commit 6cc1aeaad23b878fbf252efc3e45fb3a74a646eb
author Evan Cheng <evan.cheng@apple.com> Sat Mar 06 01:14:19 2010 +0000
committer Evan Cheng <evan.cheng@apple.com> Sat Mar 06 01:14:19 2010 +0000
tree 6c05558fcb8747babce52442351b38e9f4e38519
parent fc8ccfedbba651e324d827de6693aad1491314c7

Don't update physical register def.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97861 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineCSE.cpp

diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index af35a7a..b376e3d 100644
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/lib/CodeGen/MachineCSE.cpp
@@ -238,8 +238,9 @@
         continue;
       unsigned OldReg = MO.getReg();
       unsigned NewReg = CSMI->getOperand(i).getReg();
-      assert(OldReg != NewReg &&
-             TargetRegisterInfo::isVirtualRegister(OldReg) &&
+      if (OldReg == NewReg)
+        continue;
+      assert(TargetRegisterInfo::isVirtualRegister(OldReg) &&
              TargetRegisterInfo::isVirtualRegister(NewReg) &&
              "Do not CSE physical register defs!");
       MRI->replaceRegWith(OldReg, NewReg);