[Ffmpeg-cvslog] r6743 - trunk/libavcodec/cabac.h

[Michael Niedermayer]

Hi

On Fri, Oct 20, 2006 at 11:36:00AM +0200, Guillaume Poirier wrote:
> Hi,
> 
> michael wrote:
> > Author: michael
> > Date: Fri Oct 20 10:46:33 2006
> > New Revision: 6743
> > 
> > Modified:
> >    trunk/libavcodec/cabac.h
> > 
> > Log:
> > 1 instruction less
> > 
> > 
> > Modified: trunk/libavcodec/cabac.h
> > ==============================================================================
> > --- trunk/libavcodec/cabac.h	(original)
> > +++ trunk/libavcodec/cabac.h	Fri Oct 20 10:46:33 2006
> > @@ -696,11 +696,12 @@
> >          "addl %1, %%ecx                         \n\t"
> >          "movl %%ecx, (%%eax)                    \n\t"
> >          "addl $4, %%eax                         \n\t"
> > -        "movl %%eax, %2                         \n\t"
> >  
> >          "test $1, %%edx                         \n\t"
> >          " jnz 4f                                \n\t"
> >  
> > +        "movl %%eax, %2                         \n\t"
> > +
> >          "3:                                     \n\t"
> >          "addl $1, %1                            \n\t"
> >          "cmpl %5, %1                            \n\t"
> 
> I'm a little puzzled... how can there be one instruction less when
> what you did is just pull down one instruction?

its after a conditional branch now, so its one less if the branch is taken

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is