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diff --git a/sysdeps/libm-ieee754/s_csinh.c b/sysdeps/libm-ieee754/s_csinh.c
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+/* Complex sine hyperbole function for double.
+ Copyright (C) 1997 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <complex.h>
+#include <math.h>
+
+
+__complex__ double
+__csinh (__complex__ double x)
+{
+ __complex__ double retval;
+ int negate = signbit (__real__ x);
+
+ __real__ x = fabs (__real__ x);
+
+ if (isfinite (__real__ x))
+ {
+ if (isfinite (__imag__ x))
+ {
+ double exp_val = __exp (__real__ x);
+ double rec_exp_val = 1.0 / exp_val;
+
+ __real__ retval = 0.5 * (exp_val - rec_exp_val) * __cos (__imag__ x);
+ __imag__ retval = 0.5 * (exp_val - rec_exp_val) * __sin (__imag__ x);
+
+ if (negate)
+ __real__ retval = -__real__ retval;
+ }
+ else
+ {
+ if (__real__ x == 0)
+ {
+ __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
+ __imag__ retval = __nan ("") + __nan ("");
+ }
+ else
+ {
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+ }
+ }
+ }
+ else if (__isinf (__real__ x))
+ {
+ if (__imag__ x == 0.0)
+ {
+ __real__ retval = negate ? -HUGE_VAL : HUGE_VAL;
+ __imag__ retval = __imag__ x;
+ }
+ else if (isfinite (__imag__ x))
+ {
+ __real__ retval = __copysign (HUGE_VAL, __cos (__imag__ x));
+ __imag__ retval = __copysign (HUGE_VAL, __sin (__imag__ x));
+
+ if (negate)
+ __real__ retval = -__real__ retval;
+ }
+ else
+ {
+ /* The addition raises the invalid exception. */
+ __real__ retval = HUGE_VAL;
+ __imag__ retval = __nan ("") + __nan ("");
+ }
+ }
+ else
+ {
+ if (__imag__ x == 0.0)
+ {
+ __real__ retval = __nan ("");
+ __imag__ retval = __imag__ x;
+ }
+ else
+ {
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+ }
+ }
+
+ return retval;
+}
+weak_alias (__csinh, csinh)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__csinh, __csinhl)
+weak_alias (__csinh, csinhl)
+#endif