| 1 | /* |
| 2 | * PowerPC Decimal Floating Point (DPF) emulation helpers for QEMU. |
| 3 | * |
| 4 | * Copyright (c) 2014 IBM Corporation. |
| 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 | |
| 24 | #define DECNUMDIGITS 34 |
| 25 | #include "libdecnumber/decContext.h" |
| 26 | #include "libdecnumber/decNumber.h" |
| 27 | #include "libdecnumber/dpd/decimal32.h" |
| 28 | #include "libdecnumber/dpd/decimal64.h" |
| 29 | #include "libdecnumber/dpd/decimal128.h" |
| 30 | |
| 31 | |
| 32 | static void get_dfp64(ppc_vsr_t *dst, ppc_fprp_t *dfp) |
| 33 | { |
| 34 | dst->VsrD(1) = dfp->VsrD(0); |
| 35 | } |
| 36 | |
| 37 | static void get_dfp128(ppc_vsr_t *dst, ppc_fprp_t *dfp) |
| 38 | { |
| 39 | dst->VsrD(0) = dfp[0].VsrD(0); |
| 40 | dst->VsrD(1) = dfp[1].VsrD(0); |
| 41 | } |
| 42 | |
| 43 | static void set_dfp64(ppc_fprp_t *dfp, ppc_vsr_t *src) |
| 44 | { |
| 45 | dfp[0].VsrD(0) = src->VsrD(1); |
| 46 | dfp[0].VsrD(1) = 0ULL; |
| 47 | } |
| 48 | |
| 49 | static void set_dfp128(ppc_fprp_t *dfp, ppc_vsr_t *src) |
| 50 | { |
| 51 | dfp[0].VsrD(0) = src->VsrD(0); |
| 52 | dfp[1].VsrD(0) = src->VsrD(1); |
| 53 | dfp[0].VsrD(1) = 0ULL; |
| 54 | dfp[1].VsrD(1) = 0ULL; |
| 55 | } |
| 56 | |
| 57 | static void set_dfp128_to_avr(ppc_avr_t *dst, ppc_vsr_t *src) |
| 58 | { |
| 59 | *dst = *src; |
| 60 | } |
| 61 | |
| 62 | struct PPC_DFP { |
| 63 | CPUPPCState *env; |
| 64 | ppc_vsr_t vt, va, vb; |
| 65 | decNumber t, a, b; |
| 66 | decContext context; |
| 67 | uint8_t crbf; |
| 68 | }; |
| 69 | |
| 70 | static void dfp_prepare_rounding_mode(decContext *context, uint64_t fpscr) |
| 71 | { |
| 72 | enum rounding rnd; |
| 73 | |
| 74 | switch ((fpscr & FP_DRN) >> FPSCR_DRN0) { |
| 75 | case 0: |
| 76 | rnd = DEC_ROUND_HALF_EVEN; |
| 77 | break; |
| 78 | case 1: |
| 79 | rnd = DEC_ROUND_DOWN; |
| 80 | break; |
| 81 | case 2: |
| 82 | rnd = DEC_ROUND_CEILING; |
| 83 | break; |
| 84 | case 3: |
| 85 | rnd = DEC_ROUND_FLOOR; |
| 86 | break; |
| 87 | case 4: |
| 88 | rnd = DEC_ROUND_HALF_UP; |
| 89 | break; |
| 90 | case 5: |
| 91 | rnd = DEC_ROUND_HALF_DOWN; |
| 92 | break; |
| 93 | case 6: |
| 94 | rnd = DEC_ROUND_UP; |
| 95 | break; |
| 96 | case 7: |
| 97 | rnd = DEC_ROUND_05UP; |
| 98 | break; |
| 99 | default: |
| 100 | g_assert_not_reached(); |
| 101 | } |
| 102 | |
| 103 | decContextSetRounding(context, rnd); |
| 104 | } |
| 105 | |
| 106 | static void dfp_set_round_mode_from_immediate(uint8_t r, uint8_t rmc, |
| 107 | struct PPC_DFP *dfp) |
| 108 | { |
| 109 | enum rounding rnd; |
| 110 | if (r == 0) { |
| 111 | switch (rmc & 3) { |
| 112 | case 0: |
| 113 | rnd = DEC_ROUND_HALF_EVEN; |
| 114 | break; |
| 115 | case 1: |
| 116 | rnd = DEC_ROUND_DOWN; |
| 117 | break; |
| 118 | case 2: |
| 119 | rnd = DEC_ROUND_HALF_UP; |
| 120 | break; |
| 121 | case 3: /* use FPSCR rounding mode */ |
| 122 | return; |
| 123 | default: |
| 124 | g_assert_not_reached(); |
| 125 | } |
| 126 | } else { /* r == 1 */ |
| 127 | switch (rmc & 3) { |
| 128 | case 0: |
| 129 | rnd = DEC_ROUND_CEILING; |
| 130 | break; |
| 131 | case 1: |
| 132 | rnd = DEC_ROUND_FLOOR; |
| 133 | break; |
| 134 | case 2: |
| 135 | rnd = DEC_ROUND_UP; |
| 136 | break; |
| 137 | case 3: |
| 138 | rnd = DEC_ROUND_HALF_DOWN; |
| 139 | break; |
| 140 | default: |
| 141 | g_assert_not_reached(); |
| 142 | } |
| 143 | } |
| 144 | decContextSetRounding(&dfp->context, rnd); |
| 145 | } |
| 146 | |
| 147 | static void dfp_prepare_decimal64(struct PPC_DFP *dfp, ppc_fprp_t *a, |
| 148 | ppc_fprp_t *b, CPUPPCState *env) |
| 149 | { |
| 150 | decContextDefault(&dfp->context, DEC_INIT_DECIMAL64); |
| 151 | dfp_prepare_rounding_mode(&dfp->context, env->fpscr); |
| 152 | dfp->env = env; |
| 153 | |
| 154 | if (a) { |
| 155 | get_dfp64(&dfp->va, a); |
| 156 | decimal64ToNumber((decimal64 *)&dfp->va.VsrD(1), &dfp->a); |
| 157 | } else { |
| 158 | dfp->va.VsrD(1) = 0; |
| 159 | decNumberZero(&dfp->a); |
| 160 | } |
| 161 | |
| 162 | if (b) { |
| 163 | get_dfp64(&dfp->vb, b); |
| 164 | decimal64ToNumber((decimal64 *)&dfp->vb.VsrD(1), &dfp->b); |
| 165 | } else { |
| 166 | dfp->vb.VsrD(1) = 0; |
| 167 | decNumberZero(&dfp->b); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | static void dfp_prepare_decimal128(struct PPC_DFP *dfp, ppc_fprp_t *a, |
| 172 | ppc_fprp_t *b, CPUPPCState *env) |
| 173 | { |
| 174 | decContextDefault(&dfp->context, DEC_INIT_DECIMAL128); |
| 175 | dfp_prepare_rounding_mode(&dfp->context, env->fpscr); |
| 176 | dfp->env = env; |
| 177 | |
| 178 | if (a) { |
| 179 | get_dfp128(&dfp->va, a); |
| 180 | decimal128ToNumber((decimal128 *)&dfp->va, &dfp->a); |
| 181 | } else { |
| 182 | dfp->va.VsrD(0) = dfp->va.VsrD(1) = 0; |
| 183 | decNumberZero(&dfp->a); |
| 184 | } |
| 185 | |
| 186 | if (b) { |
| 187 | get_dfp128(&dfp->vb, b); |
| 188 | decimal128ToNumber((decimal128 *)&dfp->vb, &dfp->b); |
| 189 | } else { |
| 190 | dfp->vb.VsrD(0) = dfp->vb.VsrD(1) = 0; |
| 191 | decNumberZero(&dfp->b); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void dfp_finalize_decimal64(struct PPC_DFP *dfp) |
| 196 | { |
| 197 | decimal64FromNumber((decimal64 *)&dfp->vt.VsrD(1), &dfp->t, &dfp->context); |
| 198 | } |
| 199 | |
| 200 | static void dfp_finalize_decimal128(struct PPC_DFP *dfp) |
| 201 | { |
| 202 | decimal128FromNumber((decimal128 *)&dfp->vt, &dfp->t, &dfp->context); |
| 203 | } |
| 204 | |
| 205 | static void dfp_set_FPSCR_flag(struct PPC_DFP *dfp, uint64_t flag, |
| 206 | uint64_t enabled) |
| 207 | { |
| 208 | dfp->env->fpscr |= (flag | FP_FX); |
| 209 | if (dfp->env->fpscr & enabled) { |
| 210 | dfp->env->fpscr |= FP_FEX; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | static void dfp_set_FPRF_from_FRT_with_context(struct PPC_DFP *dfp, |
| 215 | decContext *context) |
| 216 | { |
| 217 | uint64_t fprf = 0; |
| 218 | |
| 219 | /* construct FPRF */ |
| 220 | switch (decNumberClass(&dfp->t, context)) { |
| 221 | case DEC_CLASS_SNAN: |
| 222 | fprf = 0x01; |
| 223 | break; |
| 224 | case DEC_CLASS_QNAN: |
| 225 | fprf = 0x11; |
| 226 | break; |
