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629a97cdf351cdcc477cc67c9e601c36f0d40759
[mesa.git] / src / gallium / drivers / radeonsi / si_shader_nir.c
1 /*
2 * Copyright 2017 Advanced Micro Devices, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include "ac_nir_to_llvm.h"
26 #include "compiler/nir/nir.h"
27 #include "compiler/nir/nir_builder.h"
28 #include "compiler/nir/nir_deref.h"
29 #include "compiler/nir_types.h"
30 #include "si_pipe.h"
31 #include "si_shader_internal.h"
32 #include "tgsi/tgsi_from_mesa.h"
33
34 static const nir_deref_instr *tex_get_texture_deref(nir_tex_instr *instr)
35 {
36 for (unsigned i = 0; i < instr->num_srcs; i++) {
37 switch (instr->src[i].src_type) {
38 case nir_tex_src_texture_deref:
39 return nir_src_as_deref(instr->src[i].src);
40 default:
41 break;
42 }
43 }
44
45 return NULL;
46 }
47
48 static void scan_io_usage(struct si_shader_info *info, nir_intrinsic_instr *intr,
49 bool is_input)
50 {
51 unsigned interp = INTERP_MODE_FLAT; /* load_input uses flat shading */
52
53 if (intr->intrinsic == nir_intrinsic_load_interpolated_input) {
54 nir_intrinsic_instr *baryc = nir_instr_as_intrinsic(intr->src[0].ssa->parent_instr);
55
56 if (baryc) {
57 if (nir_intrinsic_infos[baryc->intrinsic].index_map[NIR_INTRINSIC_INTERP_MODE] > 0)
58 interp = nir_intrinsic_interp_mode(baryc);
59 else
60 unreachable("unknown barycentric intrinsic");
61 } else {
62 unreachable("unknown barycentric expression");
63 }
64 }
65
66 unsigned mask, bit_size;
67 bool dual_slot, is_output_load;
68
69 if (nir_intrinsic_infos[intr->intrinsic].index_map[NIR_INTRINSIC_WRMASK] > 0) {
70 mask = nir_intrinsic_write_mask(intr); /* store */
71 bit_size = nir_src_bit_size(intr->src[0]);
72 dual_slot = bit_size == 64 && nir_src_num_components(intr->src[0]) >= 3;
73 is_output_load = false;
74 } else {
75 mask = nir_ssa_def_components_read(&intr->dest.ssa); /* load */
76 bit_size = intr->dest.ssa.bit_size;
77 dual_slot = bit_size == 64 && intr->dest.ssa.num_components >= 3;
78 is_output_load = !is_input;
79 }
80
81 /* Convert the 64-bit component mask to a 32-bit component mask. */
82 if (bit_size == 64) {
83 unsigned new_mask = 0;
84 for (unsigned i = 0; i < 4; i++) {
85 if (mask & (1 << i))
86 new_mask |= 0x3 << (2 * i);
87 }
88 mask = new_mask;
89 }
90
91 /* Convert the 16-bit component mask to a 32-bit component mask. */
92 if (bit_size == 16) {
93 unsigned new_mask = 0;
94 for (unsigned i = 0; i < 4; i++) {
95 if (mask & (1 << i))
96 new_mask |= 0x1 << (i / 2);
97 }
98 mask = new_mask;
99 }
100
101 mask <<= nir_intrinsic_component(intr);
102
103 nir_src offset = *nir_get_io_offset_src(intr);
104 bool indirect = !nir_src_is_const(offset);
105 if (!indirect)
106 assert(nir_src_as_uint(offset) == 0);
107
108 unsigned semantic = 0;
109 /* VS doesn't have semantics. */
110 if (info->stage != MESA_SHADER_VERTEX || !is_input)
111 semantic = nir_intrinsic_io_semantics(intr).location;
112
113 if (info->stage == MESA_SHADER_FRAGMENT && !is_input) {
114 /* Never use FRAG_RESULT_COLOR directly. */
115 if (semantic == FRAG_RESULT_COLOR) {
116 semantic = FRAG_RESULT_DATA0;
117 info->properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS] = true;
118 }
119 semantic += nir_intrinsic_io_semantics(intr).dual_source_blend_index;
120 }
121
122 unsigned driver_location = nir_intrinsic_base(intr);
123 unsigned num_slots = indirect ? nir_intrinsic_io_semantics(intr).num_slots : (1 + dual_slot);
124
125 if (is_input) {
126 assert(driver_location + num_slots <= ARRAY_SIZE(info->input_usage_mask));
127
128 for (unsigned i = 0; i < num_slots; i++) {
129 unsigned loc = driver_location + i;
130 unsigned slot_mask = (dual_slot && i % 2 ? mask >> 4 : mask) & 0xf;
