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 | static __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 | |
26 | static inline unsigned int __arch_hweight16(unsigned int w) |
27 | { |
28 | return __arch_hweight32(w: w & 0xffff); |
29 | } |
30 | |
31 | static inline unsigned int __arch_hweight8(unsigned int w) |
32 | { |
33 | return __arch_hweight32(w: w & 0xff); |
34 | } |
35 | |
36 | #ifdef CONFIG_X86_32 |
37 | static inline unsigned long __arch_hweight64(__u64 w) |
38 | { |
39 | return __arch_hweight32((u32)w) + |
40 | __arch_hweight32((u32)(w >> 32)); |
41 | } |
42 | #else |
43 | static __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 |
56 | |