From 6ef66144f3e9512d11caeb46425c12a1e0d817f8 Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Thu, 13 Nov 2014 20:07:40 +0000
Subject: [PATCH] R600: Fix assert on empty function

If a function is just an unreachable, this would hit a
"this is not a MachO target" assertion because of setting
HasSubsectionViaSymbols.

llvm-svn: 221920
---
 .../lib/Target/R600/MCTargetDesc/AMDGPUMCAsmInfo.cpp |  1 -
 llvm/test/CodeGen/R600/empty-function.ll             | 20 ++++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 llvm/test/CodeGen/R600/empty-function.ll

diff --git a/llvm/lib/Target/R600/MCTargetDesc/AMDGPUMCAsmInfo.cpp b/llvm/lib/Target/R600/MCTargetDesc/AMDGPUMCAsmInfo.cpp
index 5393504..3c2b889 100644
--- a/llvm/lib/Target/R600/MCTargetDesc/AMDGPUMCAsmInfo.cpp
+++ b/llvm/lib/Target/R600/MCTargetDesc/AMDGPUMCAsmInfo.cpp
@@ -14,7 +14,6 @@ using namespace llvm;
 AMDGPUMCAsmInfo::AMDGPUMCAsmInfo(StringRef &TT) : MCAsmInfoELF() {
   HasSingleParameterDotFile = false;
   //===------------------------------------------------------------------===//
-  HasSubsectionsViaSymbols = true;
   MaxInstLength = 16;
   SeparatorString = "\n";
   CommentString = ";";
diff --git a/llvm/test/CodeGen/R600/empty-function.ll b/llvm/test/CodeGen/R600/empty-function.ll
new file mode 100644
index 0000000..d4ff803
--- /dev/null
+++ b/llvm/test/CodeGen/R600/empty-function.ll
@@ -0,0 +1,20 @@
+; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
+
+; Make sure we don't assert on empty functions
+
+; SI-LABEL: {{^}}empty_function_ret:
+; SI: .text
+; SI: s_endpgm
+; SI: codeLenInByte = 4
+define void @empty_function_ret() #0 {
+  ret void
+}
+
+; SI-LABEL: {{^}}empty_function_unreachable:
+; SI: .text
+; SI: codeLenInByte = 0
+define void @empty_function_unreachable() #0 {
+  unreachable
+}
+
+attributes #0 = { nounwind }
-- 
2.7.4