OpenXM_contrib/gmp/mpfr/random.c - diff

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Diff for /OpenXM_contrib/gmp/mpfr/Attic/random.c between version 1.1 and 1.1.1.2

-version 1.1, 2000/09/09 14:12:19
+version 1.1.1.2, 2003/08/25 16:06:07
 Line 1
 Line 1
 Line 1
  /* 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.
  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.
  The MPFR Library 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 Library General Public
+ or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  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
  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
  #include "gmp-impl.h"
  #include "longlong.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
- #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;
-   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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