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slightly improve mod/ref for DSAA by checking the globals graph for fallback 

llvm-svn: 20868
This commit is contained in:
Chris Lattner 2005-03-26 22:47:03 +00:00
parent b3baff1830
commit 9cc932d3b3
1 changed files with 12 additions and 0 deletions
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12
llvm/lib/Analysis/DataStructure/DataStructureAA.cpp
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@ -222,6 +222,18 @@ DSAA::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
cast<GlobalVariable>(P)->getType()->getElementType()->isFirstClassType() &&
"This isn't a global that DSA inconsiderately dropped "
"from the graph?");
DSGraph &GG = *CallerTDGraph.getGlobalsGraph();
DSScalarMap::iterator NI = GG.getScalarMap().find(P);
if (NI != GG.getScalarMap().end() && !NI->second.isNull()) {
// Otherwise, if the node is only M or R, return this. This can be
// useful for globals that should be marked const but are not.
DSNode *N = NI->second.getNode();
if (!N->isModified())
Result = (ModRefResult)(Result & ~Mod);
if (!N->isRead())
Result = (ModRefResult)(Result & ~Ref);
}
}
return Result;
}