usr/src/lib/libm/common/LD/isnanl.c

   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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29
  30 #pragma weak __isnanl = isnanl
  31
  32 #include "libm.h"
  33
  34 #if defined(__sparc)
  35 int
  36 isnanl(long double x) {
  37         int *px = (int *) &x;
  38         return ((px[0] & ~0x80000000) >= 0x7fff0000 &&
  39                 ((px[0] & ~0xffff0000) | px[1] | px[2] | px[3]) != 0);
  40 }
  41 #elif defined(__x86)
  42 int
  43 isnanl(long double x) {
  44         int *px = (int *) &x, t = px[2] & 0x7fff;
  45 #if defined(HANDLE_UNSUPPORTED)
  46         return ((t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0) ||
  47                 (t != 0 && (px[1] & 0x80000000) == 0));
  48 #else
  49         return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
  50 #endif
  51 }
  52 #endif  /* defined(__sparc) || defined(__x86) */