diff options
Diffstat (limited to 'lib/Analysis/ConstantFolding.cpp')
-rw-r--r-- | lib/Analysis/ConstantFolding.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp index d74d7e806e..7a8c703040 100644 --- a/lib/Analysis/ConstantFolding.cpp +++ b/lib/Analysis/ConstantFolding.cpp @@ -46,7 +46,16 @@ using namespace llvm; static Constant *FoldBitCast(Constant *C, Type *DestTy, const TargetData &TD) { - // This only handles casts to vectors currently. + ConstantVector *CV = dyn_cast<ConstantVector>(C); + IntegerType *IntVTy = dyn_cast<IntegerType>(DestTy); + // When casting vectors to scalar integers, catch the + // obvious splat cases. + if (IntVTy && CV) { + if (CV->isNullValue()) return ConstantInt::getNullValue(IntVTy); + if (CV->isAllOnesValue()) return ConstantInt::getAllOnesValue(IntVTy); + } + + // The code below only handles casts to vectors currently. VectorType *DestVTy = dyn_cast<VectorType>(DestTy); if (DestVTy == 0) return ConstantExpr::getBitCast(C, DestTy); @@ -59,7 +68,6 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy, } // If this is a bitcast from constant vector -> vector, fold it. - ConstantVector *CV = dyn_cast<ConstantVector>(C); if (CV == 0) return ConstantExpr::getBitCast(C, DestTy); |