diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2009-12-22 14:32:06 +0300 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2010-03-09 08:30:47 +0300 |
| commit | 0f7b468b6eace87ecdc59b3ec8476d50b0561ac2 (patch) | |
| tree | 0353e8ba78a5d05d32f916f1664b9e46d1f1dc46 /arch/blackfin/include | |
| parent | 252077cf7d44f1f261a5fdaedab88057f8379859 (diff) | |
| download | linux-0f7b468b6eace87ecdc59b3ec8476d50b0561ac2.tar.xz | |
Blackfin: add optimized version of Hamming Weight functions
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/include')
| -rw-r--r-- | arch/blackfin/include/asm/bitops.h | 74 |
1 files changed, 55 insertions, 19 deletions
diff --git a/arch/blackfin/include/asm/bitops.h b/arch/blackfin/include/asm/bitops.h index a2ff3fb3568d..605ba8e9b2e4 100644 --- a/arch/blackfin/include/asm/bitops.h +++ b/arch/blackfin/include/asm/bitops.h @@ -7,22 +7,41 @@ #ifndef _BLACKFIN_BITOPS_H #define _BLACKFIN_BITOPS_H -#ifndef CONFIG_SMP -# include <asm-generic/bitops.h> -#else +#include <linux/compiler.h> + +#include <asm-generic/bitops/__ffs.h> +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/find.h> #ifndef _LINUX_BITOPS_H #error only <linux/bitops.h> can be included directly #endif -#include <linux/compiler.h> -#include <asm/byteorder.h> /* swab32 */ - -#include <asm-generic/bitops/ffs.h> -#include <asm-generic/bitops/__ffs.h> #include <asm-generic/bitops/sched.h> -#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/ffs.h> +#include <asm-generic/bitops/lock.h> +#include <asm-generic/bitops/ext2-non-atomic.h> +#include <asm-generic/bitops/ext2-atomic.h> +#include <asm-generic/bitops/minix.h> + +#ifndef CONFIG_SMP +#include <linux/irqflags.h> + +/* + * clear_bit may not imply a memory barrier + */ +#ifndef smp_mb__before_clear_bit +#define smp_mb__before_clear_bit() smp_mb() +#define smp_mb__after_clear_bit() smp_mb() +#endif +#include <asm-generic/bitops/atomic.h> +#include <asm-generic/bitops/non-atomic.h> +#else +#include <asm/byteorder.h> /* swab32 */ #include <linux/linkage.h> asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr); @@ -89,19 +108,36 @@ static inline int test_and_change_bit(int nr, volatile unsigned long *addr) #include <asm-generic/bitops/non-atomic.h> -#include <asm-generic/bitops/find.h> -#include <asm-generic/bitops/hweight.h> -#include <asm-generic/bitops/lock.h> +#endif /* CONFIG_SMP */ -#include <asm-generic/bitops/ext2-atomic.h> -#include <asm-generic/bitops/ext2-non-atomic.h> +/* + * hweightN: returns the hamming weight (i.e. the number + * of bits set) of a N-bit word + */ -#include <asm-generic/bitops/minix.h> +static inline unsigned int hweight32(unsigned int w) +{ + unsigned int res; -#include <asm-generic/bitops/fls.h> -#include <asm-generic/bitops/__fls.h> -#include <asm-generic/bitops/fls64.h> + __asm__ ("%0.l = ONES %0;" + "%0 = %0.l (Z);" + : "=d" (res) : "d" (w)); + return res; +} -#endif /* CONFIG_SMP */ +static inline unsigned int hweight64(__u64 w) +{ + return hweight32((unsigned int)(w >> 32)) + hweight32((unsigned int)w); +} + +static inline unsigned int hweight16(unsigned int w) +{ + return hweight32(w & 0xffff); +} + +static inline unsigned int hweight8(unsigned int w) +{ + return hweight32(w & 0xff); +} #endif /* _BLACKFIN_BITOPS_H */ |