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Teach SimplifyDemandedBits how to look through fpext and fptrunc to simplify their operand

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160823 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2012-07-26 22:37:04 +00:00
parent 79ad138a33
commit 1121c786fc
2 changed files with 34 additions and 0 deletions
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lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+6
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@@ -1074,6 +1074,12 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts,
// like undef&0. The result is known zero, not undef.
UndefElts &= UndefElts2;
break;
case Instruction::FPTrunc:
case Instruction::FPExt:
TmpV = SimplifyDemandedVectorElts(I->getOperand(0), DemandedElts,
UndefElts, Depth+1);
if (TmpV) { I->setOperand(0, TmpV); MadeChange = true; }
break;
case Instruction::Call: {
IntrinsicInst *II = dyn_cast<IntrinsicInst>(I);