131
132 info->input_semantic[loc] = semantic + i;
133 info->input_interpolate[loc] = interp;
134
135 if (slot_mask) {
136 info->input_usage_mask[loc] |= slot_mask;
137 info->num_inputs = MAX2(info->num_inputs, loc + 1);
138
139 if (semantic == VARYING_SLOT_PRIMITIVE_ID)
140 info->uses_primid = true;
141 }
142 }
143 } else {
144 /* Outputs. */
145 assert(driver_location + num_slots <= ARRAY_SIZE(info->output_usagemask));
146 assert(semantic + num_slots < ARRAY_SIZE(info->output_semantic_to_slot));
147
148 for (unsigned i = 0; i < num_slots; i++) {
149 unsigned loc = driver_location + i;
150 unsigned slot_mask = (dual_slot && i % 2 ? mask >> 4 : mask) & 0xf;
151
152 info->output_semantic[loc] = semantic + i;
153 info->output_semantic_to_slot[semantic + i] = loc;
154
155 if (is_output_load) {
156 /* Output loads have only a few things that we need to track. */
157 info->output_readmask[loc] |= slot_mask;
158
159 if (info->stage == MESA_SHADER_FRAGMENT &&
160 nir_intrinsic_io_semantics(intr).fb_fetch_output)
161 info->uses_fbfetch = true;
162 } else if (slot_mask) {
163 /* Output stores. */
164 if (info->stage == MESA_SHADER_GEOMETRY) {
165 unsigned gs_streams = (uint32_t)nir_intrinsic_io_semantics(intr).gs_streams <<
166 (nir_intrinsic_component(intr) * 2);
167 unsigned new_mask = slot_mask & ~info->output_usagemask[loc];
168
169 for (unsigned i = 0; i < 4; i++) {
170 unsigned stream = (gs_streams >> (i * 2)) & 0x3;
171
172 if (new_mask & (1 << i)) {
173 info->output_streams[loc] |= stream << (i * 2);
174 info->num_stream_output_components[stream]++;
175 }
176 }
177 }
178
179 info->output_usagemask[loc] |= slot_mask;
180 info->num_outputs = MAX2(info->num_outputs, loc + 1);
181
182 if (info->stage == MESA_SHADER_FRAGMENT) {
183 switch (semantic) {
184 case FRAG_RESULT_DEPTH:
185 info->writes_z = true;
186 break;
187 case FRAG_RESULT_STENCIL:
188 info->writes_stencil = true;
189 break;
190 case FRAG_RESULT_SAMPLE_MASK:
191 info->writes_samplemask = true;
192 break;
193 default:
194 if (semantic >= FRAG_RESULT_DATA0 && semantic <= FRAG_RESULT_DATA7) {
195 unsigned index = semantic - FRAG_RESULT_DATA0;
196 info->colors_written |= 1 << (index + i);
197 }
198 break;
199 }
200 } else {
201 switch (semantic) {
202 case VARYING_SLOT_PRIMITIVE_ID:
203 info->writes_primid = true;
204 break;
205 case VARYING_SLOT_VIEWPORT:
206 info->writes_viewport_index = true;
207 break;
208 case VARYING_SLOT_LAYER:
209 info->writes_layer = true;
210 break;
211 case VARYING_SLOT_PSIZ:
212 info->writes_psize = true;
213 break;
214 case VARYING_SLOT_CLIP_VERTEX:
215 info->writes_clipvertex = true;
216 break;
217 case VARYING_SLOT_EDGE:
218 info->writes_edgeflag = true;
219 break;
220 case VARYING_SLOT_POS:
221 info->writes_position = true;
222 break;
223 }
224 }
225 }
226 }
227 }
228 }
229
230 static void scan_instruction(const struct nir_shader *nir, struct si_shader_info *info,
231 nir_instr *instr)
232 {
233 if (instr->type == nir_instr_type_alu) {
234 nir_alu_instr *alu = nir_instr_as_alu(instr);
235
236 switch (alu->op) {
237 case nir_op_fddx:
238 case nir_op_fddy:
239 case nir_op_fddx_fine:
240 case nir_op_fddy_fine:
241 case nir_op_fddx_coarse:
242 case nir_op_fddy_coarse:
243 info->uses_derivatives = true;
244 break;
245 default:
246 break;
247 }
248 } else if (instr->type == nir_instr_type_tex) {
249 nir_tex_instr *tex = nir_instr_as_tex(instr);
250 const nir_deref_instr *deref = tex_get_texture_deref(tex);
251 nir_variable *var = deref ? nir_deref_instr_get_variable(deref) : NULL;
252
253 if (!var) {
254 info->samplers_declared |= u_bit_consecutive(tex->sampler_index, 1);
255 } else {
256 if (deref->mode != nir_var_uniform || var->data.bindless)
