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 logbf = __logbf
  31 
  32 #include "libm.h"
  33 #include "xpg6.h"       /* __xpg6 */
  34 #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  35 
  36 #if defined(__x86)
  37 static const float two25 = 33554432.0F;
  38 #else
  39 /*
  40  * v: a non-zero subnormal |x|
  41  */
  42 static int
  43 ilogbf_subnormal(unsigned v) {
  44         int r = -126 - 23;
  45 
  46         if (v & 0xffff0000)
  47                 r += 16, v >>= 16;
  48         if (v & 0xff00)
  49                 r += 8, v >>= 8;
  50         if (v & 0xf0)

  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 __logbf = logbf
  31 
  32 #include "libm.h"
  33 #include "xpg6.h"       /* __xpg6 */
  34 #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  35 
  36 #if defined(__x86)
  37 static const float two25 = 33554432.0F;
  38 #else
  39 /*
  40  * v: a non-zero subnormal |x|
  41  */
  42 static int
  43 ilogbf_subnormal(unsigned v) {
  44         int r = -126 - 23;
  45 
  46         if (v & 0xffff0000)
  47                 r += 16, v >>= 16;
  48         if (v & 0xff00)
  49                 r += 8, v >>= 8;
  50         if (v & 0xf0)