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 "cpu.h"
  21 #include "exec/helper-proto.h"
  22 #include "qemu/host-utils.h"
  23
  24
  25 uint64_t helper_ctpop(uint64_t arg)
  26 {
  27     return ctpop64(arg);
  28 }
  29
  30 uint64_t helper_ctlz(uint64_t arg)
  31 {
  32     return clz64(arg);
  33 }
  34
  35 uint64_t helper_cttz(uint64_t arg)
  36 {
  37     return ctz64(arg);
  38 }
  39
  40 uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
  41 {
  42     uint64_t mask;
  43
  44     mask  = -(mskb & 0x01) & 0x00000000000000ffull;
  45     mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
  46     mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
  47     mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
  48     mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
  49     mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
  50     mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
  51     mask |= -(mskb & 0x80) & 0xff00000000000000ull;
  52
  53     return val & mask;
  54 }
  55
  56 uint64_t helper_zap(uint64_t val, uint64_t mask)
  57 {
  58     return helper_zapnot(val, ~mask);
  59 }
  60
  61 uint64_t helper_cmpbge(uint64_t a, uint64_t b)
  62 {
  63     uint64_t mask = 0x00ff00ff00ff00ffULL;
  64     uint64_t test = 0x0100010001000100ULL;
  65     uint64_t al, ah, bl, bh, cl, ch;
  66
  67     /* Separate the bytes to avoid false positives.  */
  68     al = a & mask;
  69     bl = b & mask;
  70     ah = (a >> 8) & mask;
  71     bh = (b >> 8) & mask;
  72
  73     /* "Compare".  If a byte in B is greater than a byte in A,
  74        it will clear the test bit.  */
  75     cl = ((al | test) - bl) & test;
  76     ch = ((ah | test) - bh) & test;
  77
  78     /* Fold all of the test bits into a contiguous set.  */
  79     /* ch=.......a...............c...............e...............g........ */
  80     /* cl=.......b...............d...............f...............h........ */
  81     cl += ch << 1;
  82     /* cl=......ab..............cd..............ef..............gh........ */
  83     cl |= cl << 14;
  84     /* cl=......abcd............cdef............efgh............gh........ */
  85     cl |= cl << 28;
  86     /* cl=......abcdefgh........cdefgh..........efgh............gh........ */
  87     return cl >> 50;
  88 }
  89
  90 uint64_t helper_minub8(uint64_t op1, uint64_t op2)
  91 {
  92     uint64_t res = 0;
  93     uint8_t opa, opb, opr;
  94     int i;
  95
  96     for (i = 0; i < 8; ++i) {
  97         opa = op1 >> (i * 8);
  98         opb = op2 >> (i * 8);
  99         opr = opa < opb ? opa : opb;
 100         res |= (uint64_t)opr << (i * 8);
 101     }
 102     return res;
 103 }
 104
 105 uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
 106 {
 107     uint64_t res = 0;
 108     int8_t opa, opb;
 109     uint8_t 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_minuw4(uint64_t op1, uint64_t op2)
 122 {
 123     uint64_t res = 0;
 124     uint16_t opa, opb, opr;
 125     int i;
 126
 127     for (i = 0; i < 4; ++i) {
 128         opa = op1 >> (i * 16);
 129         opb = op2 >> (i * 16);
 130         opr = opa < opb ? opa : opb;
 131         res |= (uint64_t)opr << (i * 16);
 132     }
 133     return res;
 134 }
 135
 136 uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
 137 {
 138     uint64_t res = 0;
 139     int16_t opa, opb;
 140     uint16_t 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_maxub8(uint64_t op1, uint64_t op2)
 153 {
 154     uint64_t res = 0;
 155     uint8_t opa, opb, opr;
 156     int i;
 157
 158     for (i = 0; i < 8; ++i) {
 159         opa = op1 >> (i * 8);
 160         opb = op2 >> (i * 8);
 161         opr = opa > opb ? opa : opb;
 162         res |= (uint64_t)opr << (i * 8);
 163     }
 164     return res;
 165 }
 166
 167 uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
 168 {
 169     uint64_t res = 0;
 170     int8_t opa, opb;
 171     uint8_t 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_maxuw4(uint64_t op1, uint64_t op2)
 184 {
 185     uint64_t res = 0;
 186     uint16_t opa, opb, opr;
 187     int i;
 188
 189     for (i = 0; i < 4; ++i) {
 190         opa = op1 >> (i * 16);
 191         opb = op2 >> (i * 16);
 192         opr = opa > opb ? opa : opb;
 193         res |= (uint64_t)opr << (i * 16);
 194     }
 195     return res;
 196 }
 197
 198 uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
 199 {
 200     uint64_t res = 0;
 201     int16_t opa, opb;
 202     uint16_t 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_perr(uint64_t op1, uint64_t op2)
 215 {
 216     uint64_t res = 0;
 217     uint8_t opa, opb, opr;
 218     int i;
 219
 220     for (i = 0; i < 8; ++i) {
 221         opa = op1 >> (i * 8);
 222         opb = op2 >> (i * 8);
 223         if (opa >= opb) {
 224             opr = opa - opb;
 225         } else {
 226             opr = opb - opa;
 227         }
 228         res += opr;
 229     }
 230     return res;
 231 }
 232
 233 uint64_t helper_pklb(uint64_t op1)
 234 {
 235     return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
 236 }
 237
 238 uint64_t helper_pkwb(uint64_t op1)
 239 {
 240     return ((op1 & 0xff)
 241             | ((op1 >> 8) & 0xff00)
 242             | ((op1 >> 16) & 0xff0000)
 243             | ((op1 >> 24) & 0xff000000));
 244 }
 245
 246 uint64_t helper_unpkbl(uint64_t op1)
 247 {
 248     return (op1 & 0xff) | ((op1 & 0xff00) << 24);
 249 }
 250
 251 uint64_t helper_unpkbw(uint64_t op1)
 252 {
 253     return ((op1 & 0xff)
 254             | ((op1 & 0xff00) << 8)
 255             | ((op1 & 0xff0000) << 16)
 256             | ((op1 & 0xff000000) << 24));
 257 }
 258
 259 void helper_check_overflow(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 260 {
 261     if (unlikely(op1 != op2)) {
 262         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 263     }
 264 }