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 scalbn = __scalbn
  30 
  31 #include "libm.h"
  32 
  33 static const double
  34         one     = 1.0,
  35         huge    = 1.0e300,
  36         tiny    = 1.0e-300,
  37         twom54  = 5.5511151231257827021181583404541015625e-17;
  38 
  39 #if defined(__x86)
  40 static const double two52 = 4503599627370496.0;
  41 #else
  42 /*
  43  * Normalize non-zero subnormal x and return biased exponent of x in [-51,0]
  44  */
  45 static int
  46 ilogb_biased(unsigned *px) {
  47         int s = 52;
  48         unsigned v = px[HIWORD] & ~0x80000000, w = px[LOWORD], t = v;
  49 

   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 __scalbn = scalbn
  30 
  31 #include "libm.h"
  32 
  33 static const double
  34         one     = 1.0,
  35         huge    = 1.0e300,
  36         tiny    = 1.0e-300,
  37         twom54  = 5.5511151231257827021181583404541015625e-17;
  38 
  39 #if defined(__x86)
  40 static const double two52 = 4503599627370496.0;
  41 #else
  42 /*
  43  * Normalize non-zero subnormal x and return biased exponent of x in [-51,0]
  44  */
  45 static int
  46 ilogb_biased(unsigned *px) {
  47         int s = 52;
  48         unsigned v = px[HIWORD] & ~0x80000000, w = px[LOWORD], t = v;
  49