) {
759 assert(addr
->num_components
== 2);
760 return nir_channel(b
, addr
, 1);
761 } else if (addr_format
== nir_address_format_vec2_index_32bit_offset
) {
762 assert(addr
->num_components
== 3);
763 return nir_channel(b
, addr
, 2);
765 unreachable("bad address format for offset");
769 /** Returns true if the given address format resolves to a global address */
771 addr_format_is_global(nir_address_format addr_format
)
773 return addr_format
== nir_address_format_32bit_global
||
774 addr_format
== nir_address_format_64bit_global
||
775 addr_format
== nir_address_format_64bit_bounded_global
;
779 addr_format_is_offset(nir_address_format addr_format
)
781 return addr_format
== nir_address_format_32bit_offset
;
785 addr_to_global(nir_builder
*b
, nir_ssa_def
*addr
,
786 nir_address_format addr_format
)
788 switch (addr_format
) {
789 case nir_address_format_32bit_global
:
790 case nir_address_format_64bit_global
:
791 assert(addr
->num_components
== 1);
794 case nir_address_format_64bit_bounded_global
:
795 assert(addr
->num_components
== 4);
796 return nir_iadd(b
, nir_pack_64_2x32(b
, nir_channels(b
, addr
, 0x3)),
797 nir_u2u64(b
, nir_channel(b
, addr
, 3)));
799 case nir_address_format_32bit_index_offset
:
800 case nir_address_format_vec2_index_32bit_offset
:
801 case nir_address_format_32bit_offset
:
802 case nir_address_format_logical
:
803 unreachable("Cannot get a 64-bit address with this address format");
806 unreachable("Invalid address format");
810 addr_format_needs_bounds_check(nir_address_format addr_format
)
812 return addr_format
== nir_address_format_64bit_bounded_global
;
816 addr_is_in_bounds(nir_builder
*b
, nir_ssa_def
*addr
,
817 nir_address_format addr_format
, unsigned size
)
819 assert(addr_format
== nir_address_format_64bit_bounded_global
);
820 assert(addr
->num_components
== 4);
821 return nir_ige(b
, nir_channel(b
, addr
, 2),
822 nir_iadd_imm(b
, nir_channel(b
, addr
, 3), size
));
826 build_explicit_io_load(nir_builder
*b
, nir_intrinsic_instr
*intrin
,
827 nir_ssa_def
*addr
, nir_address_format addr_format
,
828 unsigned num_components
)
830 nir_variable_mode mode
= nir_src_as_deref(intrin
->src
[0])->mode
;
834 case nir_var_mem_ubo
:
835 op
= nir_intrinsic_load_ubo
;
837 case nir_var_mem_ssbo
:
838 if (addr_format_is_global(addr_format
))
839 op
= nir_intrinsic_load_global
;
841 op
= nir_intrinsic_load_ssbo
;
843 case nir_var_mem_global
:
844 assert(addr_format_is_global(addr_format
));
845 op
= nir_intrinsic_load_global
;
847 case nir_var_shader_in
:
848 assert(addr_format_is_global(addr_format
));
849 op
= nir_intrinsic_load_kernel_input
;
851 case nir_var_mem_shared
:
852 assert(addr_format_is_offset(addr_format
));
853 op
= nir_intrinsic_load_shared
;
856 unreachable("Unsupported explicit IO variable mode");
859 nir_intrinsic_instr
*load
= nir_intrinsic_instr_create(b
->shader
, op
);
861 if (addr_format_is_global(addr_format
)) {
862 load
->src
[0] = nir_src_for_ssa(addr_to_global(b
, addr
, addr_format
));
863 } else if (addr_format
== nir_address_format_32bit_offset
) {
864 assert(addr
->num_components
== 1);
865 load
->src
[0] = nir_src_for_ssa(addr
);
867 load
->src
[0] = nir_src_for_ssa(addr_to_index(b
, addr
, addr_format
));
868 load
->src
[1] = nir_src_for_ssa(addr_to_offset(b
, addr
, addr_format
));
871 if (mode
!= nir_var_shader_in
&& mode
!= nir_var_mem_shared
)
872 nir_intrinsic_set_access(load
, nir_intrinsic_access(intrin
));
874 unsigned bit_size
= intrin
->dest
.ssa
.bit_size
;
876 /* TODO: Make the native bool bit_size an option. */
880 /* TODO: We should try and provide a better alignment. For OpenCL, we need
881 * to plumb the alignment through from SPIR-V when we have one.
