1#ifdef __INT16_TYPE__
2typedef __INT16_TYPE__ int16_t;
3#else
4typedef short int16_t;
5#endif
6
7#ifdef __UINT32_TYPE__
8typedef __UINT32_TYPE__ uint32_t;
9#else
10typedef unsigned uint32_t;
11#endif
12
13#define __fake_const_swab32(x) ((uint32_t)(			      \
14	(((uint32_t)         (x) & (uint32_t)0x000000ffUL) << 24) |   \
15	(((uint32_t)(int16_t)(x) & (uint32_t)0x00ffff00UL) <<  8) |   \
16	(((uint32_t)         (x) & (uint32_t)0x00ff0000UL) >>  8) |   \
17	(((uint32_t)         (x) & (uint32_t)0xff000000UL) >> 24)))
18
19
20/* Previous version of bswap optimization failed to consider sign extension
21   and as a result would replace an expression *not* doing a bswap by a
22   bswap.  */
23
24__attribute__ ((noinline, noclone)) uint32_t
25fake_bswap32 (uint32_t in)
26{
27  return __fake_const_swab32 (in);
28}
29
30int
31main(void)
32{
33  if (sizeof (uint32_t) * __CHAR_BIT__ != 32)
34    return 0;
35  if (sizeof (int16_t) * __CHAR_BIT__ != 16)
36    return 0;
37  if (fake_bswap32 (0x81828384) != 0xff838281)
38    __builtin_abort ();
39  return 0;
40}
41