From 30093b5d8b4624f7b07f93cc76c211a9b350568f Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Thu, 3 Jun 2010 18:28:31 +0000
Subject: Revert 105308.

llvm-svn: 105399
---
 llvm/lib/CodeGen/MachineCSE.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/MachineCSE.cpp')

diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index d8e2ec64da8..6f4f7a88340 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -31,6 +31,9 @@ using namespace llvm;
 STATISTIC(NumCoalesces, "Number of copies coalesced");
 STATISTIC(NumCSEs,      "Number of common subexpression eliminated");
 
+static cl::opt<bool> CSEPhysDef("machine-cse-phys-defs",
+                                cl::init(false), cl::Hidden);
+
 namespace {
   class MachineCSE : public MachineFunctionPass {
     const TargetInstrInfo *TII;
@@ -373,7 +376,7 @@ bool MachineCSE::ProcessBlock(MachineBasicBlock *MBB) {
 
       // ... Unless the CS is local and it also defines the physical register
       // which is not clobbered in between.
-      if (PhysDef) {
+      if (PhysDef && CSEPhysDef) {
         unsigned CSVN = VNT.lookup(MI);
         MachineInstr *CSMI = Exps[CSVN];
         if (PhysRegDefReaches(CSMI, MI, PhysDef))
-- 
cgit v1.2.3