sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1 | /* -*- mode: C; c-basic-offset: 3; -*- */ |
| 2 | |
| 3 | /*---------------------------------------------------------------*/ |
| 4 | /*--- begin host_s390_isel.c ---*/ |
| 5 | /*---------------------------------------------------------------*/ |
| 6 | |
| 7 | /* |
| 8 | This file is part of Valgrind, a dynamic binary instrumentation |
| 9 | framework. |
| 10 | |
| 11 | Copyright IBM Corp. 2010-2011 |
| 12 | |
| 13 | This program is free software; you can redistribute it and/or |
| 14 | modify it under the terms of the GNU General Public License as |
| 15 | published by the Free Software Foundation; either version 2 of the |
| 16 | License, or (at your option) any later version. |
| 17 | |
| 18 | This program is distributed in the hope that it will be useful, but |
| 19 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with this program; if not, write to the Free Software |
| 25 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 26 | 02110-1301, USA. |
| 27 | |
| 28 | The GNU General Public License is contained in the file COPYING. |
| 29 | */ |
| 30 | |
| 31 | /* Contributed by Florian Krohm */ |
| 32 | |
| 33 | #include "libvex_basictypes.h" |
| 34 | #include "libvex_ir.h" |
| 35 | #include "libvex.h" |
| 36 | #include "libvex_s390x_common.h" |
| 37 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 38 | #include "main_util.h" |
| 39 | #include "main_globals.h" |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 40 | #include "guest_s390_defs.h" /* guest_s390x_state_requires_precise_mem_exns */ |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 41 | #include "host_generic_regs.h" |
| 42 | #include "host_s390_defs.h" |
| 43 | |
| 44 | /*---------------------------------------------------------*/ |
| 45 | /*--- ISelEnv ---*/ |
| 46 | /*---------------------------------------------------------*/ |
| 47 | |
| 48 | /* This carries around: |
| 49 | |
| 50 | - A mapping from IRTemp to IRType, giving the type of any IRTemp we |
| 51 | might encounter. This is computed before insn selection starts, |
| 52 | and does not change. |
| 53 | |
| 54 | - A mapping from IRTemp to HReg. This tells the insn selector |
| 55 | which virtual register(s) are associated with each IRTemp |
| 56 | temporary. This is computed before insn selection starts, and |
| 57 | does not change. We expect this mapping to map precisely the |
| 58 | same set of IRTemps as the type mapping does. |
| 59 | |
| 60 | - vregmap holds the primary register for the IRTemp. |
| 61 | - vregmapHI holds the secondary register for the IRTemp, |
| 62 | if any is needed. That's only for Ity_I64 temps |
| 63 | in 32 bit mode or Ity_I128 temps in 64-bit mode. |
| 64 | |
| 65 | - The code array, that is, the insns selected so far. |
| 66 | |
| 67 | - A counter, for generating new virtual registers. |
| 68 | |
| 69 | - The host subarchitecture we are selecting insns for. |
| 70 | This is set at the start and does not change. |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 71 | |
| 72 | - A flag to indicate whether the guest IA has been assigned to. |
| 73 | |
| 74 | - Values of certain guest registers which are often assigned constants. |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 75 | */ |
| 76 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 77 | /* Symbolic names for guest registers whose value we're tracking */ |
| 78 | enum { |
| 79 | GUEST_IA, |
| 80 | GUEST_CC_OP, |
| 81 | GUEST_CC_DEP1, |
| 82 | GUEST_CC_DEP2, |
| 83 | GUEST_CC_NDEP, |
| 84 | GUEST_SYSNO, |
| 85 | GUEST_UNKNOWN /* must be the last entry */ |
| 86 | }; |
| 87 | |
| 88 | /* Number of registers we're tracking. */ |
| 89 | #define NUM_TRACKED_REGS GUEST_UNKNOWN |
| 90 | |
| 91 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 92 | typedef struct { |
| 93 | IRTypeEnv *type_env; |
| 94 | |
| 95 | HReg *vregmap; |
