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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>
This commit is contained in:
David Daney 2010-06-25 16:46:07 -07:00 committed by Ralf Baechle
parent d16f7093b6
commit 1a403d1d2e
2 changed files with 42 additions and 1 deletions
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38
arch/mips/include/asm/arch_hweight.h Normal file
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@ -0,0 +1,38 @@
/*
* 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 */

5
arch/mips/include/asm/bitops.h
View File

@ -700,7 +700,10 @@ static inline int ffs(int word)
#ifdef __KERNEL__
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#include <asm/arch_hweight.h>
#include <asm-generic/bitops/const_hweight.h>
#include <asm-generic/bitops/ext2-non-atomic.h>
#include <asm-generic/bitops/ext2-atomic.h>
#include <asm-generic/bitops/minix.h>