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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 * ########################################################################
10 *
11 * This program is free software; you can distribute it and/or modify it
12 * under the terms of the GNU General Public License (Version 2) as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 *
24 * ########################################################################
25 */
26
27
28 #include "ieee754.h"
29
30 #define DP_EBIAS 1023
31 #define DP_EMIN (-1022)
32 #define DP_EMAX 1023
33 #define DP_MBITS 52
34
35 #define SP_EBIAS 127
36 #define SP_EMIN (-126)
37 #define SP_EMAX 127
38 #define SP_MBITS 23
39
40 #define DP_MBIT(x) ((u64)1 << (x))
41 #define DP_HIDDEN_BIT DP_MBIT(DP_MBITS)
42 #define DP_SIGN_BIT DP_MBIT(63)
43
44 #define SP_MBIT(x) ((u32)1 << (x))
45 #define SP_HIDDEN_BIT SP_MBIT(SP_MBITS)
46 #define SP_SIGN_BIT SP_MBIT(31)
47
48
49 #define SPSIGN(sp) (sp.parts.sign)
50 #define SPBEXP(sp) (sp.parts.bexp)
51 #define SPMANT(sp) (sp.parts.mant)
52
53 #define DPSIGN(dp) (dp.parts.sign)
54 #define DPBEXP(dp) (dp.parts.bexp)
55 #define DPMANT(dp) (dp.parts.mant)
56
57 #define CLPAIR(x, y) ((x)*6+(y))
58
59 #define CLEARCX \
60 (ieee754_csr.cx = 0)
61
62 #define SETCX(x) \
63 (ieee754_csr.cx |= (x), ieee754_csr.sx |= (x))
64
65 #define SETANDTESTCX(x) \
66 (SETCX(x), ieee754_csr.mx & (x))
67
68 #define TSTX() \
69 (ieee754_csr.cx & ieee754_csr.mx)
70
71
72 #define COMPXSP \
73 unsigned xm; int xe; int xs; int xc
74
75 #define COMPYSP \
76 unsigned ym; int ye; int ys; int yc
77
78 #define EXPLODESP(v, vc, vs, ve, vm) \
79 {\
80 vs = SPSIGN(v);\
81 ve = SPBEXP(v);\
82 vm = SPMANT(v);\
83 if(ve == SP_EMAX+1+SP_EBIAS){\
84 if(vm == 0)\
85 vc = IEEE754_CLASS_INF;\
86 else if(vm & SP_MBIT(SP_MBITS-1)) \
87 vc = IEEE754_CLASS_SNAN;\
88 else \
89 vc = IEEE754_CLASS_QNAN;\
90 } else if(ve == SP_EMIN-1+SP_EBIAS) {\
91 if(vm) {\
92 ve = SP_EMIN;\
93 vc = IEEE754_CLASS_DNORM;\
94 } else\
95 vc = IEEE754_CLASS_ZERO;\
96 } else {\
97 ve -= SP_EBIAS;\
98 vm |= SP_HIDDEN_BIT;\
99 vc = IEEE754_CLASS_NORM;\
100 }\
101 }
102 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
103 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
104
105
106 #define COMPXDP \
107 u64 xm; int xe; int xs; int xc
108
109 #define COMPYDP \
110 u64 ym; int ye; int ys; int yc
111
112 #define EXPLODEDP(v, vc, vs, ve, vm) \
113 {\
114 vm = DPMANT(v);\
115 vs = DPSIGN(v);\
116 ve = DPBEXP(v);\
117 if(ve == DP_EMAX+1+DP_EBIAS){\
118 if(vm == 0)\
119 vc = IEEE754_CLASS_INF;\
120 else if(vm & DP_MBIT(DP_MBITS-1)) \
121 vc = IEEE754_CLASS_SNAN;\
122 else \
123 vc = IEEE754_CLASS_QNAN;\
124 } else if(ve == DP_EMIN-1+DP_EBIAS) {\
125 if(vm) {\
126 ve = DP_EMIN;\
127 vc = IEEE754_CLASS_DNORM;\
128 } else\
129 vc = IEEE754_CLASS_ZERO;\
130 } else {\
131 ve -= DP_EBIAS;\
132 vm |= DP_HIDDEN_BIT;\
133 vc = IEEE754_CLASS_NORM;\
134 }\
135 }
136 #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
137 #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
138
139 #define FLUSHDP(v, vc, vs, ve, vm) \
140 if(vc==IEEE754_CLASS_DNORM) {\
141 if(ieee754_csr.nod) {\
142 SETCX(IEEE754_INEXACT);\
143 vc = IEEE754_CLASS_ZERO;\
144 ve = DP_EMIN-1+DP_EBIAS;\
145 vm = 0;\
146 v = ieee754dp_zero(vs);\
147 }\
148 }
149
150 #define FLUSHSP(v, vc, vs, ve, vm) \
151 if(vc==IEEE754_CLASS_DNORM) {\
152 if(ieee754_csr.nod) {\
153 SETCX(IEEE754_INEXACT);\
154 vc = IEEE754_CLASS_ZERO;\
155 ve = SP_EMIN-1+SP_EBIAS;\
156 vm = 0;\
157 v = ieee754sp_zero(vs);\
158 }\
159 }
160
161 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
162 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
163 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
164 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)