arch/x86/include/asm/arch_hweight.h

   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
  15 #define __HAVE_ARCH_SW_HWEIGHT
  16
  17 static __always_inline unsigned int __arch_hweight32(unsigned int w)
  18 {
  19         unsigned int res;
  20
  21         asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
  22                          : "="REG_OUT (res)
  23                          : REG_IN (w));
  24
  25         return res;
  26 }
  27
  28 static inline unsigned int __arch_hweight16(unsigned int w)
  29 {
  30         return __arch_hweight32(w & 0xffff);
  31 }
  32
  33 static inline unsigned int __arch_hweight8(unsigned int w)
  34 {
  35         return __arch_hweight32(w & 0xff);
  36 }
  37
  38 #ifdef CONFIG_X86_32
  39 static inline unsigned long __arch_hweight64(__u64 w)
  40 {
  41         return  __arch_hweight32((u32)w) +
  42                 __arch_hweight32((u32)(w >> 32));
  43 }
  44 #else
  45 static __always_inline unsigned long __arch_hweight64(__u64 w)
  46 {
  47         unsigned long res;
  48
  49         asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
  50                          : "="REG_OUT (res)
  51                          : REG_IN (w));
  52
  53         return res;
  54 }
  55 #endif /* CONFIG_X86_32 */
  56
  57 #endif