aboutsummaryrefslogtreecommitdiff
path: root/math/w_powl_compat.c
diff options
context:
space:
mode:
Diffstat (limited to 'math/w_powl_compat.c')
-rw-r--r--math/w_powl_compat.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/math/w_powl_compat.c b/math/w_powl_compat.c
new file mode 100644
index 0000000000..60a89c2b42
--- /dev/null
+++ b/math/w_powl_compat.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
+
+ 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>
+
+
+/* wrapper powl */
+long double
+__powl (long double x, long double y)
+{
+ long double z = __ieee754_powl (x, y);
+ if (__glibc_unlikely (!isfinite (z)))
+ {
+ if (_LIB_VERSION != _IEEE_)
+ {
+ if (isfinite (x) && isfinite (y))
+ {
+ if (isnan (z))
+ /* pow neg**non-int */
+ return __kernel_standard_l (x, y, 224);
+ else if (x == 0.0L && y < 0.0L)
+ {
+ if (signbit (x) && signbit (z))
+ /* pow(-0.0,negative) */
+ return __kernel_standard_l (x, y, 223);
+ else
+ /* pow(+0.0,negative) */
+ return __kernel_standard_l (x, y, 243);
+ }
+ else
+ /* pow overflow */
+ return __kernel_standard_l (x, y, 221);
+ }
+ }
+ }
+ else if (__builtin_expect (z == 0.0L, 0)
+ && isfinite (x) && x != 0 && isfinite (y)
+ && _LIB_VERSION != _IEEE_)
+ /* pow underflow */
+ return __kernel_standard_l (x, y, 222);
+
+ return z;
+}
+weak_alias (__powl, powl)