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
26 floatx80 floatx80_exp(floatx80 Fm);
27 floatx80 floatx80_ln(floatx80 Fm);
28 floatx80 floatx80_sin(floatx80 rFm);
29 floatx80 floatx80_cos(floatx80 rFm);
30 floatx80 floatx80_arcsin(floatx80 rFm);
31 floatx80 floatx80_arctan(floatx80 rFm);
32 floatx80 floatx80_log(floatx80 rFm);
33 floatx80 floatx80_tan(floatx80 rFm);
34 floatx80 floatx80_arccos(floatx80 rFm);
35 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
36 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
37
floatx80_rsf(struct roundingData * roundData,floatx80 rFn,floatx80 rFm)38 static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
39 {
40 return floatx80_sub(roundData, rFm, rFn);
41 }
42
floatx80_rdv(struct roundingData * roundData,floatx80 rFn,floatx80 rFm)43 static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
44 {
45 return floatx80_div(roundData, rFm, rFn);
46 }
47
48 static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
49 [ADF_CODE >> 20] = floatx80_add,
50 [MUF_CODE >> 20] = floatx80_mul,
51 [SUF_CODE >> 20] = floatx80_sub,
52 [RSF_CODE >> 20] = floatx80_rsf,
53 [DVF_CODE >> 20] = floatx80_div,
54 [RDF_CODE >> 20] = floatx80_rdv,
55 [RMF_CODE >> 20] = floatx80_rem,
56
57 /* strictly, these opcodes should not be implemented */
58 [FML_CODE >> 20] = floatx80_mul,
59 [FDV_CODE >> 20] = floatx80_div,
60 [FRD_CODE >> 20] = floatx80_rdv,
61 };
62
floatx80_mvf(struct roundingData * roundData,floatx80 rFm)63 static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
64 {
65 return rFm;
66 }
67
floatx80_mnf(struct roundingData * roundData,floatx80 rFm)68 static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
69 {
70 rFm.high ^= 0x8000;
71 return rFm;
72 }
73
floatx80_abs(struct roundingData * roundData,floatx80 rFm)74 static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
75 {
76 rFm.high &= 0x7fff;
77 return rFm;
78 }
79
80 static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
81 [MVF_CODE >> 20] = floatx80_mvf,
82 [MNF_CODE >> 20] = floatx80_mnf,
83 [ABS_CODE >> 20] = floatx80_abs,
84 [RND_CODE >> 20] = floatx80_round_to_int,
85 [URD_CODE >> 20] = floatx80_round_to_int,
86 [SQT_CODE >> 20] = floatx80_sqrt,
87 [NRM_CODE >> 20] = floatx80_mvf,
88 };
89
ExtendedCPDO(struct roundingData * roundData,const unsigned int opcode,FPREG * rFd)90 unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
91 {
92 FPA11 *fpa11 = GET_FPA11();
93 floatx80 rFm;
94 unsigned int Fm, opc_mask_shift;
95
96 Fm = getFm(opcode);
97 if (CONSTANT_FM(opcode)) {
98 rFm = getExtendedConstant(Fm);
99 } else {
100 switch (fpa11->fType[Fm]) {
101 case typeSingle:
102 rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
103 break;
104
105 case typeDouble:
106 rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
107 break;
108
109 case typeExtended:
110 rFm = fpa11->fpreg[Fm].fExtended;
111 break;
112
113 default:
114 return 0;
115 }
116 }
117
118 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
119 if (!MONADIC_INSTRUCTION(opcode)) {
120 unsigned int Fn = getFn(opcode);
121 floatx80 rFn;
122
123 switch (fpa11->fType[Fn]) {
124 case typeSingle:
125 rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
126 break;
127
128 case typeDouble:
129 rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
130 break;
131
132 case typeExtended:
133 rFn = fpa11->fpreg[Fn].fExtended;
134 break;
135
136 default:
137 return 0;
138 }
139
140 if (dyadic_extended[opc_mask_shift]) {
141 rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
142 } else {
143 return 0;
144 }
145 } else {
146 if (monadic_extended[opc_mask_shift]) {
147 rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
148 } else {
149 return 0;
150 }
151 }
152
153 return 1;
154 }
155