257 info->uses_bindless_samplers = true;
258 }
259
260 switch (tex->op) {
261 case nir_texop_tex:
262 case nir_texop_txb:
263 case nir_texop_lod:
264 info->uses_derivatives = true;
265 break;
266 default:
267 break;
268 }
269 } else if (instr->type == nir_instr_type_intrinsic) {
270 nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
271
272 switch (intr->intrinsic) {
273 case nir_intrinsic_load_front_face:
274 info->uses_frontface = 1;
275 break;
276 case nir_intrinsic_load_instance_id:
277 info->uses_instanceid = 1;
278 break;
279 case nir_intrinsic_load_invocation_id:
280 info->uses_invocationid = true;
281 break;
282 case nir_intrinsic_load_num_work_groups:
283 info->uses_grid_size = true;
284 break;
285 case nir_intrinsic_load_local_invocation_index:
286 case nir_intrinsic_load_subgroup_id:
287 case nir_intrinsic_load_num_subgroups:
288 info->uses_subgroup_info = true;
289 break;
290 case nir_intrinsic_load_local_group_size:
291 /* The block size is translated to IMM with a fixed block size. */
292 if (info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] == 0)
293 info->uses_block_size = true;
294 break;
295 case nir_intrinsic_load_local_invocation_id:
296 case nir_intrinsic_load_work_group_id: {
297 unsigned mask = nir_ssa_def_components_read(&intr->dest.ssa);
298 while (mask) {
299 unsigned i = u_bit_scan(&mask);
300
301 if (intr->intrinsic == nir_intrinsic_load_work_group_id)
302 info->uses_block_id[i] = true;
303 else
304 info->uses_thread_id[i] = true;
305 }
306 break;
307 }
308 case nir_intrinsic_load_vertex_id:
309 info->uses_vertexid = 1;
310 break;
311 case nir_intrinsic_load_vertex_id_zero_base:
312 info->uses_vertexid_nobase = 1;
313 break;
314 case nir_intrinsic_load_base_vertex:
315 info->uses_basevertex = 1;
316 break;
317 case nir_intrinsic_load_draw_id:
318 info->uses_drawid = 1;
319 break;
320 case nir_intrinsic_load_primitive_id:
321 info->uses_primid = 1;
322 break;
323 case nir_intrinsic_load_sample_mask_in:
324 info->reads_samplemask = true;
325 break;
326 case nir_intrinsic_load_tess_level_inner:
327 case nir_intrinsic_load_tess_level_outer:
328 info->reads_tess_factors = true;
329 break;
330 case nir_intrinsic_bindless_image_load:
331 case nir_intrinsic_bindless_image_size:
332 case nir_intrinsic_bindless_image_samples:
333 info->uses_bindless_images = true;
334 break;
335 case nir_intrinsic_bindless_image_store:
336 info->uses_bindless_images = true;
337 info->writes_memory = true;
338 info->num_memory_instructions++; /* we only care about stores */
339 break;
340 case nir_intrinsic_image_deref_store:
341 info->writes_memory = true;
342 info->num_memory_instructions++; /* we only care about stores */
343 break;
344 case nir_intrinsic_bindless_image_atomic_add:
345 case nir_intrinsic_bindless_image_atomic_imin:
346 case nir_intrinsic_bindless_image_atomic_umin:
347 case nir_intrinsic_bindless_image_atomic_imax:
348 case nir_intrinsic_bindless_image_atomic_umax:
349 case nir_intrinsic_bindless_image_atomic_and:
350 case nir_intrinsic_bindless_image_atomic_or:
351 case nir_intrinsic_bindless_image_atomic_xor:
352 case nir_intrinsic_bindless_image_atomic_exchange:
353 case nir_intrinsic_bindless_image_atomic_comp_swap:
354 info->uses_bindless_images = true;
355 info->writes_memory = true;
356 info->num_memory_instructions++; /* we only care about stores */
357 break;
358 case nir_intrinsic_image_deref_atomic_add:
359 case nir_intrinsic_image_deref_atomic_imin:
360 case nir_intrinsic_image_deref_atomic_umin:
361 case nir_intrinsic_image_deref_atomic_imax:
362 case nir_intrinsic_image_deref_atomic_umax:
363 case nir_intrinsic_image_deref_atomic_and:
364 case nir_intrinsic_image_deref_atomic_or:
