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r300/compiler: remove an unused-but-set variable and simplify the code

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(cherry picked from commit ed5e95ada6)
This commit is contained in:
Marek Olšák 2011-07-15 20:52:16 +02:00
parent f69357d77a
commit e33f306d67
1 changed files with 6 additions and 9 deletions
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15
src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
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@ -560,7 +560,7 @@ static int peephole_add_presub_add(
struct radeon_compiler * c,
struct rc_instruction * inst_add)
{
struct rc_src_register * src0 = NULL;
unsigned dstmask = inst_add->U.I.DstReg.WriteMask;
struct rc_src_register * src1 = NULL;
unsigned int i;
@ -570,18 +570,15 @@ static int peephole_add_presub_add(
if (inst_add->U.I.SrcReg[0].Swizzle != inst_add->U.I.SrcReg[1].Swizzle)
return 0;
/* src0 and src1 can't have absolute values only one can be negative and they must be all negative or all positive. */
/* XXX This isn't fully implemented, is it? */
/* src0 and src1 can't have absolute values only one can be negative and they must be all negative or all positive. */
for (i = 0; i < 2; i++) {
if (inst_add->U.I.SrcReg[i].Abs)
return 0;
if ((inst_add->U.I.SrcReg[i].Negate
& inst_add->U.I.DstReg.WriteMask) ==
inst_add->U.I.DstReg.WriteMask) {
src0 = &inst_add->U.I.SrcReg[i];
} else if (!src1) {
/* XXX This looks weird, but it's basically what was here before this commit (see git blame): */
if ((inst_add->U.I.SrcReg[i].Negate & dstmask) != dstmask && !src1) {
src1 = &inst_add->U.I.SrcReg[i];
} else {
src0 = &inst_add->U.I.SrcReg[i];
}
}