| 227 | case DEC_CLASS_NEG_INF: |
| 228 | fprf = 0x09; |
| 229 | break; |
| 230 | case DEC_CLASS_NEG_NORMAL: |
| 231 | fprf = 0x08; |
| 232 | break; |
| 233 | case DEC_CLASS_NEG_SUBNORMAL: |
| 234 | fprf = 0x18; |
| 235 | break; |
| 236 | case DEC_CLASS_NEG_ZERO: |
| 237 | fprf = 0x12; |
| 238 | break; |
| 239 | case DEC_CLASS_POS_ZERO: |
| 240 | fprf = 0x02; |
| 241 | break; |
| 242 | case DEC_CLASS_POS_SUBNORMAL: |
| 243 | fprf = 0x14; |
| 244 | break; |
| 245 | case DEC_CLASS_POS_NORMAL: |
| 246 | fprf = 0x04; |
| 247 | break; |
| 248 | case DEC_CLASS_POS_INF: |
| 249 | fprf = 0x05; |
| 250 | break; |
| 251 | default: |
| 252 | g_assert_not_reached(); |
| 253 | } |
| 254 | dfp->env->fpscr &= ~FP_FPRF; |
| 255 | dfp->env->fpscr |= (fprf << FPSCR_FPRF); |
| 256 | } |
| 257 | |
| 258 | static void dfp_set_FPRF_from_FRT(struct PPC_DFP *dfp) |
| 259 | { |
| 260 | dfp_set_FPRF_from_FRT_with_context(dfp, &dfp->context); |
| 261 | } |
| 262 | |
| 263 | static void dfp_set_FPRF_from_FRT_short(struct PPC_DFP *dfp) |
| 264 | { |
| 265 | decContext shortContext; |
| 266 | decContextDefault(&shortContext, DEC_INIT_DECIMAL32); |
| 267 | dfp_set_FPRF_from_FRT_with_context(dfp, &shortContext); |
| 268 | } |
| 269 | |
| 270 | static void dfp_set_FPRF_from_FRT_long(struct PPC_DFP *dfp) |
| 271 | { |
| 272 | decContext longContext; |
| 273 | decContextDefault(&longContext, DEC_INIT_DECIMAL64); |
| 274 | dfp_set_FPRF_from_FRT_with_context(dfp, &longContext); |
| 275 | } |
| 276 | |
| 277 | static void dfp_check_for_OX(struct PPC_DFP *dfp) |
| 278 | { |
| 279 | if (dfp->context.status & DEC_Overflow) { |
| 280 | dfp_set_FPSCR_flag(dfp, FP_OX, FP_OE); |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | static void dfp_check_for_UX(struct PPC_DFP *dfp) |
| 285 | { |
| 286 | if (dfp->context.status & DEC_Underflow) { |
| 287 | dfp_set_FPSCR_flag(dfp, FP_UX, FP_UE); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | static void dfp_check_for_XX(struct PPC_DFP *dfp) |
| 292 | { |
| 293 | if (dfp->context.status & DEC_Inexact) { |
| 294 | dfp_set_FPSCR_flag(dfp, FP_XX | FP_FI, FP_XE); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | static void dfp_check_for_ZX(struct PPC_DFP *dfp) |
| 299 | { |
| 300 | if (dfp->context.status & DEC_Division_by_zero) { |
| 301 | dfp_set_FPSCR_flag(dfp, FP_ZX, FP_ZE); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | static void dfp_check_for_VXSNAN(struct PPC_DFP *dfp) |
| 306 | { |
| 307 | if (dfp->context.status & DEC_Invalid_operation) { |
| 308 | if (decNumberIsSNaN(&dfp->a) || decNumberIsSNaN(&dfp->b)) { |
| 309 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FP_VE); |
| 310 | } |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | static void dfp_check_for_VXSNAN_and_convert_to_QNaN(struct PPC_DFP *dfp) |
| 315 | { |
| 316 | if (decNumberIsSNaN(&dfp->t)) { |
| 317 | dfp->t.bits &= ~DECSNAN; |
| 318 | dfp->t.bits |= DECNAN; |
| 319 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FP_VE); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | static void dfp_check_for_VXISI(struct PPC_DFP *dfp, int testForSameSign) |
| 324 | { |
| 325 | if (dfp->context.status & DEC_Invalid_operation) { |
| 326 | if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) { |
| 327 | int same = decNumberClass(&dfp->a, &dfp->context) == |
| 328 | decNumberClass(&dfp->b, &dfp->context); |
| 329 | if ((same && testForSameSign) || (!same && !testForSameSign)) { |
| 330 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXISI, FP_VE); |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static void dfp_check_for_VXISI_add(struct PPC_DFP *dfp) |
| 337 | { |
| 338 | dfp_check_for_VXISI(dfp, 0); |
| 339 | } |
| 340 | |
| 341 | static void dfp_check_for_VXISI_subtract(struct PPC_DFP *dfp) |
| 342 | { |
| 343 | dfp_check_for_VXISI(dfp, 1); |
| 344 | } |
| 345 | |
| 346 | static void dfp_check_for_VXIMZ(struct PPC_DFP *dfp) |
| 347 | { |
| 348 | if (dfp->context.status & DEC_Invalid_operation) { |
| 349 | if ((decNumberIsInfinite(&dfp->a) && decNumberIsZero(&dfp->b)) || |
| 350 | (decNumberIsInfinite(&dfp->b) && decNumberIsZero(&dfp->a))) { |
| 351 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIMZ, FP_VE); |
| 352 | } |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | static void dfp_check_for_VXZDZ(struct PPC_DFP *dfp) |
| 357 | { |
| 358 | if (dfp->context.status & DEC_Division_undefined) { |
| 359 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXZDZ, FP_VE); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | static void dfp_check_for_VXIDI(struct PPC_DFP *dfp) |
| 364 | { |
| 365 | if (dfp->context.status & DEC_Invalid_operation) { |
| 366 | if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) { |
| 367 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIDI, FP_VE); |
| 368 | } |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | static void dfp_check_for_VXVC(struct PPC_DFP *dfp) |
| 373 | { |
| 374 | if (decNumberIsNaN(&dfp->a) || decNumberIsNaN(&dfp->b)) { |
| 375 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXVC, FP_VE); |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | static void dfp_check_for_VXCVI(struct PPC_DFP *dfp) |
| 380 | { |
| 381 | if ((dfp->context.status & DEC_Invalid_operation) && |
| 382 | (!decNumberIsSNaN(&dfp->a)) && |
| 383 | (!decNumberIsSNaN(&dfp->b))) { |
| 384 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FP_VE); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | static void dfp_set_CRBF_from_T(struct PPC_DFP *dfp) |
| 389 | { |
| 390 | if (decNumberIsNaN(&dfp->t)) { |
| 391 | dfp->crbf = 1; |
| 392 | } else if (decNumberIsZero(&dfp->t)) { |
| 393 | dfp->crbf = 2; |
| 394 | } else if (decNumberIsNegative(&dfp->t)) { |
| 395 | dfp->crbf = 8; |
| 396 | } else { |
| 397 | dfp->crbf = 4; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | static void dfp_set_FPCC_from_CRBF(struct PPC_DFP *dfp) |
| 402 | { |
| 403 | dfp->env->fpscr &= ~FP_FPCC; |
| 404 | dfp->env->fpscr |= (dfp->crbf << FPSCR_FPCC); |
| 405 | } |
