gcc/testsuite/gcc.dg/pr89435.c

   1 /* PR rtl-optimization/89435 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O1 -fno-forward-propagate -fno-tree-forwprop -fno-tree-ccp" } */
   4
   5 unsigned short a;
   6 unsigned int b, c, d, e, f;
   7
   8 int
   9 main ()
  10 {
  11 #if __CHAR_BIT__ == 8 && __SIZEOF_INT__ == 4
  12   unsigned char g = e = __builtin_mul_overflow_p (5, 542624702, 0);
  13   d = __builtin_bswap64 (a);
  14   b = __builtin_sub_overflow ((unsigned char) -e, (unsigned int) d, &g);
  15   e = __builtin_mul_overflow (b, c, &a);
  16   f = g + e;
  17   if (f != 0xff)
  18     __builtin_abort ();
  19 #endif
  20   return 0;
  21 }