Imported gcc-4.4.3

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

diff --git a/gmp/mpf/urandomb.c b/gmp/mpf/urandomb.c
new file mode 100644 (file)
index 0000000..41a4bc3
--- /dev/null
+++ b/gmp/mpf/urandomb.c
@@ -0,0 +1,58 @@
+/* mpf_urandomb (rop, state, nbits) -- Generate a uniform pseudorandom
+   real number between 0 (inclusive) and 1 (exclusive) of size NBITS,
+   using STATE as the random state previously initialized by a call to
+   gmp_randinit().
+
+Copyright 1999, 2000, 2001, 2002  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_urandomb (mpf_t rop, gmp_randstate_t rstate, unsigned long int nbits)
+{
+  mp_ptr rp;
+  mp_size_t nlimbs;
+  mp_exp_t exp;
+  mp_size_t prec;
+
+  rp = PTR (rop);
+  nlimbs = BITS_TO_LIMBS (nbits);
+  prec = PREC (rop);
+
+  if (nlimbs > prec + 1 || nlimbs == 0)
+    {
+      nlimbs = prec + 1;
+      nbits = nlimbs * GMP_NUMB_BITS;
+    }
+
+  _gmp_rand (rp, rstate, nbits);
+
+  /* If nbits isn't a multiple of GMP_NUMB_BITS, shift up.  */
+  if (nbits % GMP_NUMB_BITS != 0)
+    mpn_lshift (rp, rp, nlimbs, GMP_NUMB_BITS - nbits % GMP_NUMB_BITS);
+
+  exp = 0;
+  while (nlimbs != 0 && rp[nlimbs - 1] == 0)
+    {
+      nlimbs--;
+      exp--;
+    }
+  EXP (rop) = exp;
+  SIZ (rop) = nlimbs;
+}