gcc/testsuite/gcc.dg/builtin-bswap-11.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target int128 } */
   3 /* { dg-require-effective-target stdint_types } */
   4 /* { dg-options "-Wall" } */
   5
   6 #include <stdint.h>
   7
   8 #define MAKE_FUN(suffix, type)                                          \
   9   type my_bswap##suffix(type x) {                                       \
  10     type result = 0;                                                    \
  11     int shift;                                                          \
  12     for (shift = 0; shift < 8 * sizeof (type); shift += 8)      \
  13       {                                                                 \
  14         result <<= 8;                                                   \
  15         result |= (x >> shift) & 0xff;                                  \
  16       }                                                                 \
  17     return result;                                                      \
  18   }                                                                     \
  19
  20 MAKE_FUN(128, __uint128_t);
  21
  22 extern void abort (void);
  23
  24 typedef union
  25 {
  26   struct { uint64_t lo; uint64_t hi; } s;
  27   __uint128_t n;
  28 } u;
  29
  30 #define NUMS128                                                 \
  31   {                                                             \
  32     { .s = { 0x0000000000000000ULL, 0x1122334455667788ULL } },  \
  33     { .s = { 0x1122334455667788ULL, 0xffffffffffffffffULL } },  \
  34     { .s = { 0xffffffffffffffffULL, 0x0000000000000000ULL } }   \
  35   }
  36
  37 u uint128_ts[] = NUMS128;
  38
  39 #define N(table) (sizeof (table) / sizeof (table[0]))
  40
  41 int
  42 main (void)
  43 {
  44   int i;
  45
  46   for (i = 0; i < N(uint128_ts); i++)
  47     if (__builtin_bswap128 (uint128_ts[i].n) != my_bswap128 (uint128_ts[i].n))
  48       abort ();
  49
  50   return 0;
  51 }