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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 <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <20100318111929.GB11152@aftab>
Acked-by: H. Peter Anvin <[email protected]>
LKML-Reference: <1265028224.24455.154.camel@laptop>
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Peter Zijlstra 2010-02-01 15:03:07 +01:00 • committed by H. Peter Anvin
commit 1527bc8b92
8 changed files with 87 additions and 58 deletions
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18
arch/alpha/include/asm/bitops.h
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@ -405,29 +405,31 @@ static inline int fls(int x)
#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
/* Whee. EV67 can calculate it directly. */
static inline unsigned long hweight64(unsigned long w)
static inline unsigned long __arch_hweight64(unsigned long w)
{
return __kernel_ctpop(w);
}
static inline unsigned int hweight32(unsigned int w)
static inline unsigned int __arch_weight32(unsigned int w)
{
return hweight64(w);
return __arch_hweight64(w);
}
static inline unsigned int hweight16(unsigned int w)
static inline unsigned int __arch_hweight16(unsigned int w)
{
return hweight64(w & 0xffff);
return __arch_hweight64(w & 0xffff);
}
static inline unsigned int hweight8(unsigned int w)
static inline unsigned int __arch_hweight8(unsigned int w)
{
return hweight64(w & 0xff);
return __arch_hweight64(w & 0xff);
}
#else
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/arch_hweight.h>
#endif
#include <asm-generic/bitops/const_hweight.h>
#endif /* __KERNEL__ */
#include <asm-generic/bitops/find.h>