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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / arch / arm / nwfpe / double_cpdo.c
blob: c51d1386a97c9492786a0ec49ed7947be83d4a28 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]1/*
2 NetWinder Floating Point Emulator
3 (c) Rebel.COM, 1998,1999
4
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include "fpa11.h"
23#include "softfloat.h"
24#include "fpopcode.h"
25
26union float64_components {
27 float64 f64;
28 unsigned int i[2];
29};
30
31float64 float64_exp(float64 Fm);
32float64 float64_ln(float64 Fm);
33float64 float64_sin(float64 rFm);
34float64 float64_cos(float64 rFm);
35float64 float64_arcsin(float64 rFm);
36float64 float64_arctan(float64 rFm);
37float64 float64_log(float64 rFm);
38float64 float64_tan(float64 rFm);
39float64 float64_arccos(float64 rFm);
40float64 float64_pow(float64 rFn, float64 rFm);
41float64 float64_pol(float64 rFn, float64 rFm);
42
43static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
44{
45 return float64_sub(roundData, rFm, rFn);
46}
47
48static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
49{
50 return float64_div(roundData, rFm, rFn);
51}
52
53static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
54 [ADF_CODE >> 20] = float64_add,
55 [MUF_CODE >> 20] = float64_mul,
56 [SUF_CODE >> 20] = float64_sub,
57 [RSF_CODE >> 20] = float64_rsf,
58 [DVF_CODE >> 20] = float64_div,
59 [RDF_CODE >> 20] = float64_rdv,
60 [RMF_CODE >> 20] = float64_rem,
61
62 /* strictly, these opcodes should not be implemented */
63 [FML_CODE >> 20] = float64_mul,
64 [FDV_CODE >> 20] = float64_div,
65 [FRD_CODE >> 20] = float64_rdv,
66};
67
68static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
69{
70 return rFm;
71}
72
73static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
74{
75 union float64_components u;
76
77 u.f64 = rFm;
78#ifdef __ARMEB__
79 u.i[0] ^= 0x80000000;
80#else
81 u.i[1] ^= 0x80000000;
82#endif
83
84 return u.f64;
85}
86
87static float64 float64_abs(struct roundingData *roundData,float64 rFm)
88{
89 union float64_components u;
90
91 u.f64 = rFm;
92#ifdef __ARMEB__
93 u.i[0] &= 0x7fffffff;
94#else
95 u.i[1] &= 0x7fffffff;
96#endif
97
98 return u.f64;
99}
100
101static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
102 [MVF_CODE >> 20] = float64_mvf,
103 [MNF_CODE >> 20] = float64_mnf,
104 [ABS_CODE >> 20] = float64_abs,
105 [RND_CODE >> 20] = float64_round_to_int,
106 [URD_CODE >> 20] = float64_round_to_int,
107 [SQT_CODE >> 20] = float64_sqrt,
108 [NRM_CODE >> 20] = float64_mvf,
109};
110
111unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
112{
113 FPA11 *fpa11 = GET_FPA11();
114 float64 rFm;
115 unsigned int Fm, opc_mask_shift;
116
117 Fm = getFm(opcode);
118 if (CONSTANT_FM(opcode)) {
119 rFm = getDoubleConstant(Fm);
120 } else {
121 switch (fpa11->fType[Fm]) {
122 case typeSingle:
123 rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
124 break;
125
126 case typeDouble:
127 rFm = fpa11->fpreg[Fm].fDouble;
128 break;
129
130 default:
131 return 0;
132 }
133 }
134
135 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
136 if (!MONADIC_INSTRUCTION(opcode)) {
137 unsigned int Fn = getFn(opcode);
138 float64 rFn;
139
140 switch (fpa11->fType[Fn]) {
141 case typeSingle:
142 rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
143 break;
144
145 case typeDouble:
146 rFn = fpa11->fpreg[Fn].fDouble;
147 break;
148
149 default:
150 return 0;
151 }
152
153 if (dyadic_double[opc_mask_shift]) {
154 rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
155 } else {
156 return 0;
157 }
158 } else {
159 if (monadic_double[opc_mask_shift]) {
160 rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
161 } else {
162 return 0;
163 }
164 }
165
166 return 1;
167}