diff options
| -rw-r--r-- | llvm/lib/VMCore/ConstantFolding.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/llvm/lib/VMCore/ConstantFolding.cpp b/llvm/lib/VMCore/ConstantFolding.cpp index 2a96291fe49..703a324126a 100644 --- a/llvm/lib/VMCore/ConstantFolding.cpp +++ b/llvm/lib/VMCore/ConstantFolding.cpp @@ -562,6 +562,17 @@ Constant *llvm::ConstantFoldCastInstruction(const Constant *V, return ConstantExpr::getCast(CE->getOperand(0), DestTy); } + // Check to see if we are casting an array of X to a pointer to X. If so, use + // a GEP to get to the first element of the array instead of a cast! + if (const PointerType *PTy = dyn_cast<PointerType>(V->getType())) + if (const ArrayType *ATy = dyn_cast<ArrayType>(PTy->getElementType())) + if (const PointerType *DPTy = dyn_cast<PointerType>(DestTy)) + if (DPTy->getElementType() == ATy->getElementType()) { + std::vector<Constant*> IdxList(2,Constant::getNullValue(Type::IntTy)); + return ConstantExpr::getGetElementPtr(const_cast<Constant*>(V), + IdxList); + } + ConstRules &Rules = ConstRules::get(V, V); switch (DestTy->getTypeID()) { |
