From 82ccfed750f59d34d714556e26b2f81b5ffbc7c8 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 7 Jul 2010 21:52:21 +0000
Subject: [PATCH] Print undefined/unknown debug value as "undef".

llvm-svn: 107818
---
 lib/Target/X86/AsmPrinter/X86MCInstLower.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
index 44c8a513c65..717614ff0da 100644
--- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -505,7 +505,12 @@ void X86AsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
   O << V.getName();
   O << " <- ";
   // Frame address.  Currently handles register +- offset only.
-  O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 3, O);
+  O << '['; 
+  if (MI->getOperand(0).isReg() && MI->getOperand(0).getReg())
+    printOperand(MI, 0, O); 
+  else
+    O << "undef";
+  O << '+'; printOperand(MI, 3, O);
   O << ']';
   O << "+";
   printOperand(MI, NOps-2, O);