On Thu, Jan 16, 2020 at 07:27:05AM +0000, Fu, Ting wrote: > > > > -----Original Message----- > > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of > > Michael Niedermayer > > Sent: Wednesday, January 15, 2020 05:55 AM > > To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> > > Subject: Re: [FFmpeg-devel] [PATCH V7 1/2] libswscale/x86/yuv2rgb: Change > > inline assembly into nasm code > > > > On Fri, Jan 10, 2020 at 01:38:15AM +0800, Ting Fu wrote: > > > Signed-off-by: Ting Fu <ting...@intel.com> > > > --- > > > V7: > > > Fix compile issue when user configure with --disable-mmx. > > > Fix issue when running ./ffmpeg with --cpuflags mmx/ssse3. > > > Adjust the SIMD verify logic in libswscale/x86/yuv2rgb.c > > > > > > libswscale/x86/Makefile | 1 + > > > libswscale/x86/swscale.c | 16 +- > > > libswscale/x86/yuv2rgb.c | 66 ++--- > > > libswscale/x86/yuv2rgb_template.c | 467 ++++++------------------------ > > > libswscale/x86/yuv_2_rgb.asm | 270 +++++++++++++++++ > > > 5 files changed, 405 insertions(+), 415 deletions(-) create mode > > > 100644 libswscale/x86/yuv_2_rgb.asm > > > > The commit message seems a bit terse > > I think it should say if the sequence of instructions is unchanged and if > > it was > > benchmaked. If its the same speed, when the code is run the commit message > > should say that too > > > > the principle of this (inline -> nasm) is fine of course. > > > > > [...] > > > -static inline int RENAME(yuv420_rgb16)(SwsContext *c, const uint8_t > > > *src[], > > > - int srcStride[], > > > - int srcSliceY, int srcSliceH, > > > - uint8_t *dst[], int dstStride[]) > > > +static int RENAME(yuv420_rgb16)(SwsContext *c, const uint8_t *src[], > > > + int srcStride[], > > > + int srcSliceY, int > > > srcSliceH, > > > + uint8_t *dst[], int > > > +dstStride[]) > > > > maybe the removial of inline should be a seperate patch also there is the > > question why these wraper functions exist These do change from a a "free > > thing > > in inline asm" to a call overhead with C->NASM > > > Hi Michael, > > The wrapper functions initiate some variables and contain one 'for cycle'. > The variable initiation needs to access to the 'c->dstW', furthermore macro > SWS_MAX_ FILTER_SIZE is needed. Which means extra work and much more NASM > code. > If you still prefer to do all the things in assembly, I can change from > 'C->NASM' to 'call NASM function directly' in another further patch( for > current patch easier to review). > Or in my opinion, the cost in C->NASM can be ignored, and the initiation work > looks clearer in C, just let it be what it is now. > What do you think?
it probably makes no sense if its hard to convert that code thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB If you fake or manipulate statistics in a paper in physics you will never get a job again. If you fake or manipulate statistics in a paper in medicin you will get a job for life at the pharma industry.
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