diff options
Diffstat (limited to 'clang/lib/CodeGen/CGExpr.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGExpr.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp index 301d577..01f2161 100644 --- a/clang/lib/CodeGen/CGExpr.cpp +++ b/clang/lib/CodeGen/CGExpr.cpp @@ -2297,9 +2297,13 @@ void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr, CGM.getABIInfo().getOptimalVectorMemoryType(VecTy, getLangOpts()); if (!ClangVecTy->isPackedVectorBoolType(getContext()) && VecTy != NewVecTy) { - SmallVector<int, 16> Mask(NewVecTy->getNumElements(), -1); + SmallVector<int, 16> Mask(NewVecTy->getNumElements(), + VecTy->getNumElements()); std::iota(Mask.begin(), Mask.begin() + VecTy->getNumElements(), 0); - Value = Builder.CreateShuffleVector(Value, Mask, "extractVec"); + // Use undef instead of poison for the padding lanes, to make sure no + // padding bits are poisoned, which may break coercion. + Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy), + Mask, "extractVec"); SrcTy = NewVecTy; } if (Addr.getElementType() != SrcTy) |