LCOV - code coverage report
Current view: top level - include/linux - math64.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 1 1 100.0 %

          Line data    Source code
       1             : #ifndef _LINUX_MATH64_H
       2             : #define _LINUX_MATH64_H
       3             : 
       4             : #include <linux/types.h>
       5             : #include <asm/div64.h>
       6             : 
       7             : #if BITS_PER_LONG == 64
       8             : 
       9             : /**
      10             :  * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
      11             :  *
      12             :  * This is commonly provided by 32bit archs to provide an optimized 64bit
      13             :  * divide.
      14             :  */
      15             : static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
      16             : {
      17             :         *remainder = dividend % divisor;
      18             :         return dividend / divisor;
      19             : }
      20             : 
      21             : /**
      22             :  * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
      23             :  */
      24             : static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
      25             : {
      26             :         *remainder = dividend % divisor;
      27             :         return dividend / divisor;
      28             : }
      29             : 
      30             : /**
      31             :  * div64_u64 - unsigned 64bit divide with 64bit divisor
      32             :  */
      33             : static inline u64 div64_u64(u64 dividend, u64 divisor)
      34             : {
      35           1 :         return dividend / divisor;
      36             : }
      37             : 
      38             : #elif BITS_PER_LONG == 32
      39             : 
      40             : #ifndef div_u64_rem
      41             : static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
      42             : {
      43             :         *remainder = do_div(dividend, divisor);
      44             :         return dividend;
      45             : }
      46             : #endif
      47             : 
      48             : #ifndef div_s64_rem
      49             : extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
      50             : #endif
      51             : 
      52             : #ifndef div64_u64
      53             : extern u64 div64_u64(u64 dividend, u64 divisor);
      54             : #endif
      55             : 
      56             : #endif /* BITS_PER_LONG */
      57             : 
      58             : /**
      59             :  * div_u64 - unsigned 64bit divide with 32bit divisor
      60             :  *
      61             :  * This is the most common 64bit divide and should be used if possible,
      62             :  * as many 32bit archs can optimize this variant better than a full 64bit
      63             :  * divide.
      64             :  */
      65             : #ifndef div_u64
      66             : static inline u64 div_u64(u64 dividend, u32 divisor)
      67             : {
      68             :         u32 remainder;
      69             :         return div_u64_rem(dividend, divisor, &remainder);
      70             : }
      71             : #endif
      72             : 
      73             : /**
      74             :  * div_s64 - signed 64bit divide with 32bit divisor
      75             :  */
      76             : #ifndef div_s64
      77             : static inline s64 div_s64(s64 dividend, s32 divisor)
      78             : {
      79             :         s32 remainder;
      80             :         return div_s64_rem(dividend, divisor, &remainder);
      81             : }
      82             : #endif
      83             : 
      84             : u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
      85             : 
      86             : static __always_inline u32
      87             : __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
      88             : {
      89             :         u32 ret = 0;
      90             : 
      91             :         while (dividend >= divisor) {
      92             :                 /* The following asm() prevents the compiler from
      93             :                    optimising this loop into a modulo operation.  */
      94             :                 asm("" : "+rm"(dividend));
      95             : 
      96             :                 dividend -= divisor;
      97             :                 ret++;
      98             :         }
      99             : 
     100             :         *remainder = dividend;
     101             : 
     102             :         return ret;
     103             : }
     104             : 
     105             : #endif /* _LINUX_MATH64_H */

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