Release 4.12 include/linux/bitrev.h

#ifndef _LINUX_BITREV_H

#define _LINUX_BITREV_H

#include <linux/types.h>

#ifdef CONFIG_HAVE_ARCH_BITREVERSE
#include <asm/bitrev.h>


#define __bitrev32 __arch_bitrev32

#define __bitrev16 __arch_bitrev16

#define __bitrev8 __arch_bitrev8

#else
extern u8 const byte_rev_table[256];


static inline u8 __bitrev8(u8 byte)
{
	return byte_rev_table[byte];
}

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static inline u16 __bitrev16(u16 x)
{
	return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8);
}

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static inline u32 __bitrev32(u32 x)
{
	return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16);
}

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#endif /* CONFIG_HAVE_ARCH_BITREVERSE */


#define __constant_bitrev32(x)	\
({                                      \
        u32 __x = x;                    \
        __x = (__x >> 16) | (__x << 16);        \
        __x = ((__x & (u32)0xFF00FF00UL) >> 8) | ((__x & (u32)0x00FF00FFUL) << 8);      \
        __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4);      \
        __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2);      \
        __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1);      \
        __x;                                                            \
})


#define __constant_bitrev16(x)	\
({                                      \
        u16 __x = x;                    \
        __x = (__x >> 8) | (__x << 8);  \
        __x = ((__x & (u16)0xF0F0U) >> 4) | ((__x & (u16)0x0F0FU) << 4);        \
        __x = ((__x & (u16)0xCCCCU) >> 2) | ((__x & (u16)0x3333U) << 2);        \
        __x = ((__x & (u16)0xAAAAU) >> 1) | ((__x & (u16)0x5555U) << 1);        \
        __x;                                                            \
})


#define __constant_bitrev8(x)	\
({                                      \
        u8 __x = x;                     \
        __x = (__x >> 4) | (__x << 4);  \
        __x = ((__x & (u8)0xCCU) >> 2) | ((__x & (u8)0x33U) << 2);      \
        __x = ((__x & (u8)0xAAU) >> 1) | ((__x & (u8)0x55U) << 1);      \
        __x;                                                            \
})


#define bitrev32(x) \
({                      \
        u32 __x = x;    \
        __builtin_constant_p(__x) ?     \
        __constant_bitrev32(__x) :                      \
        __bitrev32(__x);                                \
})


#define bitrev16(x) \
({                      \
        u16 __x = x;    \
        __builtin_constant_p(__x) ?     \
        __constant_bitrev16(__x) :                      \
        __bitrev16(__x);                                \
 })


#define bitrev8(x) \
({                      \
        u8 __x = x;     \
        __builtin_constant_p(__x) ?     \
        __constant_bitrev8(__x) :                       \
        __bitrev8(__x)  ;                       \
 })
#endif /* _LINUX_BITREV_H */
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Directory: include/linux

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