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 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak exp2 = __exp2
  30 
  31 /* INDENT OFF */
  32 /*
  33  * exp2(x)
  34  * Code by K.C. Ng for SUN 4.0 libm.
  35  * Method :
  36  *      exp2(x) = 2**x = 2**((x-anint(x))+anint(x))
  37  *              = 2**anint(x)*2**(x-anint(x))
  38  *              = 2**anint(x)*exp((x-anint(x))*ln2)
  39  */
  40 /* INDENT ON */
  41 
  42 #include "libm.h"
  43 
  44 static const double C[] = {
  45         0.0,
  46         1.0,
  47         0.5,
  48         6.93147180559945286227e-01,
  49         1.0e300,

   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 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak __exp2 = exp2
  30 
  31 /* INDENT OFF */
  32 /*
  33  * exp2(x)
  34  * Code by K.C. Ng for SUN 4.0 libm.
  35  * Method :
  36  *      exp2(x) = 2**x = 2**((x-anint(x))+anint(x))
  37  *              = 2**anint(x)*2**(x-anint(x))
  38  *              = 2**anint(x)*exp((x-anint(x))*ln2)
  39  */
  40 /* INDENT ON */
  41 
  42 #include "libm.h"
  43 
  44 static const double C[] = {
  45         0.0,
  46         1.0,
  47         0.5,
  48         6.93147180559945286227e-01,
  49         1.0e300,