1 /*
2 * Copyright © 2020 Intel Corporation
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
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
21 * IN THE SOFTWARE.
22 */
23
24 #include "nir.h"
25
26 static bool
nir_opt_combine_memory_barriers_impl(nir_function_impl * impl,nir_combine_memory_barrier_cb combine_cb,void * data)27 nir_opt_combine_memory_barriers_impl(
28 nir_function_impl *impl, nir_combine_memory_barrier_cb combine_cb, void *data)
29 {
30 bool progress = false;
31
32 nir_foreach_block(block, impl) {
33 nir_intrinsic_instr *prev = NULL;
34
35 nir_foreach_instr_safe(instr, block) {
36 if (instr->type != nir_instr_type_intrinsic) {
37 prev = NULL;
38 continue;
39 }
40
41 nir_intrinsic_instr *current = nir_instr_as_intrinsic(instr);
42 if (current->intrinsic != nir_intrinsic_scoped_barrier ||
43 nir_intrinsic_execution_scope(current) != NIR_SCOPE_NONE) {
44 prev = NULL;
45 continue;
46 }
47
48 if (prev && combine_cb(prev, current, data)) {
49 nir_instr_remove(¤t->instr);
50 progress = true;
51 } else {
52 prev = current;
53 }
54 }
55 }
56
57 if (progress) {
58 nir_metadata_preserve(impl, nir_metadata_block_index |
59 nir_metadata_dominance |
60 nir_metadata_live_ssa_defs);
61 } else {
62 nir_metadata_preserve(impl, nir_metadata_all);
63 }
64
65 return progress;
66 }
67
68 /* Combine adjacent scoped memory barriers. */
69 bool
nir_opt_combine_memory_barriers(nir_shader * shader,nir_combine_memory_barrier_cb combine_cb,void * data)70 nir_opt_combine_memory_barriers(
71 nir_shader *shader, nir_combine_memory_barrier_cb combine_cb, void *data)
72 {
73 assert(combine_cb);
74
75 bool progress = false;
76
77 nir_foreach_function(function, shader) {
78 if (function->impl &&
79 nir_opt_combine_memory_barriers_impl(function->impl, combine_cb, data)) {
80 progress = true;
81 }
82 }
83
84 return progress;
85 }
86