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Viewing changes to src/compiler/nir/nir_lower_atomics_to_ssbo.c

  • Committer: mmach
  • Date: 2022-09-22 19:56:13 UTC
  • Revision ID: netbit73@gmail.com-20220922195613-wtik9mmy20tmor0i
2022-09-22 21:17:09

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src/compiler/nir/nir_lower_atomics_to_ssbo.c
1
 
/*
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 * Copyright © 2017 Red Hat
3
 
 *
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:
10
 
 *
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
13
 
 * Software.
14
 
 *
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
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 * 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
21
 
 * IN THE SOFTWARE.
22
 
 *
23
 
 * Authors:
24
 
 *    Rob Clark <robclark@freedesktop.org>
25
 
 */
26
 
 
27
 
#include "nir.h"
28
 
#include "nir_builder.h"
29
 
 
30
 
/*
31
 
 * Remap atomic counters to SSBOs, starting from the shader's next SSBO slot
32
 
 * (info.num_ssbos).
33
 
 */
34
 
 
35
 
static bool
36
 
lower_instr(nir_intrinsic_instr *instr, unsigned ssbo_offset, nir_builder *b)
37
 
{
38
 
   nir_intrinsic_op op;
39
 
 
40
 
   b->cursor = nir_before_instr(&instr->instr);
41
 
 
42
 
   switch (instr->intrinsic) {
43
 
   case nir_intrinsic_memory_barrier_atomic_counter:
44
 
      /* Atomic counters are now SSBOs so memoryBarrierAtomicCounter() is now
45
 
       * memoryBarrierBuffer().
46
 
       */
47
 
      instr->intrinsic = nir_intrinsic_memory_barrier_buffer;
48
 
      return true;
49
 
 
50
 
   case nir_intrinsic_atomic_counter_inc:
51
 
   case nir_intrinsic_atomic_counter_add:
52
 
   case nir_intrinsic_atomic_counter_pre_dec:
53
 
   case nir_intrinsic_atomic_counter_post_dec:
54
 
      /* inc and dec get remapped to add: */
55
 
      op = nir_intrinsic_ssbo_atomic_add;
56
 
      break;
57
 
   case nir_intrinsic_atomic_counter_read:
58
 
      op = nir_intrinsic_load_ssbo;
59
 
      break;
60
 
   case nir_intrinsic_atomic_counter_min:
61
 
      op = nir_intrinsic_ssbo_atomic_umin;
62
 
      break;
63
 
   case nir_intrinsic_atomic_counter_max:
64
 
      op = nir_intrinsic_ssbo_atomic_umax;
65
 
      break;
66
 
   case nir_intrinsic_atomic_counter_and:
67
 
      op = nir_intrinsic_ssbo_atomic_and;
68
 
      break;
69
 
   case nir_intrinsic_atomic_counter_or:
70
 
      op = nir_intrinsic_ssbo_atomic_or;
71
 
      break;
72
 
   case nir_intrinsic_atomic_counter_xor:
73
 
      op = nir_intrinsic_ssbo_atomic_xor;
74
 
      break;
75
 
   case nir_intrinsic_atomic_counter_exchange:
76
 
      op = nir_intrinsic_ssbo_atomic_exchange;
77
 
      break;
78
 
   case nir_intrinsic_atomic_counter_comp_swap:
79
 
      op = nir_intrinsic_ssbo_atomic_comp_swap;
80
 
      break;
81
 
   default:
82
 
      return false;
83
 
   }
84
 
 
85
 
   nir_ssa_def *buffer = nir_imm_int(b, ssbo_offset + nir_intrinsic_base(instr));
86
 
