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Canonicalize addrspacecast ConstExpr between different pointer types

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As a follow-up to r210375 which canonicalizes addrspacecast
instructions, this patch canonicalizes addrspacecast constant
expressions.

Given clang uses ConstantExpr::getAddrSpaceCast to emit addrspacecast
cosntant expressions, this patch is also a step towards having the
frontend emit canonicalized addrspacecasts.

Piggyback a minor refactor in InstCombineCasts.cpp

Update three affected tests in addrspacecast-alias.ll,
access-non-generic.ll and constant-fold-gep.ll and added one new test in
constant-fold-address-space-pointer.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211004 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2014-06-15 21:40:57 +00:00
parent f9ef37a986
commit f6eb7e3175
7 changed files with 37 additions and 9 deletions
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6
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -1919,8 +1919,10 @@ Instruction *InstCombiner::visitAddrSpaceCast(AddrSpaceCastInst &CI) {
Type *DestElemTy = DestTy->getElementType();
if (SrcTy->getElementType() != DestElemTy) {
Type *MidTy = PointerType::get(DestElemTy, SrcTy->getAddressSpace());
if (CI.getType()->isVectorTy()) // Handle vectors of pointers.
MidTy = VectorType::get(MidTy, CI.getType()->getVectorNumElements());
if (VectorType *VT = dyn_cast<VectorType>(CI.getType())) {
// Handle vectors of pointers.
MidTy = VectorType::get(MidTy, VT->getNumElements());
}
Value *NewBitCast = Builder->CreateBitCast(Src, MidTy);
return new AddrSpaceCastInst(NewBitCast, CI.getType());