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DINFINITY alpha not gnu/linux

From: John W. Eaton
Subject: DINFINITY alpha not gnu/linux
Date: Mon, 16 Feb 2004 16:51:42 -0600

On 17-Feb-2004, Kevin Ryde <address@hidden> wrote:

| I see numbers.c guile_ieee_init is setup to use DINFINITY on
|       defined (__alpha__) && ! defined (linux)
| DINFINITY is not available on alpha freebsd.  I take it it's an
| OSF-ism.  There really wants to be an autoconf probe for DINFINITY,
| rather than cpp defines.

I think this code is probably my fault.  I took it from Octave, which
is what I originally wrote it for.

Octave now uses

  #if defined (SCO)
        volatile double tmp = 1.0;
        tmp_inf = 1.0 / (tmp - tmp);
  #elif defined (__alpha__) && defined (__osf__)
        extern unsigned int DINFINITY[2];
        tmp_inf =  (*(X_CAST(double *, DINFINITY)));
        double tmp = 1e+10;
        tmp_inf = tmp;
        for (;;)
            tmp_inf *= 1e+10;
            if (tmp_inf == tmp)
            tmp = tmp_inf;

to define Inf, but there may be better ways to do this.  If so, please
pass the code back to Octave as well as fixing guile.



-- | | Peace would shock and awe me.

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