365 case nir_intrinsic_image_deref_atomic_xor:
366 case nir_intrinsic_image_deref_atomic_exchange:
367 case nir_intrinsic_image_deref_atomic_comp_swap:
368 case nir_intrinsic_image_deref_atomic_inc_wrap:
369 case nir_intrinsic_image_deref_atomic_dec_wrap:
370 info->writes_memory = true;
371 info->num_memory_instructions++; /* we only care about stores */
372 break;
373 case nir_intrinsic_store_ssbo:
374 case nir_intrinsic_ssbo_atomic_add:
375 case nir_intrinsic_ssbo_atomic_imin:
376 case nir_intrinsic_ssbo_atomic_umin:
377 case nir_intrinsic_ssbo_atomic_imax:
378 case nir_intrinsic_ssbo_atomic_umax:
379 case nir_intrinsic_ssbo_atomic_and:
380 case nir_intrinsic_ssbo_atomic_or:
381 case nir_intrinsic_ssbo_atomic_xor:
382 case nir_intrinsic_ssbo_atomic_exchange:
383 case nir_intrinsic_ssbo_atomic_comp_swap:
384 info->writes_memory = true;
385 info->num_memory_instructions++; /* we only care about stores */
386 break;
387 case nir_intrinsic_load_color0:
388 case nir_intrinsic_load_color1: {
389 unsigned index = intr->intrinsic == nir_intrinsic_load_color1;
390 uint8_t mask = nir_ssa_def_components_read(&intr->dest.ssa);
391 info->colors_read |= mask << (index * 4);
392 break;
393 }
394 case nir_intrinsic_load_barycentric_pixel:
395 case nir_intrinsic_load_barycentric_centroid:
396 case nir_intrinsic_load_barycentric_sample:
397 case nir_intrinsic_load_barycentric_at_offset: /* uses center */
398 case nir_intrinsic_load_barycentric_at_sample: { /* uses center */
399 unsigned mode = nir_intrinsic_interp_mode(intr);
400
401 if (mode == INTERP_MODE_FLAT)
402 break;
403
404 if (mode == INTERP_MODE_NOPERSPECTIVE) {
405 if (intr->intrinsic == nir_intrinsic_load_barycentric_sample)
406 info->uses_linear_sample = true;
407 else if (intr->intrinsic == nir_intrinsic_load_barycentric_centroid)
408 info->uses_linear_centroid = true;
409 else
410 info->uses_linear_center = true;
411
412 if (intr->intrinsic == nir_intrinsic_load_barycentric_at_sample)
413 info->uses_linear_opcode_interp_sample = true;
414 } else {
415 if (intr->intrinsic == nir_intrinsic_load_barycentric_sample)
416 info->uses_persp_sample = true;
417 else if (intr->intrinsic == nir_intrinsic_load_barycentric_centroid)
418 info->uses_persp_centroid = true;
419 else
420 info->uses_persp_center = true;
421
422 if (intr->intrinsic == nir_intrinsic_load_barycentric_at_sample)
423 info->uses_persp_opcode_interp_sample = true;
424 }
425 break;
426 }
427 case nir_intrinsic_load_input:
428 case nir_intrinsic_load_per_vertex_input:
429 case nir_intrinsic_load_input_vertex:
430 case nir_intrinsic_load_interpolated_input:
431 scan_io_usage(info, intr, true);
432 break;
433 case nir_intrinsic_load_output:
434 case nir_intrinsic_load_per_vertex_output:
435 case nir_intrinsic_store_output:
436 case nir_intrinsic_store_per_vertex_output:
437 scan_io_usage(info, intr, false);
438 break;
439 case nir_intrinsic_load_deref:
440 case nir_intrinsic_store_deref:
441 case nir_intrinsic_interp_deref_at_centroid:
442 case nir_intrinsic_interp_deref_at_sample:
443 case nir_intrinsic_interp_deref_at_offset:
444 unreachable("these opcodes should have been lowered");
445 break;
446 default:
447 break;
448 }
449 }
450 }
451
452 void si_nir_scan_shader(const struct nir_shader *nir, struct si_shader_info *info)
453 {
454 nir_function *func;
455
456 info->base = nir->info;
457 info->stage = nir->info.stage;
458
459 if (nir->info.stage == MESA_SHADER_TESS_EVAL) {
460 STATIC_ASSERT((TESS_SPACING_EQUAL + 1) % 3 == PIPE_TESS_SPACING_EQUAL);
461 STATIC_ASSERT((TESS_SPACING_FRACTIONAL_ODD + 1) % 3 == PIPE_TESS_SPACING_FRACTIONAL_ODD);
462 STATIC_ASSERT((TESS_SPACING_FRACTIONAL_EVEN + 1) % 3 == PIPE_TESS_SPACING_FRACTIONAL_EVEN);
