Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpf / random2.c

diff --git a/gmp/mpf/random2.c b/gmp/mpf/random2.c
new file mode 100644 (file)
index 0000000..d1bef10
--- /dev/null
+++ b/gmp/mpf/random2.c
@@ -0,0 +1,56 @@
+/* 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 1995, 1996, 2001, 2002, 2003 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 Lesser General Public License as published by
+the Free Software Foundation; either version 3 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+void
+mpf_random2 (mpf_ptr x, mp_size_t xs, mp_exp_t exp)
+{
+  mp_size_t xn;
+  mp_size_t prec;
+  mp_limb_t elimb;
+
+  xn = ABS (xs);
+  prec = PREC(x);
+
+  if (xn == 0)
+    {
+      EXP(x) = 0;
+      SIZ(x) = 0;
+      return;
+    }
+
+  if (xn > prec + 1)
+    xn = prec + 1;
+
+  /* General random mantissa.  */
+  mpn_random2 (PTR(x), xn);
+
+  /* Generate random exponent.  */
+  _gmp_rand (&elimb, RANDS, GMP_NUMB_BITS);
+  exp = ABS (exp);
+  exp = elimb % (2 * exp + 1) - exp;
+
+  EXP(x) = exp;
+  SIZ(x) = xs < 0 ? -xn : xn;
+}