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 & 0xffff);
29 }
30
31 static inline unsigned int __arch_hweight8(unsigned int w)
32 {
33 return __arch_hweight32(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
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