diff options
Diffstat (limited to 'llvm/lib/Analysis/ConstantFolding.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ConstantFolding.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index 010f5d6..60b94a9 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -90,6 +90,11 @@ Constant *FoldBitCast(Constant *C, Type *DestTy, const DataLayout &DL) { else Element = C->getAggregateElement(i); + if (Element && isa<UndefValue>(Element)) { + Result <<= BitShift; + continue; + } + auto *ElementCI = dyn_cast_or_null<ConstantInt>(Element); if (!ElementCI) return ConstantExpr::getBitCast(C, DestTy); @@ -180,7 +185,11 @@ Constant *FoldBitCast(Constant *C, Type *DestTy, const DataLayout &DL) { Constant *Elt = Zero; unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize*(Ratio-1); for (unsigned j = 0; j != Ratio; ++j) { - Constant *Src = dyn_cast<ConstantInt>(C->getAggregateElement(SrcElt++)); + Constant *Src = C->getAggregateElement(SrcElt++); + if (Src && isa<UndefValue>(Src)) + Src = Constant::getNullValue(SrcEltTy); + else + Src = dyn_cast_or_null<ConstantInt>(Src); if (!Src) // Reject constantexpr elements. return ConstantExpr::getBitCast(C, DestTy); @@ -206,7 +215,7 @@ Constant *FoldBitCast(Constant *C, Type *DestTy, const DataLayout &DL) { // Loop over each source value, expanding into multiple results. for (unsigned i = 0; i != NumSrcElt; ++i) { - auto *Src = dyn_cast<ConstantInt>(C->getAggregateElement(i)); + auto *Src = dyn_cast_or_null<ConstantInt>(C->getAggregateElement(i)); if (!Src) // Reject constantexpr elements. return ConstantExpr::getBitCast(C, DestTy); |