[FFmpeg-devel] [PATCH 3/3] avcodec/utvideodec: use cached bitstream reader

Carl Eugen Hoyos ceffmpeg at gmail.com
Thu Aug 23 17:07:12 EEST 2018

2018-08-23 16:00 GMT+02:00, Paul B Mahol <onemda at gmail.com>:
> On 8/23/18, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>> 2018-08-23 15:35 GMT+02:00, Carl Eugen Hoyos <ceffmpeg at gmail.com>:
>>> 2018-08-23 15:08 GMT+02:00, Paul B Mahol <onemda at gmail.com>:
>>>> From 100x real-time decoding to 138x real-time decoding for 320x240
>>>> video.
>>> On x86_64 I get an even better improvement, on x86_32
>>> decoding gets slower by approximately 10%.
>>> Without the patch, decoding is faster on x86_32 than
>>> x86_64 here...
>> Using vanilla gcc-6.4.
>> clang 3.4:
>> 5% slower with patch on x86_32
>>>40% faster with patch on x86_64
>> x86_32 again faster than x86_64 without patch.
> x86_32 is going to be less and less used.

Is there a reason why we cannot use
the change in the x86_64 case (and others that we
show to be faster) but not for x86_32?

Carl Eugen

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