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-rw-r--r--math/w_pow_template.c51
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diff --git a/math/w_pow_template.c b/math/w_pow_template.c
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+/* Wrapper to set errno for pow.
+ Copyright (C) 2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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/>. */
+
+/* Only build wrappers from the templates for the types that define the macro
+ below. This macro is set in math-type-macros-<type>.h in sysdeps/generic
+ for each floating-point type. */
+#if __USE_WRAPPER_TEMPLATE
+
+# include <fenv.h>
+# include <math.h>
+# include <math_private.h>
+
+FLOAT
+M_DECL_FUNC (__pow) (FLOAT x, FLOAT y)
+{
+ FLOAT z = M_SUF (__ieee754_pow) (x, y);
+ if (__glibc_unlikely (!isfinite (z)))
+ {
+ if (isfinite (x) && isfinite (y))
+ {
+ if (isnan (z))
+ /* Domain error: pow(x<0,y=non-integer). */
+ __set_errno (EDOM);
+ else
+ /* Pole error: pow(x=0,y<0). Or overflow. */
+ __set_errno (ERANGE);
+ }
+ }
+ else if (__glibc_unlikely (z == 0) && isfinite (x) && x != 0 && isfinite (y))
+ /* Underflow. */
+ __set_errno (ERANGE);
+ return z;
+}
+declare_mgen_alias (__pow, pow)
+
+#endif /* __USE_WRAPPER_TEMPLATE. */