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Diff for /OpenXM_contrib/gmp/mpz/Attic/sub.c between version 1.1.1.2 and 1.1.1.3

version 1.1.1.2, 2000/09/09 14:12:58 version 1.1.1.3, 2003/08/25 16:06:34
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 /* mpz_sub -- Subtract two integers.  /* mpz_sub -- subtract integers.
   
 Copyright (C) 1991, 1993, 1994, 1996, 2000 Free Software Foundation, Inc.  Copyright 2001 Free Software Foundation, Inc.
   
 This file is part of the GNU MP Library.  This file is part of the GNU MP Library.
   
Line 19  along with the GNU MP Library; see the file COPYING.LI
Line 19  along with the GNU MP Library; see the file COPYING.LI
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */  MA 02111-1307, USA. */
   
 #include "gmp.h"  
 #include "gmp-impl.h"  
 #ifdef BERKELEY_MP  
 #include "mp.h"  
 #endif  
   
 #ifndef BERKELEY_MP  #define OPERATION_sub
 void  #include "aors.h"
 #if __STDC__  
 mpz_sub (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)  
 #else  
 mpz_sub (w, u, v)  
      mpz_ptr w;  
      mpz_srcptr u;  
      mpz_srcptr v;  
 #endif  
 #else /* BERKELEY_MP */  
 void  
 #if __STDC__  
 msub (mpz_srcptr u, mpz_srcptr v, mpz_ptr w)  
 #else  
 msub (u, v, w)  
      mpz_srcptr u;  
      mpz_srcptr v;  
      mpz_ptr w;  
 #endif  
 #endif /* BERKELEY_MP */  
 {  
   mp_srcptr up, vp;  
   mp_ptr wp;  
   mp_size_t usize, vsize, wsize;  
   mp_size_t abs_usize;  
   mp_size_t abs_vsize;  
   
   usize = u->_mp_size;  
   vsize = -v->_mp_size;         /* The "-" makes the difference from mpz_add */  
   abs_usize = ABS (usize);  
   abs_vsize = ABS (vsize);  
   
   if (abs_usize < abs_vsize)  
     {  
       /* Swap U and V. */  
       MPZ_SRCPTR_SWAP (u, v);  
       MP_SIZE_T_SWAP (usize, vsize);  
       MP_SIZE_T_SWAP (abs_usize, abs_vsize);  
     }  
   
   /* True: ABS_USIZE >= ABS_VSIZE.  */  
   
   /* If not space for w (and possible carry), increase space.  */  
   wsize = abs_usize + 1;  
   if (w->_mp_alloc < wsize)  
     _mpz_realloc (w, wsize);  
   
   /* These must be after realloc (u or v may be the same as w).  */  
   up = u->_mp_d;  
   vp = v->_mp_d;  
   wp = w->_mp_d;  
   
   if ((usize ^ vsize) < 0)  
     {  
       /* U and V have different sign.  Need to compare them to determine  
          which operand to subtract from which.  */  
   
       /* This test is right since ABS_USIZE >= ABS_VSIZE.  */  
       if (abs_usize != abs_vsize)  
         {  
           mpn_sub (wp, up, abs_usize, vp, abs_vsize);  
           wsize = abs_usize;  
           MPN_NORMALIZE (wp, wsize);  
           if (usize < 0)  
             wsize = -wsize;  
         }  
       else if (mpn_cmp (up, vp, abs_usize) < 0)  
         {  
           mpn_sub_n (wp, vp, up, abs_usize);  
           wsize = abs_usize;  
           MPN_NORMALIZE (wp, wsize);  
           if (usize >= 0)  
             wsize = -wsize;  
         }  
       else  
         {  
           mpn_sub_n (wp, up, vp, abs_usize);  
           wsize = abs_usize;  
           MPN_NORMALIZE (wp, wsize);  
           if (usize < 0)  
             wsize = -wsize;  
         }  
     }  
   else  
     {  
       /* U and V have same sign.  Add them.  */  
       mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);  
       wp[abs_usize] = cy_limb;  
       wsize = abs_usize + cy_limb;  
       if (usize < 0)  
         wsize = -wsize;  
     }  
   
   w->_mp_size = wsize;  
 }  
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