Line data    Source code

       1             : // SPDX-License-Identifier: GPL-2.0
       2             : /*
       3             :  * An integer based power function
       4             :  *
       5             :  * Derived from drivers/video/backlight/pwm_bl.c
       6             :  */
       7             : 
       8             : #include <linux/export.h>
       9             : #include <linux/math.h>
      10             : #include <linux/types.h>
      11             : 
      12             : /**
      13             :  * int_pow - computes the exponentiation of the given base and exponent
      14             :  * @base: base which will be raised to the given power
      15             :  * @exp: power to be raised to
      16             :  *
      17             :  * Computes: pow(base, exp), i.e. @base raised to the @exp power
      18             :  */
      19           0 : u64 int_pow(u64 base, unsigned int exp)
      20             : {
      21           0 :         u64 result = 1;
      22             : 
      23           0 :         while (exp) {
      24           0 :                 if (exp & 1)
      25           0 :                         result *= base;
      26           0 :                 exp >>= 1;
      27           0 :                 base *= base;
      28             :         }
      29             : 
      30           0 :         return result;
      31             : }
      32             : EXPORT_SYMBOL_GPL(int_pow);