gcc/testsuite/gcc.c-torture/execute/pr63843.c

   1 /* PR rtl-optimization/63843 */
   2
   3 static inline __attribute__ ((always_inline))
   4 unsigned short foo (unsigned short v)
   5 {
   6   return (v << 8) | (v >> 8);
   7 }
   8
   9 unsigned short __attribute__ ((noinline, noclone, hot))
  10 bar (unsigned char *x)
  11 {
  12   unsigned int a;
  13   unsigned short b;
  14   __builtin_memcpy (&a, &x[0], sizeof (a));
  15   a ^= 0x80808080U;
  16   __builtin_memcpy (&x[0], &a, sizeof (a));
  17   __builtin_memcpy (&b, &x[2], sizeof (b));
  18   return foo (b);
  19 }
  20
  21 int
  22 main ()
  23 {
  24   unsigned char x[8] = { 0x01, 0x01, 0x01, 0x01 };
  25   if (__CHAR_BIT__ == 8
  26       && sizeof (short) == 2
  27       && sizeof (int) == 4
  28       && bar (x) != 0x8181U)
  29     __builtin_abort ();
  30   return 0;
  31 }