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a minor tweak to my previous patch, handle the invalidation case 

when there are multiple iterations of the loop.  This fixes PR3375.

llvm-svn: 62822
This commit is contained in:
Chris Lattner 2009-01-23 00:27:03 +00:00
parent 48abf2380b
commit 706d40e662
1 changed files with 4 additions and 3 deletions
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7
llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -751,9 +751,10 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
// cache remains sorted. Sort it now (if needed) so that recursive
// invocations of getNonLocalPointerDepFromBB that could reuse the cache
// value will only see properly sorted cache arrays.
if (NumSortedEntries != Cache->size()) {
if (Cache && NumSortedEntries != Cache->size()) {
std::sort(Cache->begin(), Cache->end());
NumSortedEntries = Cache->size();
Cache = 0;
}
// FIXME: it is entirely possible that PHI translating will end up with
@ -767,12 +768,12 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
Result, Visited))
goto PredTranslationFailure;
}
// Refresh the CacheInfo/Cache pointer so that it isn't invalidated.
CacheInfo = &NonLocalPointerDeps[CacheKey];
Cache = &CacheInfo->second;
NumSortedEntries = Cache->size();
// Since we did phi translation, the "Cache" set won't contain all of the
// results for the query. This is ok (we can still use it to accelerate
// specific block queries) but we can't do the fastpath "return all