LXR linux/arch/x86/include/asm/arch

   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
  15static __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
  26static inline unsigned int __arch_hweight16(unsigned int w)
  27{
  28        return __arch_hweight32(w & 0xffff);
  29}
  30
  31static inline unsigned int __arch_hweight8(unsigned int w)
  32{
  33        return __arch_hweight32(w & 0xff);
  34}
  35
  36#ifdef CONFIG_X86_32
  37static inline unsigned long __arch_hweight64(__u64 w)
  38{
  39        return  __arch_hweight32((u32)w) +
  40                __arch_hweight32((u32)(w >> 32));
  41}
  42#else
  43static __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