Commit 6aa25b4a authored by Stefan Weil's avatar Stefan Weil
Browse files

bitops: Add rotate functions (rol8, ror8, ...) 



These functions were copies from include/linux/bitopts.h.

Signed-off-by: default avatarStefan Weil <sw@weilnetz.de>
Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
parent d285bf78

include/qemu/bitops.h

+80 −0
Original line number Diff line number Diff line
@@ -183,6 +183,86 @@ static inline unsigned long hweight_long(unsigned long w) 
    return count;

}



/**

 * rol8 - rotate an 8-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint8_t rol8(uint8_t word, unsigned int shift)

{

    return (word << shift) | (word >> (8 - shift));

}



/**

 * ror8 - rotate an 8-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint8_t ror8(uint8_t word, unsigned int shift)

{

    return (word >> shift) | (word << (8 - shift));

}



/**

 * rol16 - rotate a 16-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint16_t rol16(uint16_t word, unsigned int shift)

{

    return (word << shift) | (word >> (16 - shift));

}



/**

 * ror16 - rotate a 16-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint16_t ror16(uint16_t word, unsigned int shift)

{

    return (word >> shift) | (word << (16 - shift));

}



/**

 * rol32 - rotate a 32-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint32_t rol32(uint32_t word, unsigned int shift)

{

    return (word << shift) | (word >> (32 - shift));

}



/**

 * ror32 - rotate a 32-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint32_t ror32(uint32_t word, unsigned int shift)

{

    return (word >> shift) | (word << (32 - shift));

}



/**

 * rol64 - rotate a 64-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint64_t rol64(uint64_t word, unsigned int shift)

{

    return (word << shift) | (word >> (64 - shift));

}



/**

 * ror64 - rotate a 64-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline uint64_t ror64(uint64_t word, unsigned int shift)

{

    return (word >> shift) | (word << (64 - shift));

}



/**

 * extract32:

 * @value: the value to extract the bit field from