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 #if defined(ELFOBJ)
  31 #pragma weak isinfl = __isinfl
  32 #pragma weak isnormall = __isnormall
  33 #pragma weak issubnormall = __issubnormall
  34 #pragma weak iszerol = __iszerol
  35 #pragma weak signbitl = __signbitl
  36 #endif
  37 
  38 #include "libm.h"
  39 
  40 #if defined(__sparc)
  41 int
  42 isinfl(long double x) {
  43         int *px = (int *) &x;
  44         return ((px[0] & ~0x80000000) == 0x7fff0000 && px[1] == 0 &&
  45                 px[2] == 0 && px[3] == 0);
  46 }
  47 
  48 int
  49 isnormall(long double x) {
  50         int *px = (int *) &x;
  51         return ((unsigned) ((px[0] & 0x7fff0000) - 0x10000) < 0x7ffe0000);
  52 }
  53 
  54 int
  55 issubnormall(long double x) {
  56         int *px = (int *) &x;
  57         px[0] &= ~0x80000000;
  58         return (px[0] < 0x00010000 && (px[0] | px[1] | px[2] | px[3]) != 0);
  59 }
  60 
  61 int
  62 iszerol(long double x) {
  63         int *px = (int *) &x;
  64         return (((px[0] & ~0x80000000) | px[1] | px[2] | px[3]) == 0);
  65 }
  66 
  67 int
  68 signbitl(long double x) {
  69         unsigned *px = (unsigned *) &x;
  70         return (px[0] >> 31);
  71 }
  72 #elif defined(__x86)
  73 int
  74 isinfl(long double x) {
  75         int *px = (int *) &x;
  76 #if defined(HANDLE_UNSUPPORTED)
  77         return ((px[2] & 0x7fff) == 0x7fff &&
  78                 ((px[1] ^ 0x80000000) | px[0]) == 0);
  79 #else
  80         return ((px[2] & 0x7fff) == 0x7fff &&
  81                 ((px[1] & ~0x80000000) | px[0]) == 0);
  82 #endif
  83 }
  84 
  85 int
  86 isnormall(long double x) {
  87         int *px = (int *) &x;
  88 #if defined(HANDLE_UNSUPPORTED)
  89         return ((unsigned) ((px[2] & 0x7fff) - 1) < 0x7ffe &&
  90                 (px[1] & 0x80000000) != 0);
  91 #else
  92         return ((unsigned) ((px[2] & 0x7fff) - 1) < 0x7ffe);
  93 #endif
  94 }
  95 
  96 int
  97 issubnormall(long double x) {
  98         int *px = (int *) &x;
  99         return ((px[2] & 0x7fff) == 0 && (px[0] | px[1]) != 0);
 100 }
 101 
 102 int
 103 iszerol(long double x) {
 104         int *px = (int *) &x;
 105         return (((px[2] & 0x7fff) | px[0] | px[1]) == 0);
 106 }
 107 
 108 int
 109 signbitl(long double x) {
 110         unsigned *px = (unsigned *) &x;
 111         return ((px[2] >> 15) & 1);
 112 }
 113 #endif  /* defined(__sparc) || defined(__x86) */