[FFmpeg-devel] [PATCH 01/14] arm: vp9itxfm: Template the quarter/half idct32 function

Michael Niedermayer michael at niedermayer.cc
Sun Mar 19 01:25:40 EET 2017

On Fri, Mar 17, 2017 at 12:10:06AM +0200, Martin Storsjö wrote:
> This reduces the number of lines and reduces the duplication.
> Also simplify the eob check for the half case.
> If we are in the half case, we know we at least will need to do the
> first three slices, we only need to check eob for the fourth one,
> so we can hardcode the value to check against instead of loading
> from the min_eob array.
> Since at most one slice can be skipped in the first pass, we can
> unroll the loop for filling zeros completely, as it was done for
> the quarter case before.
> This allows skipping loading the min_eob pointer when using the
> quarter/half cases.
> This is cherrypicked from libav commit
> 98ee855ae0cc118bd1d20921d6bdb14731832462.
> ---
>  libavcodec/arm/vp9itxfm_neon.S | 57 +++++++++++++++---------------------------
>  1 file changed, 20 insertions(+), 37 deletions(-)

patchset seems to pass fate under qemu arm


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I am the wisest man alive, for I know one thing, and that is that I know
nothing. -- Socrates
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