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/* Copyright (C) 1994 W. Schelter
This file is part of GNU Common Lisp, herein referred to as GCL
GCL is free software; you can redistribute it and/or modify it under
the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GCL is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU library general public
license along with GCL; see the file COPYING. If not, write to the
Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* #include "include.h" */
#include "config.h"
/* #include "cmpinclude.h" */
/* #include "genpari.h" */
#include "arith.h"
object make_integer();
static unsigned plong small_pos_int[3]={0x1000003,0x01000003,0};
static unsigned plong small_neg_int[3]={0x1000003,0xff000003,0};
static unsigned plong s4_neg_int[4]={0x1000004,0xff000004,1,0};
object
fplus(a,b)
int a,b;
{ int z ;
int x;
if (a >= 0)
{ if (b >= 0)
{ x = a + b;
if (x == 0) return small_fixnum(0);
small_pos_int[2]=x;
return make_integer(small_pos_int);
}
else
{ /* b neg */
x = a + b;
return make_fixnum(x);
}}
else
{ /* a neg */
if (b >= 0)
{ x = a + b;
return make_fixnum(x);}
else
{ /* both neg */
{ unsigned plong Xtx,Xty,overflow,Xtres;
Xtres = addll(-a,-b);
if (overflow)
{
s4_neg_int[3]=Xtres;
return make_integer(s4_neg_int);}
else
{ small_neg_int[2]=Xtres;
return make_integer(small_neg_int);}
}}}
}
object
fminus(a,b)
int a,b;
{ int z ;
int x;
if (a >= 0)
{ if (b >= 0)
{ x = a - b;
return make_fixnum(x);
}
else
{ /* b neg */
x = a - b;
if (x==0) return small_fixnum(0);
small_pos_int[2]=x;
return make_integer(small_pos_int);
}}
else
{ /* a neg */
if (b <= 0)
{ x = a - b;
return make_fixnum(x);}
else
{ /* b positive */
{ unsigned plong Xtx,Xty,overflow,Xtres;
unsigned plong t[4];
Xtres = addll(-a,b);
if (overflow)
{ s4_neg_int[3]=Xtres;
return make_integer(s4_neg_int);}
else
{ small_neg_int[2]=Xtres;
return make_integer(small_neg_int);}
}}}
}
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