[Ffmpeg-devel] benchmark of different CABAC routines

[Guillaume Poirier]

Hi,

Guillaume POIRIER wrote:
> Hi,
> 
> On 10/10/06, Guillaume Poirier <gpoirier at mplayerhq.hu> wrote:
> 
>> With svn-r6623
>>
>> On P-M (2nd generation)
>> vanilla:
>> 3899 dezicycles in decode_residual, 2095922 runs, 1230 skipsbits/s
>> dup=0 drop=0,
>>
>> with asm routine of renorm_cabac_decoder_once which has cmov in it
>> 3897 dezicycles in decode_residual, 2095978 runs, 1174 skipsbits/s
>> dup=0 drop=0
>>
>>
>> with CMOV_IS_FAST
>> 3825 dezicycles in decode_residual, 2096057 runs, 1095 skipsbits/s
>> dup=0 drop=0
>>
>> with CMOV_IS_FAST + asm routine of renorm_cabac_decoder_once which has
>> cmov in it
>> 3807 dezicycles in decode_residual, 2096022 runs, 1130 skipsbits/s
>> dup=0 drop=0
>>
>> So on P-M (which is a P3 variant), the winner is CMOV_IS_FAST + asm
>> routine of renorm_cabac_decoder_once which has cmov in it (2.36% faster)
> 
> 
> I forgot to mention which sample I used:
> http://samples.mplayerhq.hu/V-codecs/AVC1/NeroRecode_STD_AVC_(ateme1022).mp4
> 
> 
> Now on AMD-64 (32 bits mode), with same sample
> 
> vanilla:
> 3695 dezicycles in decode_residual, 2095058 runs, 2094 skips
> 
> asm routine of renorm_cabac_decoder_once which has cmov in it
> 3695 dezicycles in decode_residual, 2094994 runs, 2158 skips
> 
> CMOV_IS_FAST
> 3616 dezicycles in decode_residual, 2095104 runs, 2048 skips
> 
> CMOV_IS_FAST + asm routine of renorm_cabac_decoder_once which has cmov
> in it
> 3616 dezicycles in decode_residual, 2095091 runs, 2061 skips


Damn, I didn't give --tune=pentium-m to configure script, so I guess
these benchs (AMD64 and P-M) need to be re-done later.

Guillaume