Cache TargetData/AliasAnalysis in the pass instead of calling

getAnalysis<>.  getAnalysis<> is apparently extremely expensive.
Doing this speeds up GVN on 403.gcc by 16%!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60304 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 3 deletions

diff --git a/include/llvm/Analysis/MemoryDependenceAnalysis.h b/include/llvm/Analysis/MemoryDependenceAnalysis.h
index 2dcec1b..c356981 100644
--- a/include/llvm/Analysis/MemoryDependenceAnalysis.h
+++ b/include/llvm/Analysis/MemoryDependenceAnalysis.h
@@ -25,6 +25,8 @@ namespace llvm {
   class FunctionPass;
   class Instruction;
   class CallSite;
+  class AliasAnalysis;
+  class TargetData;
   
   /// MemDepResult - A memory dependence query can return one of three different
   /// answers:
@@ -148,13 +150,15 @@ namespace llvm {
     // A reverse mapping form dependencies to the non-local dependees.
     ReverseDepMapType ReverseNonLocalDeps;
     
+    /// Current AA implementation, just a cache.
+    AliasAnalysis *AA;
+    TargetData *TD;
   public:
     MemoryDependenceAnalysis() : FunctionPass(&ID) {}
     static char ID;
 
-    /// Pass Implementation stuff.  This doesn't do any analysis.
-    ///
-    bool runOnFunction(Function &) {return false; }
+    /// Pass Implementation stuff.  This doesn't do any analysis eagerly.
+    bool runOnFunction(Function &);
     
     /// Clean up memory in between runs
     void releaseMemory() {