1 #ifdef __INT32_TYPE__
2 typedef __INT32_TYPE__ int32_t;
3 #else
4 typedef int int32_t;
5 #endif
6 
7 #ifdef __UINT32_TYPE__
8 typedef __UINT32_TYPE__ uint32_t;
9 #else
10 typedef 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
fake_bswap32(uint32_t in)24 fake_bswap32 (uint32_t in)
25 {
26   return __fake_const_swab32 (in);
27 }
28 
29 int
main(void)30 main(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