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 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak acoshf = __acoshf
  30 
  31 #include "libm.h"
  32 
  33 static const float zero = 0.0f;
  34 
  35 float
  36 acoshf(float x) {
  37         int     hx;
  38 
  39         hx = *(int *)&x;
  40         if (hx < 0x3f800000 || hx > 0x7f800000)   /* x < 1 or x is nan */
  41                 return ((x * zero) / zero);
  42         return ((float)acosh((double)x));
  43 }

   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 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak __acoshf = acoshf
  30 
  31 #include "libm.h"
  32 
  33 static const float zero = 0.0f;
  34 
  35 float
  36 acoshf(float x) {
  37         int     hx;
  38 
  39         hx = *(int *)&x;
  40         if (hx < 0x3f800000 || hx > 0x7f800000)   /* x < 1 or x is nan */
  41                 return ((x * zero) / zero);
  42         return ((float)acosh((double)x));
  43 }