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