56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/* 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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