Add file omitted from last checkin.

From-SVN: r135525

gcc/testsuite/gcc.dg/torture/builtin-isinf_sign-1.c

+/* Copyright (C) 2008  Free Software Foundation.
+
+   Verify that __builtin_isinf_sign folds correctly.
+
+   Origin: Kaveh R. Ghazi,  May 17, 2008.  */
+
+/* { dg-do link } */
+
+/* All references to link_error should go away at compile-time.  */
+extern void link_error(int);
+
+void __attribute__ ((__noinline__))
+foo (float f, double d, long double ld)
+{
+  /* Test the generic expansion of isinf_sign.  */
+
+  if (__builtin_isinf_sign(f)
+      != (__builtin_isinf(f) ? (__builtin_signbitf(f) ? -1 : 1) : 0))
+    link_error (__LINE__);
+  if (__builtin_isinf_sign(d)
+      != (__builtin_isinf(d) ? (__builtin_signbit(d) ? -1 : 1) : 0))
+    link_error (__LINE__);
+  if (__builtin_isinf_sign(ld)
+      != (__builtin_isinf(ld) ? (__builtin_signbitl(ld) ? -1 : 1) : 0))
+    link_error (__LINE__);
+
+  /* In boolean contexts, GCC will fold the inner conditional
+     expression to 1.  So isinf_sign folds to plain isinf.  */
+
+  if ((_Bool)__builtin_isinf_sign(f) != (__builtin_isinf(f) != 0))
+    link_error (__LINE__);
+  if ((_Bool)__builtin_isinf_sign(d) != (__builtin_isinf(d) != 0))
+    link_error (__LINE__);
+  if ((_Bool)__builtin_isinf_sign(ld) != (__builtin_isinf(ld) != 0))
+    link_error (__LINE__);
+
+  if ((__builtin_isinf_sign(f) != 0) != (__builtin_isinf(f) != 0))
+    link_error (__LINE__);
+  if ((__builtin_isinf_sign(d) != 0) != (__builtin_isinf(d) != 0))
+    link_error (__LINE__);
+  if ((__builtin_isinf_sign(ld) != 0) != (__builtin_isinf(ld) != 0))
+    link_error (__LINE__);
+
+  if ((__builtin_isinf_sign(f) ? 5 : 6) != (__builtin_isinf(f) ? 5 : 6))
+    link_error (__LINE__);
+  if ((__builtin_isinf_sign(d) ? 5 : 6) != (__builtin_isinf(d) ? 5 : 6))
+    link_error (__LINE__);
+  if ((__builtin_isinf_sign(ld) ? 5 : 6) != (__builtin_isinf(ld) ? 5 : 6))
+    link_error (__LINE__);
+}
+
+int main (void)
+{
+  foo (1, 2, 3);
+  return 0;
+}