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[LV/LoopAccesses] Backward dependences are not safe just because the

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accesses are via different types

Noticed this while generalizing the code for loop distribution.

I confirmed with Arnold that this was indeed a bug and managed to create
a testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230647 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet
2015-02-26 17:58:48 +00:00
parent 89e4328381
commit e382bb9e35
2 changed files with 52 additions and 2 deletions
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4
lib/Analysis/LoopAccessAnalysis.cpp
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@ -794,11 +794,10 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
assert(Val.isStrictlyPositive() && "Expect a positive value");
// Positive distance bigger than max vectorization factor.
if (ATy != BTy) {
DEBUG(dbgs() <<
"LAA: ReadWrite-Write positive dependency with different types\n");
return false;
return true;
}
unsigned Distance = (unsigned) Val.getZExtValue();
@ -820,6 +819,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
return true;
}
// Positive distance bigger than max vectorization factor.
MaxSafeDepDistBytes = Distance < MaxSafeDepDistBytes ?
Distance : MaxSafeDepDistBytes;