aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/math-emu/sp_simple.c
blob: 633c7a54cf1e52faa48267183741a4773fcb7a7c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/* IEEE754 floating point arithmetic
 * single precision
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * ########################################################################
 */


#include "ieee754sp.h"

int ieee754sp_finite(union ieee754sp x)
{
	return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
}

union ieee754sp ieee754sp_copysign(union ieee754sp x, union ieee754sp y)
{
	CLEARCX;
	SPSIGN(x) = SPSIGN(y);
	return x;
}


union ieee754sp ieee754sp_neg(union ieee754sp x)
{
	COMPXSP;

	EXPLODEXSP;
	CLEARCX;
	FLUSHXSP;

	/*
	 * Invert the sign ALWAYS to prevent an endless recursion on
	 * pow() in libc.
	 */
	/* quick fix up */
	SPSIGN(x) ^= 1;

	if (xc == IEEE754_CLASS_SNAN) {
		union ieee754sp y = ieee754sp_indef();
		SETCX(IEEE754_INVALID_OPERATION);
		SPSIGN(y) = SPSIGN(x);
		return ieee754sp_nanxcpt(y, "neg");
	}

	return x;
}


union ieee754sp ieee754sp_abs(union ieee754sp x)
{
	COMPXSP;

	EXPLODEXSP;
	CLEARCX;
	FLUSHXSP;

	/* Clear sign ALWAYS, irrespective of NaN */
	SPSIGN(x) = 0;

	if (xc == IEEE754_CLASS_SNAN) {
		SETCX(IEEE754_INVALID_OPERATION);
		return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
	}

	return x;
}