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Commit Graph

6 Commits

Author SHA1 Message Date
Lynne
bbe95f7353
x86: replace explicit REP_RETs with RETs
From x86inc:
> On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
> a branch or a branch target. So switch to a 2-byte form of ret in that case.
> We can automatically detect "follows a branch", but not a branch target.
> (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)

x86inc can automatically determine whether to use REP_RET rather than
REP in most of these cases, so impact is minimal. Additionally, a few
REP_RETs were used unnecessary, despite the return being nowhere near a
branch.

The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
years ago and 12 years ago, respectively.

In the future, everyone involved with x86inc should consider dropping
REP_RETs altogether.
2023-02-01 04:23:55 +01:00
Alan Kelly
a6724285fd sws: allow avx2 hscale to process inputs of any size.
The main loop processes blocks of 16 pixels. The tail processes blocks
of size 4.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2022-08-18 16:24:48 +02:00
James Almer
eab91c3e2e x86/scale_avx2: don't use $ for hex literals
Fixes compilation with AVX2 enabled yasm.

Signed-off-by: James Almer <jamrial@gmail.com>
2021-12-16 17:29:21 -03:00
Alan Kelly
9092e58c44 x86/scale_avx2: Change asm indent from 2 to 4 spaces.
Signed-off-by: James Almer <jamrial@gmail.com>
2021-12-16 13:42:04 -03:00
James Almer
76a3f961f8 x86/scale_avx2: add missing check for AVX2 assembler support
Should fix compilation with old yasm.

Signed-off-by: James Almer <jamrial@gmail.com>
2021-12-16 09:41:56 -03:00
Alan Kelly
f900a19fa9 libswscale: Adds ff_hscale8to15_4_avx2 and ff_hscale8to15_X4_avx2 for all filter sizes.
Fixes so that fate under 64 bit Windows passes.

These functions replace all ff_hscale8to15_*_ssse3 when avx2 is available.

Signed-off-by: James Almer <jamrial@gmail.com>
2021-12-15 20:04:59 -03:00