Re: [PATCH v2 3/4] backlight: pwm_bl: drop use of int_pow()

2019-10-14 Thread Lee Jones
On Tue, 08 Oct 2019, Rasmus Villemoes wrote: > For a fixed small exponent of 3, it is more efficient to simply use > two explicit multiplications rather than calling the int_pow() library > function: Aside from the function call overhead, its implementation > using repeated squaring means it ends

[PATCH v2 3/4] backlight: pwm_bl: drop use of int_pow()

2019-10-08 Thread Rasmus Villemoes
For a fixed small exponent of 3, it is more efficient to simply use two explicit multiplications rather than calling the int_pow() library function: Aside from the function call overhead, its implementation using repeated squaring means it ends up doing four 64x64 multiplications. Reviewed-by: