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| author | Robert Richter <robert.richter@amd.com> | 2010-06-04 13:33:10 +0400 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2010-06-04 13:33:10 +0400 |
| commit | d8a382d2662822248a97ce9d670b90e68aefbd3a (patch) | |
| tree | 4f5bbd5d0a5881ed42de611402ea4ac2c6d6ff48 /include/linux/bitops.h | |
| parent | 45c34e05c4e3d36e7c44e790241ea11a1d90d54e (diff) | |
| parent | c6df8d5ab87a246942d138321e1721edbb69f6e1 (diff) | |
| download | linux-d8a382d2662822248a97ce9d670b90e68aefbd3a.tar.xz | |
Merge remote branch 'tip/perf/urgent' into oprofile/urgent
Diffstat (limited to 'include/linux/bitops.h')
| -rw-r--r-- | include/linux/bitops.h | 30 |
1 files changed, 5 insertions, 25 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h index b796eab5ca75..fc68053378ce 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -10,6 +10,11 @@ #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) #endif +extern unsigned int __sw_hweight8(unsigned int w); +extern unsigned int __sw_hweight16(unsigned int w); +extern unsigned int __sw_hweight32(unsigned int w); +extern unsigned long __sw_hweight64(__u64 w); + /* * Include this here because some architectures need generic_ffs/fls in * scope @@ -44,31 +49,6 @@ static inline unsigned long hweight_long(unsigned long w) return sizeof(w) == 4 ? hweight32(w) : hweight64(w); } -/* - * Clearly slow versions of the hweightN() functions, their benefit is - * of course compile time evaluation of constant arguments. - */ -#define HWEIGHT8(w) \ - ( BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + \ - (!!((w) & (1ULL << 0))) + \ - (!!((w) & (1ULL << 1))) + \ - (!!((w) & (1ULL << 2))) + \ - (!!((w) & (1ULL << 3))) + \ - (!!((w) & (1ULL << 4))) + \ - (!!((w) & (1ULL << 5))) + \ - (!!((w) & (1ULL << 6))) + \ - (!!((w) & (1ULL << 7))) ) - -#define HWEIGHT16(w) (HWEIGHT8(w) + HWEIGHT8((w) >> 8)) -#define HWEIGHT32(w) (HWEIGHT16(w) + HWEIGHT16((w) >> 16)) -#define HWEIGHT64(w) (HWEIGHT32(w) + HWEIGHT32((w) >> 32)) - -/* - * Type invariant version that simply casts things to the - * largest type. - */ -#define HWEIGHT(w) HWEIGHT64((u64)(w)) - /** * rol32 - rotate a 32-bit value left * @word: value to rotate |