| 0,0 → 1,71 |
|---|
| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 2012-2013 LunarG, Inc. |
| * |
| * 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 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: |
| * Chia-I Wu <olv@lunarg.com> |
| */ |
| |
| #include "toy_compiler.h" |
| #include "toy_tgsi.h" |
| #include "toy_optimize.h" |
| |
| /** |
| * This just eliminates instructions with null dst so far. |
| */ |
| static void |
| eliminate_dead_code(struct toy_compiler *tc) |
| { |
| struct toy_inst *inst; |
| |
| tc_head(tc); |
| while ((inst = tc_next(tc)) != NULL) { |
| switch (inst->opcode) { |
| case BRW_OPCODE_IF: |
| case BRW_OPCODE_ELSE: |
| case BRW_OPCODE_ENDIF: |
| case BRW_OPCODE_WHILE: |
| case BRW_OPCODE_BREAK: |
| case BRW_OPCODE_CONTINUE: |
| case BRW_OPCODE_SEND: |
| case BRW_OPCODE_SENDC: |
| case BRW_OPCODE_NOP: |
| /* never eliminated */ |
| break; |
| default: |
| if (tdst_is_null(inst->dst) || !inst->dst.writemask) { |
| /* math is always BRW_CONDITIONAL_NONE */ |
| if ((inst->opcode == BRW_OPCODE_MATH || |
| inst->cond_modifier == BRW_CONDITIONAL_NONE) && |
| !inst->acc_wr_ctrl) |
| tc_discard_inst(tc, inst); |
| } |
| break; |
| } |
| } |
| } |
| |
| void |
| toy_compiler_optimize(struct toy_compiler *tc) |
| { |
| eliminate_dead_code(tc); |
| } |