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author | pelissip <pelissip@280ebfd0-de03-0410-8827-d642c229c3f4> | 2003-11-05 09:00:03 +0000 |
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committer | pelissip <pelissip@280ebfd0-de03-0410-8827-d642c229c3f4> | 2003-11-05 09:00:03 +0000 |
commit | c1ff1a575e238532d7329dd5ebb15f5f48581868 (patch) | |
tree | acffa24515dd52bde31d602617354cc5a7682160 /sgn.c | |
parent | bc3b76bc225273a3d94929207a38d0b4ed43a4f5 (diff) | |
download | mpfr-c1ff1a575e238532d7329dd5ebb15f5f48581868.tar.gz |
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
Diffstat (limited to 'sgn.c')
-rw-r--r-- | sgn.c | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -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); +} |