From maintainers-request at octave dot org Thu Nov 11 22:47:09 2004
Subject: Re: gcc 3.4 and Octave/lapack problems
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: "Dmitri A. Sergatskov" <dmitri at unm dot edu>
Cc: maintainers at octave dot org
Date: Thu, 11 Nov 2004 23:43:20 -0500

On 11-Nov-2004, Dmitri A. Sergatskov <dmitri at unm dot edu> wrote:

| BTW, according to  Jakub Jelinek
| (https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=138683)
| 
| <<<<
| ...
| 	IMHO you want to open a bug against lapack (and/or octave) and request that
| 	it be compiled in two versions on IA-32: -ffloat-store and -mfpmath=sse -msse2
| 	(the latter for P4 & recent AMD CPUs).
| ...
|  >>>>

If we have to know whether we are using a P4 or some recent AMD CPU
(how recent, what does that mean?) to decide whether to use these
options, then someone else will have to write the configure tests.

In any case, seems like trouble for binary packages.

I would prefer to find a reasonable solution that will work on all
platforms.  Those who want the absolute best performance (possibly at
the expense of accuracy) can always build for their platform with
special options.

jwe