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When we promote a load of an argument make sure to take the alignment

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of the previous load - it's usually important.  For example, we don't want
to blindly turn an unaligned load into an aligned one.

llvm-svn: 99699
This commit is contained in:
Eric Christopher 2010-03-27 01:54:00 +00:00
parent 3f00f8044f
commit cf18deaea3
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/IPO/ArgumentPromotion.cpp
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@ -687,7 +687,11 @@ CallGraphNode *ArgPromotion::DoPromotion(Function *F,
Ops.clear();
AA.copyValue(OrigLoad->getOperand(0), V);
}
Args.push_back(new LoadInst(V, V->getName()+".val", Call));
// Since we're replacing a load make sure we take the alignment
// of the previous load.
LoadInst *newLoad = new LoadInst(V, V->getName()+".val", Call);
newLoad->setAlignment(OrigLoad->getAlignment());
Args.push_back(newLoad);
AA.copyValue(OrigLoad, Args.back());
}
}