1 /* IEEE754 floating point arithmetic
2 * single precision
3 */
4 /*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 *
8 * ########################################################################
9 *
10 * This program is free software; you can distribute it and/or modify it
11 * under the terms of the GNU General Public License (Version 2) as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * ########################################################################
24 */
25
26
27 #include "ieee754sp.h"
28
ieee754sp_finite(ieee754sp x)29 int ieee754sp_finite(ieee754sp x)
30 {
31 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
32 }
33
ieee754sp_copysign(ieee754sp x,ieee754sp y)34 ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y)
35 {
36 CLEARCX;
37 SPSIGN(x) = SPSIGN(y);
38 return x;
39 }
40
41
ieee754sp_neg(ieee754sp x)42 ieee754sp ieee754sp_neg(ieee754sp x)
43 {
44 COMPXSP;
45
46 EXPLODEXSP;
47 CLEARCX;
48 FLUSHXSP;
49
50 /*
51 * Invert the sign ALWAYS to prevent an endless recursion on
52 * pow() in libc.
53 */
54 /* quick fix up */
55 SPSIGN(x) ^= 1;
56
57 if (xc == IEEE754_CLASS_SNAN) {
58 ieee754sp y = ieee754sp_indef();
59 SETCX(IEEE754_INVALID_OPERATION);
60 SPSIGN(y) = SPSIGN(x);
61 return ieee754sp_nanxcpt(y, "neg");
62 }
63
64 return x;
65 }
66
67
ieee754sp_abs(ieee754sp x)68 ieee754sp ieee754sp_abs(ieee754sp x)
69 {
70 COMPXSP;
71
72 EXPLODEXSP;
73 CLEARCX;
74 FLUSHXSP;
75
76 /* Clear sign ALWAYS, irrespective of NaN */
77 SPSIGN(x) = 0;
78
79 if (xc == IEEE754_CLASS_SNAN) {
80 SETCX(IEEE754_INVALID_OPERATION);
81 return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
82 }
83
84 return x;
85 }
86