From a62d11ea942ab99ba74589f74d390138654b6197 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 8 Dec 2011 21:34:20 +0000
Subject: [PATCH] ARM asm parser, just issue a warning for a duplicate reg in a
 list.

For better 'gas' compatibility.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146185 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/AsmParser/ARMAsmParser.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 9b50f582fb0..16878b25548 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -2596,6 +2596,7 @@ parseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
     Parser.Lex(); // Eat the comma.
     RegLoc = Parser.getTok().getLoc();
     int OldReg = Reg;
+    const AsmToken RegTok = Parser.getTok();
     Reg = tryParseRegister();
     if (Reg == -1)
       return Error(RegLoc, "register expected");
@@ -2609,8 +2610,13 @@ parseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
     if (!RC->contains(Reg))
       return Error(RegLoc, "invalid register in register list");
     // List must be monotonically increasing.
-    if (getARMRegisterNumbering(Reg) <= getARMRegisterNumbering(OldReg))
+    if (getARMRegisterNumbering(Reg) < getARMRegisterNumbering(OldReg))
       return Error(RegLoc, "register list not in ascending order");
+    if (getARMRegisterNumbering(Reg) == getARMRegisterNumbering(OldReg)) {
+      Warning(RegLoc, "duplicated register (" + RegTok.getString() +
+              ") in register list");
+      continue;
+    }
     // VFP register lists must also be contiguous.
     // It's OK to use the enumeration values directly here rather, as the
     // VFP register classes have the enum sorted properly.