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/helper-proto.h"
  23 #include "qemu/host-utils.h"
  24
  25
  26 uint64_t helper_ctpop(uint64_t arg)
  27 {
  28     return ctpop64(arg);
  29 }
  30
  31 uint64_t helper_ctlz(uint64_t arg)
  32 {
  33     return clz64(arg);
  34 }
  35
  36 uint64_t helper_cttz(uint64_t arg)
  37 {
  38     return ctz64(arg);
  39 }
  40
  41 uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
  42 {
  43     uint64_t mask;
  44
  45     mask  = -(mskb & 0x01) & 0x00000000000000ffull;
  46     mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
  47     mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
  48     mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
  49     mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
  50     mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
  51     mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
  52     mask |= -(mskb & 0x80) & 0xff00000000000000ull;
  53
  54     return val & mask;
  55 }
  56
  57 uint64_t helper_zap(uint64_t val, uint64_t mask)
  58 {
  59     return helper_zapnot(val, ~mask);
  60 }
  61
  62 uint64_t helper_cmpbe0(uint64_t a)
  63 {
  64     uint64_t m = 0x7f7f7f7f7f7f7f7fULL;
  65     uint64_t c = ~(((a & m) + m) | a | m);
  66     /* a.......b.......c.......d.......e.......f.......g.......h....... */
  67     c |= c << 7;
  68     /* ab......bc......cd......de......ef......fg......gh......h....... */
  69     c |= c << 14;
  70     /* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */
  71     c |= c << 28;
  72     /* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */
  73     return c >> 56;
  74 }
  75
  76 uint64_t helper_cmpbge(uint64_t a, uint64_t b)
  77 {
  78     uint64_t mask = 0x00ff00ff00ff00ffULL;
  79     uint64_t test = 0x0100010001000100ULL;
  80     uint64_t al, ah, bl, bh, cl, ch;
  81
  82     /* Separate the bytes to avoid false positives.  */
  83     al = a & mask;
  84     bl = b & mask;
  85     ah = (a >> 8) & mask;
  86     bh = (b >> 8) & mask;
  87
  88     /* "Compare".  If a byte in B is greater than a byte in A,
  89        it will clear the test bit.  */
  90     cl = ((al | test) - bl) & test;
  91     ch = ((ah | test) - bh) & test;
  92
  93     /* Fold all of the test bits into a contiguous set.  */
  94     /* ch=.......a...............c...............e...............g........ */
  95     /* cl=.......b...............d...............f...............h........ */
  96     cl += ch << 1;
  97     /* cl=......ab..............cd..............ef..............gh........ */
  98     cl |= cl << 14;
  99     /* cl=......abcd............cdef............efgh............gh........ */
 100     cl |= cl << 28;
 101     /* cl=......abcdefgh........cdefgh..........efgh............gh........ */
 102     return cl >> 50;
 103 }
 104
 105 uint64_t helper_minub8(uint64_t op1, uint64_t op2)
 106 {
 107     uint64_t res = 0;
 108     uint8_t opa, opb, opr;
 109     int i;
 110
 111     for (i = 0; i < 8; ++i) {
 112         opa = op1 >> (i * 8);
 113         opb = op2 >> (i * 8);
 114         opr = opa < opb ? opa : opb;
 115         res |= (uint64_t)opr << (i * 8);
 116     }
 117     return res;
 118 }
 119
 120 uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
 121 {
 122     uint64_t res = 0;
 123     int8_t opa, opb;
 124     uint8_t opr;
 125     int i;
 126
 127     for (i = 0; i < 8; ++i) {
 128         opa = op1 >> (i * 8);
 129         opb = op2 >> (i * 8);
 130         opr = opa < opb ? opa : opb;
 131         res |= (uint64_t)opr << (i * 8);
 132     }
 133     return res;
 134 }
 135
 136 uint64_t helper_minuw4(uint64_t op1, uint64_t op2)
