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Make ModRefBehavior a lattice. Use this to clean up AliasAnalysis

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chaining and simplify FunctionAttrs' GetModRefBehavior logic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-11-10 01:02:18 +00:00
parent cc8d10e1a8
commit 42c31a7073
8 changed files with 71 additions and 74 deletions
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29
lib/Analysis/IPA/GlobalsModRef.cpp
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@ -120,28 +120,33 @@ namespace {
/// called from the specified call site. The call site may be null in which
/// case the most generic behavior of this function should be returned.
ModRefBehavior getModRefBehavior(const Function *F) {
ModRefBehavior Min = UnknownModRefBehavior;
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
return DoesNotAccessMemory;
Min = DoesNotAccessMemory;
else if ((FR->FunctionEffect & Mod) == 0)
return OnlyReadsMemory;
Min = OnlyReadsMemory;
}
return AliasAnalysis::getModRefBehavior(F);
return ModRefBehavior(AliasAnalysis::getModRefBehavior(F) & Min);
}
/// getModRefBehavior - Return the behavior of the specified function if
/// called from the specified call site. The call site may be null in which
/// case the most generic behavior of this function should be returned.
ModRefBehavior getModRefBehavior(ImmutableCallSite CS) {
const Function* F = CS.getCalledFunction();
if (!F) return AliasAnalysis::getModRefBehavior(CS);
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
return DoesNotAccessMemory;
else if ((FR->FunctionEffect & Mod) == 0)
return OnlyReadsMemory;
}
return AliasAnalysis::getModRefBehavior(CS);
ModRefBehavior Min = UnknownModRefBehavior;
if (const Function* F = CS.getCalledFunction())
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
Min = DoesNotAccessMemory;
else if ((FR->FunctionEffect & Mod) == 0)
Min = OnlyReadsMemory;
}
return ModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min);
}
virtual void deleteValue(Value *V);