diff options
Diffstat (limited to 'lib/IR/Constants.cpp')
-rw-r--r-- | lib/IR/Constants.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/IR/Constants.cpp b/lib/IR/Constants.cpp index bb8d60b234..aa26cff6a7 100644 --- a/lib/IR/Constants.cpp +++ b/lib/IR/Constants.cpp @@ -1698,6 +1698,19 @@ Constant *ConstantExpr::getAddrSpaceCast(Constant *C, Type *DstTy) { assert(CastInst::castIsValid(Instruction::AddrSpaceCast, C, DstTy) && "Invalid constantexpr addrspacecast!"); + // Canonicalize addrspacecasts between different pointer types by first + // bitcasting the pointer type and then converting the address space. + PointerType *SrcScalarTy = cast<PointerType>(C->getType()->getScalarType()); + PointerType *DstScalarTy = cast<PointerType>(DstTy->getScalarType()); + Type *DstElemTy = DstScalarTy->getElementType(); + if (SrcScalarTy->getElementType() != DstElemTy) { + Type *MidTy = PointerType::get(DstElemTy, SrcScalarTy->getAddressSpace()); + if (VectorType *VT = dyn_cast<VectorType>(DstTy)) { + // Handle vectors of pointers. + MidTy = VectorType::get(MidTy, VT->getNumElements()); + } + C = getBitCast(C, MidTy); + } return getFoldedCast(Instruction::AddrSpaceCast, C, DstTy); } |