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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak cosh = __cosh
  30 
  31 /* INDENT OFF */
  32 /*
  33  * cosh(x)
  34  * Code originated from 4.3bsd.
  35  * Modified by K.C. Ng for SUN 4.0 libm.
  36  * Method :
  37  *      1. Replace x by |x| (cosh(x) = cosh(-x)).
  38  *      2.
  39  *                                       [ exp(x) - 1 ]^2
  40  *  0        <= x <= 0.3465  :  cosh(x) := 1 + -------------------
  41  *                                                                    2*exp(x)
  42  *
  43  *                                                 exp(x) +  1/exp(x)
  44  *  0.3465   <= x <= 22      :  cosh(x) := -------------------
  45  *                                                                         2
  46  *  22       <= x <= lnovft  :  cosh(x) := exp(x)/2
  47  *  lnovft   <= x <  INF     :  cosh(x) := scalbn(exp(x-1024*ln2),1023)
  48  *
  49  *      Note: .3465 is a number near one half of ln2.

   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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak __cosh = cosh
  30 
  31 /* INDENT OFF */
  32 /*
  33  * cosh(x)
  34  * Code originated from 4.3bsd.
  35  * Modified by K.C. Ng for SUN 4.0 libm.
  36  * Method :
  37  *      1. Replace x by |x| (cosh(x) = cosh(-x)).
  38  *      2.
  39  *                                       [ exp(x) - 1 ]^2
  40  *  0        <= x <= 0.3465  :  cosh(x) := 1 + -------------------
  41  *                                                                    2*exp(x)
  42  *
  43  *                                                 exp(x) +  1/exp(x)
  44  *  0.3465   <= x <= 22      :  cosh(x) := -------------------
  45  *                                                                         2
  46  *  22       <= x <= lnovft  :  cosh(x) := exp(x)/2
  47  *  lnovft   <= x <  INF     :  cosh(x) := scalbn(exp(x-1024*ln2),1023)
  48  *
  49  *      Note: .3465 is a number near one half of ln2.