Reenable tail duplication of bb with just an unconditional jump, but
don't remove blocks that have their address taken.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133659 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/tail-dup-addr.ll b/test/CodeGen/X86/tail-dup-addr.ll
new file mode 100644
index 0000000..c5a105c
--- /dev/null
+++ b/test/CodeGen/X86/tail-dup-addr.ll
@@ -0,0 +1,28 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
+
+; Test that we don't drop a block that has its address taken.
+
+; CHECK: Ltmp1: ## Block address taken
+; CHECK: Ltmp2: ## Block address taken
+
+@a = common global i32 0, align 4
+@p = common global i8* null, align 8
+
+define void @foo() noreturn nounwind uwtable ssp {
+entry:
+ %tmp = load i32* @a, align 4
+ %foo = icmp eq i32 0, %tmp
+ br i1 %foo, label %sw.bb, label %sw.default
+
+sw.bb: ; preds = %entry
+ store i8* blockaddress(@foo, %sw.bb1), i8** @p, align 8
+ br label %sw.bb1
+
+sw.bb1: ; preds = %sw.default, %sw.bb, %entry
+ store i8* blockaddress(@foo, %sw.default), i8** @p, align 8
+ br label %sw.default
+
+sw.default: ; preds = %sw.bb1, %entry
+ store i8* blockaddress(@foo, %sw.bb1), i8** @p, align 8
+ br label %sw.bb1
+}