From: Dale Johannesen <dalej@apple.com>
Date: Wed, 27 Jan 2010 22:11:16 +0000 (+0000)
Subject: Treat MO_REG 0 location as undefined in DEBUG_VALUE,
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=714eb731b2df6b4eb5221e76297d4c691ab91b3e;p=oota-llvm.git

Treat MO_REG 0 location as undefined in DEBUG_VALUE,
per document.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94693 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
index b6a358133bb..9fb6ca4c460 100644
--- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -428,10 +428,16 @@ void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
     O << V.getName();
     O << " <- ";
     if (NOps==3) {
-      // Register or immediate value
+      // Register or immediate value. Register 0 means undef.
       assert(MI->getOperand(0).getType()==MachineOperand::MO_Register ||
              MI->getOperand(0).getType()==MachineOperand::MO_Immediate);
-      printOperand(MI, 0);
+      if (MI->getOperand(0).getType()==MachineOperand::MO_Register &&
+          MI->getOperand(0).getReg()==0) {
+        // Suppress offset in this case, it is not meaningful.
+        O << "undef";
+        return;
+      } else
+        printOperand(MI, 0);
     } else {
       // Frame address.  Currently handles register +- offset only.
       assert(MI->getOperand(0).getType()==MachineOperand::MO_Register);