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r300/compiler: Add peephole optimization for the 'sub' presubtract operation

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This commit is contained in:
Tom Stellard
2010-09-06 10:57:20 -07:00
parent a64b4a05af
commit 564653b9f1
1 changed files with 17 additions and 8 deletions
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src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
+17 -8
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@@ -597,19 +597,32 @@ static int presub_helper(
return can_remove;
}
/* This function assumes that s->Inst->U.I.SrcReg[0] and
* s->Inst->U.I.SrcReg[1] aren't both negative. */
static void presub_replace_add(struct peephole_state *s,
struct rc_instruction * inst,
unsigned int src_index)
{
inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[0];
inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[1];
rc_presubtract_op presub_opcode;
if (s->Inst->U.I.SrcReg[1].Negate || s->Inst->U.I.SrcReg[0].Negate)
presub_opcode = RC_PRESUB_SUB;
else
presub_opcode = RC_PRESUB_ADD;
if (s->Inst->U.I.SrcReg[1].Negate) {
inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[1];
inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[0];
} else {
inst->U.I.PreSub.SrcReg[0] = s->Inst->U.I.SrcReg[0];
inst->U.I.PreSub.SrcReg[1] = s->Inst->U.I.SrcReg[1];
}
inst->U.I.PreSub.SrcReg[0].Negate = 0;
inst->U.I.PreSub.SrcReg[1].Negate = 0;
inst->U.I.PreSub.Opcode = RC_PRESUB_ADD;
inst->U.I.PreSub.Opcode = presub_opcode;
inst->U.I.SrcReg[src_index] = chain_srcregs(inst->U.I.SrcReg[src_index],
inst->U.I.PreSub.SrcReg[0]);
inst->U.I.SrcReg[src_index].File = RC_FILE_PRESUB;
inst->U.I.SrcReg[src_index].Index = RC_PRESUB_ADD;
inst->U.I.SrcReg[src_index].Index = presub_opcode;
}
static int peephole_add_presub_add(
@@ -648,10 +661,6 @@ static int peephole_add_presub_add(
if (!src1)
return 0;
/* XXX Only do add for now. */
if (src0->Negate)
return 0;
s.Inst = inst_add;
s.WriteMask = inst_add->U.I.DstReg.WriteMask;
if (presub_helper(c, &s, RC_PRESUB_ADD, presub_replace_add)) {