463
464 info->properties[TGSI_PROPERTY_TES_SPACING] = (nir->info.tess.spacing + 1) % 3;
465 info->properties[TGSI_PROPERTY_TES_VERTEX_ORDER_CW] = !nir->info.tess.ccw;
466
467 if (info->base.tess.primitive_mode == GL_ISOLINES)
468 info->base.tess.primitive_mode = GL_LINES;
469 }
470
471 if (nir->info.stage == MESA_SHADER_GEOMETRY) {
472 info->properties[TGSI_PROPERTY_GS_INPUT_PRIM] = nir->info.gs.input_primitive;
473 info->properties[TGSI_PROPERTY_GS_OUTPUT_PRIM] = nir->info.gs.output_primitive;
474 info->properties[TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES] = nir->info.gs.vertices_out;
475 info->properties[TGSI_PROPERTY_GS_INVOCATIONS] = nir->info.gs.invocations;
476 }
477
478 if (nir->info.stage == MESA_SHADER_FRAGMENT) {
479 info->properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL] =
480 nir->info.fs.early_fragment_tests | nir->info.fs.post_depth_coverage;
481 info->properties[TGSI_PROPERTY_FS_POST_DEPTH_COVERAGE] = nir->info.fs.post_depth_coverage;
482
483 if (nir->info.fs.pixel_center_integer) {
484 info->properties[TGSI_PROPERTY_FS_COORD_PIXEL_CENTER] = TGSI_FS_COORD_PIXEL_CENTER_INTEGER;
485 }
486
487 if (nir->info.fs.depth_layout != FRAG_DEPTH_LAYOUT_NONE) {
488 switch (nir->info.fs.depth_layout) {
489 case FRAG_DEPTH_LAYOUT_ANY:
490 info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_ANY;
491 break;
492 case FRAG_DEPTH_LAYOUT_GREATER:
493 info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_GREATER;
494 break;
495 case FRAG_DEPTH_LAYOUT_LESS:
496 info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_LESS;
497 break;
498 case FRAG_DEPTH_LAYOUT_UNCHANGED:
499 info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_UNCHANGED;
500 break;
501 default:
502 unreachable("Unknow depth layout");
503 }
504 }
505
506 info->color_interpolate[0] = nir->info.fs.color0_interp;
507 info->color_interpolate[1] = nir->info.fs.color1_interp;
508 for (unsigned i = 0; i < 2; i++) {
509 if (info->color_interpolate[i] == INTERP_MODE_NONE)
510 info->color_interpolate[i] = INTERP_MODE_COLOR;
511 }
512
513 info->color_interpolate_loc[0] = nir->info.fs.color0_sample ? TGSI_INTERPOLATE_LOC_SAMPLE :
514 nir->info.fs.color0_centroid ? TGSI_INTERPOLATE_LOC_CENTROID :
515 TGSI_INTERPOLATE_LOC_CENTER;
516 info->color_interpolate_loc[1] = nir->info.fs.color1_sample ? TGSI_INTERPOLATE_LOC_SAMPLE :
517 nir->info.fs.color1_centroid ? TGSI_INTERPOLATE_LOC_CENTROID :
518 TGSI_INTERPOLATE_LOC_CENTER;
519 }
520
521 if (gl_shader_stage_is_compute(nir->info.stage)) {
522 info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] = nir->info.cs.local_size[0];
523 info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT] = nir->info.cs.local_size[1];
524 info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH] = nir->info.cs.local_size[2];
525 info->properties[TGSI_PROPERTY_CS_USER_DATA_COMPONENTS_AMD] =
526 nir->info.cs.user_data_components_amd;
527 }
528
529 info->constbuf0_num_slots = nir->num_uniforms;
530 info->shader_buffers_declared = u_bit_consecutive(0, nir->info.num_ssbos);
531 info->const_buffers_declared = u_bit_consecutive(0, nir->info.num_ubos);
532 info->images_declared = u_bit_consecutive(0, nir->info.num_images);
533 info->msaa_images_declared = nir->info.msaa_images;
534 info->image_buffers = nir->info.image_buffers;
535 info->samplers_declared = nir->info.textures_used;
536
537 info->num_written_clipdistance = nir->info.clip_distance_array_size;
538 info->num_written_culldistance = nir->info.cull_distance_array_size;
539 info->clipdist_writemask = u_bit_consecutive(0, info->num_written_clipdistance);
540 info->culldist_writemask = u_bit_consecutive(0, info->num_written_culldistance);
