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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #pragma weak coshl = __coshl
  31 
  32 #include "libm.h"
  33 #include "longdouble.h"
  34 
  35 
  36 /*
  37  * coshl(X)
  38  * RETURN THE HYPERBOLIC COSINE OF X
  39  *
  40  * Method :
  41  *      1. Replace x by |x| (coshl(x) = coshl(-x)).
  42  *      2.
  43  *                                                     [ expl(x) - 1 ]^2
  44  *          0        <= x <= 0.3465 : coshl(x) := 1 + -------------------
  45  *                                                          2*expl(x)
  46  *
  47  *                                                expl(x) + 1/expl(x)
  48  *          0.3465   <= x <= thresh : coshl(x) := -------------------
  49  *                                                         2
  50  *          thresh   <= x <= lnovft : coshl(x) := expl(x)/2

  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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #pragma weak __coshl = coshl
  31 
  32 #include "libm.h"
  33 #include "longdouble.h"
  34 
  35 
  36 /*
  37  * coshl(X)
  38  * RETURN THE HYPERBOLIC COSINE OF X
  39  *
  40  * Method :
  41  *      1. Replace x by |x| (coshl(x) = coshl(-x)).
  42  *      2.
  43  *                                                     [ expl(x) - 1 ]^2
  44  *          0        <= x <= 0.3465 : coshl(x) := 1 + -------------------
  45  *                                                          2*expl(x)
  46  *
  47  *                                                expl(x) + 1/expl(x)
  48  *          0.3465   <= x <= thresh : coshl(x) := -------------------
  49  *                                                         2
  50  *          thresh   <= x <= lnovft : coshl(x) := expl(x)/2