| 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/helper-proto.h" |
| 23 | #include "qemu/host-utils.h" |
| 24 | |
| 25 | |
| 26 | uint64_t helper_zapnot(uint64_t val, uint64_t mskb) |
| 27 | { |
| 28 | uint64_t mask; |
| 29 | |
| 30 | mask = -(mskb & 0x01) & 0x00000000000000ffull; |
| 31 | mask |= -(mskb & 0x02) & 0x000000000000ff00ull; |
| 32 | mask |= -(mskb & 0x04) & 0x0000000000ff0000ull; |
| 33 | mask |= -(mskb & 0x08) & 0x00000000ff000000ull; |
| 34 | mask |= -(mskb & 0x10) & 0x000000ff00000000ull; |
| 35 | mask |= -(mskb & 0x20) & 0x0000ff0000000000ull; |
| 36 | mask |= -(mskb & 0x40) & 0x00ff000000000000ull; |
| 37 | mask |= -(mskb & 0x80) & 0xff00000000000000ull; |
| 38 | |
| 39 | return val & mask; |
| 40 | } |
| 41 | |
| 42 | uint64_t helper_zap(uint64_t val, uint64_t mask) |
| 43 | { |
| 44 | return helper_zapnot(val, ~mask); |
| 45 | } |
| 46 | |
| 47 | uint64_t helper_cmpbe0(uint64_t a) |
| 48 | { |
| 49 | uint64_t m = 0x7f7f7f7f7f7f7f7fULL; |
| 50 | uint64_t c = ~(((a & m) + m) | a | m); |
| 51 | /* a.......b.......c.......d.......e.......f.......g.......h....... */ |
| 52 | c |= c << 7; |
| 53 | /* ab......bc......cd......de......ef......fg......gh......h....... */ |
| 54 | c |= c << 14; |
| 55 | /* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */ |
| 56 | c |= c << 28; |
| 57 | /* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */ |
| 58 | return c >> 56; |
| 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 | } |