From 55e3136679754796a686cf30f182f2bff2ad2d59 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Thu, 18 Aug 2016 02:21:54 +0000
Subject: [PATCH] Testcase for r279022

llvm-svn: 279031
---
 test/CodeGen/X86/taildup-crash.ll | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 test/CodeGen/X86/taildup-crash.ll

diff --git a/test/CodeGen/X86/taildup-crash.ll b/test/CodeGen/X86/taildup-crash.ll
new file mode 100644
index 00000000000..aeee114adb5
--- /dev/null
+++ b/test/CodeGen/X86/taildup-crash.ll
@@ -0,0 +1,24 @@
+; RUN: llc -o - %s | FileCheck %s
+target triple = "x86_64--"
+
+; Make sure we do not crash in tail duplication when finding no successor of a
+; block.
+; CHECK-LABEL: func:
+; CHECK: testb
+; CEHCK: je
+; CHECK: retq
+; CHECK: jmp
+define hidden void @func() {
+entry:
+  br i1 undef, label %for.cond.cleanup, label %while.cond.preheader
+
+while.cond.preheader:
+  br label %while.cond
+
+for.cond.cleanup:
+  ret void
+
+while.cond:
+  %cmp.i202 = icmp eq i8* undef, undef
+  br i1 %cmp.i202, label %while.cond.preheader, label %while.cond
+}