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aco: optimize a*0.0

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fossil-db (GFX10):
Totals from 1943 (1.39% of 139391) affected shaders:
SGPRs: 99952 -> 99544 (-0.41%); split: -0.44%, +0.03%
VGPRs: 60880 -> 60272 (-1.00%); split: -1.02%, +0.02%
CodeSize: 5138488 -> 5107500 (-0.60%); split: -0.61%, +0.01%
MaxWaves: 32193 -> 32380 (+0.58%)
Instrs: 983178 -> 975684 (-0.76%); split: -0.77%, +0.01%

fossil-db (GFX10.3):
Totals from 1943 (1.39% of 139391) affected shaders:
SGPRs: 99832 -> 99648 (-0.18%); split: -0.25%, +0.06%
VGPRs: 64708 -> 63944 (-1.18%); split: -1.27%, +0.09%
CodeSize: 5196732 -> 5157632 (-0.75%); split: -0.76%, +0.00%
MaxWaves: 27478 -> 27486 (+0.03%); split: +0.06%, -0.03%
Instrs: 1007222 -> 998737 (-0.84%); split: -0.84%, +0.00%

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5523>
This commit is contained in:
Rhys Perry 2020-06-17 14:57:57 +01:00
parent 2849f0b5aa
commit 54a09545ec
1 changed files with 3 additions and 0 deletions
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3
src/amd/compiler/aco_optimizer.cpp
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@ -1316,6 +1316,9 @@ void label_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
!(fp16 ? block.fp_mode.must_flush_denorms16_64 : block.fp_mode.must_flush_denorms32) &&
!instr->definitions[0].isPrecise()) { /* 1.0 */
ctx.info[instr->definitions[0].tempId()].set_temp(instr->operands[i].getTemp());
} else if (instr->operands[!i].constantValue() == 0u &&
!(fp16 ? block.fp_mode.preserve_signed_zero_inf_nan16_64 : block.fp_mode.preserve_signed_zero_inf_nan32)) { /* 0.0 */
ctx.info[instr->definitions[0].tempId()].set_constant(ctx.program->chip_class, 0u);
} else {
continue;
}