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| 5564 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * |
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| 4 | * Copyright (C) 2012-2013 LunarG, Inc. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the "Software"), |
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| 8 | * to deal in the Software without restriction, including without limitation |
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| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 11 | * Software is furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included |
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| 14 | * in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 21 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 22 | * DEALINGS IN THE SOFTWARE. |
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| 23 | * |
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| 24 | * Authors: |
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| 25 | * Chia-I Wu |
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| 26 | */ |
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| 27 | |||
| 28 | #include "toy_compiler.h" |
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| 29 | #include "toy_tgsi.h" |
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| 30 | #include "toy_optimize.h" |
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| 31 | |||
| 32 | /** |
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| 33 | * This just eliminates instructions with null dst so far. |
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| 34 | */ |
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| 35 | static void |
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| 36 | eliminate_dead_code(struct toy_compiler *tc) |
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| 37 | { |
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| 38 | struct toy_inst *inst; |
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| 39 | |||
| 40 | tc_head(tc); |
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| 41 | while ((inst = tc_next(tc)) != NULL) { |
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| 42 | switch (inst->opcode) { |
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| 43 | case GEN6_OPCODE_IF: |
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| 44 | case GEN6_OPCODE_ELSE: |
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| 45 | case GEN6_OPCODE_ENDIF: |
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| 46 | case GEN6_OPCODE_WHILE: |
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| 47 | case GEN6_OPCODE_BREAK: |
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| 48 | case GEN6_OPCODE_CONT: |
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| 49 | case GEN6_OPCODE_SEND: |
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| 50 | case GEN6_OPCODE_SENDC: |
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| 51 | case GEN6_OPCODE_NOP: |
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| 52 | /* never eliminated */ |
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| 53 | break; |
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| 54 | default: |
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| 55 | if (tdst_is_null(inst->dst) || !inst->dst.writemask) { |
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| 56 | /* math is always GEN6_COND_NORMAL */ |
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| 57 | if ((inst->opcode == GEN6_OPCODE_MATH || |
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| 58 | inst->cond_modifier == GEN6_COND_NONE) && |
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| 59 | !inst->acc_wr_ctrl) |
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| 60 | tc_discard_inst(tc, inst); |
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| 61 | } |
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| 62 | break; |
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| 63 | } |
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| 64 | } |
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| 65 | } |
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| 66 | |||
| 67 | void |
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| 68 | toy_compiler_optimize(struct toy_compiler *tc) |
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| 69 | { |
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| 70 | eliminate_dead_code(tc); |
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| 71 | } |