bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 1 | /* |
Blue Swirl | 38de4c4 | 2012-05-12 20:39:26 +0000 | [diff] [blame] | 2 | * x86 condition code helpers |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2008 Fabrice Bellard |
| 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 |
Blue Swirl | 8167ee8 | 2009-07-16 20:47:01 +0000 | [diff] [blame] | 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 18 | */ |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 19 | |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 20 | #define DATA_BITS (1 << (3 + SHIFT)) |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 21 | #define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1)) |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 22 | |
| 23 | #if DATA_BITS == 8 |
| 24 | #define SUFFIX b |
| 25 | #define DATA_TYPE uint8_t |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 26 | #define DATA_MASK 0xff |
| 27 | #elif DATA_BITS == 16 |
| 28 | #define SUFFIX w |
| 29 | #define DATA_TYPE uint16_t |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 30 | #define DATA_MASK 0xffff |
| 31 | #elif DATA_BITS == 32 |
| 32 | #define SUFFIX l |
| 33 | #define DATA_TYPE uint32_t |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 34 | #define DATA_MASK 0xffffffff |
| 35 | #elif DATA_BITS == 64 |
| 36 | #define SUFFIX q |
| 37 | #define DATA_TYPE uint64_t |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 38 | #define DATA_MASK 0xffffffffffffffffULL |
| 39 | #else |
| 40 | #error unhandled operand size |
| 41 | #endif |
| 42 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 43 | /* dynamic flags computation */ |
| 44 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 45 | static int glue(compute_all_add, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 46 | { |
| 47 | int cf, pf, af, zf, sf, of; |
| 48 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 49 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 50 | src1 = CC_SRC; |
| 51 | src2 = CC_DST - CC_SRC; |
| 52 | cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; |
| 53 | pf = parity_table[(uint8_t)CC_DST]; |
| 54 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 55 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 56 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 57 | of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
| 58 | return cf | pf | af | zf | sf | of; |
| 59 | } |
| 60 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 61 | static int glue(compute_c_add, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 62 | { |
| 63 | int cf; |
| 64 | target_long src1; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 65 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 66 | src1 = CC_SRC; |
| 67 | cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; |
| 68 | return cf; |
| 69 | } |
| 70 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 71 | static int glue(compute_all_adc, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 72 | { |
| 73 | int cf, pf, af, zf, sf, of; |
| 74 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 75 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 76 | src1 = CC_SRC; |
| 77 | src2 = CC_DST - CC_SRC - 1; |
| 78 | cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; |
| 79 | pf = parity_table[(uint8_t)CC_DST]; |
| 80 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 81 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 82 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 83 | of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
| 84 | return cf | pf | af | zf | sf | of; |
| 85 | } |
| 86 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 87 | static int glue(compute_c_adc, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 88 | { |
| 89 | int cf; |
| 90 | target_long src1; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 91 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 92 | src1 = CC_SRC; |
| 93 | cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; |
| 94 | return cf; |
| 95 | } |
| 96 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 97 | static int glue(compute_all_sub, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 98 | { |
| 99 | int cf, pf, af, zf, sf, of; |
| 100 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 101 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 102 | src1 = CC_DST + CC_SRC; |
| 103 | src2 = CC_SRC; |
| 104 | cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; |
| 105 | pf = parity_table[(uint8_t)CC_DST]; |
| 106 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 107 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 108 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 109 | of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
| 110 | return cf | pf | af | zf | sf | of; |
| 111 | } |
| 112 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 113 | static int glue(compute_c_sub, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 114 | { |
| 115 | int cf; |
| 116 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 117 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 118 | src1 = CC_DST + CC_SRC; |
| 119 | src2 = CC_SRC; |
| 120 | cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; |
| 121 | return cf; |
| 122 | } |
| 123 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 124 | static int glue(compute_all_sbb, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 125 | { |
| 126 | int cf, pf, af, zf, sf, of; |
| 127 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 128 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 129 | src1 = CC_DST + CC_SRC + 1; |
| 130 | src2 = CC_SRC; |
| 131 | cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; |
| 132 | pf = parity_table[(uint8_t)CC_DST]; |
| 133 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 134 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 135 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 136 | of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
| 137 | return cf | pf | af | zf | sf | of; |
| 138 | } |
| 139 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 140 | static int glue(compute_c_sbb, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 141 | { |
