1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 NetWinder Floating Point Emulator
4 (c) Rebel.COM, 1998,1999
5
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
8 */
9
10 #include "fpa11.h"
11 #include "softfloat.h"
12 #include "fpopcode.h"
13
14 floatx80 floatx80_exp(floatx80 Fm);
15 floatx80 floatx80_ln(floatx80 Fm);
16 floatx80 floatx80_sin(floatx80 rFm);
17 floatx80 floatx80_cos(floatx80 rFm);
18 floatx80 floatx80_arcsin(floatx80 rFm);
19 floatx80 floatx80_arctan(floatx80 rFm);
20 floatx80 floatx80_log(floatx80 rFm);
21 floatx80 floatx80_tan(floatx80 rFm);
22 floatx80 floatx80_arccos(floatx80 rFm);
23 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
24 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
25
floatx80_rsf(struct roundingData * roundData,floatx80 rFn,floatx80 rFm)26 static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
27 {
28 return floatx80_sub(roundData, rFm, rFn);
29 }
30
floatx80_rdv(struct roundingData * roundData,floatx80 rFn,floatx80 rFm)31 static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
32 {
33 return floatx80_div(roundData, rFm, rFn);
34 }
35
36 static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
37 [ADF_CODE >> 20] = floatx80_add,
38 [MUF_CODE >> 20] = floatx80_mul,
39 [SUF_CODE >> 20] = floatx80_sub,
40 [RSF_CODE >> 20] = floatx80_rsf,
41 [DVF_CODE >> 20] = floatx80_div,
42 [RDF_CODE >> 20] = floatx80_rdv,
43 [RMF_CODE >> 20] = floatx80_rem,
44
45 /* strictly, these opcodes should not be implemented */
46 [FML_CODE >> 20] = floatx80_mul,
47 [FDV_CODE >> 20] = floatx80_div,
48 [FRD_CODE >> 20] = floatx80_rdv,
49 };
50
floatx80_mvf(struct roundingData * roundData,floatx80 rFm)51 static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
52 {
53 return rFm;
54 }
55
floatx80_mnf(struct roundingData * roundData,floatx80 rFm)56 static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
57 {
58 rFm.high ^= 0x8000;
59 return rFm;
60 }
61
floatx80_abs(struct roundingData * roundData,floatx80 rFm)62 static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
63 {
64 rFm.high &= 0x7fff;
65 return rFm;
66 }
67
68 static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
69 [MVF_CODE >> 20] = floatx80_mvf,
70 [MNF_CODE >> 20] = floatx80_mnf,
71 [ABS_CODE >> 20] = floatx80_abs,
72 [RND_CODE >> 20] = floatx80_round_to_int,
73 [URD_CODE >> 20] = floatx80_round_to_int,
74 [SQT_CODE >> 20] = floatx80_sqrt,
75 [NRM_CODE >> 20] = floatx80_mvf,
76 };
77
ExtendedCPDO(struct roundingData * roundData,const unsigned int opcode,FPREG * rFd)78 unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
79 {
80 FPA11 *fpa11 = GET_FPA11();
81 floatx80 rFm;
82 unsigned int Fm, opc_mask_shift;
83
84 Fm = getFm(opcode);
85 if (CONSTANT_FM(opcode)) {
86 rFm = getExtendedConstant(Fm);
87 } else {
88 switch (fpa11->fType[Fm]) {
89 case typeSingle:
90 rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
91 break;
92
93 case typeDouble:
94 rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
95 break;
96
97 case typeExtended:
98 rFm = fpa11->fpreg[Fm].fExtended;
99 break;
100
101 default:
102 return 0;
103 }
104 }
105
106 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
107 if (!MONADIC_INSTRUCTION(opcode)) {
108 unsigned int Fn = getFn(opcode);
109 floatx80 rFn;
110
111 switch (fpa11->fType[Fn]) {
112 case typeSingle:
113 rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
114 break;
115
116 case typeDouble:
117 rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
118 break;
119
120 case typeExtended:
121 rFn = fpa11->fpreg[Fn].fExtended;
122 break;
123
124 default:
125 return 0;
126 }
127
128 if (dyadic_extended[opc_mask_shift]) {
129 rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
130 } else {
131 return 0;
132 }
133 } else {
134 if (monadic_extended[opc_mask_shift]) {
135 rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
136 } else {
137 return 0;
138 }
139 }
140
141 return 1;
142 }
143