883 nir_intrinsic_set_align(load
, bit_size
/ 8, 0);
885 assert(intrin
->dest
.is_ssa
);
886 load
->num_components
= num_components
;
887 nir_ssa_dest_init(&load
->instr
, &load
->dest
, num_components
,
888 bit_size
, intrin
->dest
.ssa
.name
);
890 assert(bit_size
% 8 == 0);
893 if (addr_format_needs_bounds_check(addr_format
)) {
894 /* The Vulkan spec for robustBufferAccess gives us quite a few options
895 * as to what we can do with an OOB read. Unfortunately, returning
896 * undefined values isn't one of them so we return an actual zero.
898 nir_ssa_def
*zero
= nir_imm_zero(b
, load
->num_components
, bit_size
);
900 const unsigned load_size
= (bit_size
/ 8) * load
->num_components
;
901 nir_push_if(b
, addr_is_in_bounds(b
, addr
, addr_format
, load_size
));
903 nir_builder_instr_insert(b
, &load
->instr
);
907 result
= nir_if_phi(b
, &load
->dest
.ssa
, zero
);
909 nir_builder_instr_insert(b
, &load
->instr
);
910 result
= &load
->dest
.ssa
;
913 if (intrin
->dest
.ssa
.bit_size
== 1) {
914 /* For shared, we can go ahead and use NIR's and/or the back-end's
915 * standard encoding for booleans rather than forcing a 0/1 boolean.
916 * This should save an instruction or two.
918 if (mode
== nir_var_mem_shared
)
919 result
= nir_b2b1(b
, result
);
921 result
= nir_i2b(b
, result
);
928 build_explicit_io_store(nir_builder
*b
, nir_intrinsic_instr
*intrin
,
929 nir_ssa_def
*addr
, nir_address_format addr_format
,
930 nir_ssa_def
*value
, nir_component_mask_t write_mask
)
932 nir_variable_mode mode
= nir_src_as_deref(intrin
->src
[0])->mode
;
936 case nir_var_mem_ssbo
:
937 if (addr_format_is_global(addr_format
))
938 op
= nir_intrinsic_store_global
;
940 op
= nir_intrinsic_store_ssbo
;
942 case nir_var_mem_global
:
943 assert(addr_format_is_global(addr_format
));
944 op
= nir_intrinsic_store_global
;
946 case nir_var_mem_shared
:
947 assert(addr_format_is_offset(addr_format
));
948 op
= nir_intrinsic_store_shared
;
951 unreachable("Unsupported explicit IO variable mode");
954 nir_intrinsic_instr
*store
= nir_intrinsic_instr_create(b
->shader
, op
);
956 if (value
->bit_size
== 1) {
957 /* For shared, we can go ahead and use NIR's and/or the back-end's
958 * standard encoding for booleans rather than forcing a 0/1 boolean.
959 * This should save an instruction or two.
961 * TODO: Make the native bool bit_size an option.
963 if (mode
== nir_var_mem_shared
)
964 value
= nir_b2b32(b
, value
);
966 value
= nir_b2i(b
, value
, 32);
969 store
->src
[0] = nir_src_for_ssa(value
);
970 if (addr_format_is_global(addr_format
)) {
971 store
->src
[1] = nir_src_for_ssa(addr_to_global(b
, addr
, addr_format
));
972 } else if (addr_format
== nir_address_format_32bit_offset
) {
973 assert(addr
->num_components
== 1);
974 store
->src
[1] = nir_src_for_ssa(addr
);
976 store
->src
[1] = nir_src_for_ssa(addr_to_index(b
, addr
, addr_format
));
977 store
->src
[2] = nir_src_for_ssa(addr_to_offset(b
, addr
, addr_format
));
980 nir_intrinsic_set_write_mask(store
, write_mask
);
982 if (mode
!= nir_var_mem_shared
)
983 nir_intrinsic_set_access(store
, nir_intrinsic_access(intrin
));
985 /* TODO: We should try and provide a better alignment. For OpenCL, we need
986 * to plumb the alignment through from SPIR-V when we have one.