| 406 | |
| 407 | static inline void dfp_makeQNaN(decNumber *dn) |
| 408 | { |
| 409 | dn->bits &= ~DECSPECIAL; |
| 410 | dn->bits |= DECNAN; |
| 411 | } |
| 412 | |
| 413 | static inline int dfp_get_digit(decNumber *dn, int n) |
| 414 | { |
| 415 | assert(DECDPUN == 3); |
| 416 | int unit = n / DECDPUN; |
| 417 | int dig = n % DECDPUN; |
| 418 | switch (dig) { |
| 419 | case 0: |
| 420 | return dn->lsu[unit] % 10; |
| 421 | case 1: |
| 422 | return (dn->lsu[unit] / 10) % 10; |
| 423 | case 2: |
| 424 | return dn->lsu[unit] / 100; |
| 425 | } |
| 426 | g_assert_not_reached(); |
| 427 | } |
| 428 | |
| 429 | #define DFP_HELPER_TAB(op, dnop, postprocs, size) \ |
| 430 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \ |
| 431 | ppc_fprp_t *b) \ |
| 432 | { \ |
| 433 | struct PPC_DFP dfp; \ |
| 434 | dfp_prepare_decimal##size(&dfp, a, b, env); \ |
| 435 | dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \ |
| 436 | dfp_finalize_decimal##size(&dfp); \ |
| 437 | postprocs(&dfp); \ |
| 438 | set_dfp##size(t, &dfp.vt); \ |
| 439 | } |
| 440 | |
| 441 | static void ADD_PPs(struct PPC_DFP *dfp) |
| 442 | { |
| 443 | dfp_set_FPRF_from_FRT(dfp); |
| 444 | dfp_check_for_OX(dfp); |
| 445 | dfp_check_for_UX(dfp); |
| 446 | dfp_check_for_XX(dfp); |
| 447 | dfp_check_for_VXSNAN(dfp); |
| 448 | dfp_check_for_VXISI_add(dfp); |
| 449 | } |
| 450 | |
| 451 | DFP_HELPER_TAB(DADD, decNumberAdd, ADD_PPs, 64) |
| 452 | DFP_HELPER_TAB(DADDQ, decNumberAdd, ADD_PPs, 128) |
| 453 | |
| 454 | static void SUB_PPs(struct PPC_DFP *dfp) |
| 455 | { |
| 456 | dfp_set_FPRF_from_FRT(dfp); |
| 457 | dfp_check_for_OX(dfp); |
| 458 | dfp_check_for_UX(dfp); |
| 459 | dfp_check_for_XX(dfp); |
| 460 | dfp_check_for_VXSNAN(dfp); |
| 461 | dfp_check_for_VXISI_subtract(dfp); |
| 462 | } |
| 463 | |
| 464 | DFP_HELPER_TAB(DSUB, decNumberSubtract, SUB_PPs, 64) |
| 465 | DFP_HELPER_TAB(DSUBQ, decNumberSubtract, SUB_PPs, 128) |
| 466 | |
| 467 | static void MUL_PPs(struct PPC_DFP *dfp) |
| 468 | { |
| 469 | dfp_set_FPRF_from_FRT(dfp); |
| 470 | dfp_check_for_OX(dfp); |
| 471 | dfp_check_for_UX(dfp); |
| 472 | dfp_check_for_XX(dfp); |
| 473 | dfp_check_for_VXSNAN(dfp); |
| 474 | dfp_check_for_VXIMZ(dfp); |
| 475 | } |
| 476 | |
| 477 | DFP_HELPER_TAB(DMUL, decNumberMultiply, MUL_PPs, 64) |
| 478 | DFP_HELPER_TAB(DMULQ, decNumberMultiply, MUL_PPs, 128) |
| 479 | |
| 480 | static void DIV_PPs(struct PPC_DFP *dfp) |
| 481 | { |
| 482 | dfp_set_FPRF_from_FRT(dfp); |
| 483 | dfp_check_for_OX(dfp); |
| 484 | dfp_check_for_UX(dfp); |
| 485 | dfp_check_for_ZX(dfp); |
| 486 | dfp_check_for_XX(dfp); |
| 487 | dfp_check_for_VXSNAN(dfp); |
| 488 | dfp_check_for_VXZDZ(dfp); |
| 489 | dfp_check_for_VXIDI(dfp); |
| 490 | } |
| 491 | |
| 492 | DFP_HELPER_TAB(DDIV, decNumberDivide, DIV_PPs, 64) |
| 493 | DFP_HELPER_TAB(DDIVQ, decNumberDivide, DIV_PPs, 128) |
| 494 | |
| 495 | #define DFP_HELPER_BF_AB(op, dnop, postprocs, size) \ |
| 496 | uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \ |
| 497 | { \ |
| 498 | struct PPC_DFP dfp; \ |
| 499 | dfp_prepare_decimal##size(&dfp, a, b, env); \ |
| 500 | dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \ |
| 501 | dfp_finalize_decimal##size(&dfp); \ |
| 502 | postprocs(&dfp); \ |
| 503 | return dfp.crbf; \ |
| 504 | } |
| 505 | |
| 506 | static void CMPU_PPs(struct PPC_DFP *dfp) |
| 507 | { |
| 508 | dfp_set_CRBF_from_T(dfp); |
| 509 | dfp_set_FPCC_from_CRBF(dfp); |
| 510 | dfp_check_for_VXSNAN(dfp); |
| 511 | } |
| 512 | |
| 513 | DFP_HELPER_BF_AB(DCMPU, decNumberCompare, CMPU_PPs, 64) |
| 514 | DFP_HELPER_BF_AB(DCMPUQ, decNumberCompare, CMPU_PPs, 128) |
| 515 | |
| 516 | static void CMPO_PPs(struct PPC_DFP *dfp) |
| 517 | { |
| 518 | dfp_set_CRBF_from_T(dfp); |
| 519 | dfp_set_FPCC_from_CRBF(dfp); |
| 520 | dfp_check_for_VXSNAN(dfp); |
| 521 | dfp_check_for_VXVC(dfp); |
| 522 | } |
| 523 | |
| 524 | DFP_HELPER_BF_AB(DCMPO, decNumberCompare, CMPO_PPs, 64) |
| 525 | DFP_HELPER_BF_AB(DCMPOQ, decNumberCompare, CMPO_PPs, 128) |
| 526 | |
| 527 | #define DFP_HELPER_TSTDC(op, size) \ |
| 528 | uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, uint32_t dcm) \ |
| 529 | { \ |
| 530 | struct PPC_DFP dfp; \ |
| 531 | int match = 0; \ |
| 532 | \ |
| 533 | dfp_prepare_decimal##size(&dfp, a, 0, env); \ |
| 534 | \ |
| 535 | match |= (dcm & 0x20) && decNumberIsZero(&dfp.a); \ |
| 536 | match |= (dcm & 0x10) && decNumberIsSubnormal(&dfp.a, &dfp.context); \ |
| 537 | match |= (dcm & 0x08) && decNumberIsNormal(&dfp.a, &dfp.context); \ |
| 538 | match |= (dcm & 0x04) && decNumberIsInfinite(&dfp.a); \ |
| 539 | match |= (dcm & 0x02) && decNumberIsQNaN(&dfp.a); \ |
| 540 | match |= (dcm & 0x01) && decNumberIsSNaN(&dfp.a); \ |
| 541 | \ |
| 542 | if (decNumberIsNegative(&dfp.a)) { \ |
| 543 | dfp.crbf = match ? 0xA : 0x8; \ |
| 544 | } else { \ |
| 545 | dfp.crbf = match ? 0x2 : 0x0; \ |
| 546 | } \ |
| 547 | \ |
| 548 | dfp_set_FPCC_from_CRBF(&dfp); \ |
| 549 | return dfp.crbf; \ |
| 550 | } |
| 551 | |
| 552 | DFP_HELPER_TSTDC(DTSTDC, 64) |
| 553 | DFP_HELPER_TSTDC(DTSTDCQ, 128) |
| 554 | |
| 555 | #define DFP_HELPER_TSTDG(op, size) \ |
| 556 | uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, uint32_t dcm) \ |
| 557 | { \ |
| 558 | struct PPC_DFP dfp; \ |
| 559 | int minexp, maxexp, nzero_digits, nzero_idx, is_negative, is_zero, \ |
| 560 | is_extreme_exp, is_subnormal, is_normal, leftmost_is_nonzero, \ |
| 561 | match; \ |
| 562 | \ |
| 563 | dfp_prepare_decimal##size(&dfp, a, 0, env); \ |
| 564 | \ |
| 565 | if ((size) == 64) { \ |
| 566 | minexp = -398; \ |
| 567 | maxexp = 369; \ |
| 568 | nzero_digits = 16; \ |
| 569 | nzero_idx = 5; \ |
| 570 | } else if ((size) == 128) { \ |
| 571 | minexp = -6176; \ |
| 572 | maxexp = 6111; \ |
| 573 | nzero_digits = 34; \ |
| 574 | nzero_idx = 11; \ |
| 575 | } \ |
| 576 | \ |
| 577 | is_negative = decNumberIsNegative(&dfp.a); \ |
| 578 | is_zero = decNumberIsZero(&dfp.a); \ |
| 579 | is_extreme_exp = (dfp.a.exponent == maxexp) || \ |
| 580 | (dfp.a.exponent == minexp); \ |
