Identify Analysis pass.
Do not run analysis pass again if analysis info is still available.
This fixes PR1441.
llvm-svn: 48476
diff --git a/llvm/lib/Analysis/LoadValueNumbering.cpp b/llvm/lib/Analysis/LoadValueNumbering.cpp
index 0a2f36b..6dd55a4 100644
--- a/llvm/lib/Analysis/LoadValueNumbering.cpp
+++ b/llvm/lib/Analysis/LoadValueNumbering.cpp
@@ -43,6 +43,9 @@
static char ID; // Class identification, replacement for typeinfo
LoadVN() : FunctionPass((intptr_t)&ID) {}
+ /// isAnalysis - Return true if this pass is implementing an analysis pass.
+ virtual bool isAnalysis() const { return true; }
+
/// Pass Implementation stuff. This doesn't do any analysis.
///
bool runOnFunction(Function &) { return false; }