[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / arch_hweight.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_HWEIGHT_H
#define _ASM_X86_HWEIGHT_H

#include <asm/cpufeatures.h>

#ifdef CONFIG_64BIT
/* popcnt %edi, %eax */
#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7"
/* popcnt %rdi, %rax */
#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7"
#define REG_IN "D"
#define REG_OUT "a"
#else
/* popcnt %eax, %eax */
#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0"
#define REG_IN "a"
#define REG_OUT "a"
#endif

#define __HAVE_ARCH_SW_HWEIGHT

static __always_inline unsigned int __arch_hweight32(unsigned int w)
{
	unsigned int res;

	asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT)
			 : "="REG_OUT (res)
			 : REG_IN (w));

	return res;
}

static inline unsigned int __arch_hweight16(unsigned int w)
{
	return __arch_hweight32(w & 0xffff);
}

static inline unsigned int __arch_hweight8(unsigned int w)
{
	return __arch_hweight32(w & 0xff);
}

#ifdef CONFIG_X86_32
static inline unsigned long __arch_hweight64(__u64 w)
{
	return  __arch_hweight32((u32)w) +
		__arch_hweight32((u32)(w >> 32));
}
#else
static __always_inline unsigned long __arch_hweight64(__u64 w)
{
	unsigned long res;

	asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT)
			 : "="REG_OUT (res)
			 : REG_IN (w));

	return res;
}
#endif /* CONFIG_X86_32 */

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _ASM_X86_HWEIGHT_H
	3	#define _ASM_X86_HWEIGHT_H
	4
	5	#include <asm/cpufeatures.h>
	6
	7	#ifdef CONFIG_64BIT
	8	/* popcnt %edi, %eax */
	9	#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7"
	10	/* popcnt %rdi, %rax */
	11	#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7"
	12	#define REG_IN "D"
	13	#define REG_OUT "a"
	14	#else
	15	/* popcnt %eax, %eax */
	16	#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0"
	17	#define REG_IN "a"
	18	#define REG_OUT "a"
	19	#endif
	20
	21	#define __HAVE_ARCH_SW_HWEIGHT
	22
	23	static __always_inline unsigned int __arch_hweight32(unsigned int w)
	24	{
	25	unsigned int res;
	26
	27	asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT)
	28	: "="REG_OUT (res)
	29	: REG_IN (w));
	30
	31	return res;
	32	}
	33
	34	static inline unsigned int __arch_hweight16(unsigned int w)
	35	{
	36	return __arch_hweight32(w & 0xffff);
	37	}
	38
	39	static inline unsigned int __arch_hweight8(unsigned int w)
	40	{
	41	return __arch_hweight32(w & 0xff);
	42	}
	43
	44	#ifdef CONFIG_X86_32
	45	static inline unsigned long __arch_hweight64(__u64 w)
	46	{
	47	return __arch_hweight32((u32)w) +
	48	__arch_hweight32((u32)(w >> 32));
	49	}
	50	#else
	51	static __always_inline unsigned long __arch_hweight64(__u64 w)
	52	{
	53	unsigned long res;
	54
	55	asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT)
	56	: "="REG_OUT (res)
	57	: REG_IN (w));
	58
	59	return res;
	60	}
	61	#endif /* CONFIG_X86_32 */
	62
	63	#endif