1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * IEEE754 floating point
4 * common internal header file
5 */
6 /*
7 * MIPS floating point support
8 * Copyright (C) 1994-2000 Algorithmics Ltd.
9 */
10 #ifndef __IEEE754INT_H
11 #define __IEEE754INT_H
12
13 #include "ieee754.h"
14
15 #define CLPAIR(x, y) ((x)*6+(y))
16
17 enum maddf_flags {
18 MADDF_NEGATE_PRODUCT = 1 << 0,
19 MADDF_NEGATE_ADDITION = 1 << 1,
20 };
21
22 static inline void ieee754_clearcx(void)
23 {
24 ieee754_csr.cx = 0;
25 }
26
27 static inline void ieee754_setcx(const unsigned int flags)
28 {
29 ieee754_csr.cx |= flags;
30 ieee754_csr.sx |= flags;
31 }
32
33 static inline int ieee754_setandtestcx(const unsigned int x)
34 {
35 ieee754_setcx(x);
36
37 return ieee754_csr.mx & x;
38 }
39
40 static inline int ieee754_class_nan(int xc)
41 {
42 return xc >= IEEE754_CLASS_SNAN;
43 }
44
45 #define COMPXSP \
46 unsigned int xm; int xe; int xs __maybe_unused; int xc
47
48 #define COMPYSP \
49 unsigned int ym; int ye; int ys; int yc
50
51 #define COMPZSP \
52 unsigned int zm; int ze; int zs; int zc
53
54 #define EXPLODESP(v, vc, vs, ve, vm) \
55 { \
56 vs = SPSIGN(v); \
57 ve = SPBEXP(v); \
58 vm = SPMANT(v); \
59 if (ve == SP_EMAX+1+SP_EBIAS) { \
60 if (vm == 0) \
61 vc = IEEE754_CLASS_INF; \
62 else if (ieee754_csr.nan2008 ^ !(vm & SP_MBIT(SP_FBITS - 1))) \
63 vc = IEEE754_CLASS_QNAN; \
64 else \
65 vc = IEEE754_CLASS_SNAN; \
66 } else if (ve == SP_EMIN-1+SP_EBIAS) { \
67 if (vm) { \
68 ve = SP_EMIN; \
69 vc = IEEE754_CLASS_DNORM; \
70 } else \
71 vc = IEEE754_CLASS_ZERO; \
72 } else { \
73 ve -= SP_EBIAS; \
74 vm |= SP_HIDDEN_BIT; \
75 vc = IEEE754_CLASS_NORM; \
76 } \
77 }
78 #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
79 #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
80 #define EXPLODEZSP EXPLODESP(z, zc, zs, ze, zm)
81
82
83 #define COMPXDP \
84 u64 xm; int xe; int xs __maybe_unused; int xc
85
86 #define COMPYDP \
87 u64 ym; int ye; int ys; int yc
88
89 #define COMPZDP \
90 u64 zm; int ze; int zs; int zc
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 (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \
101 vc = IEEE754_CLASS_QNAN; \
102 else \
103 vc = IEEE754_CLASS_SNAN; \
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 #define EXPLODEZDP EXPLODEDP(z, zc, zs, ze, zm)
119
120 #define FLUSHDP(v, vc, vs, ve, vm) \
121 if (vc==IEEE754_CLASS_DNORM) { \
122 if (ieee754_csr.nod) { \
123 ieee754_setcx(IEEE754_INEXACT); \
124 vc = IEEE754_CLASS_ZERO; \
125 ve = DP_EMIN-1+DP_EBIAS; \
126 vm = 0; \
127 v = ieee754dp_zero(vs); \
128 } \
129 }
130
131 #define FLUSHSP(v, vc, vs, ve, vm) \
132 if (vc==IEEE754_CLASS_DNORM) { \
133 if (ieee754_csr.nod) { \
134 ieee754_setcx(IEEE754_INEXACT); \
135 vc = IEEE754_CLASS_ZERO; \
136 ve = SP_EMIN-1+SP_EBIAS; \
137 vm = 0; \
138 v = ieee754sp_zero(vs); \
139 } \
140 }
141
142 #define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
143 #define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
144 #define FLUSHZDP FLUSHDP(z, zc, zs, ze, zm)
145 #define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
146 #define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
147 #define FLUSHZSP FLUSHSP(z, zc, zs, ze, zm)
148
149 #endif /* __IEEE754INT_H */
150
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