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Use the new addEscapingValue callback to update GlobalsModRef when GVN adds PHIs of GEPs. For the moment,
have GlobalsModRef handle this conservatively by simply removing the value from its maps. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122787 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -152,6 +152,7 @@ namespace {
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virtual void deleteValue(Value *V);
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virtual void copyValue(Value *From, Value *To);
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virtual void addEscapingUse(Use &U);
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/// getAdjustedAnalysisPointer - This method is used when a pass implements
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/// an analysis interface through multiple inheritance. If needed, it
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@ -596,3 +597,13 @@ void GlobalsModRef::deleteValue(Value *V) {
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void GlobalsModRef::copyValue(Value *From, Value *To) {
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AliasAnalysis::copyValue(From, To);
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}
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void GlobalsModRef::addEscapingUse(Use &U) {
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// For the purposes of this analysis, it is conservatively correct to treat
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// a newly escaping value equivalently to a deleted one. We could perhaps
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// be more precise by processing the new use and attempting to update our
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// saved analysis results to accomodate it.
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deleteValue(U);
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AliasAnalysis::addEscapingUse(U);
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}
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@ -65,6 +65,7 @@ namespace {
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virtual void deleteValue(Value *V) {}
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virtual void copyValue(Value *From, Value *To) {}
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virtual void addEscapingUse(Use &U) {}
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/// getAdjustedAnalysisPointer - This method is used when a pass implements
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/// an analysis interface through multiple inheritance. If needed, it
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@ -1063,6 +1063,15 @@ static Value *ConstructSSAForLoadSet(LoadInst *LI,
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if (V->getType()->isPointerTy())
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for (unsigned i = 0, e = NewPHIs.size(); i != e; ++i)
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AA->copyValue(LI, NewPHIs[i]);
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// Now that we've copied information to the new PHIs, scan through
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// them again and inform alias analysis that we've added potentially
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// escaping uses to any values that are operands to these PHIs.
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for (unsigned i = 0, e = NewPHIs.size(); i != e; ++i) {
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PHINode *P = NewPHIs[i];
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for (unsigned ii = 0, ee = P->getNumIncomingValues(); ii != ee; ++ii)
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AA->addEscapingUse(P->getOperandUse(2*ii));
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}
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return V;
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}
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@ -1957,8 +1966,16 @@ bool GVN::performPRE(Function &F) {
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insert_table(ValNo, Phi, CurrentBlock);
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CurInst->replaceAllUsesWith(Phi);
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if (MD && Phi->getType()->isPointerTy())
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MD->invalidateCachedPointerInfo(Phi);
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if (Phi->getType()->isPointerTy()) {
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// Because we have added a PHI-use of the pointer value, it has now
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// "escaped" from alias analysis' perspective. We need to inform
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// AA of this.
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for (unsigned ii = 0, ee = Phi->getNumIncomingValues(); ii != ee; ++ii)
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VN.getAliasAnalysis()->addEscapingUse(Phi->getOperandUse(2*ii));
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if (MD)
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MD->invalidateCachedPointerInfo(Phi);
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}
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VN.erase(CurInst);
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erase_table(ValNo, CurInst, CurrentBlock);
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