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MemoryDependenceAnalysis attempts to find the first memory dependency for function calls.

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Currently, if GetLocation reports that it did not find a valid pointer (this is the case for volatile load/stores),
we ignore the result. This patch adds code to handle the cases where we did not obtain a valid pointer.

rdar://11872864  PR12899



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-08-13 23:03:43 +00:00
parent 6d2986cd03
commit 8dff60e96a
2 changed files with 41 additions and 2 deletions
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9
lib/Analysis/MemoryDependenceAnalysis.cpp
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@@ -227,13 +227,18 @@ getCallSiteDependencyFrom(CallSite CS, bool isReadOnlyCall,
// Otherwise if the two calls don't interact (e.g. InstCS is readnone)
// keep scanning.
break;
continue;
default:
return MemDepResult::getClobber(Inst);
}
}
// If we could not obtain a pointer for the instruction and the instruction
// touches memory then assume that this is a dependency.
if (MR != AliasAnalysis::NoModRef)
return MemDepResult::getClobber(Inst);
}
// No dependence found. If this is the entry block of the function, it is
// unknown, otherwise it is non-local.
if (BB != &BB->getParent()->getEntryBlock())