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[DAGCombiner] Remove some dead code from ConstantFoldBITCASTofBUILD_VECTOR 

This code handled SCALAR_TO_VECTOR being returned by the recursion, but the code that used to return SCALAR_TO_VECTOR was removed in 2015.

llvm-svn: 342856
This commit is contained in:
Craig Topper 2018-09-24 02:03:11 +00:00
parent 255f376f6b
commit 5bef27e808
1 changed files with 2 additions and 9 deletions
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11
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -10109,15 +10109,6 @@ ConstantFoldBITCASTofBUILD_VECTOR(SDNode *BV, EVT DstEltVT) {
// If this is a conversion of N elements of one type to N elements of another
// type, convert each element. This handles FP<->INT cases.
if (SrcBitSize == DstBitSize) {
EVT VT = EVT::getVectorVT(*DAG.getContext(), DstEltVT,
BV->getValueType(0).getVectorNumElements());
// Due to the FP element handling below calling this routine recursively,
// we can end up with a scalar-to-vector node here.
if (BV->getOpcode() == ISD::SCALAR_TO_VECTOR)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(BV), VT,
DAG.getBitcast(DstEltVT, BV->getOperand(0)));
SmallVector<SDValue, 8> Ops;
for (SDValue Op : BV->op_values()) {
// If the vector element type is not legal, the BUILD_VECTOR operands
@ -10127,6 +10118,8 @@ ConstantFoldBITCASTofBUILD_VECTOR(SDNode *BV, EVT DstEltVT) {
Ops.push_back(DAG.getBitcast(DstEltVT, Op));
AddToWorklist(Ops.back().getNode());
}
EVT VT = EVT::getVectorVT(*DAG.getContext(), DstEltVT,
BV->getValueType(0).getVectorNumElements());
return DAG.getBuildVector(VT, SDLoc(BV), Ops);
}