| /* |
| * Copyright © 2014 Intel Corporation |
| * |
| * 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. |
| * |
| * Authors: |
| * Connor Abbott (cwabbott0@gmail.com) |
| * |
| */ |
| |
| #include "nir.h" |
| |
| static bool |
| global_to_local(nir_register *reg) |
| { |
| nir_function_impl *impl = NULL; |
| |
| assert(reg->is_global); |
| |
| nir_foreach_def(def_dest, reg) { |
| nir_instr *instr = def_dest->reg.parent_instr; |
| nir_function_impl *instr_impl = |
| nir_cf_node_get_function(&instr->block->cf_node); |
| if (impl != NULL) { |
| if (impl != instr_impl) |
| return false; |
| } else { |
| impl = instr_impl; |
| } |
| } |
| |
| nir_foreach_use(use_src, reg) { |
| nir_instr *instr = use_src->parent_instr; |
| nir_function_impl *instr_impl = |
| nir_cf_node_get_function(&instr->block->cf_node); |
| if (impl != NULL) { |
| if (impl != instr_impl) |
| return false; |
| } else { |
| impl = instr_impl; |
| } |
| } |
| |
| nir_foreach_if_use(use_src, reg) { |
| nir_if *if_stmt = use_src->parent_if; |
| nir_function_impl *if_impl = nir_cf_node_get_function(&if_stmt->cf_node); |
| if (impl != NULL) { |
| if (impl != if_impl) |
| return false; |
| } else { |
| impl = if_impl; |
| } |
| } |
| |
| if (impl == NULL) { |
| /* this instruction is never used/defined, delete it */ |
| nir_reg_remove(reg); |
| return true; |
| } |
| |
| /* |
| * if we've gotten to this point, the register is always used/defined in |
| * the same implementation so we can move it to be local to that |
| * implementation. |
| */ |
| |
| exec_node_remove(®->node); |
| exec_list_push_tail(&impl->registers, ®->node); |
| reg->index = impl->reg_alloc++; |
| reg->is_global = false; |
| return true; |
| } |
| |
| bool |
| nir_opt_global_to_local(nir_shader *shader) |
| { |
| bool progress = false; |
| |
| foreach_list_typed_safe(nir_register, reg, node, &shader->registers) { |
| if (global_to_local(reg)) |
| progress = true; |
| } |
| |
| return progress; |
| } |