1/* IEEE754 floating point arithmetic
2 * double precision: common utilities
3 */
4/*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.  All rights reserved.
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 "ieee754dp.h"
29
30int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cmp, int sig)
31{
32	COMPXDP;
33	COMPYDP;
34
35	EXPLODEXDP;
36	EXPLODEYDP;
37	FLUSHXDP;
38	FLUSHYDP;
39	CLEARCX;	/* Even clear inexact flag here */
40
41	if (ieee754dp_isnan(x) || ieee754dp_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		s64 vx = x.bits;
53		s64 vy = y.bits;
54
55		if (vx < 0)
56			vx = -vx ^ DP_SIGN_BIT;
57		if (vy < 0)
58			vy = -vy ^ DP_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}
68