gnux86 FP interface on opteron

[Giulio Bottazzi <giulio dot bottazzi at libero dot it>]

On Wed, 5 Jan 2005 15:02:03 +0000
Brian Gough <bjg@network-theory.co.uk> wrote:

> 
> Try editing config.h after running ./configure
> and adding #define HAVE_GNUX86_IEEE_INTERFACE 1 at the appropriate
> point instead of the equivalent /* #undef ... */ line.

Done. And run check both in extended and double precision. Everything
seems fine.

> Look at the case statement in configure.ac to see why it is not being
> detected. Maybe because "opteron" does not match "*86-*-linux*" or
> something.

This is exactly the case. config.guess gives "x86_64-unknown-linux-gnu"
on the Opteron, which does not match the case

    *86-*-linux*) 
    ac_cv_c_ieee_interface=gnux86

in configure.ac.

I can see two solutions:

one is to replace the code above with

    *86*-*-linux*) 
    ac_cv_c_ieee_interface=gnux86

the second is to add a new case


    *86_64-*-linux*) 
    ac_cv_c_ieee_interface=gnux86_64


duplicate the following check about _FPU_SETCW also for *86_64
architecture and introduce a new

HAVE_GNUX86_64_IEEE_INTERFACE


In the first case, no modifications are needed to the source tree. In
the second, one should slightly modify ieee-utils/fp.c.

I can't choose... but you surely will.

Best,

	G.

-- 
Giulio Bottazzi                 PGP Key ID:BAB0A33F

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