[x265] [PATCH 2 of 2] asm:intra pred planar32 sse2 high bit

[Steve Borho]

On 03/10, dave wrote:
> On 03/09/2015 11:40 PM, Steve Borho wrote:
<snip>
> >No, but the command line option --cu-stats does show how much it is
> >called (but not how long it took)
> >
> This produces some interesting numbers.
> 
> Without using registers for constants
> 
> x265 [info]: I32: Intra 100%(DC 0% P 40% Ang 58%)
> 
> encoded 2000 frames in 95.98s (20.84 fps), 1020.04 kb/s
> 
> With using registers for constants
> 
> x265 [info]: I32: Intra 99%(DC 39% P 16% Ang 43%)
> 
> encoded 2000 frames in 93.10s (21.48 fps), 1008.63 kb/s
> 
> I just added --cu-stats to the same command options that I used
> previously and I ran it several times and got exactly the same
> percentages.  Times varied by less than a second for each build.  So
> how can simple register usage in one primitive affect intra pred
> decisions?

it shouldn't, the behavior must be wrong in one of the cases. no change
in performance should be able to impact the encoder output (or any
coding decisions)

-- 
Steve Borho