New testcase for x86 XFmode problems.

From-SVN: r18051

gcc/testsuite/gcc.dg/980211-1.c

+/* Test long double on x86. */
+
+/* { dg-do run { target i?86-*-* } } */
+/* { dg-options -O2 } */
+
+__inline int
+__signbitl (long double __x)
+{
+  union { long double __l; int __i[3]; } __u = { __l: __x };
+
+  return (__u.__i[2] & 0x8000) != 0;
+}
+
+void
+foo (long double x, long double y)
+{
+  long double z = x / y;
+  if (__signbitl (x) && __signbitl (z))
+    abort ();
+}
+
+int main()
+{
+  if (sizeof (long double) > sizeof (double))
+    foo (-0.0, -1.0);
+  return 0;
+}