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DenseMap: Appease -fstrict-aliasing on g++-4.4.

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With DenseMapInfo<Enum>, it is miscompiled on g++-4.4.

    static inline Enum getEmptyKey() { return Enum(<arbitrary int/unsigned value>); }

    isEauql(getEmptyKey(), ...)

The compiler mis-assumes the return value is not aliased to Enum.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171600 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi
2013-01-05 05:14:23 +00:00
parent 84be3d5a73
commit 5d295b41a3
1 changed files with 2 additions and 1 deletions
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3
include/llvm/ADT/DenseMap.h
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@@ -430,7 +430,8 @@ private:
incrementNumEntries(); incrementNumEntries();
// If we are writing over a tombstone, remember this. // If we are writing over a tombstone, remember this.
if (!KeyInfoT::isEqual(TheBucket->first, getEmptyKey())) const KeyT EmptyKey = getEmptyKey();
if (!KeyInfoT::isEqual(TheBucket->first, EmptyKey))
decrementNumTombstones(); decrementNumTombstones();
return TheBucket; return TheBucket;