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-rw-r--r--libquadmath/math/cacoshq.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/libquadmath/math/cacoshq.c b/libquadmath/math/cacoshq.c
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+++ b/libquadmath/math/cacoshq.c
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+/* Return arc hyperbole cosine for __float128 value.
+ Copyright (C) 1997, 1998, 2006 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include "quadmath-imp.h"
+
+
+__complex128
+cacoshq (__complex128 x)
+{
+ __complex128 res;
+ int rcls = fpclassifyq (__real__ x);
+ int icls = fpclassifyq (__imag__ x);
+
+ if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
+ {
+ if (icls == QUADFP_INFINITE)
+ {
+ __real__ res = HUGE_VALQ;
+
+ if (rcls == QUADFP_NAN)
+ __imag__ res = nanq ("");
+ else
+ __imag__ res = copysignq ((rcls == QUADFP_INFINITE
+ ? (__real__ x < 0.0
+ ? M_PIq - M_PI_4q : M_PI_4q)
+ : M_PI_2q), __imag__ x);
+ }
+ else if (rcls == QUADFP_INFINITE)
+ {
+ __real__ res = HUGE_VALQ;
+
+ if (icls >= QUADFP_ZERO)
+ __imag__ res = copysignq (signbitq (__real__ x) ? M_PIq : 0.0,
+ __imag__ x);
+ else
+ __imag__ res = nanq ("");
+ }
+ else
+ {
+ __real__ res = nanq ("");
+ __imag__ res = nanq ("");
+ }
+ }
+ else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
+ {
+ __real__ res = 0.0;
+ __imag__ res = copysignq (M_PI_2q, __imag__ x);
+ }
+ else
+ {
+ __complex128 y;
+
+ __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0;
+ __imag__ y = 2.0 * __real__ x * __imag__ x;
+
+ y = csqrtq (y);
+
+ if (__real__ x < 0.0)
+ y = -y;
+
+ __real__ y += __real__ x;
+ __imag__ y += __imag__ x;
+
+ res = clogq (y);
+
+ /* We have to use the positive branch. */
+ if (__real__ res < 0.0)
+ res = -res;
+ }
+
+ return res;
+}