541
542 if (info->stage == MESA_SHADER_FRAGMENT)
543 info->uses_kill = nir->info.fs.uses_discard;
544
545 if (nir->info.stage == MESA_SHADER_TESS_CTRL) {
546 info->tessfactors_are_def_in_all_invocs = ac_are_tessfactors_def_in_all_invocs(nir);
547 }
548
549 memset(info->output_semantic_to_slot, -1, sizeof(info->output_semantic_to_slot));
550
551 func = (struct nir_function *)exec_list_get_head_const(&nir->functions);
552 nir_foreach_block (block, func->impl) {
553 nir_foreach_instr (instr, block)
554 scan_instruction(nir, info, instr);
555 }
556
557 /* Add color inputs to the list of inputs. */
558 if (nir->info.stage == MESA_SHADER_FRAGMENT) {
559 for (unsigned i = 0; i < 2; i++) {
560 if ((info->colors_read >> (i * 4)) & 0xf) {
561 info->input_semantic[info->num_inputs] = VARYING_SLOT_COL0 + i;
562 info->input_interpolate[info->num_inputs] = info->color_interpolate[i];
563 info->input_usage_mask[info->num_inputs] = info->colors_read >> (i * 4);
564 info->num_inputs++;
565 }
566 }
567 }
568
569 /* Trim output read masks based on write masks. */
570 for (unsigned i = 0; i < info->num_outputs; i++)
571 info->output_readmask[i] &= info->output_usagemask[i];
572 }
573
574 static void si_nir_opts(struct nir_shader *nir, bool first)
575 {
576 bool progress;
577
578 NIR_PASS_V(nir, nir_lower_vars_to_ssa);
579 NIR_PASS_V(nir, nir_lower_alu_to_scalar, NULL, NULL);
580 NIR_PASS_V(nir, nir_lower_phis_to_scalar);
581
582 do {
583 progress = false;
584 bool lower_alu_to_scalar = false;
585 bool lower_phis_to_scalar = false;
586
587 if (first) {
588 bool opt_find_array_copies = false;
589
590 NIR_PASS(progress, nir, nir_split_array_vars, nir_var_function_temp);
591 NIR_PASS(lower_alu_to_scalar, nir, nir_shrink_vec_array_vars, nir_var_function_temp);
592 NIR_PASS(opt_find_array_copies, nir, nir_opt_find_array_copies);
593 NIR_PASS(progress, nir, nir_opt_copy_prop_vars);
594
595 /* Call nir_lower_var_copies() to remove any copies introduced
596 * by nir_opt_find_array_copies().
597 */
598 if (opt_find_array_copies)
599 NIR_PASS(progress, nir, nir_lower_var_copies);
600 progress |= opt_find_array_copies;
601 } else {
602 NIR_PASS(progress, nir, nir_opt_copy_prop_vars);
603 }
604
605 NIR_PASS(progress, nir, nir_opt_dead_write_vars);
606
607 NIR_PASS(lower_alu_to_scalar, nir, nir_opt_trivial_continues);
608 /* (Constant) copy propagation is needed for txf with offsets. */
609 NIR_PASS(progress, nir, nir_copy_prop);
610 NIR_PASS(progress, nir, nir_opt_remove_phis);
611 NIR_PASS(progress, nir, nir_opt_dce);
612 NIR_PASS(lower_phis_to_scalar, nir, nir_opt_if, true);
613 NIR_PASS(progress, nir, nir_opt_dead_cf);
614
615 if (lower_alu_to_scalar)
616 NIR_PASS_V(nir, nir_lower_alu_to_scalar, NULL, NULL);
617 if (lower_phis_to_scalar)
618 NIR_PASS_V(nir, nir_lower_phis_to_scalar);
619 progress |= lower_alu_to_scalar | lower_phis_to_scalar;
620
621 NIR_PASS(progress, nir, nir_opt_cse);
622 NIR_PASS(progress, nir, nir_opt_peephole_select, 8, true, true);
623
624 /* Needed for algebraic lowering */
625 NIR_PASS(progress, nir, nir_opt_algebraic);
626 NIR_PASS(progress, nir, nir_opt_constant_folding);
627
628 if (!nir->info.flrp_lowered) {
629 unsigned lower_flrp = (nir->options->lower_flrp16 ? 16 : 0) |
630 (nir->options->lower_flrp32 ? 32 : 0) |
631 (nir->options->lower_flrp64 ? 64 : 0);
632 assert(lower_flrp);
633 bool lower_flrp_progress = false;
634
635 NIR_PASS(lower_flrp_progress, nir, nir_lower_flrp, lower_flrp, false /* always_precise */);
636 if (lower_flrp_progress) {
637 NIR_PASS(progress, nir, nir_opt_constant_folding);
638 progress = true;
639 }
640
641 /* Nothing should rematerialize any flrps, so we only
642 * need to do this lowering once.