   nir_ssa_def *temp = NULL;
87
 
   nir_intrinsic_instr *new_instr =
88
 
         nir_intrinsic_instr_create(b->shader, op);
89
 
 
90
 
   /* a couple instructions need special handling since they don't map
91
 
    * 1:1 with ssbo atomics
92
 
    */
93
 
   switch (instr->intrinsic) {
94
 
   case nir_intrinsic_atomic_counter_inc:
95
 
      /* remapped to ssbo_atomic_add: { buffer_idx, offset, +1 } */
96
 
      temp = nir_imm_int(b, +1);
97
 
      new_instr->src[0] = nir_src_for_ssa(buffer);
98
 
      nir_src_copy(&new_instr->src[1], &instr->src[0]);
99
 
      new_instr->src[2] = nir_src_for_ssa(temp);
100
 
      break;
101
 
   case nir_intrinsic_atomic_counter_pre_dec:
102
 
   case nir_intrinsic_atomic_counter_post_dec:
103
 
      /* remapped to ssbo_atomic_add: { buffer_idx, offset, -1 } */
104
 
      /* NOTE semantic difference so we adjust the return value below */
105
 
      temp = nir_imm_int(b, -1);
106
 
      new_instr->src[0] = nir_src_for_ssa(buffer);
107
 
      nir_src_copy(&new_instr->src[1], &instr->src[0]);
108
 
      new_instr->src[2] = nir_src_for_ssa(temp);
109
 
      break;
110
 
   case nir_intrinsic_atomic_counter_read:
111
 
      /* remapped to load_ssbo: { buffer_idx, offset } */
112
 
      new_instr->src[0] = nir_src_for_ssa(buffer);
113
 
      nir_src_copy(&new_instr->src[1], &instr->src[0]);
114
 
      break;
115
 
   default:
116
 
      /* remapped to ssbo_atomic_x: { buffer_idx, offset, data, (compare)? } */
117
 
      new_instr->src[0] = nir_src_for_ssa(buffer);
118
 
      nir_src_copy(&new_instr->src[1], &instr->src[0]);
119
 
      nir_src_copy(&new_instr->src[2], &instr->src[1]);
120
 
      if (op == nir_intrinsic_ssbo_atomic_comp_swap ||
121
 
          op == nir_intrinsic_ssbo_atomic_fcomp_swap)
122
 
         nir_src_copy(&new_instr->src[3], &instr->src[2]);
123
 
      break;
124
 
   }
125
 
 
126
 
   if (new_instr->intrinsic == nir_intrinsic_load_ssbo) {
127
 
      nir_intrinsic_set_align(new_instr, 4, 0);
128
 
 
129
 
      /* we could be replacing an intrinsic with fixed # of dest
130
 
       * num_components with one that has variable number.  So
131
 
       * best to take this from the dest:
132
 
       */
133
 
      new_instr->num_components = instr->dest.ssa.num_components;
134
 
   }
135
 
 
136
 
   nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
137
 
                     instr->dest.ssa.num_components,
138
 
                     instr->dest.ssa.bit_size, NULL);
139
 
   nir_instr_insert_before(&instr->instr, &new_instr->instr);
140
 
   nir_instr_remove(&instr->instr);
141
 
 
142
 
   if (instr->intrinsic == nir_intrinsic_atomic_counter_pre_dec) {
143
 
      b->cursor = nir_after_instr(&new_instr->instr);
144
 
      nir_ssa_def *result = nir_iadd(b, &new_instr->dest.ssa, temp);
145
 
      nir_ssa_def_rewrite_uses(&instr->dest.ssa, result);
146
 
   } else {
147
 
      nir_ssa_def_rewrite_uses(&instr->dest.ssa, &new_instr->dest.ssa);
148
 
   }
149
 
 
150
 
   return true;
151
 
}
152
 
 
153
 
static bool
154
 
is_atomic_uint(const struct glsl_type *type)
155
 
{
156
 
   if (glsl_get_base_type(type) == GLSL_TYPE_ARRAY)
157
 
      return is_atomic_uint(glsl_get_array_element(type));
158
 
   return glsl_get_base_type(type) == GLSL_TYPE_ATOMIC_UINT;
159
 
}
160
 
 
161
 
bool
162
 
nir_lower_atomics_to_ssbo(nir_shader *shader)
163
 
{
164
 
   unsigned ssbo_offset = shader->info.num_ssbos;
165
 
   bool progress = false;
166
 
 
167
 
   nir_foreach_function(function, shader) {
168
 
      if (function->impl) {
169
 
         nir_builder builder;
170
 
         nir_builder_init(&builder, function->impl);
171
 
         nir_foreach_block(block, function->impl) {
172
 
            nir_foreach_instr_safe(instr, block) {
173
 
               if (instr->type == nir_instr_type_intrinsic)
174
 
                  progress |= lower_instr(nir_instr_as_intrinsic(instr),
175
 
                                          ssbo_offset, &builder);
176
 
            }
177
 
         }
178
 
 
179
 
         nir_metadata_preserve(function->impl, nir_metadata_block_index |
180
 
                                               nir_metadata_dominance);
181
 
      }
182
 
   }
183
 
 
184
 
   if (progress) {
185
 
      /* replace atomic_uint uniforms with ssbo's: */
186
 
      unsigned replaced = 0;
187
 
      nir_foreach_uniform_variable_safe(var, shader) {
188
 
         if (is_atomic_uint(var->type)) {
189
 
            exec_node_remove(&var->node);
190
 
 
191
 
            if (replaced & (1 << var->data.binding))
192
 
               continue;
193
 
 
194
 
            nir_variable *ssbo;
195
 
            char name[16];
196
 
 
197
 
            /* A length of 0 is used to denote unsized arrays */
198
 
            const struct glsl_type *type = glsl_array_type(glsl_uint_type(), 0, 0);
199
 
 
200
 
            snprintf(name, sizeof(name), "counter%d", var->data.binding);
201
 
 
202
 
            ssbo = nir_variable_create(shader, nir_var_mem_ssbo, type, name);
203
 
            ssbo->data.binding = ssbo_offset + var->data.binding;
204
 
            ssbo->data.explicit_binding = var->data.explicit_binding;
205
 
 
206
 
            /* We can't use num_abos, because it only represents the number of
207
 
             * active atomic counters, and currently unlike SSBO's they aren't
208
 
             * compacted so num_abos actually isn't a bound on the index passed
209
 
             * to nir_intrinsic_atomic_counter_*. e.g. if we have a single atomic
210
 
             * counter declared like:
211
 
             *
212
 
             * layout(binding=1) atomic_uint counter0;
213
 
             *
214
 
             * then when we lower accesses to it the atomic_counter_* intrinsics
215
 
             * will have 1 as the index but num_abos will still be 1.
216
 
             */
217
 
            shader->info.num_ssbos = MAX2(shader->info.num_ssbos,
218
 
                                          ssbo->data.binding + 1);
219
 
 
220
 
            struct glsl_struct_field field = {
221
 
                  .type = type,
222
 
                  .name = "counters",
223
 
                  .location = -1,
224
 
            };
225
 
 
226
 
            ssbo->interface_type =
227
 
                  glsl_interface_type(&field, 1, GLSL_INTERFACE_PACKING_STD430,
228
 
                                      false, "counters");
229
 
 
230
 
            replaced |= (1 << var->data.binding);
231
 
         }
232
 
      }
233
 
 
234
 
      shader->info.num_abos = 0;
235
 
   }
236
 
 
237
 
   return progress;
238
 
}
239