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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-01-30 10:36:17 +0100
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-01-30 16:06:59 +0100
commit12a85731dc5fda3bc01ab19c82678b3bf122d794 (patch)
tree36f8efa23c1847a07301e9a67f16e7050ba370cd /libm/e_exp10.c
parente6acefa2ddd445e7e13aa89ced6d184a08ad8da6 (diff)
add exp10() from glibc
Some software make use of exp10, so add it. Basic testing with LTP. Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libm/e_exp10.c')
-rw-r--r--libm/e_exp10.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/libm/e_exp10.c b/libm/e_exp10.c
new file mode 100644
index 000000000..f0ee87809
--- /dev/null
+++ b/libm/e_exp10.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 1998-2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+ The GNU C 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 GNU C 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 C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include "math.h"
+#include "math_private.h"
+#include <float.h>
+
+double __ieee754_exp10 (double arg)
+{
+ if (isfinite (arg) && arg < DBL_MIN_10_EXP - DBL_DIG - 10)
+ return DBL_MIN * DBL_MIN;
+ else
+ /* This is a very stupid and inprecise implementation. It'll get
+ replaced sometime (soon?). */
+ return __ieee754_exp (M_LN10 * arg);
+}
+strong_alias(__ieee754_exp10, exp10)
+libm_hidden_def(exp10)