From 9ec370f7489e45947db9449c842b87d773f08ee2 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 4 Feb 2009 18:18:58 +0000
Subject: [PATCH] Skip over zero registers.

llvm-svn: 63748
---
 llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
index f3ffc69cccbe..86dca115194a 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -2449,6 +2449,8 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
           if (!MO.isReg())
             continue;
           unsigned Reg = MO.getReg();
+          if (!Reg)
+            continue;
           if (TargetRegisterInfo::isVirtualRegister(Reg))
             DeadDefs.push_back(Reg);
           if (MO.isDead())