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| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2012-01-14 21:44:49 +0300 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2012-02-16 12:12:33 +0800 |
| commit | f2ea0f5f04c97b48c88edccba52b0682fbe45087 (patch) | |
| tree | 53ee15dd4d1a2122d0e571dc8263353acb54f333 /include/linux/bitops.h | |
| parent | crypto: sha512 - Avoid stack bloat on i386 (diff) | |
| download | wireguard-linux-f2ea0f5f04c97b48c88edccba52b0682fbe45087.tar.xz wireguard-linux-f2ea0f5f04c97b48c88edccba52b0682fbe45087.zip | |
crypto: sha512 - use standard ror64()
Use standard ror64() instead of hand-written.
There is no standard ror64, so create it.
The difference is shift value being "unsigned int" instead of uint64_t
(for which there is no reason). gcc starts to emit native ROR instructions
which it doesn't do for some reason currently. This should make the code
faster.
Patch survives in-tree crypto test and ping flood with hmac(sha512) on.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/bitops.h')
| -rw-r--r-- | include/linux/bitops.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h index a3ef66a2a083..fc8a3ffce320 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -50,6 +50,26 @@ static inline unsigned long hweight_long(unsigned long w) } /** + * rol64 - rotate a 64-bit value left + * @word: value to rotate + * @shift: bits to roll + */ +static inline __u64 rol64(__u64 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 __u64 ror64(__u64 word, unsigned int shift) +{ + return (word >> shift) | (word << (64 - shift)); +} + +/** * rol32 - rotate a 32-bit value left * @word: value to rotate * @shift: bits to roll |