Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 1 | #ifndef _ASM_X86_HWEIGHT_H |
| 2 | #define _ASM_X86_HWEIGHT_H |
| 3 | |
Borislav Petkov | cd4d09e | 2016-01-26 22:12:04 +0100 | [diff] [blame] | 4 | #include <asm/cpufeatures.h> |
| 5 | |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 6 | #ifdef CONFIG_64BIT |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 7 | /* popcnt %edi, %eax */ |
| 8 | #define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7" |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 9 | /* popcnt %rdi, %rax */ |
H. Peter Anvin | c59bd56 | 2010-05-17 15:13:23 -0700 | [diff] [blame] | 10 | #define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7" |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 11 | #define REG_IN "D" |
| 12 | #define REG_OUT "a" |
| 13 | #else |
| 14 | /* popcnt %eax, %eax */ |
H. Peter Anvin | c59bd56 | 2010-05-17 15:13:23 -0700 | [diff] [blame] | 15 | #define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0" |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 16 | #define REG_IN "a" |
| 17 | #define REG_OUT "a" |
| 18 | #endif |
| 19 | |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 20 | #define __HAVE_ARCH_SW_HWEIGHT |
| 21 | |
Denys Vlasenko | d14edb1 | 2015-08-04 16:15:15 +0200 | [diff] [blame] | 22 | static __always_inline unsigned int __arch_hweight32(unsigned int w) |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 23 | { |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 24 | unsigned int res; |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 25 | |
H. Peter Anvin | c59bd56 | 2010-05-17 15:13:23 -0700 | [diff] [blame] | 26 | asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT) |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 27 | : "="REG_OUT (res) |
| 28 | : REG_IN (w)); |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 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 | |
Denys Vlasenko | d14edb1 | 2015-08-04 16:15:15 +0200 | [diff] [blame] | 43 | #ifdef CONFIG_X86_32 |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 44 | static inline unsigned long __arch_hweight64(__u64 w) |
| 45 | { |
Denys Vlasenko | d14edb1 | 2015-08-04 16:15:15 +0200 | [diff] [blame] | 46 | return __arch_hweight32((u32)w) + |
| 47 | __arch_hweight32((u32)(w >> 32)); |
| 48 | } |
| 49 | #else |
| 50 | static __always_inline unsigned long __arch_hweight64(__u64 w) |
| 51 | { |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 52 | unsigned long res; |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 53 | |
H. Peter Anvin | c59bd56 | 2010-05-17 15:13:23 -0700 | [diff] [blame] | 54 | asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT) |
Borislav Petkov | f596710 | 2016-05-30 12:56:27 +0200 | [diff] [blame] | 55 | : "="REG_OUT (res) |
| 56 | : REG_IN (w)); |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 57 | |
| 58 | return res; |
| 59 | } |
Denys Vlasenko | d14edb1 | 2015-08-04 16:15:15 +0200 | [diff] [blame] | 60 | #endif /* CONFIG_X86_32 */ |
Borislav Petkov | d61931d | 2010-03-05 17:34:46 +0100 | [diff] [blame] | 61 | |
| 62 | #endif |