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

   1 /* PR rtl-optimization/65401 */
   2 /* { dg-skip-if "requires default endianness" { *-*-* } "-fsso-struct=*" "" } */
   3
   4 struct S { unsigned short s[64]; };
   5
   6 __attribute__((noinline, noclone)) void
   7 foo (struct S *x)
   8 {
   9   unsigned int i;
  10   unsigned char *s;
  11
  12   s = (unsigned char *) x->s;
  13   for (i = 0; i < 64; i++)
  14     x->s[i] = s[i * 2] | (s[i * 2 + 1] << 8);
  15 }
  16
  17 __attribute__((noinline, noclone)) void
  18 bar (struct S *x)
  19 {
  20   unsigned int i;
  21   unsigned char *s;
  22
  23   s = (unsigned char *) x->s;
  24   for (i = 0; i < 64; i++)
  25     x->s[i] = (s[i * 2] << 8) | s[i * 2 + 1];
  26 }
  27
  28 int
  29 main ()
  30 {
  31   unsigned int i;
  32   struct S s;
  33   if (sizeof (unsigned short) != 2)
  34     return 0;
  35   for (i = 0; i < 64; i++)
  36     s.s[i] = i + ((64 - i) << 8);
  37   foo (&s);
  38 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  39   for (i = 0; i < 64; i++)
  40     if (s.s[i] != (64 - i) + (i << 8))
  41       __builtin_abort ();
  42 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  43   for (i = 0; i < 64; i++)
  44     if (s.s[i] != i + ((64 - i) << 8))
  45       __builtin_abort ();
  46 #endif
  47   for (i = 0; i < 64; i++)
  48     s.s[i] = i + ((64 - i) << 8);
  49   bar (&s);
  50 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  51   for (i = 0; i < 64; i++)
  52     if (s.s[i] != (64 - i) + (i << 8))
  53       __builtin_abort ();
  54 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  55   for (i = 0; i < 64; i++)
  56     if (s.s[i] != i + ((64 - i) << 8))
  57       __builtin_abort ();
  58 #endif
  59   return 0;
  60 }