On 11/25/15, Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote:
> This removes wasteful pow(x, 2.0) that although not terribly important
> for speed, is still useless.
>
> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
> ------------------------------------------------------------------------------
> Observed while auditing the codebase for wasteful pow calls.
>
> ---
> libavfilter/af_dynaudnorm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavfilter/af_dynaudnorm.c b/libavfilter/af_dynaudnorm.c
> index 62a2653..5f412f5 100644
> --- a/libavfilter/af_dynaudnorm.c
> +++ b/libavfilter/af_dynaudnorm.c
> @@ -237,13 +237,13 @@ static void
> init_gaussian_filter(DynamicAudioNormalizerContext *s)
> // Pre-compute constants
> const int offset = s->filter_size / 2;
> const double c1 = 1.0 / (sigma * sqrt(2.0 * M_PI));
> - const double c2 = 2.0 * pow(sigma, 2.0);
> + const double c2 = 2.0 * sigma * sigma;
>
> // Compute weights
> for (i = 0; i < s->filter_size; i++) {
> const int x = i - offset;
>
> - s->weights[i] = c1 * exp(-(pow(x, 2.0) / c2));
> + s->weights[i] = c1 * exp(-x * x / c2);
> total_weight += s->weights[i];
> }
>
> --
> 2.6.2
>
> _______________________________________________
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>
probably ok
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