On Mon, 14 Nov 2005 23:05:31 -0800 David Sharp <[EMAIL PROTECTED]> babbled:

> On 11/14/05, The Rasterman Carsten Haitzler <[EMAIL PROTECTED]> wrote:
> > On Tue, 15 Nov 2005 05:58:52 +0000 Mike Frysinger <[EMAIL PROTECTED]>
> > babbled:
> >
> > > On Tue, Nov 15, 2005 at 06:38:33AM +0100, Vincent Torri wrote:
> > > >
> > > > maybe one should test in configure.in if the processor is an mad64 or
> > > > not, then define a specific flag according tot the arch and add it to
> > > > the flags when one compiles.
> > >
> > > gcc bugs change greatly between releases ... trying to track which CFLAGS
> > > are 'safe' and which ones are not is a huge pita
> > >
> > > a lot easier to say to the user:
> > > dont use stupid optimizations
> >
> > -funroll-loops... ummm (i just HAD to say that!)
> >
> > um.. the main problem is gcc4's amd64 build usies sse math by DEFAULT -
> > thats the problem.
> 
> not just gcc4, i have gcc 3.4.4 here, and it compiles sse by default.
> 
> > i frankly dont know what exactly the problewm is - someone being
> > able to print a list of results, variables over a series of calculations and
> > plot the difference (errors) in them all at all stages (all intermediate
> > variable values too) would be useful.
> 
> this is exactly what i did. i'll attach my boneheaded program and
> results, including binaries in case you want to disassemble or
> something. Hopefully it will be useful to you.
> 
> Right off the bat, the first thing i notice is that all errors are
> introduced in divisions, but not all divisions.

not much i can do as i have no amd64 box... but others can check in on it... 

-- 
------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler)    [EMAIL PROTECTED]
裸好多
Tokyo, Japan (東京 日本)


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