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simplify this function a bit, allow DS-AA to build on/improve the mod/ref

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results returned by AA, not just use one or the other.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-03-17 20:16:58 +00:00
parent 94f8470fe3
commit 50cb9b40c2
1 changed files with 11 additions and 8 deletions
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19
lib/Analysis/DataStructure/DataStructureAA.cpp
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@ -173,9 +173,11 @@ AliasAnalysis::AliasResult DSAA::alias(const Value *V1, unsigned V1Size,
///
AliasAnalysis::ModRefResult
DSAA::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
AliasAnalysis::ModRefResult Result =AliasAnalysis::getModRefInfo(CS, P, Size);
Function *F = CS.getCalledFunction();
if (!F || F->isExternal())
return AliasAnalysis::getModRefInfo(CS, P, Size);
if (!F || F->isExternal() || Result == NoModRef)
return Result;
// Clone the function TD graph, clearing off Mod/Ref flags
const Function *csParent = CS.getInstruction()->getParent()->getParent();
@ -189,12 +191,13 @@ DSAA::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
// Report the flags that have been added
const DSNodeHandle &DSH = TDGraph.getNodeForValue(P);
if (const DSNode *N = DSH.getNode())
if (N->isModified())
return N->isRead() ? ModRef : Mod;
else
return N->isRead() ? Ref : NoModRef;
return NoModRef;
if (const DSNode *N = DSH.getNode()) {
if (!N->isModified()) // We proved it was not modified.
Result = ModRefResult(Result & ~Mod);
if (!N->isRead()) // We proved it was not read.
Result = ModRefResult(Result & ~Ref);
}
return Result;
}