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i965: Convert CMP.GE -(abs)reg 0 -> CMP.Z reg 0. 

total instructions in shared programs: 5952059 -> 5951603 (-0.01%)
instructions in affected programs:     138812 -> 138356 (-0.33%)
GAINED:                                1
LOST:                                  0

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-01-05 13:51:03 -08:00
parent 40ae302a3c
commit 94e7b59a75
2 changed files with 24 additions and 0 deletions
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12
src/mesa/drivers/dri/i965/brw_fs.cpp
View File

@ -2367,6 +2367,18 @@ fs_visitor::opt_algebraic()
break;
}
break;
case BRW_OPCODE_CMP:
if (inst->conditional_mod == BRW_CONDITIONAL_GE &&
inst->src[0].abs &&
inst->src[0].negate &&
inst->src[1].is_zero()) {
inst->src[0].abs = false;
inst->src[0].negate = false;
inst->conditional_mod = BRW_CONDITIONAL_Z;
progress = true;
break;
}
break;
case BRW_OPCODE_SEL:
if (inst->src[0].equals(inst->src[1])) {
inst->opcode = BRW_OPCODE_MOV;

12
src/mesa/drivers/dri/i965/brw_vec4.cpp
View File

@ -693,6 +693,18 @@ vec4_visitor::opt_algebraic()
progress = true;
}
break;
case BRW_OPCODE_CMP:
if (inst->conditional_mod == BRW_CONDITIONAL_GE &&
inst->src[0].abs &&
inst->src[0].negate &&
inst->src[1].is_zero()) {
inst->src[0].abs = false;
inst->src[0].negate = false;
inst->conditional_mod = BRW_CONDITIONAL_Z;
progress = true;
break;
}
break;
case SHADER_OPCODE_RCP: {
vec4_instruction *prev = (vec4_instruction *)inst->prev;
if (prev->opcode == SHADER_OPCODE_SQRT) {