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
15#define __HAVE_ARCH_SW_HWEIGHT
16
17static __always_inline unsigned int __arch_hweight32(unsigned int w)
18{
19 unsigned int res;
20
21 asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
22 : "="REG_OUT (res)
23 : REG_IN (w));
24
25 return res;
26}
27
28static inline unsigned int __arch_hweight16(unsigned int w)
29{
30 return __arch_hweight32(w & 0xffff);
31}
32
33static inline unsigned int __arch_hweight8(unsigned int w)
34{
35 return __arch_hweight32(w & 0xff);
36}
37
38#ifdef CONFIG_X86_32
39static inline unsigned long __arch_hweight64(__u64 w)
40{
41 return __arch_hweight32((u32)w) +
42 __arch_hweight32((u32)(w >> 32));
43}
44#else
45static __always_inline unsigned long __arch_hweight64(__u64 w)
46{
47 unsigned long res;
48
49 asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
50 : "="REG_OUT (res)
51 : REG_IN (w));
52
53 return res;
54}
55#endif /* CONFIG_X86_32 */
56
57#endif
58