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Move this test a bit later, after the point at which we know that we either

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have an alloca or a parameter, since then the alloca test should make sense
to readers, while before it probably appears too specific.  No functionality
change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165306 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2012-10-05 07:29:46 +00:00
parent e66f3d3ba0
commit 3372c5a50f
1 changed files with 10 additions and 10 deletions
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20
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -605,16 +605,6 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy,
if (cpyLen < srcSize)
return false;
// Check that dest points to memory that is at least as aligned as src.
unsigned srcAlign = srcAlloca->getAlignment();
if (!srcAlign)
srcAlign = TD->getABITypeAlignment(srcAlloca->getAllocatedType());
bool isDestSufficientlyAligned = srcAlign <= cpyAlign;
// If dest is not aligned enough and we can't increase its alignment then
// bail out.
if (!isDestSufficientlyAligned && !isa<AllocaInst>(cpyDest))
return false;
// Check that accessing the first srcSize bytes of dest will not cause a
// trap. Otherwise the transform is invalid since it might cause a trap
// to occur earlier than it otherwise would.
@ -644,6 +634,16 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy,
return false;
}
// Check that dest points to memory that is at least as aligned as src.
unsigned srcAlign = srcAlloca->getAlignment();
if (!srcAlign)
srcAlign = TD->getABITypeAlignment(srcAlloca->getAllocatedType());
bool isDestSufficientlyAligned = srcAlign <= cpyAlign;
// If dest is not aligned enough and we can't increase its alignment then
// bail out.
if (!isDestSufficientlyAligned && !isa<AllocaInst>(cpyDest))
return false;
// Check that src is not accessed except via the call and the memcpy. This
// guarantees that it holds only undefined values when passed in (so the final
// memcpy can be dropped), that it is not read or written between the call and