1a403d1d2e
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>
38 lines
792 B
C
38 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 */
|