From 392249fcf368a22f48091a16c180160221c7e89a Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Mon, 3 Jan 2011 23:51:43 +0000 Subject: 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 --- lib/Analysis/IPA/GlobalsModRef.cpp | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'lib/Analysis/IPA/GlobalsModRef.cpp') diff --git a/lib/Analysis/IPA/GlobalsModRef.cpp b/lib/Analysis/IPA/GlobalsModRef.cpp index c18dc47..116aaf4 100644 --- a/lib/Analysis/IPA/GlobalsModRef.cpp +++ b/lib/Analysis/IPA/GlobalsModRef.cpp @@ -152,6 +152,7 @@ namespace { virtual void deleteValue(Value *V); virtual void copyValue(Value *From, Value *To); + virtual void addEscapingUse(Use &U); /// getAdjustedAnalysisPointer - This method is used when a pass implements /// an analysis interface through multiple inheritance. If needed, it @@ -596,3 +597,13 @@ void GlobalsModRef::deleteValue(Value *V) { void GlobalsModRef::copyValue(Value *From, Value *To) { AliasAnalysis::copyValue(From, To); } + +void GlobalsModRef::addEscapingUse(Use &U) { + // For the purposes of this analysis, it is conservatively correct to treat + // a newly escaping value equivalently to a deleted one. We could perhaps + // be more precise by processing the new use and attempting to update our + // saved analysis results to accomodate it. + deleteValue(U); + + AliasAnalysis::addEscapingUse(U); +} -- cgit v1.1