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Make ModRefBehavior a lattice. Use this to clean up AliasAnalysis

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chaining and simplify FunctionAttrs' GetModRefBehavior logic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-11-10 01:02:18 +00:00
parent cc8d10e1a8
commit 42c31a7073
8 changed files with 71 additions and 74 deletions
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2
lib/Analysis/AliasAnalysis.cpp
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@@ -179,7 +179,7 @@ AliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
// Otherwise, fall back to the next AA in the chain. But we can merge
// in any result we've managed to compute.
return std::min(AA->getModRefBehavior(CS), Min);
return ModRefBehavior(AA->getModRefBehavior(CS) & Min);
}
AliasAnalysis::ModRefBehavior