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 b6a3581..9fb6ca4 100644
--- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -428,10 +428,16 @@
     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);