LCOV - code coverage report
Current view: top level - arch/x86/include/asm - arch_hweight.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 8 12 66.7 %
Date: 2022-04-01 14:35:51 Functions: 0 2 0.0 %
Branches: 0 2 0.0 %

           Branch data     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                 :        378 : static __always_inline unsigned int __arch_hweight32(unsigned int w)
      16                 :            : {
      17                 :        378 :         unsigned int res;
      18                 :            : 
      19                 :        378 :         asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
      20                 :            :                          : "="REG_OUT (res)
      21                 :            :                          : REG_IN (w));
      22                 :            : 
      23         [ #  # ]:        378 :         return res;
      24                 :            : }
      25                 :            : 
      26                 :          0 : static inline unsigned int __arch_hweight16(unsigned int w)
      27                 :            : {
      28                 :          0 :         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                 :       2079 : static __always_inline unsigned long __arch_hweight64(__u64 w)
      44                 :            : {
      45                 :       2079 :         unsigned long res;
      46                 :            : 
      47                 :       2079 :         asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
      48                 :            :                          : "="REG_OUT (res)
      49                 :            :                          : REG_IN (w));
      50                 :            : 
      51                 :       2079 :         return res;
      52                 :            : }
      53                 :            : #endif /* CONFIG_X86_32 */
      54                 :            : 
      55                 :            : #endif

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