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i965/fs: Add a couple more algebraic cases that help some ARB_fp patterns.

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ARB_fp doesn't go through the GLSL optimizer, and these were things you see
frequently thanks to conditionals being lowered to SLT/SGE and MUL.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt
2012-09-20 11:06:07 +02:00
parent d81d7a4b65
commit 9cfc00a84c
1 changed files with 23 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs.cpp
+23
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@@ -1435,7 +1435,30 @@ fs_visitor::opt_algebraic()
break;
}
/* a * 0.0 = 0.0 */
if (inst->src[1].type == BRW_REGISTER_TYPE_F &&
inst->src[1].imm.f == 0.0) {
inst->opcode = BRW_OPCODE_MOV;
inst->src[0] = fs_reg(0.0f);
inst->src[1] = reg_undef;
progress = true;
break;
}
break;
case BRW_OPCODE_ADD:
if (inst->src[1].file != IMM)
continue;
/* a + 0.0 = a */
if (inst->src[1].type == BRW_REGISTER_TYPE_F &&
inst->src[1].imm.f == 0.0) {
inst->opcode = BRW_OPCODE_MOV;
inst->src[1] = reg_undef;
progress = true;
break;
}
break;
default:
break;
}