Add a real function for mpfr_sgn (not a call to mpfr_cmp_ui_2exp).

Add a test for mpfr_sgn.
Change the proto of mpfr_add1 and mpfr_sub1 by removing the last arg.
Simplify the logic of the sign in mpfr_sub1.
Tiny speed up for cmp/set/sqrt.
mpfr-impl auto include all the needed local header files (gmp, gmp-impl, mpfr).


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2534 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 40 insertions, 0 deletions

diff --git a/sgn.c b/sgn.c
new file mode 100644
index 000000000..1c7cdcea0
--- /dev/null
+++ b/sgn.c
@@ -0,0 +1,40 @@
+/* mpfr_sgn -- Sign of a floating point number.
+
+Copyright 2003 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"
+
+int
+mpfr_sgn (mpfr_srcptr a)
+{
+  if (MPFR_UNLIKELY( MPFR_IS_SINGULAR(a) ))
+    {
+      /* Only infinite is signed */
+      if (MPFR_IS_INF(a))
+	return MPFR_INT_SIGN(a);
+      else
+	return 0;
+    }
+  return MPFR_INT_SIGN(a);
+}