From 2a8dc35cca8016d74c7b00e1b6958d02148b305c Mon Sep 17 00:00:00 2001
From: Justin Holewinski <jholewinski@nvidia.com>
Date: Fri, 27 Jun 2014 18:35:56 +0000
Subject: [PATCH] [NVPTX] Emit .weak linkage for link_once, weak,
 available_externally, and common linkage

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211941 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/NVPTX/NVPTXAsmPrinter.cpp | 4 ++++
 test/CodeGen/NVPTX/weak-global.ll    | 9 +++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 test/CodeGen/NVPTX/weak-global.ll

diff --git a/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
index 652a4995569..a174949b994 100644
--- a/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -1367,6 +1367,10 @@ void NVPTXAsmPrinter::printModuleLevelGV(const GlobalVariable *GVar,
       O << ".visible ";
     else
       O << ".extern ";
+  } else if (GVar->hasLinkOnceLinkage() || GVar->hasWeakLinkage() ||
+             GVar->hasAvailableExternallyLinkage() ||
+             GVar->hasCommonLinkage()) {
+    O << ".weak ";
   }
 
   if (llvm::isTexture(*GVar)) {
diff --git a/test/CodeGen/NVPTX/weak-global.ll b/test/CodeGen/NVPTX/weak-global.ll
new file mode 100644
index 00000000000..2bef4c5228a
--- /dev/null
+++ b/test/CodeGen/NVPTX/weak-global.ll
@@ -0,0 +1,9 @@
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s
+
+; CHECK: .weak .global .align 4 .u32 g
+@g = common addrspace(1) global i32 zeroinitializer
+
+define i32 @func0() {
+  %val = load i32 addrspace(1)* @g
+  ret i32 %val
+}
-- 
2.11.0