New internal functions mpfr_setmin and mpfr_setmax.

New functions mpfr_nextabove, mpfr_nextbelow, mpfr_nexttoward.
Small fix in mpfr_sub_one_ulp.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2001 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 40 insertions, 0 deletions

diff --git a/setmin.c b/setmin.c
new file mode 100644
index 000000000..42eb30693
--- /dev/null
+++ b/setmin.c
@@ -0,0 +1,40 @@
+/* mpfr_setmin -- minimum representable floating-point number (raw version)
+
+Copyright 2002 Free Software Foundation.
+Contributed by the Spaces project, INRIA Lorraine.
+
+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 Lesser General Public License as published by
+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 Lesser General Public
+License for more details.
+
+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. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "mpfr.h"
+#include "mpfr-impl.h"
+
+/* Note: the flags are not cleared and the current sign is kept. */
+
+void mpfr_setmin (mpfr_ptr x)
+{
+  mp_size_t xn;
+  mp_limb_t *xp;
+
+  MPFR_EXP(x) = __mpfr_emin;
+  xn = (MPFR_PREC(x) - 1) / BITS_PER_MP_LIMB;
+  xp = MPFR_MANT(x);
+  xp[xn] = MPFR_LIMB_HIGHBIT;
+  MPN_ZERO(xp, xn);
+}