1 /*
2 * Copyright © 2017 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 #include "nir_builder.h"
26
27 /**
28 * \file nir_opt_intrinsics.c
29 */
30
31 static bool
opt_intrinsics_impl(nir_function_impl * impl)32 opt_intrinsics_impl(nir_function_impl *impl)
33 {
34 nir_builder b;
35 nir_builder_init(&b, impl);
36 bool progress = false;
37
38 nir_foreach_block(block, impl) {
39 nir_foreach_instr_safe(instr, block) {
40 if (instr->type != nir_instr_type_intrinsic)
41 continue;
42
43 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
44 nir_ssa_def *replacement = NULL;
45 b.cursor = nir_before_instr(instr);
46
47 switch (intrin->intrinsic) {
48 case nir_intrinsic_vote_any:
49 case nir_intrinsic_vote_all:
50 if (nir_src_as_const_value(intrin->src[0]))
51 replacement = nir_ssa_for_src(&b, intrin->src[0], 1);
52 break;
53 case nir_intrinsic_vote_eq:
54 if (nir_src_as_const_value(intrin->src[0]))
55 replacement = nir_imm_int(&b, NIR_TRUE);
56 break;
57 default:
58 break;
59 }
60
61 if (!replacement)
62 continue;
63
64 nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
65 nir_src_for_ssa(replacement));
66 nir_instr_remove(instr);
67 progress = true;
68 }
69 }
70
71 return progress;
72 }
73
74 bool
nir_opt_intrinsics(nir_shader * shader)75 nir_opt_intrinsics(nir_shader *shader)
76 {
77 bool progress = false;
78
79 nir_foreach_function(function, shader) {
80 if (!function->impl)
81 continue;
82
83 if (opt_intrinsics_impl(function->impl)) {
84 progress = true;
85 nir_metadata_preserve(function->impl, nir_metadata_block_index |
86 nir_metadata_dominance);
87 }
88 }
89
90 return progress;
91 }
92