From: Henrik Gramner via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Cc: Henrik Gramner <henrik@gramner.com>
Subject: Re: [FFmpeg-devel] [PATCH] libavcodec/h264pred: Remove pred8x8_horizontal_8_mmxext
Date: Sun, 3 Mar 2024 00:31:29 +0100
Message-ID: <CAFGUN0ohXZct9O0O4c5_RxxZ9EDLCX6aoSKx8ntGydRaFQoicw@mail.gmail.com> (raw)
In-Reply-To: <CAK+ULv6ZpQMBsVNEgrNBrc5Pv=SYdgnjBiJeCYEBZGOHXpEEeg@mail.gmail.com>
On Sat, Mar 2, 2024 at 10:13 PM Kieran Kunhya <kierank@obe.tv> wrote:
> SPLATB_LOAD m0, r0+r1*0-1, m2
> SPLATB_LOAD m1, r0+r1*1-1, m2
This adds an extra unnecessary shuffle in the SSE2 code as it splats
to a full register. The easiest way of fixing it would probably be to
unroll the macro and manually get rid of it.
Although on x86-64 it might be faster to do a 1->8 byte splat using a
GPR multiply with 0x0101010101010101.
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prev parent reply other threads:[~2024-03-02 23:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-02 21:12 Kieran Kunhya
2024-03-02 21:20 ` Andreas Rheinhardt
2024-03-02 21:31 ` James Almer
2024-03-02 21:37 ` Kieran Kunhya
2024-03-02 23:31 ` Henrik Gramner via ffmpeg-devel [this message]
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