gcc/testsuite/gcc.dg/pr94873.c

   1 /* PR rtl-optimization/94873 */
   2 /* { dg-do run { target int128 } } */
   3 /* { dg-options "-O -fno-merge-constants -fno-split-wide-types -fno-tree-fre" } */
   4
   5 __attribute__((noipa)) void
   6 foo (const char *p, int q)
   7 {
   8   if (p[0] != '%' || p[1] != '0' || p[2] != '2' || p[3] != 'x' || p[4] != '\0')
   9     __builtin_abort ();
  10 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  11   if ((unsigned char) q != 0x95)
  12     __builtin_abort ();
  13 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  14   if ((unsigned char) q != 0)
  15     __builtin_abort ();
  16 #endif
  17 }
  18
  19 int
  20 main ()
  21 {
  22   union U { __int128 a; char b[sizeof (__int128)]; };
  23   char x = ((union U){ .a = 0xF4409395252B9560ULL}).b[1];
  24   for (unsigned i = 0; i < sizeof (x); i++)
  25     foo ("%02x", i[(volatile unsigned char *) &x]);
  26   return 0;
  27 }