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1 | #ifndef _ASM_X86_HWEIGHT_H |
2 | #define _ASM_X86_HWEIGHT_H | |
3 | ||
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4 | #include <asm/cpufeatures.h> |
5 | ||
d61931d8 | 6 | #ifdef CONFIG_64BIT |
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7 | /* popcnt %edi, %eax */ |
8 | #define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7" | |
d61931d8 | 9 | /* popcnt %rdi, %rax */ |
c59bd568 | 10 | #define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7" |
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11 | #define REG_IN "D" |
12 | #define REG_OUT "a" | |
13 | #else | |
14 | /* popcnt %eax, %eax */ | |
c59bd568 | 15 | #define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0" |
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16 | #define REG_IN "a" |
17 | #define REG_OUT "a" | |
18 | #endif | |
19 | ||
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20 | #define __HAVE_ARCH_SW_HWEIGHT |
21 | ||
d14edb16 | 22 | static __always_inline unsigned int __arch_hweight32(unsigned int w) |
d61931d8 | 23 | { |
f5967101 | 24 | unsigned int res; |
d61931d8 | 25 | |
c59bd568 | 26 | asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT) |
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27 | : "="REG_OUT (res) |
28 | : REG_IN (w)); | |
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29 | |
30 | return res; | |
31 | } | |
32 | ||
33 | static inline unsigned int __arch_hweight16(unsigned int w) | |
34 | { | |
35 | return __arch_hweight32(w & 0xffff); | |
36 | } | |
37 | ||
38 | static inline unsigned int __arch_hweight8(unsigned int w) | |
39 | { | |
40 | return __arch_hweight32(w & 0xff); | |
41 | } | |
42 | ||
d14edb16 | 43 | #ifdef CONFIG_X86_32 |
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44 | static inline unsigned long __arch_hweight64(__u64 w) |
45 | { | |
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46 | return __arch_hweight32((u32)w) + |
47 | __arch_hweight32((u32)(w >> 32)); | |
d14edb16 | 48 | } |
d61931d8 | 49 | #else |
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50 | static __always_inline unsigned long __arch_hweight64(__u64 w) |
51 | { | |
f5967101 | 52 | unsigned long res; |
d14edb16 | 53 | |
c59bd568 | 54 | asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT) |
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55 | : "="REG_OUT (res) |
56 | : REG_IN (w)); | |
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57 | |
58 | return res; | |
59 | } | |
d14edb16 | 60 | #endif /* CONFIG_X86_32 */ |
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61 | |
62 | #endif |