Inliner: Non-local functions in COMDATs shouldn't be dropped

A function with discardable linkage cannot be discarded if its a member
of a COMDAT group without considering all the other COMDAT members as
well.  This sort of thing is already handled by GlobalOpt/GlobalDCE.

This fixes PR21206.

llvm-svn: 219335

1 files changed, 18 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/pr21206.ll b/llvm/test/Transforms/Inline/pr21206.ll
new file mode 100644
index 00000000000..1a4366ecdb8
--- /dev/null
+++ b/llvm/test/Transforms/Inline/pr21206.ll
@@ -0,0 +1,18 @@
+; RUN: opt < %s -inline -S | FileCheck %s
+
+$c = comdat any
+; CHECK: $c = comdat any
+
+define linkonce_odr void @foo() comdat $c {
+  ret void
+}
+; CHECK: define linkonce_odr void @foo() comdat $c
+
+define linkonce_odr void @bar() comdat $c {
+  ret void
+}
+; CHECK: define linkonce_odr void @bar() comdat $c
+
+define void()* @zed()  {
+  ret void()* @foo
+}