Compatibility with mpf. WARNING: THESE FUNCTIONS ARE UNTESTED IN THEIR PRESENT

FORM. THEY *DO* COMPILE HOWEVER.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@524 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 73 insertions, 0 deletions

diff --git a/random2.c b/random2.c
new file mode 100644
index 000000000..cd31df235
--- /dev/null
+++ b/random2.c
@@ -0,0 +1,73 @@
+/* mpf_random2 -- Generate a positive random mpf_t of specified size, with
+   long runs of consecutive ones and zeros in the binary representation.
+   Intended for testing of other MP routines.
+
+Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The GNU MP 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
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP 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. */
+
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+#include "mpfr.h"
+
+#if defined (__hpux) || defined (__alpha)  || defined (__svr4__) || defined (__SVR4)
+/* HPUX lacks random().  DEC OSF/1 1.2 random() returns a double.  */
+long mrand48 ();
+static inline long
+random ()
+{
+  return mrand48 ();
+}
+#else
+long random ();
+#endif
+
+void
+#if __STDC__
+mpfr_random2 (mpfr_ptr x, mp_size_t size, mp_exp_t exp)
+#else
+mpfr_random2 (x, size, exp)
+     mpfr_ptr x;
+     mp_size_t size;
+     mp_exp_t exp;
+#endif
+{
+  mp_size_t xn; unsigned long cnt; mp_ptr xp = MANT(x); 
+  mp_size_t prec = (PREC(x) - 1)/BITS_PER_MP_LIMB; 
+
+  xn = ABS (size);
+  if (xn != 0)
+    {
+      if (xn > prec + 1)
+	xn = prec + 1;
+
+      mpn_random2 (xp, xn);
+    }
+
+  if (exp != 0)
+    exp = random () % (2 * exp) - exp;
+
+  count_leading_zeros(cnt, xp[xn - 1]); 
+  if (cnt) mpn_lshift(xp, xp, xn, cnt); 
+  EXP(x) = exp-cnt; 
+  cnt = xn*BITS_PER_MP_LIMB - prec; 
+  /* cnt is the number of non significant bits in the low limb */
+  xp[0] &= ~((((mp_limb_t)1)<<cnt) - 1);
+}