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-rw-r--r--libm/w_atan2.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/libm/w_atan2.c b/libm/w_atan2.c
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+++ b/libm/w_atan2.c
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+/* Copyright (C) 2011-2016 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/>. */
+
+/*
+ * wrapper atan2(y,x)
+ */
+
+#include <math.h>
+#include "math_private.h"
+#if __UCLIBC_HAS_FENV__
+#include <errno.h>
+#endif
+
+double
+atan2 (double y, double x)
+{
+#if __UCLIBC_HAS_FENV__
+ double z;
+
+ if (__builtin_expect (x == 0.0 && y == 0.0, 0) && _LIB_VERSION == _SVID_)
+ return __kernel_standard (y, x, 3); /* atan2(+-0,+-0) */
+
+ z = __ieee754_atan2 (y, x);
+ if (__builtin_expect (z == 0.0 && y != 0.0 && isfinite (x),0))
+ __set_errno (ERANGE);
+ return z;
+#else
+ return __ieee754_atan2 (y, x);
+#endif
+}
+libm_hidden_def(atan2) \ No newline at end of file