[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/math/s_catanf.c b/ap/libc/glibc/glibc-2.23/math/s_catanf.c
new file mode 100644
index 0000000..63e6b6e
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/math/s_catanf.c
@@ -0,0 +1,143 @@
+/* Return arc tangent of complex float value.
+ Copyright (C) 1997-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ 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 <complex.h>
+#include <math.h>
+#include <math_private.h>
+#include <float.h>
+
+__complex__ float
+__catanf (__complex__ float x)
+{
+ __complex__ float res;
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ if (__glibc_unlikely (rcls <= FP_INFINITE || icls <= FP_INFINITE))
+ {
+ if (rcls == FP_INFINITE)
+ {
+ __real__ res = __copysignf (M_PI_2, __real__ x);
+ __imag__ res = __copysignf (0.0, __imag__ x);
+ }
+ else if (icls == FP_INFINITE)
+ {
+ if (rcls >= FP_ZERO)
+ __real__ res = __copysignf (M_PI_2, __real__ x);
+ else
+ __real__ res = __nanf ("");
+ __imag__ res = __copysignf (0.0, __imag__ x);
+ }
+ else if (icls == FP_ZERO || icls == FP_INFINITE)
+ {
+ __real__ res = __nanf ("");
+ __imag__ res = __copysignf (0.0, __imag__ x);
+ }
+ else
+ {
+ __real__ res = __nanf ("");
+ __imag__ res = __nanf ("");
+ }
+ }
+ else if (__glibc_unlikely (rcls == FP_ZERO && icls == FP_ZERO))
+ {
+ res = x;
+ }
+ else
+ {
+ if (fabsf (__real__ x) >= 16.0f / FLT_EPSILON
+ || fabsf (__imag__ x) >= 16.0f / FLT_EPSILON)
+ {
+ __real__ res = __copysignf ((float) M_PI_2, __real__ x);
+ if (fabsf (__real__ x) <= 1.0f)
+ __imag__ res = 1.0f / __imag__ x;
+ else if (fabsf (__imag__ x) <= 1.0f)
+ __imag__ res = __imag__ x / __real__ x / __real__ x;
+ else
+ {
+ float h = __ieee754_hypotf (__real__ x / 2.0f,
+ __imag__ x / 2.0f);
+ __imag__ res = __imag__ x / h / h / 4.0f;
+ }
+ }
+ else
+ {
+ float den, absx, absy;
+
+ absx = fabsf (__real__ x);
+ absy = fabsf (__imag__ x);
+ if (absx < absy)
+ {
+ float t = absx;
+ absx = absy;
+ absy = t;
+ }
+
+ if (absy < FLT_EPSILON / 2.0f)
+ {
+ den = (1.0f - absx) * (1.0f + absx);
+ if (den == -0.0f)
+ den = 0.0f;
+ }
+ else if (absx >= 1.0f)
+ den = (1.0f - absx) * (1.0f + absx) - absy * absy;
+ else if (absx >= 0.75f || absy >= 0.5f)
+ den = -__x2y2m1f (absx, absy);
+ else
+ den = (1.0f - absx) * (1.0f + absx) - absy * absy;
+
+ __real__ res = 0.5f * __ieee754_atan2f (2.0f * __real__ x, den);
+
+ if (fabsf (__imag__ x) == 1.0f
+ && fabsf (__real__ x) < FLT_EPSILON * FLT_EPSILON)
+ __imag__ res = (__copysignf (0.5f, __imag__ x)
+ * ((float) M_LN2
+ - __ieee754_logf (fabsf (__real__ x))));
+ else
+ {
+ float r2 = 0.0f, num, f;
+
+ if (fabsf (__real__ x) >= FLT_EPSILON * FLT_EPSILON)
+ r2 = __real__ x * __real__ x;
+
+ num = __imag__ x + 1.0f;
+ num = r2 + num * num;
+
+ den = __imag__ x - 1.0f;
+ den = r2 + den * den;
+
+ f = num / den;
+ if (f < 0.5f)
+ __imag__ res = 0.25f * __ieee754_logf (f);
+ else
+ {
+ num = 4.0f * __imag__ x;
+ __imag__ res = 0.25f * __log1pf (num / den);
+ }
+ }
+ }
+
+ math_check_force_underflow_complex (res);
+ }
+
+ return res;
+}
+#ifndef __catanf
+weak_alias (__catanf, catanf)
+#endif