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 "helper.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 static inline uint64_t byte_zap(uint64_t op, uint8_t mskb)
  41 {
  42     uint64_t mask;
  43
  44     mask = 0;
  45     mask |= ((mskb >> 0) & 1) * 0x00000000000000FFULL;
  46     mask |= ((mskb >> 1) & 1) * 0x000000000000FF00ULL;
  47     mask |= ((mskb >> 2) & 1) * 0x0000000000FF0000ULL;
  48     mask |= ((mskb >> 3) & 1) * 0x00000000FF000000ULL;
  49     mask |= ((mskb >> 4) & 1) * 0x000000FF00000000ULL;
  50     mask |= ((mskb >> 5) & 1) * 0x0000FF0000000000ULL;
  51     mask |= ((mskb >> 6) & 1) * 0x00FF000000000000ULL;
  52     mask |= ((mskb >> 7) & 1) * 0xFF00000000000000ULL;
  53
  54     return op & ~mask;
  55 }
  56
  57 uint64_t helper_zap(uint64_t val, uint64_t mask)
  58 {
  59     return byte_zap(val, mask);
  60 }
  61
  62 uint64_t helper_zapnot(uint64_t val, uint64_t mask)
  63 {
  64     return byte_zap(val, ~mask);
  65 }
  66
  67 uint64_t helper_cmpbge(uint64_t op1, uint64_t op2)
  68 {
  69     uint8_t opa, opb, res;
  70     int i;
  71
  72     res = 0;
  73     for (i = 0; i < 8; i++) {
  74         opa = op1 >> (i * 8);
  75         opb = op2 >> (i * 8);
  76         if (opa >= opb) {
  77             res |= 1 << i;
  78         }
  79     }
  80     return res;
  81 }
  82
  83 uint64_t helper_minub8(uint64_t op1, uint64_t op2)
  84 {
  85     uint64_t res = 0;
  86     uint8_t opa, opb, opr;
  87     int i;
  88
  89     for (i = 0; i < 8; ++i) {
  90         opa = op1 >> (i * 8);
  91         opb = op2 >> (i * 8);
  92         opr = opa < opb ? opa : opb;
  93         res |= (uint64_t)opr << (i * 8);
  94     }
  95     return res;
  96 }
  97
  98 uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
  99 {
 100     uint64_t res = 0;
 101     int8_t opa, opb;
 102     uint8_t opr;
 103     int i;
 104
 105     for (i = 0; i < 8; ++i) {
 106         opa = op1 >> (i * 8);
 107         opb = op2 >> (i * 8);
 108         opr = opa < opb ? opa : opb;
 109         res |= (uint64_t)opr << (i * 8);
 110     }
 111     return res;
 112 }
 113
 114 uint64_t helper_minuw4(uint64_t op1, uint64_t op2)
 115 {
 116     uint64_t res = 0;
 117     uint16_t opa, opb, opr;
 118     int i;
 119
 120     for (i = 0; i < 4; ++i) {
 121         opa = op1 >> (i * 16);
 122         opb = op2 >> (i * 16);
 123         opr = opa < opb ? opa : opb;
 124         res |= (uint64_t)opr << (i * 16);
 125     }
 126     return res;
 127 }
 128
 129 uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
 130 {
 131     uint64_t res = 0;
 132     int16_t opa, opb;
 133     uint16_t opr;
 134     int i;
 135
 136     for (i = 0; i < 4; ++i) {
 137         opa = op1 >> (i * 16);
 138         opb = op2 >> (i * 16);
 139         opr = opa < opb ? opa : opb;
 140         res |= (uint64_t)opr << (i * 16);
 141     }
 142     return res;
 143 }
 144
 145 uint64_t helper_maxub8(uint64_t op1, uint64_t op2)
 146 {
 147     uint64_t res = 0;
 148     uint8_t opa, opb, opr;
 149     int i;
 150
 151     for (i = 0; i < 8; ++i) {
 152         opa = op1 >> (i * 8);
 153         opb = op2 >> (i * 8);
 154         opr = opa > opb ? opa : opb;
 155         res |= (uint64_t)opr << (i * 8);
 156     }
 157     return res;
 158 }
 159
 160 uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
 161 {
 162     uint64_t res = 0;
 163     int8_t opa, opb;
 164     uint8_t opr;
 165     int i;
 166
 167     for (i = 0; i < 8; ++i) {
 168         opa = op1 >> (i * 8);
 169         opb = op2 >> (i * 8);
 170         opr = opa > opb ? opa : opb;
 171         res |= (uint64_t)opr << (i * 8);
 172     }
 173     return res;
 174 }
 175
 176 uint64_t helper_maxuw4(uint64_t op1, uint64_t op2)
 177 {
 178     uint64_t res = 0;
