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Integrate the readonly/readnone logic more deeply

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into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-12-01 07:51:45 +00:00
parent e3110d0825
commit dff6710717
12 changed files with 122 additions and 90 deletions
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38
lib/Analysis/AliasSetTracker.cpp
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@@ -114,15 +114,13 @@ void AliasSet::addPointer(AliasSetTracker &AST, HashNodePair &Entry,
void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) {
CallSites.push_back(CS);
if (Function *F = CS.getCalledFunction()) {
AliasAnalysis::ModRefBehavior Behavior = AA.getModRefBehavior(F, CS);
if (Behavior == AliasAnalysis::DoesNotAccessMemory)
return;
else if (Behavior == AliasAnalysis::OnlyReadsMemory) {
AliasTy = MayAlias;
AccessTy |= Refs;
return;
}
AliasAnalysis::ModRefBehavior Behavior = AA.getModRefBehavior(CS);
if (Behavior == AliasAnalysis::DoesNotAccessMemory)
return;
else if (Behavior == AliasAnalysis::OnlyReadsMemory) {
AliasTy = MayAlias;
AccessTy |= Refs;
return;
}
// FIXME: This should use mod/ref information to make this not suck so bad
@@ -166,9 +164,8 @@ bool AliasSet::aliasesPointer(const Value *Ptr, unsigned Size,
}
bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return false;
if (AA.doesNotAccessMemory(CS))
return false;
if (AA.hasNoModRefInfoForCalls())
return true;
@@ -297,9 +294,8 @@ bool AliasSetTracker::add(FreeInst *FI) {
bool AliasSetTracker::add(CallSite CS) {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return true; // doesn't alias anything
if (AA.doesNotAccessMemory(CS))
return true; // doesn't alias anything
AliasSet *AS = findAliasSetForCallSite(CS);
if (!AS) {
@@ -419,9 +415,8 @@ bool AliasSetTracker::remove(FreeInst *FI) {
}
bool AliasSetTracker::remove(CallSite CS) {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return false; // doesn't alias anything
if (AA.doesNotAccessMemory(CS))
return false; // doesn't alias anything
AliasSet *AS = findAliasSetForCallSite(CS);
if (!AS) return false;
@@ -455,13 +450,10 @@ void AliasSetTracker::deleteValue(Value *PtrVal) {
// If this is a call instruction, remove the callsite from the appropriate
// AliasSet.
CallSite CS = CallSite::get(PtrVal);
if (CS.getInstruction()) {
Function *F = CS.getCalledFunction();
if (!F || !AA.doesNotAccessMemory(F)) {
if (CS.getInstruction())
if (!AA.doesNotAccessMemory(CS))
if (AliasSet *AS = findAliasSetForCallSite(CS))
AS->removeCallSite(CS);
}
}
// First, look up the PointerRec for this pointer.
hash_map<Value*, AliasSet::PointerRec>::iterator I = PointerMap.find(PtrVal);