在 2021/7/22 下午4:00, yinshiyou...@loongson.cn 写道:
> -----原始邮件-----
> 发件人: "Jiaxun Yang" <jiaxun.y...@flygoat.com>
> 发送时间: 2021-07-21 17:39:22 (星期三)
> 收件人: ffmpeg-devel@ffmpeg.org
> 抄送: yinshiyou...@loongson.cn, "Jin Bo" <ji...@loongson.cn>, "Jiaxun Yang"
<jiaxun.y...@flygoat.com>
> 主题: [FFmpeg-devel] [PATCH] Revert "libavcodec/mips: Fix specification of
instruction name"
>
> This reverts commit ebedd26eefe2ff4bbf5a358907c4e8e4b0d62eae.
>
> The original commit states that "gcc supports both of them,
> clang only supports the second type", it's obviousely not ture.
>
> Error: opcode not supported on this processor: loongson3a(mips64r2) `pxor
$f3,$f3,$f3'
>
> Tested with latest GCC11 and binutils 2.37.
>
> The statement is not true. I guess you may have a internal toolchain
modified
> for this purpose, but you're not the sole user of FFmpeg, you're breaking
> other users like Debian. Also I can't find clang with Loongson extention
> support every where.
>
> I'm reverting this for now. If you would like to implement it, another
approach
> could be make it as marco in mmiutils.h and filter it with #if
define(__clang__).
>
> Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com>
> Cc: Jin Bo <ji...@loongson.cn>
> Cc: yinshiyou...@loongson.cn
Thank you for your feedback, following are my opinions:
1）according to the instruction mannul, we should use 'pxor' to operate float
register.
Hi all,
+ Paul Hua for toolchain stuff
I wonder if it's available for general public?
2) MMI is loongson media extention，compiler from upstream not supported yet is
true.
If you are using FFmpeg on loongson platform, you can try to get compiler from
http://www.loongnix.org/index.php/GCC or use loongson repository download.
Loongnix-1.0 :http://ftp.loongnix.org/os/loongnix/1.0/os/
Loongnix-20-mips64el:http://ftp.loongnix.org/os/loongnix/20/mips64el
No that's not true, Loongson-MMI had upstream toolchain support for
Loongson-3A since 2019, which is binutils-2.32 and GCC-9.
And these instruction naming (and or xor) is available since 2008 for
Loongson-2F.
3) If you are using on other mips platform which MMI is unsupported, and MMI
havn't disabled automaticlly.
we will fix it soon.
MMI should be enable for generic MIPS platform as they intend to run on
Loongson as well.
4) on the safe side, I suggest to add pxor instruction check in configure check.
Or ifdef for clang only?
Thanks.
- Jiaxun
</ji...@loongson.cn></jiaxun.y...@flygoat.com></jiaxun.y...@flygoat.com></ji...@loongson.cn></jiaxun.y...@flygoat.com>
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