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ValueTracker can't assume that an alloca with no specified alignment

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will get its preferred alignment.  It has to be careful and cautiously assume
it will just get the ABI alignment.  This prevents instcombine from rounding
up the alignment of a load/store without adjusting the alignment of the alloca.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-01-08 19:28:38 +00:00
parent 1e407c338f
commit 0f2831c820
2 changed files with 27 additions and 1 deletions
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lib/Analysis/ValueTracking.cpp
+1 -1
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@@ -416,7 +416,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
unsigned Align = AI->getAlignment();
if (Align == 0 && TD) {
if (isa<AllocaInst>(AI))
Align = TD->getPrefTypeAlignment(AI->getType()->getElementType());
Align = TD->getABITypeAlignment(AI->getType()->getElementType());
else if (isa<MallocInst>(AI)) {
// Malloc returns maximally aligned memory.
Align = TD->getABITypeAlignment(AI->getType()->getElementType());