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 asinh = __asinh
  31 
  32 /* INDENT OFF */
  33 /*
  34  * asinh(x)
  35  * Method :
  36  *      Based on
  37  *              asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
  38  *      we have
  39  *      asinh(x) := x  if  1+x*x == 1,
  40  *               := sign(x)*(log(x)+ln2)) for large |x|, else
  41  *               := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x| > 2, else
  42  *               := sign(x)*log1p(|x|+x^2/(1+sqrt(1+x^2)))
  43  */
  44 /* INDENT ON */
  45 
  46 #include "libm_synonyms.h"      /* __asinh */
  47 #include "libm_macros.h"
  48 #include <math.h>
  49 
  50 static const double xxx[] = {
  51 /* one */       1.00000000000000000000e+00,     /* 3FF00000, 00000000 */
  52 /* ln2 */       6.93147180559945286227e-01,     /* 3FE62E42, FEFA39EF */
  53 /* huge */      1.00000000000000000000e+300
  54 };
  55 #define one     xxx[0]
  56 #define ln2     xxx[1]
  57 #define huge    xxx[2]
  58 
  59 double
  60 asinh(double x) {
  61         double t, w;
  62         int hx, ix;
  63 
  64         hx = ((int *) &x)[HIWORD];
  65         ix = hx & 0x7fffffff;
  66         if (ix >= 0x7ff00000)

  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 __asinh = asinh
  31 
  32 /* INDENT OFF */
  33 /*
  34  * asinh(x)
  35  * Method :
  36  *      Based on
  37  *              asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
  38  *      we have
  39  *      asinh(x) := x  if  1+x*x == 1,
  40  *               := sign(x)*(log(x)+ln2)) for large |x|, else
  41  *               := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x| > 2, else
  42  *               := sign(x)*log1p(|x|+x^2/(1+sqrt(1+x^2)))
  43  */
  44 /* INDENT ON */
  45 

  46 #include "libm_macros.h"
  47 #include <math.h>
  48 
  49 static const double xxx[] = {
  50 /* one */       1.00000000000000000000e+00,     /* 3FF00000, 00000000 */
  51 /* ln2 */       6.93147180559945286227e-01,     /* 3FE62E42, FEFA39EF */
  52 /* huge */      1.00000000000000000000e+300
  53 };
  54 #define one     xxx[0]
  55 #define ln2     xxx[1]
  56 #define huge    xxx[2]
  57 
  58 double
  59 asinh(double x) {
  60         double t, w;
  61         int hx, ix;
  62 
  63         hx = ((int *) &x)[HIWORD];
  64         ix = hx & 0x7fffffff;
  65         if (ix >= 0x7ff00000)