| /* |
| * Copyright (C) 2018 Alyssa Rosenzweig |
| * Copyright (C) 2019-2020 Collabora, Ltd. |
| * |
| * 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 "compiler.h" |
| #include "util/u_memory.h" |
| |
| bool |
| bi_opt_dead_code_eliminate(bi_context *ctx, bi_block *block) |
| { |
| bool progress = false; |
| unsigned temp_count = bi_max_temp(ctx); |
| |
| bi_invalidate_liveness(ctx); |
| bi_compute_liveness(ctx); |
| |
| uint16_t *live = mem_dup(block->base.live_out, temp_count * sizeof(uint16_t)); |
| |
| bi_foreach_instr_in_block_safe_rev(block, ins) { |
| if (ins->dest && !(ins->dest & BIR_SPECIAL)) { |
| if (!live[ins->dest]) { |
| bi_remove_instruction(ins); |
| progress |= true; |
| } |
| } |
| |
| bi_liveness_ins_update(live, ins, temp_count); |
| } |
| |
| free(live); |
| |
| return progress; |
| } |
