xref: /qemu/target/alpha/int_helper.c (revision 33848cee) 
1 /*
2  *  Helpers for integer and multimedia instructions.
3  *
4  *  Copyright (c) 2007 Jocelyn Mayer
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "cpu.h"
22 #include "exec/exec-all.h"
23 #include "exec/helper-proto.h"
24 #include "qemu/host-utils.h"
25 
26 
27 uint64_t helper_ctpop(uint64_t arg)
28 {
29     return ctpop64(arg);
30 }
31 
32 uint64_t helper_ctlz(uint64_t arg)
33 {
34     return clz64(arg);
35 }
36 
37 uint64_t helper_cttz(uint64_t arg)
38 {
39     return ctz64(arg);
40 }
41 
42 uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
43 {
44     uint64_t mask;
45 
46     mask  = -(mskb & 0x01) & 0x00000000000000ffull;
47     mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
48     mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
49     mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
50     mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
51     mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
52     mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
53     mask |= -(mskb & 0x80) & 0xff00000000000000ull;
54 
55     return val & mask;
56 }
57 
58 uint64_t helper_zap(uint64_t val, uint64_t mask)
59 {
60     return helper_zapnot(val, ~mask);
61 }
62 
63 uint64_t helper_cmpbe0(uint64_t a)
64 {
65     uint64_t m = 0x7f7f7f7f7f7f7f7fULL;
66     uint64_t c = ~(((a & m) + m) | a | m);
67     /* a.......b.......c.......d.......e.......f.......g.......h....... */
68     c |= c << 7;
69     /* ab......bc......cd......de......ef......fg......gh......h....... */
70     c |= c << 14;
71     /* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */
72     c |= c << 28;
73     /* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */
74     return c >> 56;
75 }
76 
77 uint64_t helper_cmpbge(uint64_t a, uint64_t b)
78 {
79     uint64_t mask = 0x00ff00ff00ff00ffULL;
80     uint64_t test = 0x0100010001000100ULL;
81     uint64_t al, ah, bl, bh, cl, ch;
82 
83     /* Separate the bytes to avoid false positives.  */
84     al = a & mask;
85     bl = b & mask;
86     ah = (a >> 8) & mask;
87     bh = (b >> 8) & mask;
88 
89     /* "Compare".  If a byte in B is greater than a byte in A,
90        it will clear the test bit.  */
91     cl = ((al | test) - bl) & test;
92     ch = ((ah | test) - bh) & test;
93 
94     /* Fold all of the test bits into a contiguous set.  */
95     /* ch=.......a...............c...............e...............g........ */
96     /* cl=.......b...............d...............f...............h........ */
97     cl += ch << 1;
98     /* cl=......ab..............cd..............ef..............gh........ */
99     cl |= cl << 14;
100     /* cl=......abcd............cdef............efgh............gh........ */
101     cl |= cl << 28;
102     /* cl=......abcdefgh........cdefgh..........efgh............gh........ */
103     return cl >> 50;
104 }
105 
106 uint64_t helper_minub8(uint64_t op1, uint64_t op2)
107 {
108     uint64_t res = 0;
109     uint8_t opa, opb, opr;
110     int i;
111 
112     for (i = 0; i < 8; ++i) {
113         opa = op1 >> (i * 8);
114         opb = op2 >> (i * 8);
115         opr = opa < opb ? opa : opb;
116         res |= (uint64_t)opr << (i * 8);
117     }
118     return res;
119 }
120 
121 uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
122 {
123     uint64_t res = 0;
124     int8_t opa, opb;
125     uint8_t opr;
126     int i;
127 
128     for (i = 0; i < 8; ++i) {
129         opa = op1 >> (i * 8);
130         opb = op2 >> (i * 8);
131         opr = opa < opb ? opa : opb;
132         res |= (uint64_t)opr << (i * 8);
