1 /*
2 * Copyright © 2016 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 static bool
deref_apply_constant_initializer(nir_deref_var * deref,void * state)28 deref_apply_constant_initializer(nir_deref_var *deref, void *state)
29 {
30 struct nir_builder *b = state;
31
32 nir_load_const_instr *initializer =
33 nir_deref_get_const_initializer_load(b->shader, deref);
34 nir_builder_instr_insert(b, &initializer->instr);
35
36 nir_store_deref_var(b, deref, &initializer->def, 0xf);
37
38 return true;
39 }
40
41 static bool
lower_const_initializer(struct nir_builder * b,struct exec_list * var_list)42 lower_const_initializer(struct nir_builder *b, struct exec_list *var_list)
43 {
44 bool progress = false;
45
46 b->cursor = nir_before_cf_list(&b->impl->body);
47
48 nir_foreach_variable(var, var_list) {
49 if (!var->constant_initializer)
50 continue;
51
52 progress = true;
53
54 nir_deref_var deref;
55 deref.deref.deref_type = nir_deref_type_var,
56 deref.deref.child = NULL;
57 deref.deref.type = var->type,
58 deref.var = var;
59
60 nir_deref_foreach_leaf(&deref, deref_apply_constant_initializer, b);
61
62 var->constant_initializer = NULL;
63 }
64
65 return progress;
66 }
67
68 bool
nir_lower_constant_initializers(nir_shader * shader,nir_variable_mode modes)69 nir_lower_constant_initializers(nir_shader *shader, nir_variable_mode modes)
70 {
71 bool progress = false;
72
73 nir_builder builder;
74 if (modes & ~nir_var_local)
75 nir_builder_init(&builder, nir_shader_get_entrypoint(shader));
76
77 if (modes & nir_var_shader_out)
78 progress |= lower_const_initializer(&builder, &shader->outputs);
79
80 if (modes & nir_var_global)
81 progress |= lower_const_initializer(&builder, &shader->globals);
82
83 if (modes & nir_var_system_value)
84 progress |= lower_const_initializer(&builder, &shader->system_values);
85
86 if (progress) {
87 nir_foreach_function(function, shader) {
88 if (function->impl) {
89 nir_metadata_preserve(function->impl, nir_metadata_block_index |
90 nir_metadata_dominance |
91 nir_metadata_live_ssa_defs);
92 }
93 }
94 }
95
96 if (modes & nir_var_local) {
97 nir_foreach_function(function, shader) {
98 if (!function->impl)
99 continue;
100
101 nir_builder_init(&builder, function->impl);
102 if (lower_const_initializer(&builder, &function->impl->locals)) {
103 nir_metadata_preserve(function->impl, nir_metadata_block_index |
104 nir_metadata_dominance |
105 nir_metadata_live_ssa_defs);
106 progress = true;
107 }
108 }
109 }
110
111 return progress;
112 }
113