--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/pr57371-2.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-optimized" } */
+
+/* We can not get rid of comparison in tests below because of
+   potential inexact exception.
+
+   TODO: enable when -fno-trapping-math.  */
+
+int foo1(int x) {
+  return (float) x != 0;
+  /* { dg-final { scan-tree-dump "\\(float\\)" "optimized" } } */
+}
+
+int foo2(long long x) {
+  /* { dg-final { scan-tree-dump "\\(double\\)" "optimized" } } */
+  return (double) x != 0;
+}