1#ifndef _ASM_X86_HWEIGHT_H
 2#define _ASM_X86_HWEIGHT_H
 3
 4#include <asm/cpufeatures.h>
 5
 6#ifdef CONFIG_64BIT
 7/* popcnt %edi, %eax -- redundant REX prefix for alignment */
 8#define POPCNT32 ".byte 0xf3,0x40,0x0f,0xb8,0xc7"
 9/* popcnt %rdi, %rax */
10#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7"
11#define REG_IN "D"
12#define REG_OUT "a"
13#else
14/* popcnt %eax, %eax */
15#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0"
16#define REG_IN "a"
17#define REG_OUT "a"
18#endif
19
20/*
21 * __sw_hweightXX are called from within the alternatives below
22 * and callee-clobbered registers need to be taken care of. See
23 * ARCH_HWEIGHT_CFLAGS in <arch/x86/Kconfig> for the respective
24 * compiler switches.
25 */
26static __always_inline unsigned int __arch_hweight32(unsigned int w)
27{
28	unsigned int res = 0;
29
30	asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT)
31		     : "="REG_OUT (res)
32		     : REG_IN (w));
33
34	return res;
35}
36
37static inline unsigned int __arch_hweight16(unsigned int w)
38{
39	return __arch_hweight32(w & 0xffff);
40}
41
42static inline unsigned int __arch_hweight8(unsigned int w)
43{
44	return __arch_hweight32(w & 0xff);
45}
46
47#ifdef CONFIG_X86_32
48static inline unsigned long __arch_hweight64(__u64 w)
49{
50	return  __arch_hweight32((u32)w) +
51		__arch_hweight32((u32)(w >> 32));
52}
53#else
54static __always_inline unsigned long __arch_hweight64(__u64 w)
55{
56	unsigned long res = 0;
57
58	asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT)
59		     : "="REG_OUT (res)
60		     : REG_IN (w));
61
62	return res;
63}
64#endif /* CONFIG_X86_32 */
65
66#endif

 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#define REG_IN "D"
 9#define REG_OUT "a"
10#else
 
 
11#define REG_IN "a"
12#define REG_OUT "a"
13#endif
14
 
 
 
 
 
 
15static __always_inline unsigned int __arch_hweight32(unsigned int w)
16{
17	unsigned int res;
18
19	asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
20			 : "="REG_OUT (res)
21			 : REG_IN (w));
22
23	return res;
24}
25
26static inline unsigned int __arch_hweight16(unsigned int w)
27{
28	return __arch_hweight32(w & 0xffff);
29}
30
31static inline unsigned int __arch_hweight8(unsigned int w)
32{
33	return __arch_hweight32(w & 0xff);
34}
35
36#ifdef CONFIG_X86_32
37static inline unsigned long __arch_hweight64(__u64 w)
38{
39	return  __arch_hweight32((u32)w) +
40		__arch_hweight32((u32)(w >> 32));
41}
42#else
43static __always_inline unsigned long __arch_hweight64(__u64 w)
44{
45	unsigned long res;
46
47	asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
48			 : "="REG_OUT (res)
49			 : REG_IN (w));
50
51	return res;
52}
53#endif /* CONFIG_X86_32 */
54
55#endif