1
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
3
* ***** BEGIN LICENSE BLOCK *****
4
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
6
* The contents of this file are subject to the Mozilla Public License Version
7
* 1.1 (the "License"); you may not use this file except in compliance with
8
* the License. You may obtain a copy of the License at
9
* http://www.mozilla.org/MPL/
11
* Software distributed under the License is distributed on an "AS IS" basis,
12
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13
* for the specific language governing rights and limitations under the
16
* The Original Code is Mozilla Communicator client code, released
19
* The Initial Developer of the Original Code is
20
* Sun Microsystems, Inc.
21
* Portions created by the Initial Developer are Copyright (C) 1998
22
* the Initial Developer. All Rights Reserved.
26
* Alternatively, the contents of this file may be used under the terms of
27
* either of the GNU General Public License Version 2 or later (the "GPL"),
28
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29
* in which case the provisions of the GPL or the LGPL are applicable instead
30
* of those above. If you wish to allow use of your version of this file only
31
* under the terms of either the GPL or the LGPL, and not to allow others to
32
* use your version of this file under the terms of the MPL, indicate your
33
* decision by deleting the provisions above and replace them with the notice
34
* and other provisions required by the GPL or the LGPL. If you do not delete
35
* the provisions above, a recipient may use your version of this file under
36
* the terms of any one of the MPL, the GPL or the LGPL.
38
* ***** END LICENSE BLOCK ***** */
40
/* @(#)s_nextafter.c 1.3 95/01/18 */
42
* ====================================================
43
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
45
* Developed at SunSoft, a Sun Microsystems, Inc. business.
46
* Permission to use, copy, modify, and distribute this
47
* software is freely granted, provided that this notice
49
* ====================================================
54
* return the next machine floating-point number of x in the
62
double fd_nextafter(double x, double y)
64
double fd_nextafter(x,y)
73
hx = __HI(ux); /* high word of x */
74
lx = __LO(ux); /* low word of x */
75
hy = __HI(uy); /* high word of y */
76
ly = __LO(uy); /* low word of y */
77
ix = hx&0x7fffffff; /* |x| */
78
iy = hy&0x7fffffff; /* |y| */
80
if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */
81
((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */
83
if(x==y) return x; /* x=y, return x */
84
if((ix|lx)==0) { /* x == 0 */
86
__HI(ux) = hy&0x80000000; /* return +-minsubnormal */
90
if(y==x) return y; else return x; /* raise underflow flag */
92
if(hx>=0) { /* x > 0 */
93
if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
96
} else { /* x < y, x += ulp */
101
if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
104
} else { /* x > y, x += ulp */
110
if(hy>=0x7ff00000) return x+x; /* overflow */
111
if(hy<0x00100000) { /* underflow */
113
if(y!=x) { /* raise underflow flag */
115
__HI(uy) = hx; __LO(uy) = lx;
121
__HI(ux) = hx; __LO(ux) = lx;