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
15float32 float32_exp(float32 Fm);
16float32 float32_ln(float32 Fm);
17float32 float32_sin(float32 rFm);
18float32 float32_cos(float32 rFm);
19float32 float32_arcsin(float32 rFm);
20float32 float32_arctan(float32 rFm);
21float32 float32_log(float32 rFm);
22float32 float32_tan(float32 rFm);
23float32 float32_arccos(float32 rFm);
24float32 float32_pow(float32 rFn, float32 rFm);
25float32 float32_pol(float32 rFn, float32 rFm);
26
27static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm)
28{
29	return float32_sub(roundData, rFm, rFn);
30}
31
32static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm)
33{
34	return float32_div(roundData, rFm, rFn);
35}
36
37static 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
51static float32 float32_mvf(struct roundingData *roundData, float32 rFm)
52{
53	return rFm;
54}
55
56static float32 float32_mnf(struct roundingData *roundData, float32 rFm)
57{
58	return rFm ^ 0x80000000;
59}
60
61static float32 float32_abs(struct roundingData *roundData, float32 rFm)
62{
63	return rFm & 0x7fffffff;
64}
65
66static 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
76unsigned 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