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 #include "libm.h"
  31 
  32 #if defined(__sparc)
  33 int
  34 isinfl(long double x) {
  35         int *px = (int *) &x;
  36         return ((px[0] & ~0x80000000) == 0x7fff0000 && px[1] == 0 &&
  37                 px[2] == 0 && px[3] == 0);
  38 }
  39 
  40 int
  41 isnormall(long double x) {
  42         int *px = (int *) &x;
  43         return ((unsigned) ((px[0] & 0x7fff0000) - 0x10000) < 0x7ffe0000);
  44 }
  45 
  46 int
  47 issubnormall(long double x) {
  48         int *px = (int *) &x;
  49         px[0] &= ~0x80000000;
  50         return (px[0] < 0x00010000 && (px[0] | px[1] | px[2] | px[3]) != 0);
  51 }
  52 
  53 int
  54 iszerol(long double x) {
  55         int *px = (int *) &x;
  56         return (((px[0] & ~0x80000000) | px[1] | px[2] | px[3]) == 0);
  57 }
  58 
  59 int
  60 signbitl(long double x) {
  61         unsigned *px = (unsigned *) &x;
  62         return (px[0] >> 31);
  63 }
  64 #elif defined(__x86)
  65 int
  66 isinfl(long double x) {
  67         int *px = (int *) &x;
  68 #if defined(HANDLE_UNSUPPORTED)
  69         return ((px[2] & 0x7fff) == 0x7fff &&
  70                 ((px[1] ^ 0x80000000) | px[0]) == 0);
  71 #else
  72         return ((px[2] & 0x7fff) == 0x7fff &&
  73                 ((px[1] & ~0x80000000) | px[0]) == 0);
  74 #endif
  75 }
  76 
  77 int
  78 isnormall(long double x) {
  79         int *px = (int *) &x;
  80 #if defined(HANDLE_UNSUPPORTED)
  81         return ((unsigned) ((px[2] & 0x7fff) - 1) < 0x7ffe &&
  82                 (px[1] & 0x80000000) != 0);
  83 #else
  84         return ((unsigned) ((px[2] & 0x7fff) - 1) < 0x7ffe);
  85 #endif
  86 }
  87 
  88 int
  89 issubnormall(long double x) {
  90         int *px = (int *) &x;
  91         return ((px[2] & 0x7fff) == 0 && (px[0] | px[1]) != 0);
  92 }
  93 
  94 int
  95 iszerol(long double x) {
  96         int *px = (int *) &x;
  97         return (((px[2] & 0x7fff) | px[0] | px[1]) == 0);
  98 }
  99 
 100 int
 101 signbitl(long double x) {
 102         unsigned *px = (unsigned *) &x;
 103         return ((px[2] >> 15) & 1);
 104 }
 105 #endif  /* defined(__sparc) || defined(__x86) */