1 /*
2 NetWinder Floating Point Emulator
3 (c) Rebel.COM, 1998,1999
4 (c) Philip Blundell, 2001
5
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "fpa11.h"
24 #include "softfloat.h"
25 #include "fpopcode.h"
26
27 float32 float32_exp(float32 Fm);
28 float32 float32_ln(float32 Fm);
29 float32 float32_sin(float32 rFm);
30 float32 float32_cos(float32 rFm);
31 float32 float32_arcsin(float32 rFm);
32 float32 float32_arctan(float32 rFm);
33 float32 float32_log(float32 rFm);
34 float32 float32_tan(float32 rFm);
35 float32 float32_arccos(float32 rFm);
36 float32 float32_pow(float32 rFn, float32 rFm);
37 float32 float32_pol(float32 rFn, float32 rFm);
38
float32_rsf(float32 rFn,float32 rFm)39 static float32 float32_rsf(float32 rFn, float32 rFm)
40 {
41 return float32_sub(rFm, rFn);
42 }
43
float32_rdv(float32 rFn,float32 rFm)44 static float32 float32_rdv(float32 rFn, float32 rFm)
45 {
46 return float32_div(rFm, rFn);
47 }
48
49 static float32 (*const dyadic_single[16])(float32 rFn, float32 rFm) = {
50 [ADF_CODE >> 20] = float32_add,
51 [MUF_CODE >> 20] = float32_mul,
52 [SUF_CODE >> 20] = float32_sub,
53 [RSF_CODE >> 20] = float32_rsf,
54 [DVF_CODE >> 20] = float32_div,
55 [RDF_CODE >> 20] = float32_rdv,
56 [RMF_CODE >> 20] = float32_rem,
57
58 [FML_CODE >> 20] = float32_mul,
59 [FDV_CODE >> 20] = float32_div,
60 [FRD_CODE >> 20] = float32_rdv,
61 };
62
float32_mvf(float32 rFm)63 static float32 float32_mvf(float32 rFm)
64 {
65 return rFm;
66 }
67
float32_mnf(float32 rFm)68 static float32 float32_mnf(float32 rFm)
69 {
70 return rFm ^ 0x80000000;
71 }
72
float32_abs(float32 rFm)73 static float32 float32_abs(float32 rFm)
74 {
75 return rFm & 0x7fffffff;
76 }
77
78 static float32 (*const monadic_single[16])(float32 rFm) = {
79 [MVF_CODE >> 20] = float32_mvf,
80 [MNF_CODE >> 20] = float32_mnf,
81 [ABS_CODE >> 20] = float32_abs,
82 [RND_CODE >> 20] = float32_round_to_int,
83 [URD_CODE >> 20] = float32_round_to_int,
84 [SQT_CODE >> 20] = float32_sqrt,
85 [NRM_CODE >> 20] = float32_mvf,
86 };
87
SingleCPDO(const unsigned int opcode,FPREG * rFd)88 unsigned int SingleCPDO(const unsigned int opcode, FPREG * rFd)
89 {
90 FPA11 *fpa11 = GET_FPA11();
91 float32 rFm;
92 unsigned int Fm, opc_mask_shift;
93
94 Fm = getFm(opcode);
95 if (CONSTANT_FM(opcode)) {
96 rFm = getSingleConstant(Fm);
97 } else if (fpa11->fType[Fm] == typeSingle) {
98 rFm = fpa11->fpreg[Fm].fSingle;
99 } else {
100 return 0;
101 }
102
103 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
104 if (!MONADIC_INSTRUCTION(opcode)) {
105 unsigned int Fn = getFn(opcode);
106 float32 rFn;
107
108 if (fpa11->fType[Fn] == typeSingle &&
109 dyadic_single[opc_mask_shift]) {
110 rFn = fpa11->fpreg[Fn].fSingle;
111 rFd->fSingle = dyadic_single[opc_mask_shift](rFn, rFm);
112 } else {
113 return 0;
114 }
115 } else {
116 if (monadic_single[opc_mask_shift]) {
117 rFd->fSingle = monadic_single[opc_mask_shift](rFm);
118 } else {
119 return 0;
120 }
121 }
122
123 return 1;
124 }
125