Line data    Source code

       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          14 : static __always_inline unsigned int __arch_hweight32(unsigned int w)
      16             : {
      17          14 :         unsigned int res;
      18             : 
      19          14 :         asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
      20             :                          : "="REG_OUT (res)
      21             :                          : REG_IN (w));
      22             : 
      23          14 :         return res;
      24             : }
      25             : 
      26             : static inline unsigned int __arch_hweight16(unsigned int w)
      27             : {
      28             :         return __arch_hweight32(w & 0xffff);
      29             : }
      30             : 
      31           0 : static inline unsigned int __arch_hweight8(unsigned int w)
      32             : {
      33           0 :         return __arch_hweight32(w & 0xff);
      34             : }
      35             : 
      36             : #ifdef CONFIG_X86_32
      37             : static inline unsigned long __arch_hweight64(__u64 w)
      38             : {
      39             :         return  __arch_hweight32((u32)w) +
      40             :                 __arch_hweight32((u32)(w >> 32));
      41             : }
      42             : #else
      43         405 : static __always_inline unsigned long __arch_hweight64(__u64 w)
      44             : {
      45         405 :         unsigned long res;
      46             : 
      47         405 :         asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
      48             :                          : "="REG_OUT (res)
      49             :                          : REG_IN (w));
      50             : 
      51         405 :         return res;
      52             : }
      53             : #endif /* CONFIG_X86_32 */
      54             : 
      55             : #endif