643 */
644 nir->info.flrp_lowered = true;
645 }
646
647 NIR_PASS(progress, nir, nir_opt_undef);
648 NIR_PASS(progress, nir, nir_opt_conditional_discard);
649 if (nir->options->max_unroll_iterations) {
650 NIR_PASS(progress, nir, nir_opt_loop_unroll, 0);
651 }
652 } while (progress);
653 }
654
655 static int type_size_vec4(const struct glsl_type *type, bool bindless)
656 {
657 return glsl_count_attribute_slots(type, false);
658 }
659
660 static void si_nir_lower_color(nir_shader *nir)
661 {
662 nir_function_impl *entrypoint = nir_shader_get_entrypoint(nir);
663
664 nir_builder b;
665 nir_builder_init(&b, entrypoint);
666
667 nir_foreach_block (block, entrypoint) {
668 nir_foreach_instr_safe (instr, block) {
669 if (instr->type != nir_instr_type_intrinsic)
670 continue;
671
672 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
673
674 if (intrin->intrinsic != nir_intrinsic_load_deref)
675 continue;
676
677 nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
678 if (deref->mode != nir_var_shader_in)
679 continue;
680
681 b.cursor = nir_before_instr(instr);
682 nir_variable *var = nir_deref_instr_get_variable(deref);
683 nir_ssa_def *def;
684
685 if (var->data.location == VARYING_SLOT_COL0) {
686 def = nir_load_color0(&b);
687 nir->info.fs.color0_interp = var->data.interpolation;
688 nir->info.fs.color0_sample = var->data.sample;
689 nir->info.fs.color0_centroid = var->data.centroid;
690 } else if (var->data.location == VARYING_SLOT_COL1) {
691 def = nir_load_color1(&b);
692 nir->info.fs.color1_interp = var->data.interpolation;
693 nir->info.fs.color1_sample = var->data.sample;
694 nir->info.fs.color1_centroid = var->data.centroid;
695 } else {
696 continue;
697 }
698
699 nir_ssa_def_rewrite_uses(&intrin->dest.ssa, nir_src_for_ssa(def));
700 nir_instr_remove(instr);
701 }
702 }
703 }
704
705 static void si_lower_io(struct nir_shader *nir)
706 {
707 /* HW supports indirect indexing for: | Enabled in driver
708 * -------------------------------------------------------
709 * VS inputs | No
710 * TCS inputs | Yes
711 * TES inputs | Yes
712 * GS inputs | No
713 * -------------------------------------------------------
714 * VS outputs before TCS | No
715 * VS outputs before GS | No
716 * TCS outputs | Yes
717 * TES outputs before GS | No
718 */
719 bool has_indirect_inputs = nir->info.stage == MESA_SHADER_TESS_CTRL ||
720 nir->info.stage == MESA_SHADER_TESS_EVAL;
721 bool has_indirect_outputs = nir->info.stage == MESA_SHADER_TESS_CTRL;
722
723 if (!has_indirect_inputs || !has_indirect_outputs) {
724 NIR_PASS_V(nir, nir_lower_io_to_temporaries, nir_shader_get_entrypoint(nir),
725 !has_indirect_outputs, !has_indirect_inputs);
726
727 /* Since we're doing nir_lower_io_to_temporaries late, we need
728 * to lower all the copy_deref's introduced by
729 * lower_io_to_temporaries before calling nir_lower_io.
