Re: [FFmpeg-devel] [PATCH 3/4] checkasm: hevc_pel: Use helpers for checking for writes out of bounds

["Martin Storsjö" <martin@martin.st>]

On Tue, 1 Apr 2025, yinshiyou-hf@loongson.cn wrote:

>> -----原始邮件-----
>> 发件人: "Martin Storsjö" <martin@martin.st>
>> 发送时间:2025-04-01 17:35:16 (星期二)
>> 收件人: ffmpeg-devel@ffmpeg.org
>> 抄送: jinbo <jinbo@loongson.cn>, yinshiyou-hf@loongson.cn, "Lu Wang" <wanglu@loongson.cn>
>> 主题: Re: [PATCH 3/4] checkasm: hevc_pel: Use helpers for checking for writes out of bounds
>> 
>> On Wed, 26 Mar 2025, Martin Storsjö wrote:
>> 
>> > This allows catching whether the functions write outside of
>> > the designated rectangle, and if run with "checkasm -v", it also
>> > prints out on which side of the rectangle the overwrite was.
>> > ---
>> > tests/checkasm/hevc_pel.c | 157 ++++++++++++++++++++++----------------
>> > 1 file changed, 90 insertions(+), 67 deletions(-)
>> 
>> This patch exposes existing issues in the Loongson HEVC simd; running with 
>> "checkasm --test=hevc_pel -v" after applying these patches, shows the 
>> following errors:
>> 
>> LSX:
>>   - hevc_pel.qpel       [OK]
>>   - hevc_pel.qpel_uni   [OK]
>>   - hevc_pel.qpel_uni_w [OK]
>>     put_hevc_pel_bi_pixels12_8_lsx (src/tests/checkasm/hevc_pel.c:272)
>> dst (12x12):
>>   overwrite below
>>   - hevc_pel.qpel_bi    [FAILED]
>>   - hevc_pel.epel       [OK]
>>     put_hevc_epel_uni_v24_8_lsx (src/tests/checkasm/hevc_pel.c:433)
>> dst (24x24):
>>   overwrite below
>>     put_hevc_epel_uni_hv12_8_lsx (src/tests/checkasm/hevc_pel.c:433)
>> dst (12x12):
>>   overwrite below
>>   - hevc_pel.epel_uni   [FAILED]
>>   - hevc_pel.epel_uni_w [OK]
>>     put_hevc_epel_bi_hv6_8_lsx (src/tests/checkasm/hevc_pel.c:545)
>> dst (6x6):
>>   overwrite below
>>   - hevc_pel.epel_bi    [FAILED]
>> LASX:
>>   - hevc_pel.qpel_uni   [OK]
>>   - hevc_pel.qpel_uni_w [OK]
>>   - hevc_pel.epel_uni_w [OK]
>>   - hevc_pel.epel_bi    [OK]
>> checkasm: 4 of 231 tests have failed
>> 
>> 
>> So the functions seem to produce more output rows than requested, for 
>> "uneven" heights like 6, 12 or 24 pixels.
>> 
>> Can someone from Loongson please have a look at this?
>> 
>> We don't seem to have any Loongson instances on fate, so can I go ahead 
>> and push this, without waiting for the Loongson assembly to be fixed? We 
>> do have some on patchwork though, so I guess that'll make patchwork noisy 
>> for everybody else until it is fixed, so I guess I'll have to hold off of 
>> this patch until it is fixed.
>> 
>> // Martin
>
> OK，go head.
> I will try to fix it in few days.

I was told that the loongarch machine is taken out from patchwork for now, 
so we can go ahead and land this, and hopefully the loongarch assembly 
gets fixed soon afterwards - so I'll push this now.

// Martin
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