[FFmpeg-devel] [PATCH] Call rdft by function pointer

[Måns Rullgård]

Alex Converse <alex.converse at gmail.com> writes:

> 2010/3/14 M?ns Rullg?rd <mans at mansr.com>:
>> Alex Converse <alex.converse at gmail.com> writes:
>>
>>> Call the RDFT by a function pointer like other FFT related transforms.
>>> This makes instruction set optimized versions possible.
>
>  void ff_rdft_calc(RDFTContext *s, FFTSample *data)
>  {
> -    ff_rdft_calc_c(s, data);
> +    s->rdft_calc(s, data);
>  }

To avoid double function call overhead, perhaps that function should
be moved to fft.h as an inline.

Side note: gcc sometimes fails to optimise a tail call through a
function pointer into a plain jump.

-- 
M?ns Rullg?rd
mans at mansr.com