988 nir_intrinsic_set_align(store
, value
->bit_size
/ 8, 0);
990 assert(value
->num_components
== 1 ||
991 value
->num_components
== intrin
->num_components
);
992 store
->num_components
= value
->num_components
;
994 assert(value
->bit_size
% 8 == 0);
996 if (addr_format_needs_bounds_check(addr_format
)) {
997 const unsigned store_size
= (value
->bit_size
/ 8) * store
->num_components
;
998 nir_push_if(b
, addr_is_in_bounds(b
, addr
, addr_format
, store_size
));
1000 nir_builder_instr_insert(b
, &store
->instr
);
1002 nir_pop_if(b
, NULL
);
1004 nir_builder_instr_insert(b
, &store
->instr
);
1008 static nir_ssa_def
*
1009 build_explicit_io_atomic(nir_builder
*b
, nir_intrinsic_instr
*intrin
,
1010 nir_ssa_def
*addr
, nir_address_format addr_format
)
1012 nir_variable_mode mode
= nir_src_as_deref(intrin
->src
[0])->mode
;
1013 const unsigned num_data_srcs
=
1014 nir_intrinsic_infos
[intrin
->intrinsic
].num_srcs
- 1;
1016 nir_intrinsic_op op
;
1018 case nir_var_mem_ssbo
:
1019 if (addr_format_is_global(addr_format
))
1020 op
= global_atomic_for_deref(intrin
->intrinsic
);
1022 op
= ssbo_atomic_for_deref(intrin
->intrinsic
);
1024 case nir_var_mem_global
:
1025 assert(addr_format_is_global(addr_format
));
1026 op
= global_atomic_for_deref(intrin
->intrinsic
);
1028 case nir_var_mem_shared
:
1029 assert(addr_format
== nir_address_format_32bit_offset
);
1030 op
= shared_atomic_for_deref(intrin
->intrinsic
);
1033 unreachable("Unsupported explicit IO variable mode");
1036 nir_intrinsic_instr
*atomic
= nir_intrinsic_instr_create(b
->shader
, op
);
1039 if (addr_format_is_global(addr_format
)) {
1040 atomic
->src
[src
++] = nir_src_for_ssa(addr_to_global(b
, addr
, addr_format
));
1041 } else if (addr_format
== nir_address_format_32bit_offset
) {
1042 assert(addr
->num_components
== 1);
1043 atomic
->src
[src
++] = nir_src_for_ssa(addr
);
1045 atomic
->src
[src
++] = nir_src_for_ssa(addr_to_index(b
, addr
, addr_format
));
1046 atomic
->src
[src
++] = nir_src_for_ssa(addr_to_offset(b
, addr
, addr_format
));
1048 for (unsigned i
= 0; i
< num_data_srcs
; i
++) {
1049 atomic
->src
[src
++] = nir_src_for_ssa(intrin
->src
[1 + i
].ssa
);
1052 /* Global atomics don't have access flags because they assume that the
1053 * address may be non-uniform.
1055 if (!addr_format_is_global(addr_format
) && mode
!= nir_var_mem_shared
)
1056 nir_intrinsic_set_access(atomic
, nir_intrinsic_access(intrin
));
1058 assert(intrin
->dest
.ssa
.num_components
== 1);
1059 nir_ssa_dest_init(&atomic
->instr
, &atomic
->dest
,
1060 1, intrin
->dest
.ssa
.bit_size
, intrin
->dest
.ssa
.name
);
1062 assert(atomic
->dest
.ssa
.bit_size
% 8 == 0);
1064 if (addr_format_needs_bounds_check(addr_format
)) {
1065 const unsigned atomic_size
= atomic
->dest
.ssa
.bit_size
/ 8;
1066 nir_push_if(b
, addr_is_in_bounds(b
, addr
, addr_format
, atomic_size
));
1068 nir_builder_instr_insert(b
, &atomic
->instr
);
1070 nir_pop_if(b
, NULL
);
1071 return nir_if_phi(b
, &atomic
->dest
.ssa
,
1072 nir_ssa_undef(b
, 1, atomic
->dest
.ssa
.bit_size
));
1074 nir_builder_instr_insert(b
, &atomic
->instr
);
1075 return &atomic
->dest
.ssa
;
1080 nir_explicit_io_address_from_deref(nir_builder
*b
, nir_deref_instr
*deref
,
1081 nir_ssa_def
*base_addr
,
1082 nir_address_format addr_format
)
1084 assert(deref
->dest
.is_ssa
);
1085 switch (deref
->deref_type
) {
1086 case nir_deref_type_var
:
1087 assert(deref
->mode
& (nir_var_shader_in
| nir_var_mem_shared
));
1088 return nir_imm_intN_t(b
, deref
->var
->data
.driver_location
,
1089 deref
->dest
.ssa
.bit_size
);
1091 case nir_deref_type_array
: {
1092 nir_deref_instr
*parent
= nir_deref_instr_parent(deref
);
1094 unsigned stride
= glsl_get_explicit_stride(parent
->type
);
1095 if ((glsl_type_is_matrix(parent
->type
) &&
1096 glsl_matrix_type_is_row_major(parent
->type
)) ||
1097 (glsl_type_is_vector(parent
->type
) && stride
== 0))
1098 stride
= type_scalar_size_bytes(parent
->type
);
1102 nir_ssa_def
*index
