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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
* x86 condition code helpers
*
* Copyright (c) 2008 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#define DATA_BITS (1 << (3 + SHIFT))
#if DATA_BITS == 8
#define SUFFIX b
#define DATA_TYPE uint8_t
#elif DATA_BITS == 16
#define SUFFIX w
#define DATA_TYPE uint16_t
#elif DATA_BITS == 32
#define SUFFIX l
#define DATA_TYPE uint32_t
#elif DATA_BITS == 64
#define SUFFIX q
#define DATA_TYPE uint64_t
#else
#error unhandled operand size
#endif
#define SIGN_MASK (((DATA_TYPE)1) << (DATA_BITS - 1))
/* dynamic flags computation */
static int glue(compute_all_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src2 = dst - src1;
cf = dst < src1;
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & CC_A;
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
return dst < src1;
}
static int glue(compute_all_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
DATA_TYPE src3)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src2 = dst - src1 - src3;
cf = (src3 ? dst <= src1 : dst < src1);
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & 0x10;
zf = (dst == 0) << 6;
sf = lshift(dst, 8 - DATA_BITS) & 0x80;
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
DATA_TYPE src3)
{
return src3 ? dst <= src1 : dst < src1;
}
static int glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src1 = dst + src2;
cf = src1 < src2;
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & CC_A;
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
{
DATA_TYPE src1 = dst + src2;
return src1 < src2;
}
static int glue(compute_all_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
DATA_TYPE src3)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src1 = dst + src2 + src3;
cf = (src3 ? src1 <= src2 : src1 < src2);
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & 0x10;
zf = (dst == 0) << 6;
sf = lshift(dst, 8 - DATA_BITS) & 0x80;
of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
DATA_TYPE src3)
{
DATA_TYPE src1 = dst + src2 + src3;
return (src3 ? src1 <= src2 : src1 < src2);
}
static int glue(compute_all_logic, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
cf = 0;
pf = parity_table[(uint8_t)dst];
af = 0;
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = 0;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_all_inc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src2;
cf = src1;
src1 = dst - 1;
src2 = 1;
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & CC_A;
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = (dst == SIGN_MASK) * CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_all_dec, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
DATA_TYPE src2;
cf = src1;
src1 = dst + 1;
src2 = 1;
pf = parity_table[(uint8_t)dst];
af = (dst ^ src1 ^ src2) & CC_A;
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = (dst == SIGN_MASK - 1) * CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_all_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
cf = (src1 >> (DATA_BITS - 1)) & CC_C;
pf = parity_table[(uint8_t)dst];
af = 0; /* undefined */
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
/* of is defined iff shift count == 1 */
of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
return (src1 >> (DATA_BITS - 1)) & CC_C;
}
static int glue(compute_all_sar, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
cf = src1 & 1;
pf = parity_table[(uint8_t)dst];
af = 0; /* undefined */
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
/* of is defined iff shift count == 1 */
of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
return cf | pf | af | zf | sf | of;
}
/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
CF are modified and it is slower to do that. Note as well that we
don't truncate SRC1 for computing carry to DATA_TYPE. */
static int glue(compute_all_mul, SUFFIX)(DATA_TYPE dst, target_long src1)
{
int cf, pf, af, zf, sf, of;
cf = (src1 != 0);
pf = parity_table[(uint8_t)dst];
af = 0; /* undefined */
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = cf * CC_O;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_all_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
int cf, pf, af, zf, sf, of;
cf = (src1 == 0);
pf = 0; /* undefined */
af = 0; /* undefined */
zf = (dst == 0) * CC_Z;
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
of = 0;
return cf | pf | af | zf | sf | of;
}
static int glue(compute_c_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
{
return src1 == 0;
}
#undef DATA_BITS
#undef SIGN_MASK
#undef DATA_TYPE
#undef DATA_MASK
#undef SUFFIX
|
