Identify Analysis pass.

Do not run analysis pass again if analysis info is still available.
This fixes PR1441.

llvm-svn: 48476

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/AliasAnalysisCounter.cpp b/llvm/lib/Analysis/AliasAnalysisCounter.cpp
index 374625311f5..8b35ea8370c 100644
--- a/llvm/lib/Analysis/AliasAnalysisCounter.cpp
+++ b/llvm/lib/Analysis/AliasAnalysisCounter.cpp
@@ -72,6 +72,9 @@ namespace {
       }
     }
 
+    /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+    virtual bool isAnalysis() const { return true; }
+
     bool runOnModule(Module &M) {
       this->M = &M;
       InitializeAliasAnalysis(this);