= nir_ssa_for_src(b
, deref
->arr
.index
, 1);
1103 index
= nir_i2i(b
, index
, base_addr
->bit_size
);
1104 return build_addr_iadd(b
, base_addr
, addr_format
,
1105 nir_amul_imm(b
, index
, stride
));
1108 case nir_deref_type_ptr_as_array
: {
1109 nir_ssa_def
*index
= nir_ssa_for_src(b
, deref
->arr
.index
, 1);
1110 index
= nir_i2i(b
, index
, base_addr
->bit_size
);
1111 unsigned stride
= nir_deref_instr_ptr_as_array_stride(deref
);
1112 return build_addr_iadd(b
, base_addr
, addr_format
,
1113 nir_amul_imm(b
, index
, stride
));
1116 case nir_deref_type_array_wildcard
:
1117 unreachable("Wildcards should be lowered by now");
1120 case nir_deref_type_struct
: {
1121 nir_deref_instr
*parent
= nir_deref_instr_parent(deref
);
1122 int offset
= glsl_get_struct_field_offset(parent
->type
,
1123 deref
->strct
.index
);
1124 assert(offset
>= 0);
1125 return build_addr_iadd_imm(b
, base_addr
, addr_format
, offset
);
1128 case nir_deref_type_cast
:
1129 /* Nothing to do here */
1133 unreachable("Invalid NIR deref type");
1137 nir_lower_explicit_io_instr(nir_builder
*b
,
1138 nir_intrinsic_instr
*intrin
,
1140 nir_address_format addr_format
)
1142 b
->cursor
= nir_after_instr(&intrin
->instr
);
1144 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
1145 unsigned vec_stride
= glsl_get_explicit_stride(deref
->type
);
1146 unsigned scalar_size
= type_scalar_size_bytes(deref
->type
);
1147 assert(vec_stride
== 0 || glsl_type_is_vector(deref
->type
));
1148 assert(vec_stride
== 0 || vec_stride
>= scalar_size
);
1150 if (intrin
->intrinsic
== nir_intrinsic_load_deref
) {
1152 if (vec_stride
> scalar_size
) {
1153 nir_ssa_def
*comps
[4] = { NULL
, };
1154 for (unsigned i
= 0; i
< intrin
->num_components
; i
++) {
1155 nir_ssa_def
*comp_addr
= build_addr_iadd_imm(b
, addr
, addr_format
,
1157 comps
[i
] = build_explicit_io_load(b
, intrin
, comp_addr
,
1160 value
= nir_vec(b
, comps
, intrin
->num_components
);
1162 value
= build_explicit_io_load(b
, intrin
, addr
, addr_format
,
1163 intrin
->num_components
);
1165 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
, nir_src_for_ssa(value
));
1166 } else if (intrin
->intrinsic
== nir_intrinsic_store_deref
) {
1167 assert(intrin
->src
[1].is_ssa
);
1168 nir_ssa_def
*value
= intrin
->src
[1].ssa
;
1169 nir_component_mask_t write_mask
= nir_intrinsic_write_mask(intrin
);
1170 if (vec_stride
> scalar_size
) {
1171 for (unsigned i
= 0; i
< intrin
->num_components
; i
++) {
1172 if (!(write_mask
& (1 << i
)))
1175 nir_ssa_def
*comp_addr
= build_addr_iadd_imm(b
, addr
, addr_format
,
1177 build_explicit_io_store(b
, intrin
, comp_addr
, addr_format
,
1178 nir_channel(b
, value
, i
), 1);
1181 build_explicit_io_store(b
, intrin
, addr
, addr_format
,
1185 nir_ssa_def
*value
=
1186 build_explicit_io_atomic(b
, intrin
, addr
, addr_format
);
1187 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
, nir_src_for_ssa(value
));
1190 nir_instr_remove(&intrin
->instr
);
1194 lower_explicit_io_deref(nir_builder
*b
, nir_deref_instr
*deref
,
1195 nir_address_format addr_format
)
1197 /* Just delete the deref if it's not used. We can't use
1198 * nir_deref_instr_remove_if_unused here because it may remove more than
1199 * one deref which could break our list walking since we walk the list
1202 assert(list_is_empty(&deref
->dest
.ssa
.if_uses
));
1203 if (list_is_empty(&deref
->dest
.ssa
.uses
)) {
1204 nir_instr_remove(&deref
->instr
);
1208 b
->cursor
= nir_after_instr(&deref
->instr
);
1210 nir_ssa_def
*base_addr
= NULL
;
1211 if (deref
->deref_type
!= nir_deref_type_var
) {
1212 assert(deref
->parent
.is_ssa
);
1213 base_addr
= deref
->parent
.ssa
;
1216 nir_ssa_def
*addr
= nir_explicit_io_address_from_deref(b
, deref
, base_addr
,
1219 nir_instr_remove(&deref
->instr
);
1220 nir_ssa_def_rewrite_uses(&deref
->dest
.ssa
, nir_src_for_ssa(addr
));
1224 lower_explicit_io_access(nir_builder
*b
, nir_intrinsic_instr
*intrin
,
1225 nir_address_format addr_format
)
1227 assert(intrin
->src
