From 6ade93bbdceac28f441cfdc2571929a866eb7d24 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 5 Aug 2009 03:53:14 +0000
Subject: Turn some insert_subreg, extract_subreg, subreg_to_reg into
 implicit_defs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78151 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LowerSubregs.cpp | 1 +
 1 file changed, 1 insertion(+)

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

diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp
index 2a12063..6c5052a 100644
--- a/lib/CodeGen/LowerSubregs.cpp
+++ b/lib/CodeGen/LowerSubregs.cpp
@@ -119,6 +119,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
          "Extract supperg source must be a physical register");
   assert(TargetRegisterInfo::isPhysicalRegister(DstReg) &&
          "Extract destination must be in a physical register");
+  assert(SrcReg && "invalid subregister index for register");
 
   DOUT << "subreg: CONVERTING: " << *MI;
 
-- 
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