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Teach instcombine about the rest of the SSE and SSE2 conversion

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intrinsics element dependencies. Reviewed by Nick.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123161 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2011-01-10 07:19:37 +00:00
parent c9df025e33
commit 9cc9f50abc
2 changed files with 66 additions and 4 deletions
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15
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -540,9 +540,16 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
return new StoreInst(II->getArgOperand(1), Ptr);
}
break;
case Intrinsic::x86_sse_cvttss2si: {
// These intrinsics only demands the 0th element of its input vector. If
case Intrinsic::x86_sse_cvtss2si:
case Intrinsic::x86_sse_cvtss2si64:
case Intrinsic::x86_sse_cvttss2si:
case Intrinsic::x86_sse_cvttss2si64:
case Intrinsic::x86_sse2_cvtsd2si:
case Intrinsic::x86_sse2_cvtsd2si64:
case Intrinsic::x86_sse2_cvttsd2si:
case Intrinsic::x86_sse2_cvttsd2si64: {
// These intrinsics only demand the 0th element of their input vectors. If
// we can simplify the input based on that, do so now.
unsigned VWidth =
cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements();
@ -555,7 +562,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
}
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))) {