lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sparc: Use popc if possible for hweight routines.

Browse Source 
Just like powerpc, we code patch at boot time.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-07-29 09:42:07 -07:00
parent e95ade0839
commit ef7c4d4675
7 changed files with 102 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
arch/sparc/include/asm/bitops_64.h
View File

@@ -42,45 +42,11 @@ extern void change_bit(unsigned long nr, volatile unsigned long *addr);
* of bits set) of a N-bit word
*/
#ifdef ULTRA_HAS_POPULATION_COUNT
extern unsigned long __arch_hweight64(__u64 w);
extern unsigned int __arch_hweight32(unsigned int w);
extern unsigned int __arch_hweight16(unsigned int w);
extern unsigned int __arch_hweight8(unsigned int w);
static inline unsigned int __arch_hweight64(unsigned long w)
{
unsigned int res;
__asm__ ("popc %1,%0" : "=r" (res) : "r" (w));
return res;
}
static inline unsigned int __arch_hweight32(unsigned int w)
{
unsigned int res;
__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff));
return res;
}
static inline unsigned int __arch_hweight16(unsigned int w)
{
unsigned int res;
__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff));
return res;
}
static inline unsigned int __arch_hweight8(unsigned int w)
{
unsigned int res;
__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff));
return res;
}
#else
#include <asm-generic/bitops/arch_hweight.h>
#endif
#include <asm-generic/bitops/const_hweight.h>
#include <asm-generic/bitops/lock.h>
#endif /* __KERNEL__ */