kernel-ark/arch/mips/include/asm/arch_hweight.h
David Daney 1a403d1d2e MIPS: Create and use asm/arch_hweight.h
Some MIPS ISA processor varients can do hweight operations
efficiently.

Split arch_hweight.h into a seperate file, and implement the
operations with __builtin_popcount{,ll} if supported.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Cc: David Daney <ddaney@caviumnetworks.com>
Patchwork: https://patchwork.linux-mips.org/patch/1430/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-08-05 13:26:02 +01:00

39 lines
792 B
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
#ifndef _ASM_ARCH_HWEIGHT_H
#define _ASM_ARCH_HWEIGHT_H
#ifdef ARCH_HAS_USABLE_BUILTIN_POPCOUNT
#include <asm/types.h>
static inline unsigned int __arch_hweight32(unsigned int w)
{
return __builtin_popcount(w);
}
static inline unsigned int __arch_hweight16(unsigned int w)
{
return __builtin_popcount(w & 0xffff);
}
static inline unsigned int __arch_hweight8(unsigned int w)
{
return __builtin_popcount(w & 0xff);
}
static inline unsigned long __arch_hweight64(__u64 w)
{
return __builtin_popcountll(w);
}
#else
#include <asm-generic/bitops/arch_hweight.h>
#endif
#endif /* _ASM_ARCH_HWEIGHT_H */