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[InstCombine] Don't fold bitcast into store if it would need addrspacecast

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Summary:
Previously the code didn't check if the before and after types for the
store were pointers to different address spaces. This resulted in
instcombine using a bitcast to convert between pointers to different
address spaces, causing an assertion due to the invalid cast.

It is not be appropriate to use addrspacecast this case because it is
not guaranteed to be a no-op cast. Instead bail out and do not do the
transformation.

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D3117

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204733 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne
2014-03-25 17:21:41 +00:00
parent 902c799d96
commit 67cb554e65
2 changed files with 32 additions and 6 deletions
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lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+16 -4
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@@ -508,15 +508,27 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
if (!SrcPTy->isIntegerTy() && !SrcPTy->isPointerTy())
return 0;
// If the pointers point into different address spaces or if they point to
// values with different sizes, we can't do the transformation.
// If the pointers point into different address spaces don't do the
// transformation.
if (SrcTy->getAddressSpace() !=
cast<PointerType>(CI->getType())->getAddressSpace())
return 0;
// If the pointers point to values of different sizes don't do the
// transformation.
if (!IC.getDataLayout() ||
SrcTy->getAddressSpace() !=
cast<PointerType>(CI->getType())->getAddressSpace() ||
IC.getDataLayout()->getTypeSizeInBits(SrcPTy) !=
IC.getDataLayout()->getTypeSizeInBits(DestPTy))
return 0;
// If the pointers point to pointers to different address spaces don't do the
// transformation. It is not safe to introduce an addrspacecast instruction in
// this case since, depending on the target, addrspacecast may not be a no-op
// cast.
if (SrcPTy->isPointerTy() && DestPTy->isPointerTy() &&
SrcPTy->getPointerAddressSpace() != DestPTy->getPointerAddressSpace())
return 0;
// Okay, we are casting from one integer or pointer type to another of
// the same size. Instead of casting the pointer before
// the store, cast the value to be stored.