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Date: Wed, 6 Jul 2022 19:11:21 +0200
From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Message-ID: <20220706171121.GO396728@pb2>
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Subject: Re: [FFmpeg-devel] [PATCH 2/2] avcodec/smacker: Optimize constant
 16bit audio output
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On Wed, May 04, 2022 at 11:39:54AM +0200, Tomas H=E4rdin wrote:
> tis 2022-05-03 klockan 18:30 +0200 skrev Michael Niedermayer:
> >=20
> > +=A0=A0=A0=A0=A0=A0=A0 } else if (stereo) {
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 val=A0 =3D 256*values[1] + values[0];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 val2 =3D 256*values[3] + values[2];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 for(; i < unp_size; i+=3D2) {
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 pred[0] +=3D val;
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 pred[1] +=3D val2;
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 *samples++ =3D pred[0];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 *samples++ =3D pred[1];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 }
> > +=A0=A0=A0=A0=A0=A0=A0 } else {
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 val =3D 256*values[1] + values[0];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 for(; i < unp_size; i++) {
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 pred[0] +=3D val;
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 *samples++ =3D pred[0];
> > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 }
> > +=A0=A0=A0=A0=A0=A0=A0 }
>=20
> Got any numbers on how much faster this is? Just out of curiosity

With the fuzzed sample:
before:
3263902379 decicycles in ABBB,     128 runs,      0 skips

after:
398977744 decicycles in ABBB,    1024 runs,      0 skips

the first times out after 128 runs which is why the runs differ

thx

[...]

--=20
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Opposition brings concord. Out of discord comes the fairest harmony.
-- Heraclitus

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