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[InstCombine] reduce duplicated code; NFC 

llvm-svn: 370399
This commit is contained in:
Sanjay Patel 2019-08-29 19:36:18 +00:00
parent f9f81289e6
commit 65f1c04000
1 changed files with 13 additions and 10 deletions
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23
llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -2391,26 +2391,29 @@ Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
}
}
if (ShuffleVectorInst *SVI = dyn_cast<ShuffleVectorInst>(Src)) {
if (auto *Shuf = dyn_cast<ShuffleVectorInst>(Src)) {
// Okay, we have (bitcast (shuffle ..)). Check to see if this is
// a bitcast to a vector with the same # elts.
if (SVI->hasOneUse() && DestTy->isVectorTy() &&
DestTy->getVectorNumElements() == SVI->getType()->getNumElements() &&
SVI->getType()->getNumElements() ==
SVI->getOperand(0)->getType()->getVectorNumElements()) {
Value *ShufOp0 = Shuf->getOperand(0);
Value *ShufOp1 = Shuf->getOperand(1);
unsigned NumShufElts = Shuf->getType()->getVectorNumElements();
unsigned NumSrcVecElts = ShufOp0->getType()->getVectorNumElements();
if (Shuf->hasOneUse() && DestTy->isVectorTy() &&
DestTy->getVectorNumElements() == NumShufElts &&
NumShufElts == NumSrcVecElts) {
BitCastInst *Tmp;
// If either of the operands is a cast from CI.getType(), then
// evaluating the shuffle in the casted destination's type will allow
// us to eliminate at least one cast.
if (((Tmp = dyn_cast<BitCastInst>(SVI->getOperand(0))) &&
if (((Tmp = dyn_cast<BitCastInst>(ShufOp0)) &&
Tmp->getOperand(0)->getType() == DestTy) ||
((Tmp = dyn_cast<BitCastInst>(SVI->getOperand(1))) &&
((Tmp = dyn_cast<BitCastInst>(ShufOp1)) &&
Tmp->getOperand(0)->getType() == DestTy)) {
Value *LHS = Builder.CreateBitCast(SVI->getOperand(0), DestTy);
Value *RHS = Builder.CreateBitCast(SVI->getOperand(1), DestTy);
Value *LHS = Builder.CreateBitCast(ShufOp0, DestTy);
Value *RHS = Builder.CreateBitCast(ShufOp1, DestTy);
// Return a new shuffle vector. Use the same element ID's, as we
// know the vector types match #elts.
return new ShuffleVectorInst(LHS, RHS, SVI->getOperand(2));
return new ShuffleVectorInst(LHS, RHS, Shuf->getOperand(2));
}
}
}