New module 'truncf-ieee'.

* modules/truncf-ieee: New file.
* m4/truncf.m4 (gl_FUNC_TRUNCF): If gl_FUNC_TRUNCF_IEEE is also used,
test whether truncf works according to ISO C 99 with IEC 60559.
* m4/truncf-ieee.m4: New file.
* lib/math.in.h (truncf): Replace if REPLACE_TRUNCF is set.
* m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_TRUNCF.
* modules/math (Makefile.am): Substitute REPLACE_TRUNCF.
* modules/truncf-ieee-tests: New file.
* tests/test-truncf-ieee.c: New file, based on tests/test-truncf1.c.
* tests/test-truncf1.c (main): Remove signbit tests.
* modules/truncf-tests (Depends-on): Remove 'signbit'.
* doc/posix-functions/truncf.texi: Mention the new module.

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/test-truncf-ieee.c b/tests/test-truncf-ieee.c
new file mode 100644
index 0000000000..c5c779ae70
--- /dev/null
+++ b/tests/test-truncf-ieee.c
@@ -0,0 +1,32 @@
+/* Test of rounding towards zero.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include "minus-zero.h"
+#include "macros.h"
+
+int
+main ()
+{
+  /* Zero.  */
+  ASSERT (!signbit (truncf (0.0f)));
+  ASSERT (!!signbit (truncf (minus_zerof)) == !!signbit (minus_zerof));
+
+  return 0;
+}