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 GEN6_OPCODE_IF: |
case GEN6_OPCODE_ELSE: |
case GEN6_OPCODE_ENDIF: |
case GEN6_OPCODE_WHILE: |
case GEN6_OPCODE_BREAK: |
case GEN6_OPCODE_CONT: |
case GEN6_OPCODE_SEND: |
case GEN6_OPCODE_SENDC: |
case GEN6_OPCODE_NOP: |
/* never eliminated */ |
break; |
default: |
if (tdst_is_null(inst->dst) || !inst->dst.writemask) { |
/* math is always GEN6_COND_NORMAL */ |
if ((inst->opcode == GEN6_OPCODE_MATH || |
inst->cond_modifier == GEN6_COND_NONE) && |
!inst->acc_wr_ctrl) |
tc_discard_inst(tc, inst); |
} |
break; |
} |
} |
} |
|
void |
toy_compiler_optimize(struct toy_compiler *tc) |
{ |
eliminate_dead_code(tc); |
} |