If a constant or a function has linkonce_odr linkage and unnamed_addr, mark it

hidden. Being linkonce_odr guarantees that it is available in every dso that
needs it. Being a constant/function with unnamed_addr guarantees that the
copies don't have to be merged.

llvm-svn: 159136

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/test/Transforms/GlobalOpt/hidden.ll b/llvm/test/Transforms/GlobalOpt/hidden.ll
new file mode 100644
index 00000000000..301e158d534
--- /dev/null
+++ b/llvm/test/Transforms/GlobalOpt/hidden.ll
@@ -0,0 +1,14 @@
+; RUN: opt %s -globalopt -S | FileCheck %s
+
+@foo = linkonce_odr unnamed_addr constant i32 42
+; CHECK: @foo = linkonce_odr hidden unnamed_addr constant i32 42
+
+define linkonce_odr void @bar() unnamed_addr {
+; CHECK: define linkonce_odr hidden void @bar() unnamed_addr {
+  ret void
+}
+
+define i32* @zed() {
+  call void @bar()
+  ret i32* @foo
+}