[0].is_ssa
);
1228 nir_lower_explicit_io_instr(b
, intrin
, intrin
->src
[0].ssa
, addr_format
);
1232 lower_explicit_io_array_length(nir_builder
*b
, nir_intrinsic_instr
*intrin
,
1233 nir_address_format addr_format
)
1235 b
->cursor
= nir_after_instr(&intrin
->instr
);
1237 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
1239 assert(glsl_type_is_array(deref
->type
));
1240 assert(glsl_get_length(deref
->type
) == 0);
1241 unsigned stride
= glsl_get_explicit_stride(deref
->type
);
1244 assert(addr_format
== nir_address_format_32bit_index_offset
||
1245 addr_format
== nir_address_format_vec2_index_32bit_offset
);
1246 nir_ssa_def
*addr
= &deref
->dest
.ssa
;
1247 nir_ssa_def
*index
= addr_to_index(b
, addr
, addr_format
);
1248 nir_ssa_def
*offset
= addr_to_offset(b
, addr
, addr_format
);
1250 nir_intrinsic_instr
*bsize
=
1251 nir_intrinsic_instr_create(b
->shader
, nir_intrinsic_get_buffer_size
);
1252 bsize
->src
[0] = nir_src_for_ssa(index
);
1253 nir_ssa_dest_init(&bsize
->instr
, &bsize
->dest
, 1, 32, NULL
);
1254 nir_builder_instr_insert(b
, &bsize
->instr
);
1256 nir_ssa_def
*arr_size
=
1257 nir_idiv(b
, nir_isub(b
, &bsize
->dest
.ssa
, offset
),
1258 nir_imm_int(b
, stride
));
1260 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
, nir_src_for_ssa(arr_size
));
1261 nir_instr_remove(&intrin
->instr
);
1265 nir_lower_explicit_io_impl(nir_function_impl
*impl
, nir_variable_mode modes
,
1266 nir_address_format addr_format
)
1268 bool progress
= false;
1271 nir_builder_init(&b
, impl
);
1273 /* Walk in reverse order so that we can see the full deref chain when we
1274 * lower the access operations. We lower them assuming that the derefs
1275 * will be turned into address calculations later.
1277 nir_foreach_block_reverse(block
, impl
) {
1278 nir_foreach_instr_reverse_safe(instr
, block
) {
1279 switch (instr
->type
) {
1280 case nir_instr_type_deref
: {
1281 nir_deref_instr
*deref
= nir_instr_as_deref(instr
);
1282 if (deref
->mode
& modes
) {
1283 lower_explicit_io_deref(&b
, deref
, addr_format
);
1289 case nir_instr_type_intrinsic
: {
1290 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
1291 switch (intrin
->intrinsic
) {
1292 case nir_intrinsic_load_deref
:
1293 case nir_intrinsic_store_deref
:
1294 case nir_intrinsic_deref_atomic_add
:
1295 case nir_intrinsic_deref_atomic_imin
:
1296 case nir_intrinsic_deref_atomic_umin
:
1297 case nir_intrinsic_deref_atomic_imax
:
1298 case nir_intrinsic_deref_atomic_umax
:
1299 case nir_intrinsic_deref_atomic_and
:
1300 case nir_intrinsic_deref_atomic_or
:
1301 case nir_intrinsic_deref_atomic_xor
:
1302 case nir_intrinsic_deref_atomic_exchange
:
1303 case nir_intrinsic_deref_atomic_comp_swap
:
1304 case nir_intrinsic_deref_atomic_fadd
:
1305 case nir_intrinsic_deref_atomic_fmin
:
1306 case nir_intrinsic_deref_atomic_fmax
:
1307 case nir_intrinsic_deref_atomic_fcomp_swap
: {
1308 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
1309 if (deref
->mode
& modes
) {
1310 lower_explicit_io_access(&b
, intrin
, addr_format
);
1316 case nir_intrinsic_deref_buffer_array_length
: {
1317 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
1318 if (deref
->mode
& modes
) {
1319 lower_explicit_io_array_length(&b
, intrin
, addr_format
);
1339 nir_metadata_preserve(impl
, nir_metadata_block_index
|
1340 nir_metadata_dominance
);
1346 /** Lower explicitly laid out I/O access to byte offset/address intrinsics
1348 * This pass is intended to be used for any I/O which touches memory external
1349 * to the shader or which is directly visible to the client. It requires that
1350 * all data types in the given modes have a explicit stride/offset decorations
1351 * to tell it exactly how to calculate the offset/address for the given load,
1352 * store, or atomic operation. If the offset/stride information does not come
1353 * from the client explicitly (as with shared variables in GL or Vulkan),
1354 * nir_lower_vars_to_explicit_types() can be used to add them.
