[FFmpeg-devel] [PATCH 1/4] tests/checkasm: add overflow test for hevc_add_res

[Fu, Linjie]

Hi,

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Fu,
> Linjie
> Sent: Wednesday, December 18, 2019 09:55
> To: FFmpeg development discussions and patches <ffmpeg-
> devel at ffmpeg.org>; alexandra at khirnov.net; cus at passwd.hu; Paul B Mahol
> <onemda at gmail.com>; jamrial at gmail.com; u at pkh.me
> Subject: Re: [FFmpeg-devel] [PATCH 1/4] tests/checkasm: add overflow test
> for hevc_add_res
> 
> Hi,
> 
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
> Fu,
> > Linjie
> > Sent: Sunday, December 15, 2019 10:02
> > To: FFmpeg development discussions and patches <ffmpeg-
> > devel at ffmpeg.org>; jamrial at gmail.com; u at pkh.me; Pierre-
> > Edouard.Lepere at insa-rennes.fr
> > Subject: Re: [FFmpeg-devel] [PATCH 1/4] tests/checkasm: add overflow
> test
> > for hevc_add_res
> >
> > Hi,
> >
> > > -----Original Message-----
> > > From: Fu, Linjie <linjie.fu at intel.com>
> > > Sent: Wednesday, December 11, 2019 16:46
> > > To: ffmpeg-devel at ffmpeg.org
> > > Cc: Fu, Linjie <linjie.fu at intel.com>; Xu, Guangxin
> <guangxin.xu at intel.com>
> > > Subject: [PATCH 1/4] tests/checkasm: add overflow test for
> hevc_add_res
> > >
> > > Add overflow test for hevc_add_res when int16_t coeff = -32768.
> > > The result of C is good, while ASM is not.
> > >
> > > To verify:
> > >     make fate-checkasm-hevc_add_res
> > >     ffmpeg/tests/checkasm/checkasm --test=hevc_add_res
> > >
> > > ./checkasm --test=hevc_add_res
> > > checkasm: using random seed 679391863
> > > MMXEXT:
> > >     hevc_add_res_4x4_8_mmxext (hevc_add_res.c:69)
> > >   - hevc_add_res.add_residual [FAILED]
> > > SSE2:
> > >     hevc_add_res_8x8_8_sse2 (hevc_add_res.c:69)
> > >     hevc_add_res_16x16_8_sse2 (hevc_add_res.c:69)
> > >     hevc_add_res_32x32_8_sse2 (hevc_add_res.c:69)
> > >   - hevc_add_res.add_residual [FAILED]
> > > AVX:
> > >     hevc_add_res_8x8_8_avx (hevc_add_res.c:69)
> > >     hevc_add_res_16x16_8_avx (hevc_add_res.c:69)
> > >     hevc_add_res_32x32_8_avx (hevc_add_res.c:69)
> > >   - hevc_add_res.add_residual [FAILED]
> > > AVX2:
> > >     hevc_add_res_32x32_8_avx2 (hevc_add_res.c:69)
> > >   - hevc_add_res.add_residual [FAILED]
> > > checkasm: 8 of 14 tests have failed
> > >
> > > Signed-off-by: Xu Guangxin <guangxin.xu at intel.com>
> > > Signed-off-by: Linjie Fu <linjie.fu at intel.com>
> > > ---
> > >  tests/checkasm/hevc_add_res.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/tests/checkasm/hevc_add_res.c
> > > b/tests/checkasm/hevc_add_res.c
> > > index e92c6b4..a6e3b8a 100644
> > > --- a/tests/checkasm/hevc_add_res.c
> > > +++ b/tests/checkasm/hevc_add_res.c
> > > @@ -58,6 +58,7 @@ static void check_add_res(HEVCDSPContext h, int
> > > bit_depth)
> > >
> > >          randomize_buffers(res0, size);
> > >          randomize_buffers2(dst0, size);
> > > +        res0[0] = 0x8000;// overflow test
> > >          memcpy(res1, res0, sizeof(*res0) * size);
> > >          memcpy(dst1, dst0, sizeof(int16_t) * size);
> > >
> > > --
> > > 2.7.4
> > A kindly ping.
> > Any comments towards this?
> >
> Ping, and looking forward to any feedbacks.
> 
> This overflow does affect the decode of the clips with coeff=-32768, and
> makes it
> difficult(unless by --disbale-asm) to use software decoded result as a
> reference for
> comparation with the hardware decoder.

Ping for review.
Same issue exists in h264_idct.asm and make the decode fail.
IMHO we should get this fixed firstly.

- linjie