| 581 | is_subnormal = decNumberIsSubnormal(&dfp.a, &dfp.context); \ |
| 582 | is_normal = decNumberIsNormal(&dfp.a, &dfp.context); \ |
| 583 | leftmost_is_nonzero = (dfp.a.digits == nzero_digits) && \ |
| 584 | (dfp.a.lsu[nzero_idx] != 0); \ |
| 585 | match = 0; \ |
| 586 | \ |
| 587 | match |= (dcm & 0x20) && is_zero && !is_extreme_exp; \ |
| 588 | match |= (dcm & 0x10) && is_zero && is_extreme_exp; \ |
| 589 | match |= (dcm & 0x08) && \ |
| 590 | (is_subnormal || (is_normal && is_extreme_exp)); \ |
| 591 | match |= (dcm & 0x04) && is_normal && !is_extreme_exp && \ |
| 592 | !leftmost_is_nonzero; \ |
| 593 | match |= (dcm & 0x02) && is_normal && !is_extreme_exp && \ |
| 594 | leftmost_is_nonzero; \ |
| 595 | match |= (dcm & 0x01) && decNumberIsSpecial(&dfp.a); \ |
| 596 | \ |
| 597 | if (is_negative) { \ |
| 598 | dfp.crbf = match ? 0xA : 0x8; \ |
| 599 | } else { \ |
| 600 | dfp.crbf = match ? 0x2 : 0x0; \ |
| 601 | } \ |
| 602 | \ |
| 603 | dfp_set_FPCC_from_CRBF(&dfp); \ |
| 604 | return dfp.crbf; \ |
| 605 | } |
| 606 | |
| 607 | DFP_HELPER_TSTDG(DTSTDG, 64) |
| 608 | DFP_HELPER_TSTDG(DTSTDGQ, 128) |
| 609 | |
| 610 | #define DFP_HELPER_TSTEX(op, size) \ |
| 611 | uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \ |
| 612 | { \ |
| 613 | struct PPC_DFP dfp; \ |
| 614 | int expa, expb, a_is_special, b_is_special; \ |
| 615 | \ |
| 616 | dfp_prepare_decimal##size(&dfp, a, b, env); \ |
| 617 | \ |
| 618 | expa = dfp.a.exponent; \ |
| 619 | expb = dfp.b.exponent; \ |
| 620 | a_is_special = decNumberIsSpecial(&dfp.a); \ |
| 621 | b_is_special = decNumberIsSpecial(&dfp.b); \ |
| 622 | \ |
| 623 | if (a_is_special || b_is_special) { \ |
| 624 | int atype = a_is_special ? (decNumberIsNaN(&dfp.a) ? 4 : 2) : 1; \ |
| 625 | int btype = b_is_special ? (decNumberIsNaN(&dfp.b) ? 4 : 2) : 1; \ |
| 626 | dfp.crbf = (atype ^ btype) ? 0x1 : 0x2; \ |
| 627 | } else if (expa < expb) { \ |
| 628 | dfp.crbf = 0x8; \ |
| 629 | } else if (expa > expb) { \ |
| 630 | dfp.crbf = 0x4; \ |
| 631 | } else { \ |
| 632 | dfp.crbf = 0x2; \ |
| 633 | } \ |
| 634 | \ |
| 635 | dfp_set_FPCC_from_CRBF(&dfp); \ |
| 636 | return dfp.crbf; \ |
| 637 | } |
| 638 | |
| 639 | DFP_HELPER_TSTEX(DTSTEX, 64) |
| 640 | DFP_HELPER_TSTEX(DTSTEXQ, 128) |
| 641 | |
| 642 | #define DFP_HELPER_TSTSF(op, size) \ |
| 643 | uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \ |
| 644 | { \ |
| 645 | struct PPC_DFP dfp; \ |
| 646 | unsigned k; \ |
| 647 | ppc_vsr_t va; \ |
| 648 | \ |
| 649 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 650 | \ |
| 651 | get_dfp64(&va, a); \ |
| 652 | k = va.VsrD(1) & 0x3F; \ |
| 653 | \ |
| 654 | if (unlikely(decNumberIsSpecial(&dfp.b))) { \ |
| 655 | dfp.crbf = 1; \ |
| 656 | } else if (k == 0) { \ |
| 657 | dfp.crbf = 4; \ |
| 658 | } else if (unlikely(decNumberIsZero(&dfp.b))) { \ |
| 659 | /* Zero has no sig digits */ \ |
| 660 | dfp.crbf = 4; \ |
| 661 | } else { \ |
| 662 | unsigned nsd = dfp.b.digits; \ |
| 663 | if (k < nsd) { \ |
| 664 | dfp.crbf = 8; \ |
| 665 | } else if (k > nsd) { \ |
| 666 | dfp.crbf = 4; \ |
| 667 | } else { \ |
| 668 | dfp.crbf = 2; \ |
| 669 | } \ |
| 670 | } \ |
| 671 | \ |
| 672 | dfp_set_FPCC_from_CRBF(&dfp); \ |
| 673 | return dfp.crbf; \ |
| 674 | } |
| 675 | |
| 676 | DFP_HELPER_TSTSF(DTSTSF, 64) |
| 677 | DFP_HELPER_TSTSF(DTSTSFQ, 128) |
| 678 | |
| 679 | #define DFP_HELPER_TSTSFI(op, size) \ |
| 680 | uint32_t helper_##op(CPUPPCState *env, uint32_t a, ppc_fprp_t *b) \ |
| 681 | { \ |
| 682 | struct PPC_DFP dfp; \ |
| 683 | unsigned uim; \ |
| 684 | \ |
| 685 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 686 | \ |
| 687 | uim = a & 0x3F; \ |
| 688 | \ |
| 689 | if (unlikely(decNumberIsSpecial(&dfp.b))) { \ |
| 690 | dfp.crbf = 1; \ |
| 691 | } else if (uim == 0) { \ |
| 692 | dfp.crbf = 4; \ |
| 693 | } else if (unlikely(decNumberIsZero(&dfp.b))) { \ |
| 694 | /* Zero has no sig digits */ \ |
| 695 | dfp.crbf = 4; \ |
| 696 | } else { \ |
| 697 | unsigned nsd = dfp.b.digits; \ |
| 698 | if (uim < nsd) { \ |
| 699 | dfp.crbf = 8; \ |
| 700 | } else if (uim > nsd) { \ |
| 701 | dfp.crbf = 4; \ |
| 702 | } else { \ |
| 703 | dfp.crbf = 2; \ |
| 704 | } \ |
| 705 | } \ |
| 706 | \ |
| 707 | dfp_set_FPCC_from_CRBF(&dfp); \ |
| 708 | return dfp.crbf; \ |
| 709 | } |
| 710 | |
| 711 | DFP_HELPER_TSTSFI(DTSTSFI, 64) |
| 712 | DFP_HELPER_TSTSFI(DTSTSFIQ, 128) |
| 713 | |
| 714 | static void QUA_PPs(struct PPC_DFP *dfp) |
| 715 | { |
| 716 | dfp_set_FPRF_from_FRT(dfp); |
| 717 | dfp_check_for_XX(dfp); |
| 718 | dfp_check_for_VXSNAN(dfp); |
| 719 | dfp_check_for_VXCVI(dfp); |
| 720 | } |
| 721 | |
| 722 | static void dfp_quantize(uint8_t rmc, struct PPC_DFP *dfp) |
| 723 | { |
| 724 | dfp_set_round_mode_from_immediate(0, rmc, dfp); |
| 725 | decNumberQuantize(&dfp->t, &dfp->b, &dfp->a, &dfp->context); |
| 726 | if (decNumberIsSNaN(&dfp->a)) { |
| 727 | dfp->t = dfp->a; |
| 728 | dfp_makeQNaN(&dfp->t); |
| 729 | } else if (decNumberIsSNaN(&dfp->b)) { |
| 730 | dfp->t = dfp->b; |
| 731 | dfp_makeQNaN(&dfp->t); |
| 732 | } else if (decNumberIsQNaN(&dfp->a)) { |
| 733 | dfp->t = dfp->a; |
| 734 | } else if (decNumberIsQNaN(&dfp->b)) { |
| 735 | dfp->t = dfp->b; |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | #define DFP_HELPER_QUAI(op, size) \ |
| 740 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \ |
| 741 | uint32_t te, uint32_t rmc) \ |
| 742 | { \ |
| 743 | struct PPC_DFP dfp; \ |
| 744 | \ |
| 745 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 746 | \ |
| 747 | decNumberFromUInt32(&dfp.a, 1); \ |
| 748 | dfp.a.exponent = (int32_t)((int8_t)(te << 3) >> 3); \ |
| 749 | \ |
| 750 | dfp_quantize(rmc, &dfp); \ |
| 751 | dfp_finalize_decimal##size(&dfp); \ |
| 752 | QUA_PPs(&dfp); \ |
| 753 | \ |
| 754 | set_dfp##size(t, &dfp.vt); \ |
| 755 | } |
| 756 | |
| 757 | DFP_HELPER_QUAI(DQUAI, 64) |
| 758 | DFP_HELPER_QUAI(DQUAIQ, 128) |
| 759 | |
| 760 | #define DFP_HELPER_QUA(op, size) \ |
| 761 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \ |
| 762 | ppc_fprp_t *b, uint32_t rmc) \ |
| 763 | { \ |
| 764 | struct PPC_DFP dfp; \ |
| 765 | \ |
| 766 | dfp_prepare_decimal##size(&dfp, a, b, env); \ |
| 767 | \ |
| 768 | dfp_quantize(rmc, &dfp); \ |
| 769 | dfp_finalize_decimal##size(&dfp); \ |
| 770 | QUA_PPs(&dfp); \ |
| 771 | \ |
| 772 | set_dfp##size(t, &dfp.vt); \ |
| 773 | } |
| 774 | |
| 775 | DFP_HELPER_QUA(DQUA, 64) |
| 776 | DFP_HELPER_QUA(DQUAQ, 128) |
| 777 | |
| 778 | static void _dfp_reround(uint8_t rmc, int32_t ref_sig, int32_t xmax, |
| 779 | struct PPC_DFP *dfp) |
| 780 | { |
| 781 | int msd_orig, msd_rslt; |
| 782 | |
| 783 | if (unlikely((ref_sig == 0) || (dfp->b.digits <= ref_sig))) { |
| 784 | dfp->t = dfp->b; |
| 785 | if (decNumberIsSNaN(&dfp->b)) { |
| 786 | dfp_makeQNaN(&dfp->t); |
| 787 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FPSCR_VE); |
| 788 | } |
| 789 | return; |
| 790 | } |
| 791 | |
| 792 | /* Reround is equivalent to quantizing b with 1**E(n) where */ |
| 793 | /* n = exp(b) + numDigits(b) - reference_significance. */ |
| 794 | |
| 795 | decNumberFromUInt32(&dfp->a, 1); |
| 796 | dfp->a.exponent = dfp->b.exponent + dfp->b.digits - ref_sig; |
| 797 | |
| 798 | if (unlikely(dfp->a.exponent > xmax)) { |
| 799 | dfp->t.digits = 0; |
| 800 | dfp->t.bits &= ~DECNEG; |
| 801 | dfp_makeQNaN(&dfp->t); |
| 802 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE); |
| 803 | return; |
| 804 | } |
| 805 | |
| 806 | dfp_quantize(rmc, dfp); |
| 807 | |
| 808 | msd_orig = dfp_get_digit(&dfp->b, dfp->b.digits-1); |
| 809 | msd_rslt = dfp_get_digit(&dfp->t, dfp->t.digits-1); |
| 810 | |
| 811 | /* If the quantization resulted in rounding up to the next magnitude, */ |
| 812 | /* then we need to shift the significand and adjust the exponent. */ |
| 813 | |
| 814 | if (unlikely((msd_orig == 9) && (msd_rslt == 1))) { |
| 815 | |
| 816 | decNumber negone; |
| 817 | |
| 818 | decNumberFromInt32(&negone, -1); |
| 819 | decNumberShift(&dfp->t, &dfp->t, &negone, &dfp->context); |
| 820 | dfp->t.exponent++; |
| 821 | |
| 822 | if (unlikely(dfp->t.exponent > xmax)) { |
| 823 | dfp_makeQNaN(&dfp->t); |
| 824 | dfp->t.digits = 0; |
| 825 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FP_VE); |
| 826 | /* Inhibit XX in this case */ |
| 827 | decContextClearStatus(&dfp->context, DEC_Inexact); |
| 828 | } |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | #define DFP_HELPER_RRND(op, size) \ |
| 833 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \ |
| 834 | ppc_fprp_t *b, uint32_t rmc) \ |
| 835 | { \ |
| 836 | struct PPC_DFP dfp; \ |
| 837 | ppc_vsr_t va; \ |
| 838 | int32_t ref_sig; \ |
| 839 | int32_t xmax = ((size) == 64) ? 369 : 6111; \ |
| 840 | \ |
| 841 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 842 | \ |
| 843 | get_dfp64(&va, a); \ |
| 844 | ref_sig = va.VsrD(1) & 0x3f; \ |
| 845 | \ |
| 846 | _dfp_reround(rmc, ref_sig, xmax, &dfp); \ |
| 847 | dfp_finalize_decimal##size(&dfp); \ |
| 848 | QUA_PPs(&dfp); \ |
| 849 | \ |
| 850 | set_dfp##size(t, &dfp.vt); \ |
| 851 | } |
| 852 | |
| 853 | DFP_HELPER_RRND(DRRND, 64) |
| 854 | DFP_HELPER_RRND(DRRNDQ, 128) |
| 855 | |
| 856 | #define DFP_HELPER_RINT(op, postprocs, size) \ |
| 857 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \ |
| 858 | uint32_t r, uint32_t rmc) \ |
| 859 | { \ |
| 860 | struct PPC_DFP dfp; \ |
| 861 | \ |
| 862 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 863 | \ |
| 864 | dfp_set_round_mode_from_immediate(r, rmc, &dfp); \ |
| 865 | decNumberToIntegralExact(&dfp.t, &dfp.b, &dfp.context); \ |
| 866 | dfp_finalize_decimal##size(&dfp); \ |
| 867 | postprocs(&dfp); \ |
| 868 | \ |
| 869 | set_dfp##size(t, &dfp.vt); \ |
| 870 | } |
| 871 | |
| 872 | static void RINTX_PPs(struct PPC_DFP *dfp) |
| 873 | { |
| 874 | dfp_set_FPRF_from_FRT(dfp); |
| 875 | dfp_check_for_XX(dfp); |
| 876 | dfp_check_for_VXSNAN(dfp); |
| 877 | } |
| 878 | |
| 879 | DFP_HELPER_RINT(DRINTX, RINTX_PPs, 64) |
| 880 | DFP_HELPER_RINT(DRINTXQ, RINTX_PPs, 128) |
| 881 | |
| 882 | static void RINTN_PPs(struct PPC_DFP *dfp) |
| 883 | { |
| 884 | dfp_set_FPRF_from_FRT(dfp); |
| 885 | dfp_check_for_VXSNAN(dfp); |
| 886 | } |
| 887 | |
| 888 | DFP_HELPER_RINT(DRINTN, RINTN_PPs, 64) |
| 889 | DFP_HELPER_RINT(DRINTNQ, RINTN_PPs, 128) |
| 890 | |
| 891 | void helper_DCTDP(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) |
| 892 | { |
| 893 | struct PPC_DFP dfp; |
| 894 | ppc_vsr_t vb; |
| 895 | uint32_t b_short; |
| 896 | |
| 897 | get_dfp64(&vb, b); |
| 898 | b_short = (uint32_t)vb.VsrD(1); |
| 899 | |
| 900 | dfp_prepare_decimal64(&dfp, 0, 0, env); |
| 901 | decimal32ToNumber((decimal32 *)&b_short, &dfp.t); |
| 902 | dfp_finalize_decimal64(&dfp); |
| 903 | set_dfp64(t, &dfp.vt); |
| 904 | dfp_set_FPRF_from_FRT(&dfp); |
| 905 | } |
| 906 | |
| 907 | void helper_DCTQPQ(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) |
| 908 | { |
| 909 | struct PPC_DFP dfp; |
| 910 | ppc_vsr_t vb; |
| 911 | dfp_prepare_decimal128(&dfp, 0, 0, env); |
| 912 | get_dfp64(&vb, b); |
| 913 | decimal64ToNumber((decimal64 *)&vb.VsrD(1), &dfp.t); |
| 914 | |
| 915 | dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp); |
| 916 | dfp_set_FPRF_from_FRT(&dfp); |
| 917 | |
| 918 | dfp_finalize_decimal128(&dfp); |
| 919 | set_dfp128(t, &dfp.vt); |
| 920 | } |
| 921 | |
| 922 | void helper_DRSP(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) |
| 923 | { |
| 924 | struct PPC_DFP dfp; |
| 925 | uint32_t t_short = 0; |
| 926 | ppc_vsr_t vt; |
| 927 | dfp_prepare_decimal64(&dfp, 0, b, env); |
| 928 | decimal32FromNumber((decimal32 *)&t_short, &dfp.b, &dfp.context); |
| 929 | decimal32ToNumber((decimal32 *)&t_short, &dfp.t); |
| 930 | |
| 931 | dfp_set_FPRF_from_FRT_short(&dfp); |
| 932 | dfp_check_for_OX(&dfp); |
| 933 | dfp_check_for_UX(&dfp); |
| 934 | dfp_check_for_XX(&dfp); |
| 935 | |
| 936 | vt.VsrD(1) = (uint64_t)t_short; |
| 937 | set_dfp64(t, &vt); |
| 938 | } |
| 939 | |
| 940 | void helper_DRDPQ(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) |
| 941 | { |