1356 * Unlike nir_lower_io, this pass is fully capable of handling incomplete
1357 * pointer chains which may contain cast derefs. It does so by walking the
1358 * deref chain backwards and simply replacing each deref, one at a time, with
1359 * the appropriate address calculation. The pass takes a nir_address_format
1360 * parameter which describes how the offset or address is to be represented
1361 * during calculations. By ensuring that the address is always in a
1362 * consistent format, pointers can safely be conjured from thin air by the
1363 * driver, stored to variables, passed through phis, etc.
1365 * The one exception to the simple algorithm described above is for handling
1366 * row-major matrices in which case we may look down one additional level of
1370 nir_lower_explicit_io(nir_shader
*shader
, nir_variable_mode modes
,
1371 nir_address_format addr_format
)
1373 bool progress
= false;
1375 nir_foreach_function(function
, shader
) {
1376 if (function
->impl
&&
1377 nir_lower_explicit_io_impl(function
->impl
, modes
, addr_format
))
1385 nir_lower_vars_to_explicit_types_impl(nir_function_impl
*impl
,
1386 nir_variable_mode modes
,
1387 glsl_type_size_align_func type_info
)
1389 bool progress
= false;
1391 nir_foreach_block(block
, impl
) {
1392 nir_foreach_instr(instr
, block
) {
1393 if (instr
->type
!= nir_instr_type_deref
)
1396 nir_deref_instr
*deref
= nir_instr_as_deref(instr
);
1397 if (!(deref
->mode
& modes
))
1400 unsigned size
, alignment
;
1401 const struct glsl_type
*new_type
=
1402 glsl_get_explicit_type_for_size_align(deref
->type
, type_info
, &size
, &alignment
);
1403 if (new_type
!= deref
->type
) {
1405 deref
->type
= new_type
;
1407 if (deref
->deref_type
== nir_deref_type_cast
) {
1408 /* See also glsl_type::get_explicit_type_for_size_align() */
1409 unsigned new_stride
= align(size
, alignment
);
1410 if (new_stride
!= deref
->cast
.ptr_stride
) {
1411 deref
->cast
.ptr_stride
= new_stride
;
1419 nir_metadata_preserve(impl
, nir_metadata_block_index
|
1420 nir_metadata_dominance
|
1421 nir_metadata_live_ssa_defs
|
1422 nir_metadata_loop_analysis
);
1429 lower_vars_to_explicit(nir_shader
*shader
,
1430 struct exec_list
*vars
, nir_variable_mode mode
,
1431 glsl_type_size_align_func type_info
)
1433 bool progress
= false;
1434 unsigned offset
= 0;
1435 nir_foreach_variable(var
, vars
) {
1436 unsigned size
, align
;
1437 const struct glsl_type
*explicit_type
=
1438 glsl_get_explicit_type_for_size_align(var
->type
, type_info
, &size
, &align
);
1440 if (explicit_type
!= var
->type
) {
1442 var
->type
= explicit_type
;
1445 var
->data
.driver_location
= ALIGN_POT(offset
, align
);
1446 offset
= var
->data
.driver_location
+ size
;
1449 if (mode
== nir_var_mem_shared
) {
1450 shader
->info
.cs
.shared_size
= offset
;
1451 shader
->num_shared
= offset
;
1458 nir_lower_vars_to_explicit_types(nir_shader
*shader
,
1459 nir_variable_mode modes
,
1460 glsl_type_size_align_func type_info
)
1462 /* TODO: Situations which need to be handled to support more modes:
1463 * - row-major matrices
1464 * - compact shader inputs/outputs
1467 ASSERTED nir_variable_mode supported
= nir_var_mem_shared
|
1468 nir_var_shader_temp
| nir_var_function_temp
;
1469 assert(!(modes
& ~supported
) && "unsupported");
1471 bool progress
= false;
1473 if (modes
& nir_var_mem_shared
)
1474 progress
|= lower_vars_to_explicit(shader
, &shader
->shared
, nir_var_mem_shared
, type_info
);
1475 if (modes
& nir_var_shader_temp
)
1476 progress
|= lower_vars_to_explicit(shader
, &shader
->globals
, nir_var_shader_temp
, type_info
);
1478 nir_foreach_function(function
, shader
) {
1479 if (function
->impl
) {
1480 if (modes
& nir_var_function_temp
)
1481 progress
|= lower_vars_to_explicit(shader
, &function
->impl
->locals
, nir_var_function_temp
, type_info
);
1483 progress
|= nir_lower_vars_to_explicit_types_impl(function
->impl
, modes
, type_info
);
1491 * Return the offset source for a load/store intrinsic.
