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