1/*
2 * IEEE754 floating point
3 * common internal header file
4 */
5/*
6 * MIPS floating point support
7 * Copyright (C) 1994-2000 Algorithmics Ltd.
8 *
9 *  This program is free software; you can distribute it and/or modify it
10 *  under the terms of the GNU General Public License (Version 2) as
11 *  published by the Free Software Foundation.
12 *
13 *  This program is distributed in the hope it will be useful, but WITHOUT
14 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16 *  for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
21 */
22#ifndef __IEEE754INT_H
23#define __IEEE754INT_H
24
25#include "ieee754.h"
26
27#define CLPAIR(x, y)	((x)*6+(y))
28
29static inline void ieee754_clearcx(void)
30{
31	ieee754_csr.cx = 0;
32}
33
34static inline void ieee754_setcx(const unsigned int flags)
35{
36	ieee754_csr.cx |= flags;
37	ieee754_csr.sx |= flags;
38}
39
40static inline int ieee754_setandtestcx(const unsigned int x)
41{
42	ieee754_setcx(x);
43
44	return ieee754_csr.mx & x;
45}
46
47static inline int ieee754_class_nan(int xc)
48{
49	return xc >= IEEE754_CLASS_SNAN;
50}
51
52#define COMPXSP \
53	unsigned xm; int xe; int xs __maybe_unused; int xc
54
55#define COMPYSP \
56	unsigned ym; int ye; int ys; int yc
57
58#define EXPLODESP(v, vc, vs, ve, vm)					\
59{									\
60	vs = SPSIGN(v);							\
61	ve = SPBEXP(v);							\
62	vm = SPMANT(v);							\
63	if (ve == SP_EMAX+1+SP_EBIAS) {					\
64		if (vm == 0)						\
65			vc = IEEE754_CLASS_INF;				\
66		else if (vm & SP_MBIT(SP_FBITS-1))			\
67			vc = IEEE754_CLASS_SNAN;			\
68	else								\
69		vc = IEEE754_CLASS_QNAN;				\
70	} else if (ve == SP_EMIN-1+SP_EBIAS) {				\
71		if (vm) {						\
72			ve = SP_EMIN;					\
73			vc = IEEE754_CLASS_DNORM;			\
74		} else							\
75			vc = IEEE754_CLASS_ZERO;			\
76	} else {							\
77		ve -= SP_EBIAS;						\
78		vm |= SP_HIDDEN_BIT;					\
79		vc = IEEE754_CLASS_NORM;				\
80	}								\
81}
82#define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
83#define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
84
85
86#define COMPXDP \
87	u64 xm; int xe; int xs __maybe_unused; int xc
88
89#define COMPYDP \
90	u64 ym; int ye; int ys; int yc
91
92#define EXPLODEDP(v, vc, vs, ve, vm)					\
93{									\
94	vm = DPMANT(v);							\
95	vs = DPSIGN(v);							\
96	ve = DPBEXP(v);							\
97	if (ve == DP_EMAX+1+DP_EBIAS) {					\
98		if (vm == 0)						\
99			vc = IEEE754_CLASS_INF;				\
100		else if (vm & DP_MBIT(DP_FBITS-1))			\
101			vc = IEEE754_CLASS_SNAN;			\
102		else							\
103			vc = IEEE754_CLASS_QNAN;			\
104	} else if (ve == DP_EMIN-1+DP_EBIAS) {				\
105		if (vm) {						\
106			ve = DP_EMIN;					\
107			vc = IEEE754_CLASS_DNORM;			\
108	} else								\
109		vc = IEEE754_CLASS_ZERO;				\
110	} else {							\
111		ve -= DP_EBIAS;						\
112		vm |= DP_HIDDEN_BIT;					\
113		vc = IEEE754_CLASS_NORM;				\
114	}								\
115}
116#define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
117#define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
118
119#define FLUSHDP(v, vc, vs, ve, vm)					\
120	if (vc==IEEE754_CLASS_DNORM) {					\
121		if (ieee754_csr.nod) {					\
122			ieee754_setcx(IEEE754_INEXACT);			\
123			vc = IEEE754_CLASS_ZERO;			\
124			ve = DP_EMIN-1+DP_EBIAS;			\
125			vm = 0;						\
126			v = ieee754dp_zero(vs);				\
127		}							\
128	}
129
130#define FLUSHSP(v, vc, vs, ve, vm)					\
131	if (vc==IEEE754_CLASS_DNORM) {					\
132		if (ieee754_csr.nod) {					\
133			ieee754_setcx(IEEE754_INEXACT);			\
134			vc = IEEE754_CLASS_ZERO;			\
135			ve = SP_EMIN-1+SP_EBIAS;			\
136			vm = 0;						\
137			v = ieee754sp_zero(vs);				\
138		}							\
139	}
140
141#define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
142#define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
143#define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
144#define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
145
146#endif /* __IEEE754INT_H  */
147