1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 NetWinder Floating Point Emulator
4 (c) Rebel.COM, 1998,1999
5 (c) Philip Blundell, 2001
6
7 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
8
9 */
10
11 #include "fpa11.h"
12 #include "softfloat.h"
13 #include "fpopcode.h"
14
15 float32 float32_exp(float32 Fm);
16 float32 float32_ln(float32 Fm);
17 float32 float32_sin(float32 rFm);
18 float32 float32_cos(float32 rFm);
19 float32 float32_arcsin(float32 rFm);
20 float32 float32_arctan(float32 rFm);
21 float32 float32_log(float32 rFm);
22 float32 float32_tan(float32 rFm);
23 float32 float32_arccos(float32 rFm);
24 float32 float32_pow(float32 rFn, float32 rFm);
25 float32 float32_pol(float32 rFn, float32 rFm);
26
float32_rsf(struct roundingData * roundData,float32 rFn,float32 rFm)27 static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm)
28 {
29 return float32_sub(roundData, rFm, rFn);
30 }
31
float32_rdv(struct roundingData * roundData,float32 rFn,float32 rFm)32 static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm)
33 {
34 return float32_div(roundData, rFm, rFn);
35 }
36
37 static float32 (*const dyadic_single[16])(struct roundingData *, float32 rFn, float32 rFm) = {
38 [ADF_CODE >> 20] = float32_add,
39 [MUF_CODE >> 20] = float32_mul,
40 [SUF_CODE >> 20] = float32_sub,
41 [RSF_CODE >> 20] = float32_rsf,
42 [DVF_CODE >> 20] = float32_div,
43 [RDF_CODE >> 20] = float32_rdv,
44 [RMF_CODE >> 20] = float32_rem,
45
46 [FML_CODE >> 20] = float32_mul,
47 [FDV_CODE >> 20] = float32_div,
48 [FRD_CODE >> 20] = float32_rdv,
49 };
50
float32_mvf(struct roundingData * roundData,float32 rFm)51 static float32 float32_mvf(struct roundingData *roundData, float32 rFm)
52 {
53 return rFm;
54 }
55
float32_mnf(struct roundingData * roundData,float32 rFm)56 static float32 float32_mnf(struct roundingData *roundData, float32 rFm)
57 {
58 return rFm ^ 0x80000000;
59 }
60
float32_abs(struct roundingData * roundData,float32 rFm)61 static float32 float32_abs(struct roundingData *roundData, float32 rFm)
62 {
63 return rFm & 0x7fffffff;
64 }
65
66 static float32 (*const monadic_single[16])(struct roundingData*, float32 rFm) = {
67 [MVF_CODE >> 20] = float32_mvf,
68 [MNF_CODE >> 20] = float32_mnf,
69 [ABS_CODE >> 20] = float32_abs,
70 [RND_CODE >> 20] = float32_round_to_int,
71 [URD_CODE >> 20] = float32_round_to_int,
72 [SQT_CODE >> 20] = float32_sqrt,
73 [NRM_CODE >> 20] = float32_mvf,
74 };
75
SingleCPDO(struct roundingData * roundData,const unsigned int opcode,FPREG * rFd)76 unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
77 {
78 FPA11 *fpa11 = GET_FPA11();
79 float32 rFm;
80 unsigned int Fm, opc_mask_shift;
81
82 Fm = getFm(opcode);
83 if (CONSTANT_FM(opcode)) {
84 rFm = getSingleConstant(Fm);
85 } else if (fpa11->fType[Fm] == typeSingle) {
86 rFm = fpa11->fpreg[Fm].fSingle;
87 } else {
88 return 0;
89 }
90
91 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
92 if (!MONADIC_INSTRUCTION(opcode)) {
93 unsigned int Fn = getFn(opcode);
94 float32 rFn;
95
96 if (fpa11->fType[Fn] == typeSingle &&
97 dyadic_single[opc_mask_shift]) {
98 rFn = fpa11->fpreg[Fn].fSingle;
99 rFd->fSingle = dyadic_single[opc_mask_shift](roundData, rFn, rFm);
100 } else {
101 return 0;
102 }
103 } else {
104 if (monadic_single[opc_mask_shift]) {
105 rFd->fSingle = monadic_single[opc_mask_shift](roundData, rFm);
106 } else {
107 return 0;
108 }
109 }
110
111 return 1;
112 }
113