| 942 | struct PPC_DFP dfp; |
| 943 | dfp_prepare_decimal128(&dfp, 0, b, env); |
| 944 | decimal64FromNumber((decimal64 *)&dfp.vt.VsrD(1), &dfp.b, &dfp.context); |
| 945 | decimal64ToNumber((decimal64 *)&dfp.vt.VsrD(1), &dfp.t); |
| 946 | |
| 947 | dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp); |
| 948 | dfp_set_FPRF_from_FRT_long(&dfp); |
| 949 | dfp_check_for_OX(&dfp); |
| 950 | dfp_check_for_UX(&dfp); |
| 951 | dfp_check_for_XX(&dfp); |
| 952 | |
| 953 | dfp.vt.VsrD(0) = dfp.vt.VsrD(1) = 0; |
| 954 | dfp_finalize_decimal64(&dfp); |
| 955 | set_dfp128(t, &dfp.vt); |
| 956 | } |
| 957 | |
| 958 | #define DFP_HELPER_CFFIX(op, size) \ |
| 959 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \ |
| 960 | { \ |
| 961 | struct PPC_DFP dfp; \ |
| 962 | ppc_vsr_t vb; \ |
| 963 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 964 | get_dfp64(&vb, b); \ |
| 965 | decNumberFromInt64(&dfp.t, (int64_t)vb.VsrD(1)); \ |
| 966 | dfp_finalize_decimal##size(&dfp); \ |
| 967 | CFFIX_PPs(&dfp); \ |
| 968 | \ |
| 969 | set_dfp##size(t, &dfp.vt); \ |
| 970 | } |
| 971 | |
| 972 | static void CFFIX_PPs(struct PPC_DFP *dfp) |
| 973 | { |
| 974 | dfp_set_FPRF_from_FRT(dfp); |
| 975 | dfp_check_for_XX(dfp); |
| 976 | } |
| 977 | |
| 978 | DFP_HELPER_CFFIX(DCFFIX, 64) |
| 979 | DFP_HELPER_CFFIX(DCFFIXQ, 128) |
| 980 | |
| 981 | void helper_DCFFIXQQ(CPUPPCState *env, ppc_fprp_t *t, ppc_avr_t *b) |
| 982 | { |
| 983 | struct PPC_DFP dfp; |
| 984 | |
| 985 | dfp_prepare_decimal128(&dfp, NULL, NULL, env); |
| 986 | decNumberFromInt128(&dfp.t, (uint64_t)b->VsrD(1), (int64_t)b->VsrD(0)); |
| 987 | dfp_finalize_decimal128(&dfp); |
| 988 | CFFIX_PPs(&dfp); |
| 989 | |
| 990 | set_dfp128(t, &dfp.vt); |
| 991 | } |
| 992 | |
| 993 | #define DFP_HELPER_CTFIX(op, size) \ |
| 994 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \ |
| 995 | { \ |
| 996 | struct PPC_DFP dfp; \ |
| 997 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 998 | \ |
| 999 | if (unlikely(decNumberIsSpecial(&dfp.b))) { \ |
| 1000 | uint64_t invalid_flags = FP_VX | FP_VXCVI; \ |
| 1001 | if (decNumberIsInfinite(&dfp.b)) { \ |
| 1002 | dfp.vt.VsrD(1) = decNumberIsNegative(&dfp.b) ? INT64_MIN : \ |
| 1003 | INT64_MAX; \ |
| 1004 | } else { /* NaN */ \ |
| 1005 | dfp.vt.VsrD(1) = INT64_MIN; \ |
| 1006 | if (decNumberIsSNaN(&dfp.b)) { \ |
| 1007 | invalid_flags |= FP_VXSNAN; \ |
| 1008 | } \ |
| 1009 | } \ |
| 1010 | dfp_set_FPSCR_flag(&dfp, invalid_flags, FP_VE); \ |
| 1011 | } else if (unlikely(decNumberIsZero(&dfp.b))) { \ |
| 1012 | dfp.vt.VsrD(1) = 0; \ |
| 1013 | } else { \ |
| 1014 | decNumberToIntegralExact(&dfp.b, &dfp.b, &dfp.context); \ |
| 1015 | dfp.vt.VsrD(1) = decNumberIntegralToInt64(&dfp.b, &dfp.context); \ |
| 1016 | if (decContextTestStatus(&dfp.context, DEC_Invalid_operation)) { \ |
| 1017 | dfp.vt.VsrD(1) = decNumberIsNegative(&dfp.b) ? INT64_MIN : \ |
| 1018 | INT64_MAX; \ |
| 1019 | dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FP_VE); \ |
| 1020 | } else { \ |
| 1021 | dfp_check_for_XX(&dfp); \ |
| 1022 | } \ |
| 1023 | } \ |
| 1024 | \ |
| 1025 | set_dfp64(t, &dfp.vt); \ |
| 1026 | } |
| 1027 | |
| 1028 | DFP_HELPER_CTFIX(DCTFIX, 64) |
| 1029 | DFP_HELPER_CTFIX(DCTFIXQ, 128) |
| 1030 | |
| 1031 | void helper_DCTFIXQQ(CPUPPCState *env, ppc_avr_t *t, ppc_fprp_t *b) |
| 1032 | { |
| 1033 | struct PPC_DFP dfp; |
| 1034 | dfp_prepare_decimal128(&dfp, 0, b, env); |
| 1035 | |
| 1036 | if (unlikely(decNumberIsSpecial(&dfp.b))) { |
| 1037 | uint64_t invalid_flags = FP_VX | FP_VXCVI; |
| 1038 | if (decNumberIsInfinite(&dfp.b)) { |
| 1039 | if (decNumberIsNegative(&dfp.b)) { |
| 1040 | dfp.vt.VsrD(0) = INT64_MIN; |
| 1041 | dfp.vt.VsrD(1) = 0; |
| 1042 | } else { |
| 1043 | dfp.vt.VsrD(0) = INT64_MAX; |
| 1044 | dfp.vt.VsrD(1) = UINT64_MAX; |
| 1045 | } |
| 1046 | } else { /* NaN */ |
| 1047 | dfp.vt.VsrD(0) = INT64_MIN; |
| 1048 | dfp.vt.VsrD(1) = 0; |
| 1049 | if (decNumberIsSNaN(&dfp.b)) { |
| 1050 | invalid_flags |= FP_VXSNAN; |
| 1051 | } |
| 1052 | } |
| 1053 | dfp_set_FPSCR_flag(&dfp, invalid_flags, FP_VE); |
| 1054 | } else if (unlikely(decNumberIsZero(&dfp.b))) { |
| 1055 | dfp.vt.VsrD(0) = 0; |
| 1056 | dfp.vt.VsrD(1) = 0; |
| 1057 | } else { |
| 1058 | decNumberToIntegralExact(&dfp.b, &dfp.b, &dfp.context); |
| 1059 | decNumberIntegralToInt128(&dfp.b, &dfp.context, |
| 1060 | &dfp.vt.VsrD(1), &dfp.vt.VsrD(0)); |
| 1061 | if (decContextTestStatus(&dfp.context, DEC_Invalid_operation)) { |
| 1062 | if (decNumberIsNegative(&dfp.b)) { |
| 1063 | dfp.vt.VsrD(0) = INT64_MIN; |
| 1064 | dfp.vt.VsrD(1) = 0; |
| 1065 | } else { |
| 1066 | dfp.vt.VsrD(0) = INT64_MAX; |
| 1067 | dfp.vt.VsrD(1) = UINT64_MAX; |
| 1068 | } |
| 1069 | dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FP_VE); |
| 1070 | } else { |
| 1071 | dfp_check_for_XX(&dfp); |
| 1072 | } |
| 1073 | } |
| 1074 | |
| 1075 | set_dfp128_to_avr(t, &dfp.vt); |
| 1076 | } |
| 1077 | |
| 1078 | static inline void dfp_set_bcd_digit_64(ppc_vsr_t *t, uint8_t digit, |
| 1079 | unsigned n) |
| 1080 | { |
| 1081 | t->VsrD(1) |= ((uint64_t)(digit & 0xF) << (n << 2)); |
| 1082 | } |
| 1083 | |
| 1084 | static inline void dfp_set_bcd_digit_128(ppc_vsr_t *t, uint8_t digit, |
| 1085 | unsigned n) |
| 1086 | { |
| 1087 | t->VsrD((n & 0x10) ? 0 : 1) |= |
| 1088 | ((uint64_t)(digit & 0xF) << ((n & 15) << 2)); |
| 1089 | } |
| 1090 | |
| 1091 | static inline void dfp_set_sign_64(ppc_vsr_t *t, uint8_t sgn) |
| 1092 | { |
| 1093 | t->VsrD(1) <<= 4; |
| 1094 | t->VsrD(1) |= (sgn & 0xF); |
| 1095 | } |
| 1096 | |
| 1097 | static inline void dfp_set_sign_128(ppc_vsr_t *t, uint8_t sgn) |
| 1098 | { |
| 1099 | t->VsrD(0) <<= 4; |
| 1100 | t->VsrD(0) |= (t->VsrD(1) >> 60); |
| 1101 | t->VsrD(1) <<= 4; |
| 1102 | t->VsrD(1) |= (sgn & 0xF); |
| 1103 | } |
| 1104 | |
| 1105 | #define DFP_HELPER_DEDPD(op, size) \ |
| 1106 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \ |
| 1107 | uint32_t sp) \ |
| 1108 | { \ |
| 1109 | struct PPC_DFP dfp; \ |
| 1110 | uint8_t digits[34]; \ |
