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Enhance the memdep interface so that users can tell the difference between a dependency which cannot be calculated and a path reaching the entry point of the function. This patch introduces isNonFuncLocal, which replaces isUnknown in some cases.

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Patch by Xiaoyi Guo.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141896 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-10-13 22:14:57 +00:00
parent 48ba0e45ed
commit b414142036
6 changed files with 107 additions and 61 deletions
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lib/Analysis/MemoryDependenceAnalysis.cpp
+5 -5
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@@ -238,7 +238,7 @@ getCallSiteDependencyFrom(CallSite CS, bool isReadOnlyCall,
// unknown, otherwise it is non-local.
if (BB != &BB->getParent()->getEntryBlock())
return MemDepResult::getNonLocal();
return MemDepResult::getUnknown();
return MemDepResult::getNonFuncLocal();
}
/// isLoadLoadClobberIfExtendedToFullWidth - Return true if LI is a load that
@@ -499,7 +499,7 @@ getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad,
// unknown, otherwise it is non-local.
if (BB != &BB->getParent()->getEntryBlock())
return MemDepResult::getNonLocal();
return MemDepResult::getUnknown();
return MemDepResult::getNonFuncLocal();
}
/// getDependency - Return the instruction on which a memory operation
@@ -532,7 +532,7 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
if (QueryParent != &QueryParent->getParent()->getEntryBlock())
LocalCache = MemDepResult::getNonLocal();
else
LocalCache = MemDepResult::getUnknown();
LocalCache = MemDepResult::getNonFuncLocal();
} else {
AliasAnalysis::Location MemLoc;
AliasAnalysis::ModRefResult MR = GetLocation(QueryInst, MemLoc, AA);
@@ -688,7 +688,7 @@ MemoryDependenceAnalysis::getNonLocalCallDependency(CallSite QueryCS) {
// a clobber, otherwise it is unknown.
Dep = MemDepResult::getNonLocal();
} else {
Dep = MemDepResult::getUnknown();
Dep = MemDepResult::getNonFuncLocal();
}
// If we had a dirty entry for the block, update it. Otherwise, just add
@@ -806,7 +806,7 @@ GetNonLocalInfoForBlock(const AliasAnalysis::Location &Loc,
// If the block has a dependency (i.e. it isn't completely transparent to
// the value), remember the reverse association because we just added it
// to Cache!
if (Dep.isNonLocal() || Dep.isUnknown())
if (!Dep.isDef() && !Dep.isClobber())
return Dep;
// Keep the ReverseNonLocalPtrDeps map up to date so we can efficiently