1 #ifndef _LINUX_BITREV_H
2 #define _LINUX_BITREV_H
4 #include <linux/types.h>
6 #ifdef CONFIG_HAVE_ARCH_BITREVERSE
7 #include <asm/bitrev.h>
9 #define __bitrev32 __arch_bitrev32
10 #define __bitrev16 __arch_bitrev16
11 #define __bitrev8 __arch_bitrev8
14 extern u8
const byte_rev_table
[256];
15 static inline u8
__bitrev8(u8 byte
)
17 return byte_rev_table
[byte
];
20 static inline u16
__bitrev16(u16 x
)
22 return (__bitrev8(x
& 0xff) << 8) | __bitrev8(x
>> 8);
25 static inline u32
__bitrev32(u32 x
)
27 return (__bitrev16(x
& 0xffff) << 16) | __bitrev16(x
>> 16);
30 #endif /* CONFIG_HAVE_ARCH_BITREVERSE */
32 #define __constant_bitrev32(x) \
35 __x = (__x >> 16) | (__x << 16); \
36 __x = ((__x & (u32)0xFF00FF00UL) >> 8) | ((__x & (u32)0x00FF00FFUL) << 8); \
37 __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \
38 __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \
39 __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \
43 #define __constant_bitrev16(x) \
46 __x = (__x >> 8) | (__x << 8); \
47 __x = ((__x & (u16)0xF0F0U) >> 4) | ((__x & (u16)0x0F0FU) << 4); \
48 __x = ((__x & (u16)0xCCCCU) >> 2) | ((__x & (u16)0x3333U) << 2); \
49 __x = ((__x & (u16)0xAAAAU) >> 1) | ((__x & (u16)0x5555U) << 1); \
53 #define __constant_bitrev8(x) \
56 __x = (__x >> 4) | (__x << 4); \
57 __x = ((__x & (u8)0xCCU) >> 2) | ((__x & (u8)0x33U) << 2); \
58 __x = ((__x & (u8)0xAAU) >> 1) | ((__x & (u8)0x55U) << 1); \
65 __builtin_constant_p(__x) ? \
66 __constant_bitrev32(__x) : \
73 __builtin_constant_p(__x) ? \
74 __constant_bitrev16(__x) : \
81 __builtin_constant_p(__x) ? \
82 __constant_bitrev8(__x) : \
85 #endif /* _LINUX_BITREV_H */
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