From 78ff647e4471c88c3a3826e7ac24adcd8a9a2073 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 19 May 2011 22:05:56 +0000
Subject: [PATCH] Looks like OS X assemblers (including MC) don't like

foo:
bar = foo
.quad bar

Avoid producing it. Fixes PR9951.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131687 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCStreamer.cpp    |  3 ++-
 test/DebugInfo/pr9951.ll | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 test/DebugInfo/pr9951.ll

diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index 8aaad5ee0d1..4e4cb8c4ce4 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -43,7 +43,8 @@ const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
 }
 
 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
-  if (Context.getAsmInfo().hasAggressiveSymbolFolding())
+  if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
+      isa<MCSymbolRefExpr>(Expr))
     return Expr;
 
   MCSymbol *ABS = Context.CreateTempSymbol();
diff --git a/test/DebugInfo/pr9951.ll b/test/DebugInfo/pr9951.ll
new file mode 100644
index 00000000000..7716cd7c6c1
--- /dev/null
+++ b/test/DebugInfo/pr9951.ll
@@ -0,0 +1,23 @@
+; RUN: llc -mtriple x86_64-apple-darwin10.0.0 -disable-cfi %s -o - | FileCheck %s
+
+define i32 @f() nounwind {
+entry:
+  ret i32 42
+}
+
+!llvm.dbg.sp = !{!0}
+
+!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"f", metadata !"f", metadata !"", metadata !1, i32 1, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 false, i32 ()* @f, null, null} ; [ DW_TAG_subprogram ]
+!1 = metadata !{i32 589865, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build-rust2", metadata !2} ; [ DW_TAG_file_type ]
+!2 = metadata !{i32 589841, i32 0, i32 12, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build-rust2", metadata !"clang version 3.0 ()", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
+!3 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 589860, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+
+
+; CHECK:      _f:                                     ## @f
+; CHECK-NEXT: Ltmp0:
+
+; CHECK:      Ltmp9 = (Ltmp3-Ltmp2)-0
+; CHECK-NEXT:	.long	Ltmp9
+; CHECK-NEXT:	.quad	Ltmp0