target/alpha/int_helper.c

   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_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 }