1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __coshf = coshf
  32 
  33 #include "libm.h"
  34 
  35 float
  36 coshf(float x)
  37 {
  38         double c;
  39         float w;
  40         int ix;
  41 
  42         ix = *(int *)&x & ~0x80000000;
  43 
  44         if (ix >= 0x7f800000) {
  45                 /* coshf(x) is |x| if x is +-Inf or NaN */
  46                 return (x * x);
  47         }
  48 
  49         if (ix >= 0x43000000)                /* coshf(x) trivially overflows */
  50                 c = 1.0e100;
  51         else
  52                 c = cosh((double)x);
  53 
  54         w = (float)c;
  55         return (w);
  56 }