1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   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 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 
  26 /*
  27  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __isnanl = isnanl
  32 
  33 #include "libm.h"
  34 
  35 #if defined(__sparc)
  36 int
  37 isnanl(long double x)
  38 {
  39         int *px = (int *)&x;
  40 
  41         return ((px[0] & ~0x80000000) >= 0x7fff0000 && ((px[0] & ~0xffff0000) |
  42             px[1] | px[2] | px[3]) != 0);
  43 }
  44 #elif defined(__x86)
  45 int
  46 isnanl(long double x)
  47 {
  48         int *px = (int *)&x, t = px[2] & 0x7fff;
  49 
  50 #if defined(HANDLE_UNSUPPORTED)
  51         return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0 || t != 0 &&
  52             (px[1] & 0x80000000) == 0);
  53 #else
  54         return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
  55 #endif
  56 }
  57 #endif /* defined(__sparc) || defined(__x86) */