f97b7f9b67f05946b2afa0509e621e255c005084
[mesa.git] / src / compiler / nir / nir_opt_shrink_load.c
1 /*
2 * Copyright © 2018 Valve 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
27 opt_shrink_load(nir_intrinsic_instr *instr)
28 {
29 bool progress = false;
30
31 if (instr->intrinsic == nir_intrinsic_load_push_constant) {
32 unsigned mask = nir_ssa_def_components_read(&instr->dest.ssa);
33
34 if (instr->num_components > util_last_bit(mask)) {
35 instr->num_components = util_last_bit(mask);
36 instr->dest.ssa.num_components = instr->num_components;
37 progress = true;
38 }
39 }
40
41 return progress;
42 }
43
44 bool
45 nir_opt_shrink_load(nir_shader *shader)
46 {
47 bool progress = false;
48
49 nir_foreach_function(function, shader) {
50 if (!function->impl)
51 continue;
52
53 nir_foreach_block(block, function->impl) {
54 nir_foreach_instr(instr, block) {
55 if (instr->type != nir_instr_type_intrinsic)
56 continue;
57
58 progress |= opt_shrink_load(nir_instr_as_intrinsic(instr));
59 }
60 }
61
62 nir_metadata_preserve(function->impl, nir_metadata_block_index |
63 nir_metadata_dominance);
64 }
65
66 return progress;
67 }