 137 {
 138     uint64_t res = 0;
 139     uint16_t opa, opb, opr;
 140     int i;
 141
 142     for (i = 0; i < 4; ++i) {
 143         opa = op1 >> (i * 16);
 144         opb = op2 >> (i * 16);
 145         opr = opa < opb ? opa : opb;
 146         res |= (uint64_t)opr << (i * 16);
 147     }
 148     return res;
 149 }
 150
 151 uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
 152 {
 153     uint64_t res = 0;
 154     int16_t opa, opb;
 155     uint16_t opr;
 156     int i;
 157
 158     for (i = 0; i < 4; ++i) {
 159         opa = op1 >> (i * 16);
 160         opb = op2 >> (i * 16);
 161         opr = opa < opb ? opa : opb;
 162         res |= (uint64_t)opr << (i * 16);
 163     }
 164     return res;
 165 }
 166
 167 uint64_t helper_maxub8(uint64_t op1, uint64_t op2)
 168 {
 169     uint64_t res = 0;
 170     uint8_t opa, opb, opr;
 171     int i;
 172
 173     for (i = 0; i < 8; ++i) {
 174         opa = op1 >> (i * 8);
 175         opb = op2 >> (i * 8);
 176         opr = opa > opb ? opa : opb;
 177         res |= (uint64_t)opr << (i * 8);
 178     }
 179     return res;
 180 }
 181
 182 uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
 183 {
 184     uint64_t res = 0;
 185     int8_t opa, opb;
 186     uint8_t opr;
 187     int i;
 188
 189     for (i = 0; i < 8; ++i) {
 190         opa = op1 >> (i * 8);
 191         opb = op2 >> (i * 8);
 192         opr = opa > opb ? opa : opb;
 193         res |= (uint64_t)opr << (i * 8);
 194     }
 195     return res;
 196 }
 197
 198 uint64_t helper_maxuw4(uint64_t op1, uint64_t op2)
 199 {
 200     uint64_t res = 0;
 201     uint16_t opa, opb, opr;
 202     int i;
 203
 204     for (i = 0; i < 4; ++i) {
 205         opa = op1 >> (i * 16);
 206         opb = op2 >> (i * 16);
 207         opr = opa > opb ? opa : opb;
 208         res |= (uint64_t)opr << (i * 16);
 209     }
 210     return res;
 211 }
 212
 213 uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
 214 {
 215     uint64_t res = 0;
 216     int16_t opa, opb;
 217     uint16_t opr;
 218     int i;
 219
 220     for (i = 0; i < 4; ++i) {
 221         opa = op1 >> (i * 16);
 222         opb = op2 >> (i * 16);
 223         opr = opa > opb ? opa : opb;
 224         res |= (uint64_t)opr << (i * 16);
 225     }
 226     return res;
 227 }
 228
 229 uint64_t helper_perr(uint64_t op1, uint64_t op2)
 230 {
 231     uint64_t res = 0;
 232     uint8_t opa, opb, opr;
 233     int i;
 234
 235     for (i = 0; i < 8; ++i) {
 236         opa = op1 >> (i * 8);
 237         opb = op2 >> (i * 8);
 238         if (opa >= opb) {
 239             opr = opa - opb;
 240         } else {
 241             opr = opb - opa;
 242         }
 243         res += opr;
 244     }
 245     return res;
 246 }
 247
 248 uint64_t helper_pklb(uint64_t op1)
 249 {
 250     return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
 251 }
 252
 253 uint64_t helper_pkwb(uint64_t op1)
 254 {
 255     return ((op1 & 0xff)
 256             | ((op1 >> 8) & 0xff00)
 257             | ((op1 >> 16) & 0xff0000)
 258             | ((op1 >> 24) & 0xff000000));
 259 }
 260
 261 uint64_t helper_unpkbl(uint64_t op1)
 262 {
 263     return (op1 & 0xff) | ((op1 & 0xff00) << 24);
 264 }
 265
 266 uint64_t helper_unpkbw(uint64_t op1)
 267 {
 268     return ((op1 & 0xff)
 269             | ((op1 & 0xff00) << 8)
 270             | ((op1 & 0xff0000) << 16)
 271             | ((op1 & 0xff000000) << 24));
 272 }
 273
 274 void helper_check_overflow(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 275 {
 276     if (unlikely(op1 != op2)) {
 277         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 278     }
 279 }