730 */
731 NIR_PASS_V(nir, nir_split_var_copies);
732 NIR_PASS_V(nir, nir_lower_var_copies);
733 NIR_PASS_V(nir, nir_lower_global_vars_to_local);
734 }
735
736 if (nir->info.stage == MESA_SHADER_FRAGMENT)
737 si_nir_lower_color(nir);
738
739 NIR_PASS_V(nir, nir_lower_io, nir_var_shader_out | nir_var_shader_in,
740 type_size_vec4, 0);
741 nir->info.io_lowered = true;
742
743 /* This pass needs actual constants */
744 NIR_PASS_V(nir, nir_opt_constant_folding);
745 NIR_PASS_V(nir, nir_io_add_const_offset_to_base, nir_var_shader_in);
746 NIR_PASS_V(nir, nir_io_add_const_offset_to_base, nir_var_shader_out);
747
748 /* Remove dead derefs, so that nir_validate doesn't fail. */
749 NIR_PASS_V(nir, nir_opt_dce);
750
751 /* Remove input and output nir_variables, because we don't need them
752 * anymore. Also remove uniforms, because those should have been lowered
753 * to UBOs already.
754 */
755 unsigned modes = nir_var_shader_in | nir_var_shader_out | nir_var_uniform;
756 nir_foreach_variable_with_modes_safe(var, nir, modes) {
757 if (var->data.mode == nir_var_uniform &&
758 (glsl_type_get_image_count(var->type) ||
759 glsl_type_get_sampler_count(var->type)))
760 continue;
761
762 exec_node_remove(&var->node);
763 }
764 }
765
766 /**
767 * Perform "lowering" operations on the NIR that are run once when the shader
768 * selector is created.
769 */
770 static void si_lower_nir(struct si_screen *sscreen, struct nir_shader *nir)
771 {
772 /* Perform lowerings (and optimizations) of code.
773 *
774 * Performance considerations aside, we must:
775 * - lower certain ALU operations
776 * - ensure constant offsets for texture instructions are folded
777 * and copy-propagated
778 */
779
780 static const struct nir_lower_tex_options lower_tex_options = {
781 .lower_txp = ~0u,
782 };
783 NIR_PASS_V(nir, nir_lower_tex, &lower_tex_options);
784
785 const nir_lower_subgroups_options subgroups_options = {
786 .subgroup_size = 64,
787 .ballot_bit_size = 64,
788 .lower_to_scalar = true,
789 .lower_subgroup_masks = true,
790 .lower_vote_trivial = false,
791 .lower_vote_eq_to_ballot = true,
792 };
793 NIR_PASS_V(nir, nir_lower_subgroups, &subgroups_options);
794
795 /* Lower load constants to scalar and then clean up the mess */
796 NIR_PASS_V(nir, nir_lower_load_const_to_scalar);
797 NIR_PASS_V(nir, nir_lower_var_copies);
798 NIR_PASS_V(nir, nir_lower_pack);
799 NIR_PASS_V(nir, nir_opt_access);
800 si_nir_opts(nir, true);
801
802 /* Lower large variables that are always constant with load_constant
803 * intrinsics, which get turned into PC-relative loads from a data
804 * section next to the shader.
805 *
806 * st/mesa calls finalize_nir twice, but we can't call this pass twice.
807 */
808 bool changed = false;
809 if (!nir->constant_data) {
810 /* The pass crashes if there are dead temps of lowered IO interface types. */
811 NIR_PASS_V(nir, nir_remove_dead_variables, nir_var_function_temp, NULL);
812 NIR_PASS(changed, nir, nir_opt_large_constants, glsl_get_natural_size_align_bytes, 16);
813 }
814
815 changed |= ac_lower_indirect_derefs(nir, sscreen->info.chip_class);
816 if (changed)
817 si_nir_opts(nir, false);
818
819 NIR_PASS_V(nir, nir_lower_bool_to_int32);
820 NIR_PASS_V(nir, nir_remove_dead_variables, nir_var_function_temp, NULL);
821
822 if (sscreen->debug_flags & DBG(FS_CORRECT_DERIVS_AFTER_KILL))
823 NIR_PASS_V(nir, nir_lower_discard_to_demote);
824 }
825
826 void si_finalize_nir(struct pipe_screen *screen, void *nirptr, bool optimize)
827 {
828 struct si_screen *sscreen = (struct si_screen *)screen;
829 struct nir_shader *nir = (struct nir_shader *)nirptr;
830
831 nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
832 si_lower_io(nir);
833 si_lower_nir(sscreen, nir);
834 }