Test case for PR middle-end/13779.

From-SVN: r76652

gcc/testsuite/gcc.dg/darwin-longlong.c

+/* { dg-do run { target powerpc*-*-* } } */
+/* { dg-options "-mcpu=G5" } */
+
+#include <signal.h>
+
+void
+sig_ill_handler (int sig)
+{
+    exit(0);
+}
+
+
+int  msw(long long in)
+{
+  union {
+    long long ll;
+    int  i[2];
+  } ud;
+  ud.ll = in;
+  return ud.i[0];
+}
+
+int main()
+{
+
+  /* Exit on systems without 64bit instructions.  */
+  signal (SIGILL, sig_ill_handler);
+  asm volatile ("extsw r0,r0");
+  signal (SIGILL, SIG_DFL);
+
+  if (msw(1) != 0)
+    abort();
+  exit(0);
+}