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 | |
27 | static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm) |
28 | { |
29 | return float32_sub(roundData, rFm, rFn); |
30 | } |
31 | |
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 | |
51 | static float32 float32_mvf(struct roundingData *roundData, float32 rFm) |
52 | { |
53 | return rFm; |
54 | } |
55 | |
56 | static float32 float32_mnf(struct roundingData *roundData, float32 rFm) |
57 | { |
58 | return rFm ^ 0x80000000; |
59 | } |
60 | |
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 | |
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(nIndex: 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 | |