From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 4 Feb 2009 18:18:58 +0000 (+0000)
Subject: Skip over zero registers.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6792e90fec54921fc5ec72f876b80edd47636cd0;p=oota-llvm.git

Skip over zero registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63748 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index f3ffc69cccb..86dca115194 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/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())