From 76a4d58998ca41d04f03d21afe0257c36d9ce303 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 17 Jul 2008 19:48:53 +0000
Subject: Subreg live interval valno may not have a corresponding def
 machineinstr since it's less precise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53734 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SimpleRegisterCoalescing.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index bc83363..5b7f55d 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -1327,7 +1327,7 @@ bool SimpleRegisterCoalescing::RangeIsDefinedByCopyFromReg(LiveInterval &li,
     // Re-compute it.
     MachineInstr *DefMI = li_->getInstructionFromIndex(LR->start);
     unsigned SrcReg, DstReg;
-    if (tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
+    if (DefMI && tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
         DstReg == li.reg && SrcReg == Reg) {
       // Cache computed info.
       LR->valno->def  = LR->start;
-- 
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