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https://gitlab.freedesktop.org/mesa/mesa.git
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a39a8fbbaa
Signed-off-by: Emil Velikov <emil.velikov@collabora.com> Acked-by: Matt Turner <mattst88@gmail.com> Acked-by: Jose Fonseca <jfonseca@vmware.com>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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*
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*/
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#include "nir.h"
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static bool
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global_to_local(nir_register *reg)
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{
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nir_function_impl *impl = NULL;
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assert(reg->is_global);
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nir_foreach_def(reg, def_dest) {
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nir_instr *instr = def_dest->reg.parent_instr;
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nir_function_impl *instr_impl =
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nir_cf_node_get_function(&instr->block->cf_node);
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if (impl != NULL) {
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if (impl != instr_impl)
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return false;
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} else {
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impl = instr_impl;
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}
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}
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nir_foreach_use(reg, use_src) {
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nir_instr *instr = use_src->parent_instr;
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nir_function_impl *instr_impl =
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nir_cf_node_get_function(&instr->block->cf_node);
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if (impl != NULL) {
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if (impl != instr_impl)
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return false;
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} else {
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impl = instr_impl;
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}
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}
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nir_foreach_if_use(reg, use_src) {
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nir_if *if_stmt = use_src->parent_if;
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nir_function_impl *if_impl = nir_cf_node_get_function(&if_stmt->cf_node);
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if (impl != NULL) {
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if (impl != if_impl)
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return false;
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} else {
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impl = if_impl;
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}
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}
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if (impl == NULL) {
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/* this instruction is never used/defined, delete it */
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nir_reg_remove(reg);
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return true;
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}
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/*
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* if we've gotten to this point, the register is always used/defined in
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* the same implementation so we can move it to be local to that
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* implementation.
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*/
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exec_node_remove(®->node);
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exec_list_push_tail(&impl->registers, ®->node);
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reg->index = impl->reg_alloc++;
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reg->is_global = false;
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return true;
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}
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bool
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nir_opt_global_to_local(nir_shader *shader)
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{
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bool progress = false;
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foreach_list_typed_safe(nir_register, reg, node, &shader->registers) {
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if (global_to_local(reg))
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progress = true;
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}
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return progress;
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}
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