1/* ieee754 floating point arithmetic
2 * single and double precision
3 *
4 * BUGS
5 * not much dp done
6 * doesn't generate IEEE754_INEXACT
7 *
8 */
9/*
10 * MIPS floating point support
11 * Copyright (C) 1994-2000 Algorithmics Ltd.
12 * http://www.algor.co.uk
13 *
14 * ########################################################################
15 *
16 *  This program is free software; you can distribute it and/or modify it
17 *  under the terms of the GNU General Public License (Version 2) as
18 *  published by the Free Software Foundation.
19 *
20 *  This program is distributed in the hope it will be useful, but WITHOUT
21 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
23 *  for more details.
24 *
25 *  You should have received a copy of the GNU General Public License along
26 *  with this program; if not, write to the Free Software Foundation, Inc.,
27 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
28 *
29 * ########################################################################
30 */
31
32
33#include "ieee754int.h"
34#include "ieee754sp.h"
35#include "ieee754dp.h"
36
37#define DP_EBIAS	1023
38#define DP_EMIN		(-1022)
39#define DP_EMAX		1023
40
41#define SP_EBIAS	127
42#define SP_EMIN		(-126)
43#define SP_EMAX		127
44
45/* special constants
46*/
47
48
49#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
50#define SPSTR(s,b,m) {m,b,s}
51#define DPSTR(s,b,mh,ml) {ml,mh,b,s}
52#endif
53
54#ifdef __MIPSEB__
55#define SPSTR(s,b,m) {s,b,m}
56#define DPSTR(s,b,mh,ml) {s,b,mh,ml}
57#endif
58
59const struct ieee754dp_konst __ieee754dp_spcvals[] = {
60	DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0),	/* + zero   */
61	DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0),	/* - zero   */
62	DPSTR(0, DP_EBIAS, 0, 0),	/* + 1.0   */
63	DPSTR(1, DP_EBIAS, 0, 0),	/* - 1.0   */
64	DPSTR(0, 3 + DP_EBIAS, 0x40000, 0),	/* + 10.0   */
65	DPSTR(1, 3 + DP_EBIAS, 0x40000, 0),	/* - 10.0   */
66	DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0),	/* + infinity */
67	DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0),	/* - infinity */
68	DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */
69	DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF),	/* + max */
70	DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF),	/* - max */
71	DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0),	/* + min normal */
72	DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0),	/* - min normal */
73	DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1),	/* + min denormal */
74	DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1),	/* - min denormal */
75	DPSTR(0, 31 + DP_EBIAS, 0, 0),	/* + 1.0e31 */
76	DPSTR(0, 63 + DP_EBIAS, 0, 0),	/* + 1.0e63 */
77};
78
79const struct ieee754sp_konst __ieee754sp_spcvals[] = {
80	SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0),	/* + zero   */
81	SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0),	/* - zero   */
82	SPSTR(0, SP_EBIAS, 0),	/* + 1.0   */
83	SPSTR(1, SP_EBIAS, 0),	/* - 1.0   */
84	SPSTR(0, 3 + SP_EBIAS, 0x200000),	/* + 10.0   */
85	SPSTR(1, 3 + SP_EBIAS, 0x200000),	/* - 10.0   */
86	SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0),	/* + infinity */
87	SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0),	/* - infinity */
88	SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF),     /* + indef quiet Nan  */
89	SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF),	/* + max normal */
90	SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF),	/* - max normal */
91	SPSTR(0, SP_EMIN + SP_EBIAS, 0),	/* + min normal */
92	SPSTR(1, SP_EMIN + SP_EBIAS, 0),	/* - min normal */
93	SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1),	/* + min denormal */
94	SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1),	/* - min denormal */
95	SPSTR(0, 31 + SP_EBIAS, 0),	/* + 1.0e31 */
96	SPSTR(0, 63 + SP_EBIAS, 0),	/* + 1.0e63 */
97};
98
99
100int ieee754si_xcpt(int r, const char *op, ...)
101{
102	struct ieee754xctx ax;
103
104	if (!TSTX())
105		return r;
106	ax.op = op;
107	ax.rt = IEEE754_RT_SI;
108	ax.rv.si = r;
109	va_start(ax.ap, op);
110	ieee754_xcpt(&ax);
111	return ax.rv.si;
112}
113
114s64 ieee754di_xcpt(s64 r, const char *op, ...)
115{
116	struct ieee754xctx ax;
117
118	if (!TSTX())
119		return r;
120	ax.op = op;
121	ax.rt = IEEE754_RT_DI;
122	ax.rv.di = r;
123	va_start(ax.ap, op);
124	ieee754_xcpt(&ax);
125	return ax.rv.di;
126}
127