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linux-stable-rt/include/asm-generic/bitops/arch_hweight.h

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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>
2010-02-01 22:03:07 +08:00
#ifndef _ASM_GENERIC_BITOPS_ARCH_HWEIGHT_H_
#define _ASM_GENERIC_BITOPS_ARCH_HWEIGHT_H_
#include <asm/types.h>
extern unsigned int __arch_hweight32(unsigned int w);
extern unsigned int __arch_hweight16(unsigned int w);
extern unsigned int __arch_hweight8(unsigned int w);
extern unsigned long __arch_hweight64(__u64 w);
#endif /* _ASM_GENERIC_BITOPS_HWEIGHT_H_ */