[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/math/s_csqrtl.c b/ap/libc/glibc/glibc-2.23/math/s_csqrtl.c
new file mode 100644
index 0000000..b0b52a5
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/math/s_csqrtl.c
@@ -0,0 +1,161 @@
+/* Complex square root of long double value.
+ Copyright (C) 1997-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>.
+ 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__ long double
+__csqrtl (__complex__ long double x)
+{
+ __complex__ long double res;
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ if (__glibc_unlikely (rcls <= FP_INFINITE || icls <= FP_INFINITE))
+ {
+ if (icls == FP_INFINITE)
+ {
+ __real__ res = HUGE_VALL;
+ __imag__ res = __imag__ x;
+ }
+ else if (rcls == FP_INFINITE)
+ {
+ if (__real__ x < 0.0)
+ {
+ __real__ res = icls == FP_NAN ? __nanl ("") : 0;
+ __imag__ res = __copysignl (HUGE_VALL, __imag__ x);
+ }
+ else
+ {
+ __real__ res = __real__ x;
+ __imag__ res = (icls == FP_NAN
+ ? __nanl ("") : __copysignl (0.0, __imag__ x));
+ }
+ }
+ else
+ {
+ __real__ res = __nanl ("");
+ __imag__ res = __nanl ("");
+ }
+ }
+ else
+ {
+ if (__glibc_unlikely (icls == FP_ZERO))
+ {
+ if (__real__ x < 0.0)
+ {
+ __real__ res = 0.0;
+ __imag__ res = __copysignl (__ieee754_sqrtl (-__real__ x),
+ __imag__ x);
+ }
+ else
+ {
+ __real__ res = fabsl (__ieee754_sqrtl (__real__ x));
+ __imag__ res = __copysignl (0.0, __imag__ x);
+ }
+ }
+ else if (__glibc_unlikely (rcls == FP_ZERO))
+ {
+ long double r;
+ if (fabsl (__imag__ x) >= 2.0L * LDBL_MIN)
+ r = __ieee754_sqrtl (0.5L * fabsl (__imag__ x));
+ else
+ r = 0.5L * __ieee754_sqrtl (2.0L * fabsl (__imag__ x));
+
+ __real__ res = r;
+ __imag__ res = __copysignl (r, __imag__ x);
+ }
+ else
+ {
+ long double d, r, s;
+ int scale = 0;
+
+ if (fabsl (__real__ x) > LDBL_MAX / 4.0L)
+ {
+ scale = 1;
+ __real__ x = __scalbnl (__real__ x, -2 * scale);
+ __imag__ x = __scalbnl (__imag__ x, -2 * scale);
+ }
+ else if (fabsl (__imag__ x) > LDBL_MAX / 4.0L)
+ {
+ scale = 1;
+ if (fabsl (__real__ x) >= 4.0L * LDBL_MIN)
+ __real__ x = __scalbnl (__real__ x, -2 * scale);
+ else
+ __real__ x = 0.0L;
+ __imag__ x = __scalbnl (__imag__ x, -2 * scale);
+ }
+ else if (fabsl (__real__ x) < 2.0L * LDBL_MIN
+ && fabsl (__imag__ x) < 2.0L * LDBL_MIN)
+ {
+ scale = -((LDBL_MANT_DIG + 1) / 2);
+ __real__ x = __scalbnl (__real__ x, -2 * scale);
+ __imag__ x = __scalbnl (__imag__ x, -2 * scale);
+ }
+
+ d = __ieee754_hypotl (__real__ x, __imag__ x);
+ /* Use the identity 2 Re res Im res = Im x
+ to avoid cancellation error in d +/- Re x. */
+ if (__real__ x > 0)
+ {
+ r = __ieee754_sqrtl (0.5L * (d + __real__ x));
+ if (scale == 1 && fabsl (__imag__ x) < 1.0L)
+ {
+ /* Avoid possible intermediate underflow. */
+ s = __imag__ x / r;
+ r = __scalbnl (r, scale);
+ scale = 0;
+ }
+ else
+ s = 0.5L * (__imag__ x / r);
+ }
+ else
+ {
+ s = __ieee754_sqrtl (0.5L * (d - __real__ x));
+ if (scale == 1 && fabsl (__imag__ x) < 1.0L)
+ {
+ /* Avoid possible intermediate underflow. */
+ r = fabsl (__imag__ x / s);
+ s = __scalbnl (s, scale);
+ scale = 0;
+ }
+ else
+ r = fabsl (0.5L * (__imag__ x / s));
+ }
+
+ if (scale)
+ {
+ r = __scalbnl (r, scale);
+ s = __scalbnl (s, scale);
+ }
+
+ math_check_force_underflow (r);
+ math_check_force_underflow (s);
+
+ __real__ res = r;
+ __imag__ res = __copysignl (s, __imag__ x);
+ }
+ }
+
+ return res;
+}
+weak_alias (__csqrtl, csqrtl)