arch/mips/include/asm/arch_hweight.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/arch_hweight.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/arch_hweight.h
Extension
.h
Size
792 bytes
Lines
39
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#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 */

Annotation

Implementation Notes