blob: ecf49189cababe51402a5d30a824a66b60f2324d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// Copyright (C) 2003-2009 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
// Additional copyrights go to Duddie and Tratax (c) 2004
// HELPER FUNCTIONS
#include "DSPIntCCUtil.h"
#include "DSPCore.h"
#include "DSPInterpreter.h"
namespace DSPInterpreter {
void Update_SR_Register64(s64 _Value)
{
g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
if (_Value < 0)
{
g_dsp.r[DSP_REG_SR] |= 0x8;
}
if (_Value == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x4;
}
// weird
if ((_Value >> 62) == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x20;
}
}
void Update_SR_Register16(s16 _Value)
{
g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
if (_Value < 0)
{
g_dsp.r[DSP_REG_SR] |= 0x8;
}
if (_Value == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x4;
}
// weird
if ((_Value >> 14) == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x20;
}
}
void Update_SR_LZ(s64 value) {
if (value == 0)
{
g_dsp.r[DSP_REG_SR] |= SR_LOGIC_ZERO;
}
else
{
g_dsp.r[DSP_REG_SR] &= ~SR_LOGIC_ZERO;
}
}
int GetMultiplyModifier()
{
if (g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY)
return 1;
else
return 2;
}
inline bool isCarry() {
return (g_dsp.r[DSP_REG_SR] & 0x01) ? true : false;
}
inline bool isSign() {
return ((g_dsp.r[DSP_REG_SR] & 0x02) != (g_dsp.r[DSP_REG_SR] & 0x08));
}
inline bool isZero() {
return (g_dsp.r[DSP_REG_SR] & 0x04) ? true : false;
}
//see gdsp_registers.h for flags
bool CheckCondition(u8 _Condition)
{
bool taken = false;
switch (_Condition & 0xf)
{
case 0x0: //NS - NOT SIGN
if (! isSign())
taken = true;
break;
case 0x1: // S - SIGN
if (isSign())
taken = true;
break;
case 0x2: // G - GREATER
if (! isSign() && !isZero())
taken = true;
break;
case 0x3: // LE - LESS EQUAL
if (isSign() || isZero())
taken = true;
break;
case 0x4: // NZ - NOT ZERO
if (!isZero())
taken = true;
break;
case 0x5: // Z - ZERO
if (isZero())
taken = true;
break;
case 0x6: // L - LESS
// Should be that once we set 0x01
if (!isCarry())
// if (isSign())
taken = true;
break;
case 0x7: // GE - GREATER EQUAL
// Should be that once we set 0x01
if (isCarry())
// if (! isSign() || isZero())
taken = true;
break;
case 0xc: // LNZ - LOGIC NOT ZERO
if (!(g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO))
taken = true;
break;
case 0xd: // LZ - LOGIC ZERO
if (g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO)
taken = true;
break;
case 0xf: // Empty
taken = true;
break;
default:
ERROR_LOG(DSPLLE, "Unknown condition check: 0x%04x\n", _Condition & 0xf);
break;
}
return taken;
}
} // namespace
|
