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when merging two alias sets, the result set is volatile if either

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of the sets is volatile.  We were dropping the volatile bit of the
merged in set, leading (luckily) to assertions in cases like 
PR7535.  I cannot produce a testcase that repros with opt, but this
is obviously correct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112402 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-29 04:14:47 +00:00
parent 9476d746d6
commit fedac7d9b0
1 changed files with 1 additions and 0 deletions
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lib/Analysis/AliasSetTracker.cpp
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@ -35,6 +35,7 @@ void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) {
// Update the alias and access types of this set...
AccessTy |= AS.AccessTy;
AliasTy |= AS.AliasTy;
Volatile |= AS.Volatile;
if (AliasTy == MustAlias) {
// Check that these two merged sets really are must aliases. Since both