| 1111 | int i, N; \ |
| 1112 | \ |
| 1113 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 1114 | \ |
| 1115 | decNumberGetBCD(&dfp.b, digits); \ |
| 1116 | dfp.vt.VsrD(0) = dfp.vt.VsrD(1) = 0; \ |
| 1117 | N = dfp.b.digits; \ |
| 1118 | \ |
| 1119 | for (i = 0; (i < N) && (i < (size)/4); i++) { \ |
| 1120 | dfp_set_bcd_digit_##size(&dfp.vt, digits[N - i - 1], i); \ |
| 1121 | } \ |
| 1122 | \ |
| 1123 | if (sp & 2) { \ |
| 1124 | uint8_t sgn; \ |
| 1125 | \ |
| 1126 | if (decNumberIsNegative(&dfp.b)) { \ |
| 1127 | sgn = 0xD; \ |
| 1128 | } else { \ |
| 1129 | sgn = ((sp & 1) ? 0xF : 0xC); \ |
| 1130 | } \ |
| 1131 | dfp_set_sign_##size(&dfp.vt, sgn); \ |
| 1132 | } \ |
| 1133 | \ |
| 1134 | set_dfp##size(t, &dfp.vt); \ |
| 1135 | } |
| 1136 | |
| 1137 | DFP_HELPER_DEDPD(DDEDPD, 64) |
| 1138 | DFP_HELPER_DEDPD(DDEDPDQ, 128) |
| 1139 | |
| 1140 | static inline uint8_t dfp_get_bcd_digit_64(ppc_vsr_t *t, unsigned n) |
| 1141 | { |
| 1142 | return t->VsrD(1) >> ((n << 2) & 63) & 15; |
| 1143 | } |
| 1144 | |
| 1145 | static inline uint8_t dfp_get_bcd_digit_128(ppc_vsr_t *t, unsigned n) |
| 1146 | { |
| 1147 | return t->VsrD((n & 0x10) ? 0 : 1) >> ((n << 2) & 63) & 15; |
| 1148 | } |
| 1149 | |
| 1150 | static inline void dfp_invalid_op_vxcvi_64(struct PPC_DFP *dfp) |
| 1151 | { |
| 1152 | /* TODO: fpscr is incorrectly not being saved to env */ |
| 1153 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE); |
| 1154 | if ((dfp->env->fpscr & FP_VE) == 0) { |
| 1155 | dfp->vt.VsrD(1) = 0x7c00000000000000; /* QNaN */ |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | |
| 1160 | static inline void dfp_invalid_op_vxcvi_128(struct PPC_DFP *dfp) |
| 1161 | { |
| 1162 | /* TODO: fpscr is incorrectly not being saved to env */ |
| 1163 | dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE); |
| 1164 | if ((dfp->env->fpscr & FP_VE) == 0) { |
| 1165 | dfp->vt.VsrD(0) = 0x7c00000000000000; /* QNaN */ |
| 1166 | dfp->vt.VsrD(1) = 0x0; |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | #define DFP_HELPER_ENBCD(op, size) \ |
| 1171 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \ |
| 1172 | uint32_t s) \ |
| 1173 | { \ |
| 1174 | struct PPC_DFP dfp; \ |
| 1175 | uint8_t digits[32]; \ |
| 1176 | int n = 0, offset = 0, sgn = 0, nonzero = 0; \ |
| 1177 | \ |
| 1178 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 1179 | \ |
| 1180 | decNumberZero(&dfp.t); \ |
| 1181 | \ |
| 1182 | if (s) { \ |
| 1183 | uint8_t sgnNibble = dfp_get_bcd_digit_##size(&dfp.vb, offset++); \ |
| 1184 | switch (sgnNibble) { \ |
| 1185 | case 0xD: \ |
| 1186 | case 0xB: \ |
| 1187 | sgn = 1; \ |
| 1188 | break; \ |
| 1189 | case 0xC: \ |
| 1190 | case 0xF: \ |
| 1191 | case 0xA: \ |
| 1192 | case 0xE: \ |
| 1193 | sgn = 0; \ |
| 1194 | break; \ |
| 1195 | default: \ |
| 1196 | dfp_invalid_op_vxcvi_##size(&dfp); \ |
| 1197 | set_dfp##size(t, &dfp.vt); \ |
| 1198 | return; \ |
| 1199 | } \ |
| 1200 | } \ |
| 1201 | \ |
| 1202 | while (offset < (size) / 4) { \ |
| 1203 | n++; \ |
| 1204 | digits[(size) / 4 - n] = dfp_get_bcd_digit_##size(&dfp.vb, \ |
| 1205 | offset++); \ |
| 1206 | if (digits[(size) / 4 - n] > 10) { \ |
| 1207 | dfp_invalid_op_vxcvi_##size(&dfp); \ |
| 1208 | set_dfp##size(t, &dfp.vt); \ |
| 1209 | return; \ |
| 1210 | } else { \ |
| 1211 | nonzero |= (digits[(size) / 4 - n] > 0); \ |
| 1212 | } \ |
| 1213 | } \ |
| 1214 | \ |
| 1215 | if (nonzero) { \ |
| 1216 | decNumberSetBCD(&dfp.t, digits + ((size) / 4) - n, n); \ |
| 1217 | } \ |
| 1218 | \ |
| 1219 | if (s && sgn) { \ |
| 1220 | dfp.t.bits |= DECNEG; \ |
| 1221 | } \ |
| 1222 | dfp_finalize_decimal##size(&dfp); \ |
| 1223 | dfp_set_FPRF_from_FRT(&dfp); \ |
| 1224 | set_dfp##size(t, &dfp.vt); \ |
| 1225 | } |
| 1226 | |
| 1227 | DFP_HELPER_ENBCD(DENBCD, 64) |
| 1228 | DFP_HELPER_ENBCD(DENBCDQ, 128) |
| 1229 | |
| 1230 | #define DFP_HELPER_XEX(op, size) \ |
| 1231 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \ |
| 1232 | { \ |
| 1233 | struct PPC_DFP dfp; \ |
| 1234 | ppc_vsr_t vt; \ |
| 1235 | \ |
| 1236 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 1237 | \ |
| 1238 | if (unlikely(decNumberIsSpecial(&dfp.b))) { \ |
| 1239 | if (decNumberIsInfinite(&dfp.b)) { \ |
| 1240 | vt.VsrD(1) = -1; \ |
| 1241 | } else if (decNumberIsSNaN(&dfp.b)) { \ |
| 1242 | vt.VsrD(1) = -3; \ |
| 1243 | } else if (decNumberIsQNaN(&dfp.b)) { \ |
| 1244 | vt.VsrD(1) = -2; \ |
| 1245 | } else { \ |
| 1246 | g_assert_not_reached(); \ |
| 1247 | } \ |
| 1248 | set_dfp64(t, &vt); \ |
| 1249 | } else { \ |
| 1250 | if ((size) == 64) { \ |
| 1251 | vt.VsrD(1) = dfp.b.exponent + 398; \ |
| 1252 | } else if ((size) == 128) { \ |
| 1253 | vt.VsrD(1) = dfp.b.exponent + 6176; \ |
| 1254 | } else { \ |
| 1255 | g_assert_not_reached(); \ |
| 1256 | } \ |
| 1257 | set_dfp64(t, &vt); \ |
| 1258 | } \ |
| 1259 | } |
| 1260 | |
| 1261 | DFP_HELPER_XEX(DXEX, 64) |
| 1262 | DFP_HELPER_XEX(DXEXQ, 128) |
| 1263 | |
| 1264 | static void dfp_set_raw_exp_64(ppc_vsr_t *t, uint64_t raw) |
| 1265 | { |
| 1266 | t->VsrD(1) &= 0x8003ffffffffffffULL; |
| 1267 | t->VsrD(1) |= (raw << (63 - 13)); |
| 1268 | } |
| 1269 | |
| 1270 | static void dfp_set_raw_exp_128(ppc_vsr_t *t, uint64_t raw) |
| 1271 | { |
| 1272 | t->VsrD(0) &= 0x80003fffffffffffULL; |
| 1273 | t->VsrD(0) |= (raw << (63 - 17)); |
| 1274 | } |
| 1275 | |
| 1276 | #define DFP_HELPER_IEX(op, size) \ |
| 1277 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \ |
| 1278 | ppc_fprp_t *b) \ |
| 1279 | { \ |
| 1280 | struct PPC_DFP dfp; \ |
| 1281 | uint64_t raw_qnan, raw_snan, raw_inf, max_exp; \ |
| 1282 | ppc_vsr_t va; \ |
| 1283 | int bias; \ |
| 1284 | int64_t exp; \ |
| 1285 | \ |
| 1286 | get_dfp64(&va, a); \ |
| 1287 | exp = (int64_t)va.VsrD(1); \ |
| 1288 | dfp_prepare_decimal##size(&dfp, 0, b, env); \ |
| 1289 | \ |
| 1290 | if ((size) == 64) { \ |
| 1291 | max_exp = 767; \ |
| 1292 | raw_qnan = 0x1F00; \ |
| 1293 | raw_snan = 0x1F80; \ |
| 1294 | raw_inf = 0x1E00; \ |
| 1295 | bias = 398; \ |
| 1296 | } else if ((size) == 128) { \ |
