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[InstCombine] Avoid updating argument demanded elements in separate passes. 

As discussed on D17490, we should attempt to update an intrinsic's arguments demanded elements in one pass if we can.

llvm-svn: 267355
This commit is contained in:
Simon Pilgrim 2016-04-24 17:57:27 +00:00
parent d595d4265b
commit 1c9a9f255c
1 changed files with 15 additions and 7 deletions
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22
llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -1406,17 +1406,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
case Intrinsic::x86_sse2_ucomineq_sd: {
// These intrinsics only demand the 0th element of their input vectors. If
// we can simplify the input based on that, do so now.
bool MadeChange = false;
Value *Arg0 = II->getArgOperand(0);
Value *Arg1 = II->getArgOperand(1);
unsigned VWidth = Arg0->getType()->getVectorNumElements();
if (Value *V = SimplifyDemandedVectorEltsLow(Arg0, VWidth, 1)) {
II->setArgOperand(0, V);
return II;
MadeChange = true;
}
if (Value *V = SimplifyDemandedVectorEltsLow(Arg1, VWidth, 1)) {
II->setArgOperand(1, V);
return II;
MadeChange = true;
}
if (MadeChange)
return II;
break;
}
@ -1531,14 +1534,17 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// EXTRQ only uses the lowest 64-bits of the first 128-bit vector
// operands and the lowest 16-bits of the second.
bool MadeChange = false;
if (Value *V = SimplifyDemandedVectorEltsLow(Op0, VWidth0, 1)) {
II->setArgOperand(0, V);
return II;
MadeChange = true;
}
if (Value *V = SimplifyDemandedVectorEltsLow(Op1, VWidth1, 2)) {
II->setArgOperand(1, V);
return II;
MadeChange = true;
}
if (MadeChange)
return II;
break;
}
@ -1626,15 +1632,17 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// INSERTQI only uses the lowest 64-bits of the first two 128-bit vector
// operands.
bool MadeChange = false;
if (Value *V = SimplifyDemandedVectorEltsLow(Op0, VWidth0, 1)) {
II->setArgOperand(0, V);
return II;
MadeChange = true;
}
if (Value *V = SimplifyDemandedVectorEltsLow(Op1, VWidth1, 1)) {
II->setArgOperand(1, V);
return II;
MadeChange = true;
}
if (MadeChange)
return II;
break;
}