--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/builtin-bswap-6a.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,43 @@
+/* { dg-do compile { target arm*-*-* alpha*-*-* i?86-*-* powerpc*-*-* rs6000-*-* x86_64-*-* s390*-*-* } } */
+/* { dg-require-effective-target stdint_types } */
+/* { dg-options "-O2 -fdump-rtl-combine" } */
+/* { dg-additional-options "-march=z900" { target s390*-*-* } } */
+
+/* The test is similiar to builtin-bswap-6.c but returns 1/2 instead
+   of 0/1 to prevent GCC from calculating the return value with
+   arithmetic instead of a comparison.  This requires the optimization
+   level to be bumped up to -O2 at least for x86_64.  */
+
+#include <stdint.h>
+
+#define BS(X) __builtin_bswap32(X)
+
+int foo1 (uint32_t a)
+{
+  if (BS (a) == 0xA0000)
+    return 1;
+  return 2;
+}
+
+int foo2 (uint32_t a)
+{
+  if (BS (a) != 0xA0000)
+    return 1;
+  return 2;
+}
+
+int foo3 (uint32_t a, uint32_t b)
+{
+  if (BS (a) == BS (b))
+    return 1;
+  return 2;
+}
+
+int foo4 (uint32_t a, uint32_t b)
+{
+  if (BS (a) != BS (b))
+    return 1;
+  return 2;
+}
+
+/* { dg-final { scan-rtl-dump-not "bswapsi" "combine" } } */