Prevent tailcallelim from breaking "recursive" calls to builtins.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41804 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/TailCallElim/inf-recursion.ll b/test/Transforms/TailCallElim/inf-recursion.ll
new file mode 100644
index 0000000..d346171
--- /dev/null
+++ b/test/Transforms/TailCallElim/inf-recursion.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | opt -tailcallelim | grep call
+; Don't turn this into an infinite loop, this is probably the implementation
+; of fabs and we expect the codegen to lower fabs.
+
+define double @fabs(double %f) {
+entry:
+ %tmp2 = call double @fabs( double %f ) ; <double> [#uses=1]
+ ret double %tmp2
+}
+