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bitops: Optimize hweight() by making use of compile-time evaluation

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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>
This commit is contained in:
Peter Zijlstra
2010-02-01 15:03:07 +01:00
committed by H. Peter Anvin
parent 0fdf86754f
commit 1527bc8b92
8 changed files with 87 additions and 58 deletions
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11
arch/sparc/include/asm/bitops_64.h
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@@ -44,7 +44,7 @@ extern void change_bit(unsigned long nr, volatile unsigned long *addr);
#ifdef ULTRA_HAS_POPULATION_COUNT
static inline unsigned int hweight64(unsigned long w)
static inline unsigned int __arch_hweight64(unsigned long w)
{
unsigned int res;
@@ -52,7 +52,7 @@ static inline unsigned int hweight64(unsigned long w)
return res;
}
static inline unsigned int hweight32(unsigned int w)
static inline unsigned int __arch_hweight32(unsigned int w)
{
unsigned int res;
@@ -60,7 +60,7 @@ static inline unsigned int hweight32(unsigned int w)
return res;
}
static inline unsigned int hweight16(unsigned int w)
static inline unsigned int __arch_hweight16(unsigned int w)
{
unsigned int res;
@@ -68,7 +68,7 @@ static inline unsigned int hweight16(unsigned int w)
return res;
}
static inline unsigned int hweight8(unsigned int w)
static inline unsigned int __arch_hweight8(unsigned int w)
{
unsigned int res;
@@ -78,9 +78,10 @@ static inline unsigned int hweight8(unsigned int w)
#else
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/arch_hweight.h>
#endif
#include <asm-generic/bitops/const_hweight.h>
#include <asm-generic/bitops/lock.h>
#endif /* __KERNEL__ */