text: /*-
   * Copyright (c) 2005 Bruce D. Evans and Steven G. Kargl
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice unmodified, this list of conditions, and the following
   *    disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * Hyperbolic cosine of a complex argument.  See s_ccosh.c for details.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: soc2013/dpl/head/lib/msun/src/s_ccoshf.c 226879 2011-10-21 06:29:32Z das $");
  
  #include <complex.h>
  #include <math.h>
  
  #include "math_private.h"
  
  static const float huge = 0x1p127;
  
  float complex
  ccoshf(float complex z)
  {
  	float x, y, h;
  	int32_t hx, hy, ix, iy;
  
  	x = crealf(z);
  	y = cimagf(z);
  
  	GET_FLOAT_WORD(hx, x);
  	GET_FLOAT_WORD(hy, y);
  
  	ix = 0x7fffffff & hx;
  	iy = 0x7fffffff & hy;
  
  	if (ix < 0x7f800000 && iy < 0x7f800000) {
  		if (iy == 0)
  			return (cpackf(coshf(x), x * y));
  		if (ix < 0x41100000)	/* small x: normal case */
  			return (cpackf(coshf(x) * cosf(y), sinhf(x) * sinf(y)));
  
  		/* |x| >= 9, so cosh(x) ~= exp(|x|) */
  		if (ix < 0x42b17218) {
  			/* x < 88.7: expf(|x|) won't overflow */
  			h = expf(fabsf(x)) * 0.5f;
  			return (cpackf(h * cosf(y), copysignf(h, x) * sinf(y)));
  		} else if (ix < 0x4340b1e7) {
  			/* x < 192.7: scale to avoid overflow */
  			z = __ldexp_cexpf(cpackf(fabsf(x), y), -1);
  			return (cpackf(crealf(z), cimagf(z) * copysignf(1, x)));
  		} else {
  			/* x >= 192.7: the result always overflows */
  			h = huge * x;
  			return (cpackf(h * h * cosf(y), h * sinf(y)));
  		}
  	}
  
  	if (ix == 0 && iy >= 0x7f800000)
  		return (cpackf(y - y, copysignf(0, x * (y - y))));
  
  	if (iy == 0 && ix >= 0x7f800000) {
  		if ((hx & 0x7fffff) == 0)
  			return (cpackf(x * x, copysignf(0, x) * y));
  		return (cpackf(x * x, copysignf(0, (x + x) * y)));
  	}
  
  	if (ix < 0x7f800000 && iy >= 0x7f800000)
  		return (cpackf(y - y, x * (y - y)));
  
  	if (ix >= 0x7f800000 && (hx & 0x7fffff) == 0) {
  		if (iy >= 0x7f800000)
  			return (cpackf(x * x, x * (y - y)));
  		return (cpackf((x * x) * cosf(y), x * sinf(y)));
  	}
  
  	return (cpackf((x * x) * (y - y), (x + x) * (y - y)));
  }
  
  float complex
  ccosf(float complex z)
  {
  
  	return (ccoshf(cpackf(-cimagf(z), crealf(z))));
  }
  