LCOV - code coverage report
Current view: top level - include/asm-generic/bitops - fls64.h (source / functions) Hit Total Coverage
Test: Real Lines: 4 4 100.0 %
Date: 2020-10-17 15:46:16 Functions: 0 0 -
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _ASM_GENERIC_BITOPS_FLS64_H_
       3                 :            : #define _ASM_GENERIC_BITOPS_FLS64_H_
       4                 :            : 
       5                 :            : #include <asm/types.h>
       6                 :            : 
       7                 :            : /**
       8                 :            :  * fls64 - find last set bit in a 64-bit word
       9                 :            :  * @x: the word to search
      10                 :            :  *
      11                 :            :  * This is defined in a similar way as the libc and compiler builtin
      12                 :            :  * ffsll, but returns the position of the most significant set bit.
      13                 :            :  *
      14                 :            :  * fls64(value) returns 0 if value is 0 or the position of the last
      15                 :            :  * set bit if value is nonzero. The last (most significant) bit is
      16                 :            :  * at position 64.
      17                 :            :  */
      18                 :            : #if BITS_PER_LONG == 32
      19                 :            : static __always_inline int fls64(__u64 x)
      20                 :            : {
      21                 :          3 :         __u32 h = x >> 32;
      22                 :          3 :         if (h)
      23                 :          3 :                 return fls(h) + 32;
      24                 :          3 :         return fls(x);
      25                 :            : }
      26                 :            : #elif BITS_PER_LONG == 64
      27                 :            : static __always_inline int fls64(__u64 x)
      28                 :            : {
      29                 :            :         if (x == 0)
      30                 :            :                 return 0;
      31                 :            :         return __fls(x) + 1;
      32                 :            : }
      33                 :            : #else
      34                 :            : #error BITS_PER_LONG not 32 or 64
      35                 :            : #endif
      36                 :            : 
      37                 :            : #endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */
    

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