| 142 | int cf; |
| 143 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 144 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 145 | src1 = CC_DST + CC_SRC + 1; |
| 146 | src2 = CC_SRC; |
| 147 | cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; |
| 148 | return cf; |
| 149 | } |
| 150 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 151 | static int glue(compute_all_logic, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 152 | { |
| 153 | int cf, pf, af, zf, sf, of; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 154 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 155 | cf = 0; |
| 156 | pf = parity_table[(uint8_t)CC_DST]; |
| 157 | af = 0; |
| 158 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 159 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 160 | of = 0; |
| 161 | return cf | pf | af | zf | sf | of; |
| 162 | } |
| 163 | |
| 164 | static int glue(compute_c_logic, SUFFIX)(void) |
| 165 | { |
| 166 | return 0; |
| 167 | } |
| 168 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 169 | static int glue(compute_all_inc, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 170 | { |
| 171 | int cf, pf, af, zf, sf, of; |
| 172 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 173 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 174 | src1 = CC_DST - 1; |
| 175 | src2 = 1; |
| 176 | cf = CC_SRC; |
| 177 | pf = parity_table[(uint8_t)CC_DST]; |
| 178 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 179 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 180 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 181 | of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11; |
| 182 | return cf | pf | af | zf | sf | of; |
| 183 | } |
| 184 | |
| 185 | #if DATA_BITS == 32 |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 186 | static int glue(compute_c_inc, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 187 | { |
| 188 | return CC_SRC; |
| 189 | } |
| 190 | #endif |
| 191 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 192 | static int glue(compute_all_dec, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 193 | { |
| 194 | int cf, pf, af, zf, sf, of; |
| 195 | target_long src1, src2; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 196 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 197 | src1 = CC_DST + 1; |
| 198 | src2 = 1; |
| 199 | cf = CC_SRC; |
| 200 | pf = parity_table[(uint8_t)CC_DST]; |
| 201 | af = (CC_DST ^ src1 ^ src2) & 0x10; |
| 202 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 203 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 204 | of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11; |
| 205 | return cf | pf | af | zf | sf | of; |
| 206 | } |
| 207 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 208 | static int glue(compute_all_shl, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 209 | { |
| 210 | int cf, pf, af, zf, sf, of; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 211 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 212 | cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C; |
| 213 | pf = parity_table[(uint8_t)CC_DST]; |
| 214 | af = 0; /* undefined */ |
| 215 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 216 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 217 | /* of is defined if shift count == 1 */ |
| 218 | of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; |
| 219 | return cf | pf | af | zf | sf | of; |
| 220 | } |
| 221 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 222 | static int glue(compute_c_shl, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 223 | { |
| 224 | return (CC_SRC >> (DATA_BITS - 1)) & CC_C; |
| 225 | } |
| 226 | |
| 227 | #if DATA_BITS == 32 |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 228 | static int glue(compute_c_sar, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 229 | { |
| 230 | return CC_SRC & 1; |
| 231 | } |
| 232 | #endif |
| 233 | |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 234 | static int glue(compute_all_sar, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 235 | { |
| 236 | int cf, pf, af, zf, sf, of; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 237 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 238 | cf = CC_SRC & 1; |
| 239 | pf = parity_table[(uint8_t)CC_DST]; |
| 240 | af = 0; /* undefined */ |
| 241 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 242 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 243 | /* of is defined if shift count == 1 */ |
| 244 | of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; |
| 245 | return cf | pf | af | zf | sf | of; |
| 246 | } |
| 247 | |
| 248 | #if DATA_BITS == 32 |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 249 | static int glue(compute_c_mul, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 250 | { |
| 251 | int cf; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 252 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 253 | cf = (CC_SRC != 0); |
| 254 | return cf; |
| 255 | } |
| 256 | #endif |
| 257 | |
| 258 | /* NOTE: we compute the flags like the P4. On olders CPUs, only OF and |
| 259 | CF are modified and it is slower to do that. */ |
Blue Swirl | f0967a1 | 2012-04-29 12:45:34 +0000 | [diff] [blame] | 260 | static int glue(compute_all_mul, SUFFIX)(CPUX86State *env) |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 261 | { |
| 262 | int cf, pf, af, zf, sf, of; |
Blue Swirl | a04759f | 2012-04-29 12:27:33 +0000 | [diff] [blame] | 263 | |
bellard | 07d2c59 | 2008-05-17 13:57:33 +0000 | [diff] [blame] | 264 | cf = (CC_SRC != 0); |
| 265 | pf = parity_table[(uint8_t)CC_DST]; |
| 266 | af = 0; /* undefined */ |
| 267 | zf = ((DATA_TYPE)CC_DST == 0) << 6; |
| 268 | sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
| 269 | of = cf << 11; |
| 270 | return cf | pf | af | zf | sf | of; |
| 271 | } |
| 272 | |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 273 | #undef DATA_BITS |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 274 | #undef SIGN_MASK |
| 275 | #undef DATA_TYPE |
bellard | b6abf97 | 2008-05-17 12:44:31 +0000 | [diff] [blame] | 276 | #undef DATA_MASK |
| 277 | #undef SUFFIX |