On Apr 28, 2:32 pm, Francois <[EMAIL PROTECTED]> wrote:
> In my long task of getting sage on Gentoo I
> inspect spkg. So today I was creating an ebuild
> for quaddouble and looked at the config options
> available and the one used by sage and I see this:
> --enable-ieee-add use addition that satisfies IEEE-style error
> bound
> instead of Cray-style error bound.
> [default=no]
> --enable-sloppy-mul use fast but slightly inaccurate
> multiplication.
> [default=yes]
> --enable-sloppy-div use fast but slightly inaccurate division.
> [default=yes]
> None of these are changed from the default in
> quaddouble spkg-install, which means that sage
> use the sloppy options and Cray-style error bound.
> Is it really what we want in sage?
Hi Francois,
I do not think that we want the current defaults, but I am not sure.
Are there any performance implications? We are also not shipping the
current quaddouble code, so checking out what the current release does
might shed some light on this.
Unless somebody objects and thinks that the current default behavior
is the way to go we should switch to using "--enable-ieee-add"
Cheers,
Michael
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