| 1297 | max_exp = 12287; \ |
| 1298 | raw_qnan = 0x1f000; \ |
| 1299 | raw_snan = 0x1f800; \ |
| 1300 | raw_inf = 0x1e000; \ |
| 1301 | bias = 6176; \ |
| 1302 | } else { \ |
| 1303 | g_assert_not_reached(); \ |
| 1304 | } \ |
| 1305 | \ |
| 1306 | if (unlikely((exp < 0) || (exp > max_exp))) { \ |
| 1307 | dfp.vt.VsrD(0) = dfp.vb.VsrD(0); \ |
| 1308 | dfp.vt.VsrD(1) = dfp.vb.VsrD(1); \ |
| 1309 | if (exp == -1) { \ |
| 1310 | dfp_set_raw_exp_##size(&dfp.vt, raw_inf); \ |
| 1311 | } else if (exp == -3) { \ |
| 1312 | dfp_set_raw_exp_##size(&dfp.vt, raw_snan); \ |
| 1313 | } else { \ |
| 1314 | dfp_set_raw_exp_##size(&dfp.vt, raw_qnan); \ |
| 1315 | } \ |
| 1316 | } else { \ |
| 1317 | dfp.t = dfp.b; \ |
| 1318 | if (unlikely(decNumberIsSpecial(&dfp.t))) { \ |
| 1319 | dfp.t.bits &= ~DECSPECIAL; \ |
| 1320 | } \ |
| 1321 | dfp.t.exponent = exp - bias; \ |
| 1322 | dfp_finalize_decimal##size(&dfp); \ |
| 1323 | } \ |
| 1324 | set_dfp##size(t, &dfp.vt); \ |
| 1325 | } |
| 1326 | |
| 1327 | DFP_HELPER_IEX(DIEX, 64) |
| 1328 | DFP_HELPER_IEX(DIEXQ, 128) |
| 1329 | |
| 1330 | static void dfp_clear_lmd_from_g5msb(uint64_t *t) |
| 1331 | { |
| 1332 | |
| 1333 | /* The most significant 5 bits of the PowerPC DFP format combine bits */ |
| 1334 | /* from the left-most decimal digit (LMD) and the biased exponent. */ |
| 1335 | /* This routine clears the LMD bits while preserving the exponent */ |
| 1336 | /* bits. See "Figure 80: Encoding of bits 0:4 of the G field for */ |
| 1337 | /* Finite Numbers" in the Power ISA for additional details. */ |
| 1338 | |
| 1339 | uint64_t g5msb = (*t >> 58) & 0x1F; |
| 1340 | |
| 1341 | if ((g5msb >> 3) < 3) { /* LMD in [0-7] ? */ |
| 1342 | *t &= ~(7ULL << 58); |
| 1343 | } else { |
| 1344 | switch (g5msb & 7) { |
| 1345 | case 0: |
| 1346 | case 1: |
| 1347 | g5msb = 0; |
| 1348 | break; |
| 1349 | case 2: |
| 1350 | case 3: |
| 1351 | g5msb = 0x8; |
| 1352 | break; |
| 1353 | case 4: |
| 1354 | case 5: |
| 1355 | g5msb = 0x10; |
| 1356 | break; |
| 1357 | case 6: |
| 1358 | g5msb = 0x1E; |
| 1359 | break; |
| 1360 | case 7: |
| 1361 | g5msb = 0x1F; |
| 1362 | break; |
| 1363 | } |
| 1364 | |
| 1365 | *t &= ~(0x1fULL << 58); |
| 1366 | *t |= (g5msb << 58); |
| 1367 | } |
| 1368 | } |
| 1369 | |
| 1370 | #define DFP_HELPER_SHIFT(op, size, shift_left) \ |
| 1371 | void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \ |
| 1372 | uint32_t sh) \ |
| 1373 | { \ |
| 1374 | struct PPC_DFP dfp; \ |
| 1375 | unsigned max_digits = ((size) == 64) ? 16 : 34; \ |
| 1376 | \ |
| 1377 | dfp_prepare_decimal##size(&dfp, a, 0, env); \ |
| 1378 | \ |
| 1379 | if (sh <= max_digits) { \ |
| 1380 | \ |
| 1381 | decNumber shd; \ |
| 1382 | unsigned special = dfp.a.bits & DECSPECIAL; \ |
| 1383 | \ |
| 1384 | if (shift_left) { \ |
| 1385 | decNumberFromUInt32(&shd, sh); \ |
| 1386 | } else { \ |
| 1387 | decNumberFromInt32(&shd, -((int32_t)sh)); \ |
| 1388 | } \ |
| 1389 | \ |
| 1390 | dfp.a.bits &= ~DECSPECIAL; \ |
| 1391 | decNumberShift(&dfp.t, &dfp.a, &shd, &dfp.context); \ |
| 1392 | \ |
| 1393 | dfp.t.bits |= special; \ |
| 1394 | if (special && (dfp.t.digits >= max_digits)) { \ |
| 1395 | dfp.t.digits = max_digits - 1; \ |
| 1396 | } \ |
| 1397 | \ |
| 1398 | dfp_finalize_decimal##size(&dfp); \ |
| 1399 | } else { \ |
| 1400 | if ((size) == 64) { \ |
| 1401 | dfp.vt.VsrD(1) = dfp.va.VsrD(1) & \ |
| 1402 | 0xFFFC000000000000ULL; \ |
| 1403 | dfp_clear_lmd_from_g5msb(&dfp.vt.VsrD(1)); \ |
| 1404 | } else { \ |
| 1405 | dfp.vt.VsrD(0) = dfp.va.VsrD(0) & \ |
| 1406 | 0xFFFFC00000000000ULL; \ |
| 1407 | dfp_clear_lmd_from_g5msb(&dfp.vt.VsrD(0)); \ |
| 1408 | dfp.vt.VsrD(1) = 0; \ |
| 1409 | } \ |
| 1410 | } \ |
| 1411 | \ |
| 1412 | set_dfp##size(t, &dfp.vt); \ |
| 1413 | } |
| 1414 | |
| 1415 | DFP_HELPER_SHIFT(DSCLI, 64, 1) |
| 1416 | DFP_HELPER_SHIFT(DSCLIQ, 128, 1) |
| 1417 | DFP_HELPER_SHIFT(DSCRI, 64, 0) |
| 1418 | DFP_HELPER_SHIFT(DSCRIQ, 128, 0) |
| 1419 | |
| 1420 | target_ulong helper_CDTBCD(target_ulong s) |
| 1421 | { |
| 1422 | uint64_t res = 0; |
| 1423 | uint32_t dec32, declets; |
| 1424 | uint8_t bcd[6]; |
| 1425 | int i, w, sh; |
| 1426 | decNumber a; |
| 1427 | |
| 1428 | for (w = 1; w >= 0; w--) { |
| 1429 | res <<= 32; |
| 1430 | declets = extract64(s, 32 * w, 20); |
| 1431 | if (declets) { |
| 1432 | /* decimal32 with zero exponent and word "w" declets */ |
| 1433 | dec32 = (0x225ULL << 20) | declets; |
| 1434 | decimal32ToNumber((decimal32 *)&dec32, &a); |
| 1435 | decNumberGetBCD(&a, bcd); |
| 1436 | for (i = 0; i < a.digits; i++) { |
| 1437 | sh = 4 * (a.digits - 1 - i); |
| 1438 | res |= (uint64_t)bcd[i] << sh; |
| 1439 | } |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | return res; |
| 1444 | } |
| 1445 | |
| 1446 | target_ulong helper_CBCDTD(target_ulong s) |
| 1447 | { |
| 1448 | uint64_t res = 0; |
| 1449 | uint32_t dec32; |
| 1450 | uint8_t bcd[6]; |
| 1451 | int w, i, offs; |
| 1452 | decNumber a; |
| 1453 | decContext context; |
| 1454 | |
| 1455 | decContextDefault(&context, DEC_INIT_DECIMAL32); |
| 1456 | |
| 1457 | for (w = 1; w >= 0; w--) { |
| 1458 | res <<= 32; |
| 1459 | decNumberZero(&a); |
| 1460 | /* Extract each BCD field of word "w" */ |
| 1461 | for (i = 5; i >= 0; i--) { |
| 1462 | offs = 4 * (5 - i) + 32 * w; |
| 1463 | bcd[i] = extract64(s, offs, 4); |
| 1464 | if (bcd[i] > 9) { |
| 1465 | /* |
| 1466 | * If the field value is greater than 9, the results are |
| 1467 | * undefined. We could use a fixed value like 0 or 9, but |
| 1468 | * an and with 9 seems to better match the hardware behavior. |
| 1469 | */ |
| 1470 | bcd[i] &= 9; |
| 1471 | } |
| 1472 | } |
| 1473 | |
| 1474 | /* Create a decNumber with the BCD values and convert to decimal32 */ |
| 1475 | decNumberSetBCD(&a, bcd, 6); |
| 1476 | decimal32FromNumber((decimal32 *)&dec32, &a, &context); |
| 1477 | |
| 1478 | /* Extract the two declets from the decimal32 value */ |
| 1479 | res |= dec32 & 0xfffff; |
| 1480 | } |
| 1481 | |
| 1482 | return res; |
| 1483 | } |