From b8cfe4ff411d92b150ce7ec6ec3568ad187dd517 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 25 Aug 2011 01:00:36 +0000
Subject: [PATCH] Add a command line option to disable global merge pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138536 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMTargetMachine.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index b006b0e2633..39552aca008 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -21,6 +21,11 @@
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
 
+static cl::opt<bool>
+EnableGlobalMerge("global-merge",
+                  cl::desc("Enable global merge pass"),
+                  cl::init(true));
+
 extern "C" void LLVMInitializeARMTarget() {
   // Register the target.
   RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
@@ -83,7 +88,7 @@ ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
 
 bool ARMBaseTargetMachine::addPreISel(PassManagerBase &PM,
                                       CodeGenOpt::Level OptLevel) {
-  if (OptLevel != CodeGenOpt::None)
+  if (OptLevel != CodeGenOpt::None && EnableGlobalMerge)
     PM.add(createARMGlobalMergePass(getTargetLowering()));
 
   return false;