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author | Emil Velikov <emil.velikov@collabora.com> | 2016-01-18 12:54:03 +0200 |
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committer | Emil Velikov <emil.l.velikov@gmail.com> | 2016-01-26 16:08:30 +0000 |
commit | a39a8fbbaa129f4e52f2a3ad2747182e9a74d910 (patch) | |
tree | 823e881d54c149cde315bb140e46a8b781cdccb7 /src/compiler/nir/nir_lower_load_const_to_scalar.c | |
parent | f694da80c75cb2a51d0af3b24d68aae9c53d61aa (diff) | |
download | external_mesa3d-a39a8fbbaa129f4e52f2a3ad2747182e9a74d910.zip external_mesa3d-a39a8fbbaa129f4e52f2a3ad2747182e9a74d910.tar.gz external_mesa3d-a39a8fbbaa129f4e52f2a3ad2747182e9a74d910.tar.bz2 |
nir: move to compiler/
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>
Diffstat (limited to 'src/compiler/nir/nir_lower_load_const_to_scalar.c')
-rw-r--r-- | src/compiler/nir/nir_lower_load_const_to_scalar.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_lower_load_const_to_scalar.c b/src/compiler/nir/nir_lower_load_const_to_scalar.c new file mode 100644 index 0000000..1eeed13 --- /dev/null +++ b/src/compiler/nir/nir_lower_load_const_to_scalar.c @@ -0,0 +1,89 @@ +/* + * Copyright © 2015 Broadcom + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include "util/macros.h" +#include "nir.h" +#include "nir_builder.h" + +/** @file nir_lower_load_const_to_scalar.c + * + * Replaces vector nir_load_const instructions with a series of loads and a + * vec[234] to reconstruct the original vector (on the assumption that + * nir_lower_alu_to_scalar() will then be used to split it up). + * + * This gives NIR a chance to CSE more operations on a scalar shader, when the + * same value was used in different vector contant loads. + */ + +static void +lower_load_const_instr_scalar(nir_load_const_instr *lower) +{ + if (lower->def.num_components == 1) + return; + + nir_builder b; + nir_builder_init(&b, nir_cf_node_get_function(&lower->instr.block->cf_node)); + b.cursor = nir_before_instr(&lower->instr); + + /* Emit the individual loads. */ + nir_ssa_def *loads[4]; + for (unsigned i = 0; i < lower->def.num_components; i++) { + nir_load_const_instr *load_comp = nir_load_const_instr_create(b.shader, 1); + load_comp->value.u[0] = lower->value.u[i]; + nir_builder_instr_insert(&b, &load_comp->instr); + loads[i] = &load_comp->def; + } + + /* Batch things back together into a vector. */ + nir_ssa_def *vec = nir_vec(&b, loads, lower->def.num_components); + + /* Replace the old load with a reference to our reconstructed vector. */ + nir_ssa_def_rewrite_uses(&lower->def, nir_src_for_ssa(vec)); + nir_instr_remove(&lower->instr); +} + +static bool +lower_load_const_to_scalar_block(nir_block *block, void *data) +{ + nir_foreach_instr_safe(block, instr) { + if (instr->type == nir_instr_type_load_const) + lower_load_const_instr_scalar(nir_instr_as_load_const(instr)); + } + + return true; +} + +static void +nir_lower_load_const_to_scalar_impl(nir_function_impl *impl) +{ + nir_foreach_block(impl, lower_load_const_to_scalar_block, NULL); +} + +void +nir_lower_load_const_to_scalar(nir_shader *shader) +{ + nir_foreach_function(shader, function) { + if (function->impl) + nir_lower_load_const_to_scalar_impl(function->impl); + } +} |