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1da177e4 LT |
1 | /* 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 | ||
30 | int 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 | } |