133     }
134     return res;
135 }
136 
137 uint64_t helper_minuw4(uint64_t op1, uint64_t op2)
138 {
139     uint64_t res = 0;
140     uint16_t opa, opb, opr;
141     int i;
142 
143     for (i = 0; i < 4; ++i) {
144         opa = op1 >> (i * 16);
145         opb = op2 >> (i * 16);
146         opr = opa < opb ? opa : opb;
147         res |= (uint64_t)opr << (i * 16);
148     }
149     return res;
150 }
151 
152 uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
153 {
154     uint64_t res = 0;
155     int16_t opa, opb;
156     uint16_t opr;
157     int i;
158 
159     for (i = 0; i < 4; ++i) {
160         opa = op1 >> (i * 16);
161         opb = op2 >> (i * 16);
162         opr = opa < opb ? opa : opb;
163         res |= (uint64_t)opr << (i * 16);
164     }
165     return res;
166 }
167 
168 uint64_t helper_maxub8(uint64_t op1, uint64_t op2)
169 {
170     uint64_t res = 0;
171     uint8_t opa, opb, opr;
172     int i;
173 
174     for (i = 0; i < 8; ++i) {
175         opa = op1 >> (i * 8);
176         opb = op2 >> (i * 8);
177         opr = opa > opb ? opa : opb;
178         res |= (uint64_t)opr << (i * 8);
179     }
180     return res;
181 }
182 
183 uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
184 {
185     uint64_t res = 0;
186     int8_t opa, opb;
187     uint8_t opr;
188     int i;
189 
190     for (i = 0; i < 8; ++i) {
191         opa = op1 >> (i * 8);
192         opb = op2 >> (i * 8);
193         opr = opa > opb ? opa : opb;
194         res |= (uint64_t)opr << (i * 8);
195     }
196     return res;
197 }
198 
199 uint64_t helper_maxuw4(uint64_t op1, uint64_t op2)
200 {
201     uint64_t res = 0;
202     uint16_t opa, opb, opr;
203     int i;
204 
205     for (i = 0; i < 4; ++i) {
206         opa = op1 >> (i * 16);
207         opb = op2 >> (i * 16);
208         opr = opa > opb ? opa : opb;
209         res |= (uint64_t)opr << (i * 16);
210     }
211     return res;
212 }
213 
214 uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
215 {
216     uint64_t res = 0;
217     int16_t opa, opb;
218     uint16_t opr;
219     int i;
220 
221     for (i = 0; i < 4; ++i) {
222         opa = op1 >> (i * 16);
223         opb = op2 >> (i * 16);
224         opr = opa > opb ? opa : opb;
225         res |= (uint64_t)opr << (i * 16);
226     }
227     return res;
228 }
229 
230 uint64_t helper_perr(uint64_t op1, uint64_t op2)
231 {
232     uint64_t res = 0;
233     uint8_t opa, opb, opr;
234     int i;
235 
236     for (i = 0; i < 8; ++i) {
237         opa = op1 >> (i * 8);
238         opb = op2 >> (i * 8);
239         if (opa >= opb) {
240             opr = opa - opb;
241         } else {
242             opr = opb - opa;
243         }
244         res += opr;
245     }
246     return res;
247 }
248 
249 uint64_t helper_pklb(uint64_t op1)
250 {
251     return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
252 }
253 
254 uint64_t helper_pkwb(uint64_t op1)
255 {
256     return ((op1 & 0xff)
257             | ((op1 >> 8) & 0xff00)
258             | ((op1 >> 16) & 0xff0000)
259             | ((op1 >> 24) & 0xff000000));
260 }
261 
262 uint64_t helper_unpkbl(uint64_t op1)
263 {
264     return (op1 & 0xff) | ((op1 & 0xff00) << 24);
265 }
266 
267 uint64_t helper_unpkbw(uint64_t op1)
268 {
269     return ((op1 & 0xff)
270             | ((op1 & 0xff00) << 8)
271             | ((op1 & 0xff0000) << 16)
272             | ((op1 & 0xff000000) << 24));
273 }
274 
275 void helper_check_overflow(CPUAlphaState *env, uint64_t op1, uint64_t op2)
276 {
277     if (unlikely(op1 != op2)) {
278         arith_excp(env, GETPC(), EXC_M_IOV, 0);
279     }
280 }
281