blob: d3eff6b04b5abc8f04920babef77667967b75a7e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* IEEE754 floating point arithmetic
2 * single precision
3 */
4/*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 * http://www.algor.co.uk
8 *
9 * ########################################################################
10 *
11 * This program is free software; you can distribute it and/or modify it
12 * under the terms of the GNU General Public License (Version 2) as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 *
24 * ########################################################################
25 */
26
27
28#include "ieee754sp.h"
29
30int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cmp, int sig)
31{
32 COMPXSP;
33 COMPYSP;
34
35 EXPLODEXSP;
36 EXPLODEYSP;
37 FLUSHXSP;
38 FLUSHYSP;
39 CLEARCX; /* Even clear inexact flag here */
40
41 if (ieee754sp_isnan(x) || ieee754sp_isnan(y)) {
42 if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
43 SETCX(IEEE754_INVALID_OPERATION);
44 if (cmp & IEEE754_CUN)
45 return 1;
46 if (cmp & (IEEE754_CLT | IEEE754_CGT)) {
47 if (sig && SETANDTESTCX(IEEE754_INVALID_OPERATION))
48 return ieee754si_xcpt(0, "fcmpf", x);
49 }
50 return 0;
51 } else {
52 int vx = x.bits;
53 int vy = y.bits;
54
55 if (vx < 0)
56 vx = -vx ^ SP_SIGN_BIT;
57 if (vy < 0)
58 vy = -vy ^ SP_SIGN_BIT;
59
60 if (vx < vy)
61 return (cmp & IEEE754_CLT) != 0;
62 else if (vx == vy)
63 return (cmp & IEEE754_CEQ) != 0;
64 else
65 return (cmp & IEEE754_CGT) != 0;
66 }
67}