 179     uint16_t opa, opb, opr;
 180     int i;
 181
 182     for (i = 0; i < 4; ++i) {
 183         opa = op1 >> (i * 16);
 184         opb = op2 >> (i * 16);
 185         opr = opa > opb ? opa : opb;
 186         res |= (uint64_t)opr << (i * 16);
 187     }
 188     return res;
 189 }
 190
 191 uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
 192 {
 193     uint64_t res = 0;
 194     int16_t opa, opb;
 195     uint16_t opr;
 196     int i;
 197
 198     for (i = 0; i < 4; ++i) {
 199         opa = op1 >> (i * 16);
 200         opb = op2 >> (i * 16);
 201         opr = opa > opb ? opa : opb;
 202         res |= (uint64_t)opr << (i * 16);
 203     }
 204     return res;
 205 }
 206
 207 uint64_t helper_perr(uint64_t op1, uint64_t op2)
 208 {
 209     uint64_t res = 0;
 210     uint8_t opa, opb, opr;
 211     int i;
 212
 213     for (i = 0; i < 8; ++i) {
 214         opa = op1 >> (i * 8);
 215         opb = op2 >> (i * 8);
 216         if (opa >= opb) {
 217             opr = opa - opb;
 218         } else {
 219             opr = opb - opa;
 220         }
 221         res += opr;
 222     }
 223     return res;
 224 }
 225
 226 uint64_t helper_pklb(uint64_t op1)
 227 {
 228     return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
 229 }
 230
 231 uint64_t helper_pkwb(uint64_t op1)
 232 {
 233     return ((op1 & 0xff)
 234             | ((op1 >> 8) & 0xff00)
 235             | ((op1 >> 16) & 0xff0000)
 236             | ((op1 >> 24) & 0xff000000));
 237 }
 238
 239 uint64_t helper_unpkbl(uint64_t op1)
 240 {
 241     return (op1 & 0xff) | ((op1 & 0xff00) << 24);
 242 }
 243
 244 uint64_t helper_unpkbw(uint64_t op1)
 245 {
 246     return ((op1 & 0xff)
 247             | ((op1 & 0xff00) << 8)
 248             | ((op1 & 0xff0000) << 16)
 249             | ((op1 & 0xff000000) << 24));
 250 }
 251
 252 uint64_t helper_addqv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 253 {
 254     uint64_t tmp = op1;
 255     op1 += op2;
 256     if (unlikely((tmp ^ op2 ^ (-1ULL)) & (tmp ^ op1) & (1ULL << 63))) {
 257         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 258     }
 259     return op1;
 260 }
 261
 262 uint64_t helper_addlv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 263 {
 264     uint64_t tmp = op1;
 265     op1 = (uint32_t)(op1 + op2);
 266     if (unlikely((tmp ^ op2 ^ (-1UL)) & (tmp ^ op1) & (1UL << 31))) {
 267         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 268     }
 269     return op1;
 270 }
 271
 272 uint64_t helper_subqv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 273 {
 274     uint64_t res;
 275     res = op1 - op2;
 276     if (unlikely((op1 ^ op2) & (res ^ op1) & (1ULL << 63))) {
 277         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 278     }
 279     return res;
 280 }
 281
 282 uint64_t helper_sublv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 283 {
 284     uint32_t res;
 285     res = op1 - op2;
 286     if (unlikely((op1 ^ op2) & (res ^ op1) & (1UL << 31))) {
 287         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 288     }
 289     return res;
 290 }
 291
 292 uint64_t helper_mullv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 293 {
 294     int64_t res = (int64_t)op1 * (int64_t)op2;
 295
 296     if (unlikely((int32_t)res != res)) {
 297         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 298     }
 299     return (int64_t)((int32_t)res);
 300 }
 301
 302 uint64_t helper_mulqv(CPUAlphaState *env, uint64_t op1, uint64_t op2)
 303 {
 304     uint64_t tl, th;
 305
 306     muls64(&tl, &th, op1, op2);
 307     /* If th != 0 && th != -1, then we had an overflow */
 308     if (unlikely((th + 1) > 1)) {
 309         arith_excp(env, GETPC(), EXC_M_IOV, 0);
 310     }
 311     return tl;
 312 }