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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-02-01 15:03:07 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-04-06 15:52:11 -0700 |
| commit | 1527bc8b928dd1399c3d3467dd47d9ede210978a (patch) | |
| tree | fb391da915bdae9f933b8170ff61aa43c85ef9ae /arch/ia64 | |
| parent | 0fdf86754f70e813845af4abaa805165ce57a0bb (diff) | |
| download | kernel_samsung_smdk4412-1527bc8b928dd1399c3d3467dd47d9ede210978a.zip kernel_samsung_smdk4412-1527bc8b928dd1399c3d3467dd47d9ede210978a.tar.gz kernel_samsung_smdk4412-1527bc8b928dd1399c3d3467dd47d9ede210978a.tar.bz2 | |
bitops: Optimize hweight() by making use of compile-time evaluation
Rename the extisting runtime hweight() implementations to
__arch_hweight(), rename the compile-time versions to __const_hweight()
and then have hweight() pick between them.
Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100318111929.GB11152@aftab>
Acked-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <1265028224.24455.154.camel@laptop>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/include/asm/bitops.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h index 6ebc229..9da3df6 100644 --- a/arch/ia64/include/asm/bitops.h +++ b/arch/ia64/include/asm/bitops.h @@ -437,17 +437,18 @@ __fls (unsigned long x) * hweightN: returns the hamming weight (i.e. the number * of bits set) of a N-bit word */ -static __inline__ unsigned long -hweight64 (unsigned long x) +static __inline__ unsigned long __arch_hweight64(unsigned long x) { unsigned long result; result = ia64_popcnt(x); return result; } -#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful) -#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful) -#define hweight8(x) (unsigned int) hweight64((x) & 0xfful) +#define __arch_hweight32(x) ((unsigned int) __arch_hweight64((x) & 0xfffffffful)) +#define __arch_hweight16(x) ((unsigned int) __arch_hweight64((x) & 0xfffful)) +#define __arch_hweight8(x) ((unsigned int) __arch_hweight64((x) & 0xfful)) + +#include <asm-generic/bitops/const_hweight.h> #endif /* __KERNEL__ */ |