From 2f192c256c28f3b6c018f59e96380cd26f59c767 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 30 Oct 2009 20:12:24 +0000
Subject: [PATCH] Add option to createGVNPass to disable PRE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85609 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Transforms/Scalar.h | 2 +-
 lib/Transforms/Scalar/GVN.cpp    | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/llvm/Transforms/Scalar.h b/include/llvm/Transforms/Scalar.h
index f019d3512d5..e01b5dd746d 100644
--- a/include/llvm/Transforms/Scalar.h
+++ b/include/llvm/Transforms/Scalar.h
@@ -271,7 +271,7 @@ extern const PassInfo *const LCSSAID;
 // GVN - This pass performs global value numbering and redundant load 
 // elimination cotemporaneously.
 //
-FunctionPass *createGVNPass();
+FunctionPass *createGVNPass(bool NoPRE = false);
 
 //===----------------------------------------------------------------------===//
 //
diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index dd8859b5e84..33ad4e1059d 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -669,9 +669,10 @@ namespace {
     bool runOnFunction(Function &F);
   public:
     static char ID; // Pass identification, replacement for typeid
-    GVN() : FunctionPass(&ID) { }
+    GVN(bool nopre = false) : FunctionPass(&ID), NoPRE(nopre) { }
 
   private:
+    bool NoPRE;
     MemoryDependenceAnalysis *MD;
     DominatorTree *DT;
 
@@ -710,7 +711,7 @@ namespace {
 }
 
 // createGVNPass - The public interface to this file...
-FunctionPass *llvm::createGVNPass() { return new GVN(); }
+FunctionPass *llvm::createGVNPass(bool NoPRE) { return new GVN(NoPRE); }
 
 static RegisterPass<GVN> X("gvn",
                            "Global Value Numbering");