1#ifdef __INT32_TYPE__ 2typedef __INT32_TYPE__ int32_t; 3#else 4typedef int int32_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)(x) & (uint32_t)0x0000ff00UL) << 8) | \ 16 (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ 17 (( (int32_t)(x) & (int32_t)0xff000000UL) >> 24))) 18 19/* Previous version of bswap optimization failed to consider sign extension 20 and as a result would replace an expression *not* doing a bswap by a 21 bswap. */ 22 23__attribute__ ((noinline, noclone)) uint32_t 24fake_bswap32 (uint32_t in) 25{ 26 return __fake_const_swab32 (in); 27} 28 29int 30main(void) 31{ 32 if (sizeof (int32_t) * __CHAR_BIT__ != 32) 33 return 0; 34 if (sizeof (uint32_t) * __CHAR_BIT__ != 32) 35 return 0; 36 if (fake_bswap32 (0x87654321) != 0xffffff87) 37 __builtin_abort (); 38 return 0; 39} 40