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X86 pmovsx/pmovzx ignore the upper half of their inputs.

Browse Source 
rdar://problem/6945110


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131493 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stuart Hastings
2011-05-17 22:13:31 +00:00
parent c81c9709ef
commit ca1ef48585
3 changed files with 38 additions and 1 deletions
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22
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@@ -588,6 +588,28 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
break;
}
case Intrinsic::x86_sse41_pmovsxbw:
case Intrinsic::x86_sse41_pmovsxwd:
case Intrinsic::x86_sse41_pmovsxdq:
case Intrinsic::x86_sse41_pmovzxbw:
case Intrinsic::x86_sse41_pmovzxwd:
case Intrinsic::x86_sse41_pmovzxdq: {
unsigned VWidth =
cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements();
unsigned LowHalfElts = VWidth / 2;
APInt InputDemandedElts(VWidth, 0);
InputDemandedElts = InputDemandedElts.getBitsSet(VWidth, 0, LowHalfElts);
APInt UndefElts(VWidth, 0);
if (Value *TmpV = SimplifyDemandedVectorElts(II->getArgOperand(0),
InputDemandedElts,
UndefElts)) {
II->setArgOperand(0, TmpV);
return II;
}
break;
}
case Intrinsic::ppc_altivec_vperm:
// Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant.
if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getArgOperand(2))) {