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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
29 static inline void ieee754_clearcx(void)
30 {
31         ieee754_csr.cx = 0;
32 }
33
34 static inline void ieee754_setcx(const unsigned int flags)
35 {
36         ieee754_csr.cx |= flags;
37         ieee754_csr.sx |= flags;
38 }
39
40 static inline int ieee754_setandtestcx(const unsigned int x)
41 {
42         ieee754_setcx(x);
43
44         return ieee754_csr.mx & x;
45 }
46
47 static 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  */