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 } 265