lib/math/int_pow.c

   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/kernel.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 u64 int_pow(u64 base, unsigned int exp)
  20 {
  21         u64 result = 1;
  22
  23         while (exp) {
  24                 if (exp & 1)
  25                         result *= base;
  26                 exp >>= 1;
  27                 base *= base;
  28         }
  29
  30         return result;
  31 }
  32 EXPORT_SYMBOL_GPL(int_pow);