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55 lines
1.1 KiB
55 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_HWEIGHT_H |
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#define _ASM_X86_HWEIGHT_H |
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#include <asm/cpufeatures.h> |
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#ifdef CONFIG_64BIT |
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#define REG_IN "D" |
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#define REG_OUT "a" |
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#else |
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#define REG_IN "a" |
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#define REG_OUT "a" |
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#endif |
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static __always_inline unsigned int __arch_hweight32(unsigned int w) |
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{ |
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unsigned int res; |
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asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT) |
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: "="REG_OUT (res) |
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: REG_IN (w)); |
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return res; |
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} |
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static inline unsigned int __arch_hweight16(unsigned int w) |
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{ |
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return __arch_hweight32(w & 0xffff); |
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} |
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static inline unsigned int __arch_hweight8(unsigned int w) |
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{ |
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return __arch_hweight32(w & 0xff); |
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} |
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#ifdef CONFIG_X86_32 |
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static inline unsigned long __arch_hweight64(__u64 w) |
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{ |
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return __arch_hweight32((u32)w) + |
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__arch_hweight32((u32)(w >> 32)); |
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} |
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#else |
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static __always_inline unsigned long __arch_hweight64(__u64 w) |
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{ |
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unsigned long res; |
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asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT) |
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: "="REG_OUT (res) |
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: REG_IN (w)); |
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return res; |
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} |
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#endif /* CONFIG_X86_32 */ |
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#endif
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