New testcase that is not actually handled yet, but should be in the future.

This is here to remind me to get back to this after a while.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10336 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/TailCallElim/tail_call_with_branch.ll b/test/Transforms/TailCallElim/tail_call_with_branch.ll
new file mode 100644 (file)
index 0000000..de606fc
--- /dev/null
+++ b/test/Transforms/TailCallElim/tail_call_with_branch.ll
@@ -0,0 +1,31 @@
+; This testcase is due to tail-duplication not wanting to copy the return
+; instruction into the terminating blocks because there was other code
+; optimized out of the function after the taildup happened.
+
+; RUN: llvm-as < %s | opt -tailcallelim | llvm-dis | not grep call
+
+int %t4(int %a) {
+entry:
+        %tmp.1 = and int %a, 1
+        %tmp.2 = cast int %tmp.1 to bool
+        br bool %tmp.2, label %then.0, label %else.0
+
+then.0:
+        %tmp.5 = add int %a, -1
+        %tmp.3 = call int %t4( int %tmp.5 )
+        br label %return
+
+else.0:
+        %tmp.7 = setne int %a, 0
+        br bool %tmp.7, label %then.1, label %return
+
+then.1:
+        %tmp.11 = add int %a, -2
+        %tmp.9 = call int %t4( int %tmp.11 )
+        br label %return
+
+return:
+        %result.0 = phi int [ 0, %else.0 ], [ %tmp.3, %then.0 ], [ %tmp.9, %then.1 ]
+        ret int %result.0
+}
+