2 * Copyright © 2016 Intel Corporation
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:
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
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
25 #include "nir_builder.h"
28 build_constant_load(nir_builder
*b
, nir_deref_instr
*deref
, nir_constant
*c
)
30 if (glsl_type_is_vector_or_scalar(deref
->type
)) {
31 nir_load_const_instr
*load
=
32 nir_load_const_instr_create(b
->shader
,
33 glsl_get_vector_elements(deref
->type
),
34 glsl_get_bit_size(deref
->type
));
35 memcpy(load
->value
, c
->values
, sizeof(*load
->value
) * load
->def
.num_components
);
36 nir_builder_instr_insert(b
, &load
->instr
);
37 nir_store_deref(b
, deref
, &load
->def
, ~0);
38 } else if (glsl_type_is_struct_or_ifc(deref
->type
)) {
39 unsigned len
= glsl_get_length(deref
->type
);
40 for (unsigned i
= 0; i
< len
; i
++) {
41 build_constant_load(b
, nir_build_deref_struct(b
, deref
, i
),
45 assert(glsl_type_is_array(deref
->type
) ||
46 glsl_type_is_matrix(deref
->type
));
47 unsigned len
= glsl_get_length(deref
->type
);
48 for (unsigned i
= 0; i
< len
; i
++) {
49 build_constant_load(b
,
50 nir_build_deref_array_imm(b
, deref
, i
),
57 lower_const_initializer(struct nir_builder
*b
, struct exec_list
*var_list
,
58 nir_variable_mode modes
)
60 bool progress
= false;
62 b
->cursor
= nir_before_cf_list(&b
->impl
->body
);
64 nir_foreach_variable_in_list(var
, var_list
) {
65 if (!(var
->data
.mode
& modes
))
68 if (var
->constant_initializer
) {
69 build_constant_load(b
, nir_build_deref_var(b
, var
),
70 var
->constant_initializer
);
73 var
->constant_initializer
= NULL
;
74 } else if (var
->pointer_initializer
) {
75 nir_deref_instr
*src_deref
= nir_build_deref_var(b
, var
->pointer_initializer
);
76 nir_deref_instr
*dst_deref
= nir_build_deref_var(b
, var
);
78 /* Note that this stores a pointer to src into dst */
79 nir_store_deref(b
, dst_deref
, &src_deref
->dest
.ssa
, ~0);
82 var
->pointer_initializer
= NULL
;
91 nir_lower_variable_initializers(nir_shader
*shader
, nir_variable_mode modes
)
93 bool progress
= false;
95 /* Only some variables have initializers that we want to lower. Others
96 * such as uniforms have initializers which are useful later during linking
97 * so we want to skip over those. Restrict to only variable types where
98 * initializers make sense so that callers can use nir_var_all.
100 modes
&= nir_var_shader_out
|
101 nir_var_shader_temp
|
102 nir_var_function_temp
|
103 nir_var_system_value
;
105 nir_foreach_function(function
, shader
) {
109 bool impl_progress
= false;
112 nir_builder_init(&builder
, function
->impl
);
114 if ((modes
& ~nir_var_function_temp
) && function
->is_entrypoint
) {
115 impl_progress
|= lower_const_initializer(&builder
,
120 if (modes
& nir_var_function_temp
) {
121 impl_progress
|= lower_const_initializer(&builder
,
122 &function
->impl
->locals
,
123 nir_var_function_temp
);
128 nir_metadata_preserve(function
->impl
, nir_metadata_block_index
|
129 nir_metadata_dominance
|
130 nir_metadata_live_ssa_defs
);
132 nir_metadata_preserve(function
->impl
, nir_metadata_all
);