1494 nir_get_io_offset_src(nir_intrinsic_instr
*instr
)
1496 switch (instr
->intrinsic
) {
1497 case nir_intrinsic_load_input
:
1498 case nir_intrinsic_load_output
:
1499 case nir_intrinsic_load_shared
:
1500 case nir_intrinsic_load_uniform
:
1501 case nir_intrinsic_load_global
:
1502 case nir_intrinsic_load_scratch
:
1503 case nir_intrinsic_load_fs_input_interp_deltas
:
1504 return &instr
->src
[0];
1505 case nir_intrinsic_load_ubo
:
1506 case nir_intrinsic_load_ssbo
:
1507 case nir_intrinsic_load_per_vertex_input
:
1508 case nir_intrinsic_load_per_vertex_output
:
1509 case nir_intrinsic_load_interpolated_input
:
1510 case nir_intrinsic_store_output
:
1511 case nir_intrinsic_store_shared
:
1512 case nir_intrinsic_store_global
:
1513 case nir_intrinsic_store_scratch
:
1514 case nir_intrinsic_ssbo_atomic_add
:
1515 case nir_intrinsic_ssbo_atomic_imin
:
1516 case nir_intrinsic_ssbo_atomic_umin
:
1517 case nir_intrinsic_ssbo_atomic_imax
:
1518 case nir_intrinsic_ssbo_atomic_umax
:
1519 case nir_intrinsic_ssbo_atomic_and
:
1520 case nir_intrinsic_ssbo_atomic_or
:
1521 case nir_intrinsic_ssbo_atomic_xor
:
1522 case nir_intrinsic_ssbo_atomic_exchange
:
1523 case nir_intrinsic_ssbo_atomic_comp_swap
:
1524 case nir_intrinsic_ssbo_atomic_fadd
:
1525 case nir_intrinsic_ssbo_atomic_fmin
:
1526 case nir_intrinsic_ssbo_atomic_fmax
:
1527 case nir_intrinsic_ssbo_atomic_fcomp_swap
:
1528 return &instr
->src
[1];
1529 case nir_intrinsic_store_ssbo
:
1530 case nir_intrinsic_store_per_vertex_output
:
1531 return &instr
->src
[2];
1538 * Return the vertex index source for a load/store per_vertex intrinsic.
1541 nir_get_io_vertex_index_src(nir_intrinsic_instr
*instr
)
1543 switch (instr
->intrinsic
) {
1544 case nir_intrinsic_load_per_vertex_input
:
1545 case nir_intrinsic_load_per_vertex_output
:
1546 return &instr
->src
[0];
1547 case nir_intrinsic_store_per_vertex_output
:
1548 return &instr
->src
[1];
1555 * Return the numeric constant that identify a NULL pointer for each address
1558 const nir_const_value
*
1559 nir_address_format_null_value(nir_address_format addr_format
)
1561 const static nir_const_value null_values
[][NIR_MAX_VEC_COMPONENTS
] = {
1562 [nir_address_format_32bit_global
] = {{0}},
1563 [nir_address_format_64bit_global
] = {{0}},
1564 [nir_address_format_64bit_bounded_global
] = {{0}},
1565 [nir_address_format_32bit_index_offset
] = {{.u32
= ~0}, {.u32
= ~0}},
1566 [nir_address_format_vec2_index_32bit_offset
] = {{.u32
= ~0}, {.u32
= ~0}, {.u32
= ~0}},
1567 [nir_address_format_32bit_offset
] = {{.u32
= ~0}},
1568 [nir_address_format_logical
] = {{.u32
= ~0}},
1571 assert(addr_format
< ARRAY_SIZE(null_values
));
1572 return null_values
[addr_format
];
1576 nir_build_addr_ieq(nir_builder
*b
, nir_ssa_def
*addr0
, nir_ssa_def
*addr1
,
1577 nir_address_format addr_format
)
1579 switch (addr_format
) {
1580 case nir_address_format_32bit_global
:
1581 case nir_address_format_64bit_global
:
1582 case nir_address_format_64bit_bounded_global
:
1583 case nir_address_format_32bit_index_offset
:
1584 case nir_address_format_vec2_index_32bit_offset
:
1585 case nir_address_format_32bit_offset
:
1586 return nir_ball_iequal(b
, addr0
, addr1
);
1588 case nir_address_format_logical
:
1589 unreachable("Unsupported address format");
1592 unreachable("Invalid address format");
