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Diff for /OpenXM_contrib/gmp/mpfr/Attic/random.c between version 1.1.1.1 and 1.1.1.2

version 1.1.1.1, 2000/09/09 14:12:19 version 1.1.1.2, 2003/08/25 16:06:07
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 /* mpfr_random -- generate a random floating-point number  /* mpfr_random -- generate a random floating-point number
   
 Copyright (C) 1999 PolKA project, Inria Lorraine and Loria  Copyright 1999, 2001 Free Software Foundation, Inc.
   
 This file is part of the MPFR Library.  This file is part of the MPFR Library.
   
 The MPFR Library is free software; you can redistribute it and/or modify  The MPFR Library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Library General Public License as published by  it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at your  the Free Software Foundation; either version 2.1 of the License, or (at your
 option) any later version.  option) any later version.
   
 The MPFR Library is distributed in the hope that it will be useful, but  The MPFR Library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 License for more details.  License for more details.
   
 You should have received a copy of the GNU Library General Public License  You should have received a copy of the GNU Lesser General Public License
 along with the MPFR Library; see the file COPYING.LIB.  If not, write to  along with the MPFR Library; see the file COPYING.LIB.  If not, write to
 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. */
Line 24  MA 02111-1307, USA. */
Line 24  MA 02111-1307, USA. */
 #include "gmp-impl.h"  #include "gmp-impl.h"
 #include "longlong.h"  #include "longlong.h"
 #include "mpfr.h"  #include "mpfr.h"
   #include "mpfr-impl.h"
   
 /* Computes a random mpfr in [0, 1[ with precision PREC */  /* Computes a random mpfr in [0, 1[ with precision MPFR_PREC */
   
 extern long random _PROTO((void));  
 extern int srandom _PROTO((unsigned int));  
   
 /* extracted from GNU mpf */  
 #if defined (__hpux) || defined (__alpha)  
 /* HPUX lacks random().  DEC OSF/1 1.2 random() returns a double.  */  
 #define random mrand48  
 #define srandom srand48  
 #endif  
   
 void  void
 #if __STDC__  mpfr_random (mpfr_ptr x)
 mpfr_random(mpfr_ptr x)  
 #else  
 mpfr_random(x)  
      mpfr_ptr x;  
 #endif  
 {  {
   mp_limb_t *xp; unsigned long xn, i, cnt, prec=PREC(x);    mp_limb_t *xp; unsigned long xn, cnt, prec = MPFR_PREC(x);
   
   xp = MANT(x);    MPFR_CLEAR_FLAGS(x);
     xp = MPFR_MANT(x);
   xn = (prec-1)/BITS_PER_MP_LIMB + 1;    xn = (prec-1)/BITS_PER_MP_LIMB + 1;
   
   for (i = 0; i < xn; i++)    mpn_random (xp, xn);
     {  
       /* random() c/sh/ould be replaced by a homemade random number generator.  
          Indeed, if on Linux random is a good RNG, this is definitely not  
          the case in most Un*xes. */  
       xp[i] = random();  
     }  
   
   count_leading_zeros(cnt, xp[xn - 1]);  
   if (cnt) mpn_lshift(xp, xp, xn, cnt);  
   EXP(x) = -cnt;  
   
   cnt = xn*BITS_PER_MP_LIMB - prec;    if (xp[xn - 1] == 0)
   /* cnt is the number of non significant bits in the low limb */      xp[xn - 1] = 1;
   xp[0] &= ~((((mp_limb_t)1)<<cnt) - 1);    /* since count_leading_zeros doesn't like zeroes */
 }  
   
 void    count_leading_zeros (cnt, xp[xn - 1]);
 mpfr_srandom(unsigned long seed)    if (cnt)
 {      mpn_lshift (xp, xp, xn, cnt);
   srandom(seed);    MPFR_EXP(x) = -cnt;
     if (MPFR_SIGN(x) < 0)
       MPFR_CHANGE_SIGN(x);
   
     cnt = xn * BITS_PER_MP_LIMB - prec;
     /* cnt is the number of non significant bits in the low limb */
     xp[0] &= ~((MP_LIMB_T_ONE << cnt) - MP_LIMB_T_ONE);
 }  }

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