gcc/testsuite/gcc.c-torture/execute/pr65401.c

   1 /* PR rtl-optimization/65401 */
   2
   3 struct S { unsigned short s[64]; };
   4
   5 __attribute__((noinline, noclone)) void
   6 foo (struct S *x)
   7 {
   8   unsigned int i;
   9   unsigned char *s;
  10
  11   s = (unsigned char *) x->s;
  12   for (i = 0; i < 64; i++)
  13     x->s[i] = s[i * 2] | (s[i * 2 + 1] << 8);
  14 }
  15
  16 __attribute__((noinline, noclone)) void
  17 bar (struct S *x)
  18 {
  19   unsigned int i;
  20   unsigned char *s;
  21
  22   s = (unsigned char *) x->s;
  23   for (i = 0; i < 64; i++)
  24     x->s[i] = (s[i * 2] << 8) | s[i * 2 + 1];
  25 }
  26
  27 int
  28 main ()
  29 {
  30   unsigned int i;
  31   struct S s;
  32   if (sizeof (unsigned short) != 2)
  33     return 0;
  34   for (i = 0; i < 64; i++)
  35     s.s[i] = i + ((64 - i) << 8);
  36   foo (&s);
  37 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  38   for (i = 0; i < 64; i++)
  39     if (s.s[i] != (64 - i) + (i << 8))
  40       __builtin_abort ();
  41 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  42   for (i = 0; i < 64; i++)
  43     if (s.s[i] != i + ((64 - i) << 8))
  44       __builtin_abort ();
  45 #endif
  46   for (i = 0; i < 64; i++)
  47     s.s[i] = i + ((64 - i) << 8);
  48   bar (&s);
  49 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  50   for (i = 0; i < 64; i++)
  51     if (s.s[i] != (64 - i) + (i << 8))
  52       __builtin_abort ();
  53 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  54   for (i = 0; i < 64; i++)
  55     if (s.s[i] != i + ((64 - i) << 8))
  56       __builtin_abort ();
  57 #endif
  58   return 0;
  59 }