1596 nir_build_addr_isub(nir_builder
*b
, nir_ssa_def
*addr0
, nir_ssa_def
*addr1
,
1597 nir_address_format addr_format
)
1599 switch (addr_format
) {
1600 case nir_address_format_32bit_global
:
1601 case nir_address_format_64bit_global
:
1602 case nir_address_format_32bit_offset
:
1603 assert(addr0
->num_components
== 1);
1604 assert(addr1
->num_components
== 1);
1605 return nir_isub(b
, addr0
, addr1
);
1607 case nir_address_format_64bit_bounded_global
:
1608 return nir_isub(b
, addr_to_global(b
, addr0
, addr_format
),
1609 addr_to_global(b
, addr1
, addr_format
));
1611 case nir_address_format_32bit_index_offset
:
1612 assert(addr0
->num_components
== 2);
1613 assert(addr1
->num_components
== 2);
1614 /* Assume the same buffer index. */
1615 return nir_isub(b
, nir_channel(b
, addr0
, 1), nir_channel(b
, addr1
, 1));
1617 case nir_address_format_vec2_index_32bit_offset
:
1618 assert(addr0
->num_components
== 3);
1619 assert(addr1
->num_components
== 3);
1620 /* Assume the same buffer index. */
1621 return nir_isub(b
, nir_channel(b
, addr0
, 2), nir_channel(b
, addr1
, 2));
1623 case nir_address_format_logical
:
1624 unreachable("Unsupported address format");
1627 unreachable("Invalid address format");
1631 is_input(nir_intrinsic_instr
*intrin
)
1633 return intrin
->intrinsic
== nir_intrinsic_load_input
||
1634 intrin
->intrinsic
== nir_intrinsic_load_per_vertex_input
||
1635 intrin
->intrinsic
== nir_intrinsic_load_interpolated_input
||
1636 intrin
->intrinsic
== nir_intrinsic_load_fs_input_interp_deltas
;
1640 is_output(nir_intrinsic_instr
*intrin
)
1642 return intrin
->intrinsic
== nir_intrinsic_load_output
||
1643 intrin
->intrinsic
== nir_intrinsic_load_per_vertex_output
||
1644 intrin
->intrinsic
== nir_intrinsic_store_output
||
1645 intrin
->intrinsic
== nir_intrinsic_store_per_vertex_output
;
1650 * This pass adds constant offsets to instr->const_index[0] for input/output
1651 * intrinsics, and resets the offset source to 0. Non-constant offsets remain
1652 * unchanged - since we don't know what part of a compound variable is
1653 * accessed, we allocate storage for the entire thing. For drivers that use
1654 * nir_lower_io_to_temporaries() before nir_lower_io(), this guarantees that
1655 * the offset source will be 0, so that they don't have to add it in manually.
1659 add_const_offset_to_base_block(nir_block
*block
, nir_builder
*b
,
1660 nir_variable_mode mode
)
1662 bool progress
= false;
1663 nir_foreach_instr_safe(instr
, block
) {
1664 if (instr
->type
!= nir_instr_type_intrinsic
)
1667 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
1669 if ((mode
== nir_var_shader_in
&& is_input(intrin
)) ||
1670 (mode
== nir_var_shader_out
&& is_output(intrin
))) {
1671 nir_src
*offset
= nir_get_io_offset_src(intrin
);
1673 if (nir_src_is_const(*offset
)) {
1674 intrin
->const_index
[0] += nir_src_as_uint(*offset
);
1675 b
->cursor
= nir_before_instr(&intrin
->instr
);
1676 nir_instr_rewrite_src(&intrin
->instr
, offset
,
1677 nir_src_for_ssa(nir_imm_int(b
, 0)));
1687 nir_io_add_const_offset_to_base(nir_shader
*nir
, nir_variable_mode mode
)
1689 bool progress
= false;
1691 nir_foreach_function(f
, nir
) {
1694 nir_builder_init(&b
, f
->impl
);
1695 nir_foreach_block(block
, f
->impl
) {
1696 progress
|= add_const_offset_to_base_block(block
, &b
, mode
);