xref: /openbmc/qemu/target/alpha/int_helper.c (revision c09124dc) 
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 2.1 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_zapnot(uint64_t val, uint64_t mskb)
28 {
29     uint64_t mask;
30 
31     mask  = -(mskb & 0x01) & 0x00000000000000ffull;
32     mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
33     mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
34     mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
35     mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
36     mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
37     mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
38     mask |= -(mskb & 0x80) & 0xff00000000000000ull;
39 
40     return val & mask;
41 }
42 
43 uint64_t helper_zap(uint64_t val, uint64_t mask)
44 {
45     return helper_zapnot(val, ~mask);
46 }
47 
48 uint64_t helper_cmpbe0(uint64_t a)
49 {
50     uint64_t m = 0x7f7f7f7f7f7f7f7fULL;
51     uint64_t c = ~(((a & m) + m) | a | m);
52     /* a.......b.......c.......d.......e.......f.......g.......h....... */
53     c |= c << 7;
54     /* ab......bc......cd......de......ef......fg......gh......h....... */
55     c |= c << 14;
56     /* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */
57     c |= c << 28;
58     /* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */
59     return c >> 56;
60 }
61 
62 uint64_t helper_cmpbge(uint64_t a, uint64_t b)
63 {
64     uint64_t mask = 0x00ff00ff00ff00ffULL;
65     uint64_t test = 0x0100010001000100ULL;
66     uint64_t al, ah, bl, bh, cl, ch;
67 
68     /* Separate the bytes to avoid false positives.  */
69     al = a & mask;
70     bl = b & mask;
71     ah = (a >> 8) & mask;
72     bh = (b >> 8) & mask;
73 
74     /* "Compare".  If a byte in B is greater than a byte in A,
75        it will clear the test bit.  */
76     cl = ((al | test) - bl) & test;
77     ch = ((ah | test) - bh) & test;
78 
79     /* Fold all of the test bits into a contiguous set.  */
80     /* ch=.......a...............c...............e...............g........ */
81     /* cl=.......b...............d...............f...............h........ */
82     cl += ch << 1;
83     /* cl=......ab..............cd..............ef..............gh........ */
84     cl |= cl << 14;
85     /* cl=......abcd............cdef............efgh............gh........ */
86     cl |= cl << 28;
87     /* cl=......abcdefgh........cdefgh..........efgh............gh........ */
88     return cl >> 50;
89 }
90 
91 uint64_t helper_minub8(uint64_t op1, uint64_t op2)
92 {
93     uint64_t res = 0;
94     uint8_t opa, opb, opr;
95     int i;
96 
97     for (i = 0; i < 8; ++i) {
98         opa = op1 >> (i * 8);
99         opb = op2 >> (i * 8);
100         opr = opa < opb ? opa : opb;
101         res |= (uint64_t)opr << (i * 8);
102     }
103     return res;
104 }
105 
106 uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
107 {
108     uint64_t res = 0;
109     int8_t opa, opb;
110     uint8_t opr;
111     int i;
112 
113     for (i = 0; i < 8; ++i) {
114         opa = op1 >> (i * 8);
115         opb = op2 >> (i * 8);
116         opr = opa < opb ? opa : opb;
117         res |= (uint64_t)opr << (i * 8);
118     }
119     return res;
120 }
121 
122 uint64_t helper_minuw4(uint64_t op1, uint64_t op2)
123 {
124     uint64_t res = 0;
125     uint16_t opa, opb, opr;
126     int i;
127 
128     for (i = 0; i < 4; ++i) {
129         opa = op1 >> (i * 16);
130         opb = op2 >> (i * 16);
131         opr = opa < opb ? opa : opb;
132         res |= (uint64_t)opr << (i * 16);
133     }
134     return res;
135 }
136 
137 uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
138 {
139     uint64_t res = 0;
140     int16_t opa, opb;
141     uint16_t opr;
142     int i;
143 
144     for (i = 0; i < 4; ++i) {
145         opa = op1 >> (i * 16);
146         opb = op2 >> (i * 16);
147         opr = opa < opb ? opa : opb;
148         res |= (uint64_t)opr << (i * 16);
149     }
150     return res;
151 }
152 
153 uint64_t helper_maxub8(uint64_t op1, uint64_t op2)
154 {
155     uint64_t res = 0;
156     uint8_t opa, opb, opr;
157     int i;
158 
159     for (i = 0; i < 8; ++i) {
160         opa = op1 >> (i * 8);
161         opb = op2 >> (i * 8);
162         opr = opa > opb ? opa : opb;
163         res |= (uint64_t)opr << (i * 8);
164     }
165     return res;
166 }
167 
168 uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
169 {
170     uint64_t res = 0;
171     int8_t opa, opb;
172     uint8_t opr;
173     int i;
174 
175     for (i = 0; i < 8; ++i) {
176         opa = op1 >> (i * 8);
177         opb = op2 >> (i * 8);
178         opr = opa > opb ? opa : opb;
179         res |= (uint64_t)opr << (i * 8);
180     }
181     return res;
182 }
183 
184 uint64_t helper_maxuw4(uint64_t op1, uint64_t op2)
185 {
186     uint64_t res = 0;
187     uint16_t opa, opb, opr;
188     int i;
189 
190     for (i = 0; i < 4; ++i) {
191         opa = op1 >> (i * 16);
192         opb = op2 >> (i * 16);
193         opr = opa > opb ? opa : opb;
194         res |= (uint64_t)opr << (i * 16);
195     }
196     return res;
197 }
198 
199 uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
200 {
201     uint64_t res = 0;
202     int16_t opa, opb;
203     uint16_t opr;
204     int i;
205 
206     for (i = 0; i < 4; ++i) {
207         opa = op1 >> (i * 16);
208         opb = op2 >> (i * 16);
209         opr = opa > opb ? opa : opb;
210         res |= (uint64_t)opr << (i * 16);
211     }
212     return res;
213 }
214 
215 uint64_t helper_perr(uint64_t op1, uint64_t op2)
216 {
217     uint64_t res = 0;
218     uint8_t opa, opb, opr;
219     int i;
220 
221     for (i = 0; i < 8; ++i) {
222         opa = op1 >> (i * 8);
223         opb = op2 >> (i * 8);
224         if (opa >= opb) {
225             opr = opa - opb;
226         } else {
227             opr = opb - opa;
228         }
229         res += opr;
230     }
231     return res;
232 }
233 
234 uint64_t helper_pklb(uint64_t op1)
235 {
236     return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
237 }
238 
239 uint64_t helper_pkwb(uint64_t op1)
240 {
241     return ((op1 & 0xff)
242             | ((op1 >> 8) & 0xff00)
243             | ((op1 >> 16) & 0xff0000)
244             | ((op1 >> 24) & 0xff000000));
245 }
246 
247 uint64_t helper_unpkbl(uint64_t op1)
248 {
249     return (op1 & 0xff) | ((op1 & 0xff00) << 24);
250 }
251 
252 uint64_t helper_unpkbw(uint64_t op1)
253 {
254     return ((op1 & 0xff)
255             | ((op1 & 0xff00) << 8)
256             | ((op1 & 0xff0000) << 16)
257             | ((op1 & 0xff000000) << 24));
258 }
259 
260 void helper_check_overflow(CPUAlphaState *env, uint64_t op1, uint64_t op2)
261 {
262     if (unlikely(op1 != op2)) {
263         arith_excp(env, GETPC(), EXC_M_IOV, 0);
264     }
265 }
266