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memset_pattern16 uses a 16 BYTE pattern, not a 16 BIT pattern. Add comments to that effect.

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llvm-svn: 139205
This commit is contained in:
Owen Anderson 2011-09-06 23:43:26 +00:00
parent 483f94e8d1
commit 9ae90800a2
1 changed files with 4 additions and 2 deletions
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6
lib/Analysis/BasicAliasAnalysis.cpp
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@ -847,11 +847,13 @@ BasicAliasAnalysis::getModRefInfo(ImmutableCallSite CS,
const Value *Src = CS.getArgument(1);
// If it can't overlap the source dest, then it doesn't modref the loc.
if (isNoAlias(Location(Dest, Len), Loc)) {
if (isNoAlias(Location(Src, 2), Loc))
// Always reads 16 bytes of the source.
if (isNoAlias(Location(Src, 16), Loc))
return NoModRef;
// If it can't overlap the dest, then worst case it reads the loc.
Min = Ref;
} else if (isNoAlias(Location(Src, 2), Loc)) {
// Always reads 16 bytes of the source.
} else if (isNoAlias(Location(Src, 16), Loc)) {
// If it can't overlap the source, then worst case it mutates the loc.
Min = Mod;
}