[tremor] ARM ASM performance gains, EVC vs. GCC

[marc dukette]

I have an OK understanding of GCC and I have done some usage of GCC ASM in
eVC projects for ARM, but have never gotten any performance improvements,
maybe this one would.  The only way I have done it is to take the ASM and
rework it to work in ARMASM, then link the obj file into the project.  I
would like to decipher why eVC is picking and chosing the inlines to use
however, for instance right now I just notices it will not inline bitrev12.

----- Original Message -----
From: "Werner Sharp" <werner at sharp-software.com>
To: <tremor at xiph.org>
Sent: Wednesday, October 09, 2002 5:43 PM
Subject: Re: [tremor] ARM ASM performance gains, EVC vs. GCC

<p>> Hi Marc,
>
> I don't have any ideas about the inline expansion.  What are your project
> setting for the inline optimization?    I have it set to "Only __inline"
but
> there's also "Any suitable".   Maybe choosing the latter would get it
> inlined.
>
> One of us EVC wimps should really get GCC installed and see if it provides
> better performance for this.   I just haven't found the time to get it
done.
> Do all I need is the cygwin tools installed with gcc?   Or is there a
> special ARM-COFF version that I would need to get?
>
> -Werner
>
> ----- Original Message -----
> From: "marc dukette" <dukette at adelphia.net>
> To: <tremor at xiph.org>
> Sent: Wednesday, October 09, 2002 5:08 PM
> Subject: Re: [tremor] ARM ASM performance gains, EVC vs. GCC
>
>
> > ok, this is Bizarre, eVC should actually accept the __inline for
function
> in
> > an included header file.  In fact if you look at the assembly from the
> last
> > go around I think you will see the MULT31 is actually generated
properly,
> > however the XPROD function is not.  Interestingly this was the case with
> > both my  and Werner's compile(we are not sharing projects).  Now for the
> > real mystery... in the codebase you provided with your patch this now
> works
> > for the XPROD functions and I do see a minimal performance improvement
by
> > replacing the MACROS with your inline functions.  I can however go back
to
> > the last codebase, with the same eVC project file, and it will NOT allow
> the
> > XPROD functions to be inlined.  I will continue digging on this, Werner,
> any
> > ideas?  I guess I should check some of my other projects to make sure
the
> > functions that are suppose to be inline really are.
> >
> > That aside PocketDivx will now be switching to Tremor as it now
> outperforms
> > Nicholas' original port of vorbis. Nice job!!
> >
> > ----- Original Message -----
> > From: "Nicolas Pitre" <nico at cam.org>
> > To: "marc dukette" <dukette at adelphia.net>
> > Cc: <tremor at xiph.org>
> > Sent: Wednesday, October 09, 2002 3:34 PM
> > Subject: Re: [tremor] ARM ASM performance gains, EVC vs. GCC
> >
> >
> > > On Wed, 9 Oct 2002, marc dukette wrote:
> > >
> > > > well as for making eVC use the inline, yeah I had missed this. eVC
> will
> > only
> > > > respect inline functions in the same file.  It'll be a little ugly,
> but
> > I
> > > > should be able to make this work.
> > >
> > > Does this include files which are #included as well?  If so that's the
> > case
> > > for GCC as well.
> > >
> > >
> > > Nicolas
> > >
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