Le torstaina 30. toukokuuta 2024, 22.06.55 EEST Rémi Denis-Courmont a écrit :
> The function pointer is appended to the structure for backward binary
> compatibility. Fortunately, this is allocated by libavutil, not by the
> user, so increasing the structure size is safe.
> ---
> libavutil/float_dsp.c | 12 ++++++++++++
> libavutil/float_dsp.h | 31 ++++++++++++++++++++++++++++++-
> 2 files changed, 42 insertions(+), 1 deletion(-)
>
> diff --git a/libavutil/float_dsp.c b/libavutil/float_dsp.c
> index e9fb023466..08bbc85e3e 100644
> --- a/libavutil/float_dsp.c
> +++ b/libavutil/float_dsp.c
> @@ -132,6 +132,17 @@ float avpriv_scalarproduct_float_c(const float *v1,
> const float *v2, int len) return p;
> }
>
> +double ff_scalarproduct_double_c(const double *v1, const double *v2,
> + size_t len)
> +{
> + double p = 0.0;
> +
> + for (size_t i = 0; i < len; i++)
> + p += v1[i] * v2[i];
> +
> + return p;
> +}
> +
If somebody wants to write x86 assembly, they can probably borrow most of the
code for evaluate_lls. It is a double precision scalar product with a little
bit of extra fluff in the prologue.
--
レミ・デニ-クールモン
http://www.remlab.net/
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