1 /*
2 * Copyright 2017 Advanced Micro Devices, Inc.
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 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 /*
25 * Remap load_uniform intrinsics to UBO accesses of UBO binding point 0. Both
26 * the base and the offset are interpreted as 16-byte units.
27 *
28 * Simultaneously, remap existing UBO accesses by increasing their binding
29 * point by 1.
30 */
31
32 #include "nir.h"
33 #include "nir_builder.h"
34
35 static bool
lower_instr(nir_intrinsic_instr * instr,nir_builder * b)36 lower_instr(nir_intrinsic_instr *instr, nir_builder *b)
37 {
38 b->cursor = nir_before_instr(&instr->instr);
39
40 if (instr->intrinsic == nir_intrinsic_load_ubo) {
41 nir_ssa_def *old_idx = nir_ssa_for_src(b, instr->src[0], 1);
42 nir_ssa_def *new_idx = nir_iadd(b, old_idx, nir_imm_int(b, 1));
43 nir_instr_rewrite_src(&instr->instr, &instr->src[0],
44 nir_src_for_ssa(new_idx));
45 return true;
46 }
47
48 if (instr->intrinsic == nir_intrinsic_load_uniform) {
49 nir_ssa_def *ubo_idx = nir_imm_int(b, 0);
50 nir_ssa_def *ubo_offset =
51 nir_imul(b, nir_imm_int(b, 16),
52 nir_iadd(b, nir_imm_int(b, nir_intrinsic_base(instr)),
53 nir_ssa_for_src(b, instr->src[0], 1)));
54
55 nir_intrinsic_instr *load =
56 nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_ubo);
57 load->num_components = instr->num_components;
58 load->src[0] = nir_src_for_ssa(ubo_idx);
59 load->src[1] = nir_src_for_ssa(ubo_offset);
60 nir_ssa_dest_init(&load->instr, &load->dest,
61 load->num_components, instr->dest.ssa.bit_size,
62 instr->dest.ssa.name);
63 nir_builder_instr_insert(b, &load->instr);
64 nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&load->dest.ssa));
65
66 nir_instr_remove(&instr->instr);
67 return true;
68 }
69
70 return false;
71 }
72
73 bool
nir_lower_uniforms_to_ubo(nir_shader * shader)74 nir_lower_uniforms_to_ubo(nir_shader *shader)
75 {
76 bool progress = false;
77
78 nir_foreach_function(function, shader) {
79 if (function->impl) {
80 nir_builder builder;
81 nir_builder_init(&builder, function->impl);
82 nir_foreach_block(block, function->impl) {
83 nir_foreach_instr_safe(instr, block) {
84 if (instr->type == nir_instr_type_intrinsic)
85 progress |= lower_instr(nir_instr_as_intrinsic(instr),
86 &builder);
87 }
88 }
89
90 nir_metadata_preserve(function->impl, nir_metadata_block_index |
91 nir_metadata_dominance);
92 }
93 }
94
95 return progress;
96 }
97
98