1 /* IEEE754 floating point arithmetic
2 * double precision: common utilities
3 */
4 /*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 *
8 * This program is free software; you can distribute it and/or modify it
9 * under the terms of the GNU General Public License (Version 2) as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22 #include "ieee754dp.h"
23
ieee754dp_cmp(union ieee754dp x,union ieee754dp y,int cmp,int sig)24 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cmp, int sig)
25 {
26 s64 vx;
27 s64 vy;
28
29 COMPXDP;
30 COMPYDP;
31
32 EXPLODEXDP;
33 EXPLODEYDP;
34 FLUSHXDP;
35 FLUSHYDP;
36 ieee754_clearcx(); /* Even clear inexact flag here */
37
38 if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) {
39 if (sig ||
40 xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
41 ieee754_setcx(IEEE754_INVALID_OPERATION);
42 return (cmp & IEEE754_CUN) != 0;
43 } else {
44 vx = x.bits;
45 vy = y.bits;
46
47 if (vx < 0)
48 vx = -vx ^ DP_SIGN_BIT;
49 if (vy < 0)
50 vy = -vy ^ DP_SIGN_BIT;
51
52 if (vx < vy)
53 return (cmp & IEEE754_CLT) != 0;
54 else if (vx == vy)
55 return (cmp & IEEE754_CEQ) != 0;
56 else
57 return (cmp & IEEE754_CGT) != 0;
58 }
59 }
60