Hi Soren,
You are right. This is certainly a performance decrease.
I made a fix for this. Actually case when srca == 0xff was not handled at all
in these two routines, but only on over_n_8888 this showed up, since MIPS fast
paths are using OVER combiner for 32bit destination.
I'll push another commit for these two fast-paths.
Current results look like this:
Referent (before):
over_n_0565 = L1: 14.48 L2: 21.36 M: 17.57 ( 23.30%) HT:
6.95 VT: 6.44 R: 6.39 RT: 2.16 ( 22Kops/s)
over_n_8888 = L1: 92.60 L2: 86.13 M: 24.41 ( 64.74%) HT:
8.94 VT: 8.06 R: 8.00 RT: 2.53 ( 25Kops/s)
Optimized:
over_n_0565 = L1: 27.65 L2: 189.22 M: 58.19 ( 77.12%) HT:
52.80 VT: 49.88 R: 47.53 RT: 23.67 ( 72Kops/s)
over_n_8888 = L1: 235.99 L2: 230.86 M: 29.09 ( 77.11%) HT:
27.95 VT: 27.24 R: 26.58 RT: 18.10 ( 67Kops/s)
Thanks,
Nemanja Lukic
-----Original Message-----
From: Søren Sandmann [mailto:[email protected]]
Sent: Monday, November 05, 2012 7:39 PM
To: Lukic, Nemanja
Cc: [email protected]; [email protected]
Subject: Re: [Pixman] [PATCH 3/3] MIPS: DSPr2: Added more fast-paths for OVER
operation:
Nemanja Lukic <[email protected]> writes:
> From: Nemanja Lukic <[email protected]>
>
> Performance numbers before/after on MIPS-74kc @ 1GHz:
>
> lowlevel-blt-bench results
>
> Referent (before):
> over_n_0565 = L1: 12.04 L2: 21.45 M: 18.50 ( 24.55%) HT: 6.93
> VT: 6.45 R: 6.38 RT: 2.16 ( 22Kops/s)
This one:
> over_n_8888 = L1: 93.76 L2: 85.96 M: 24.41 ( 64.78%) HT: 8.93
> VT: 8.08 R: 7.99 RT: 2.54 ( 25Kops/s)
> over_n_8888 = L1: 55.31 L2: 49.07 M: 28.60 ( 75.93%) HT: 23.99
> VT: 22.95 R: 22.34 RT: 12.85 ( 61Kops/s)
looks like a performance regression for L1 and L2?
Søren
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