| 96 | HReg *vregmapHI; |
| 97 | UInt n_vregmap; |
| 98 | |
| 99 | HInstrArray *code; |
| 100 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 101 | ULong old_value[NUM_TRACKED_REGS]; |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 102 | UInt vreg_ctr; |
| 103 | |
| 104 | UInt hwcaps; |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 105 | Bool first_IA_assignment; |
| 106 | Bool old_value_valid[NUM_TRACKED_REGS]; |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 107 | } ISelEnv; |
| 108 | |
| 109 | |
| 110 | /* Forward declarations */ |
| 111 | static HReg s390_isel_int_expr(ISelEnv *, IRExpr *); |
| 112 | static s390_amode *s390_isel_amode(ISelEnv *, IRExpr *); |
| 113 | static s390_cc_t s390_isel_cc(ISelEnv *, IRExpr *); |
| 114 | static s390_opnd_RMI s390_isel_int_expr_RMI(ISelEnv *, IRExpr *); |
| 115 | static void s390_isel_int128_expr(HReg *, HReg *, ISelEnv *, IRExpr *); |
| 116 | static HReg s390_isel_float_expr(ISelEnv *, IRExpr *); |
| 117 | static void s390_isel_float128_expr(HReg *, HReg *, ISelEnv *, IRExpr *); |
| 118 | |
| 119 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 120 | static Int |
| 121 | get_guest_reg(Int offset) |
| 122 | { |
| 123 | switch (offset) { |
florian | 428dfdd | 2012-03-27 03:09:49 +0000 | [diff] [blame^] | 124 | case S390X_GUEST_OFFSET(guest_IA): return GUEST_IA; |
| 125 | case S390X_GUEST_OFFSET(guest_CC_OP): return GUEST_CC_OP; |
| 126 | case S390X_GUEST_OFFSET(guest_CC_DEP1): return GUEST_CC_DEP1; |
| 127 | case S390X_GUEST_OFFSET(guest_CC_DEP2): return GUEST_CC_DEP2; |
| 128 | case S390X_GUEST_OFFSET(guest_CC_NDEP): return GUEST_CC_NDEP; |
| 129 | case S390X_GUEST_OFFSET(guest_SYSNO): return GUEST_SYSNO; |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 130 | |
| 131 | /* Also make sure there is never a partial write to one of |
| 132 | these registers. That would complicate matters. */ |
florian | 428dfdd | 2012-03-27 03:09:49 +0000 | [diff] [blame^] | 133 | case S390X_GUEST_OFFSET(guest_IA)+1 ... S390X_GUEST_OFFSET(guest_IA)+7: |
| 134 | case S390X_GUEST_OFFSET(guest_CC_OP)+1 ... S390X_GUEST_OFFSET(guest_CC_OP)+7: |
| 135 | case S390X_GUEST_OFFSET(guest_CC_DEP1)+1 ... S390X_GUEST_OFFSET(guest_CC_DEP1)+7: |
| 136 | case S390X_GUEST_OFFSET(guest_CC_DEP2)+1 ... S390X_GUEST_OFFSET(guest_CC_DEP2)+7: |
| 137 | case S390X_GUEST_OFFSET(guest_CC_NDEP)+1 ... S390X_GUEST_OFFSET(guest_CC_NDEP)+7: |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 138 | vassert("partial update of this guest state register is not allowed"); |
| 139 | break; |
| 140 | |
| 141 | default: break; |
| 142 | } |
| 143 | |
| 144 | return GUEST_UNKNOWN; |
| 145 | } |
| 146 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 147 | /* Add an instruction */ |
| 148 | static void |
| 149 | addInstr(ISelEnv *env, s390_insn *insn) |
| 150 | { |
| 151 | addHInstr(env->code, insn); |
| 152 | |
| 153 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 154 | vex_printf("%s\n", s390_insn_as_string(insn)); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | |
| 159 | static __inline__ IRExpr * |
| 160 | mkU64(ULong value) |
| 161 | { |
| 162 | return IRExpr_Const(IRConst_U64(value)); |
| 163 | } |
| 164 | |
| 165 | |
| 166 | /*---------------------------------------------------------*/ |
| 167 | /*--- Registers ---*/ |
| 168 | /*---------------------------------------------------------*/ |
| 169 | |
| 170 | /* Return the virtual register to which a given IRTemp is mapped. */ |
| 171 | static HReg |
| 172 | lookupIRTemp(ISelEnv *env, IRTemp tmp) |
| 173 | { |
| 174 | vassert(tmp < env->n_vregmap); |
| 175 | vassert(env->vregmap[tmp] != INVALID_HREG); |
| 176 | |
| 177 | return env->vregmap[tmp]; |
| 178 | } |
| 179 | |
| 180 | |
| 181 | /* Return the two virtual registers to which the IRTemp is mapped. */ |
| 182 | static void |
| 183 | lookupIRTemp128(HReg *hi, HReg *lo, ISelEnv *env, IRTemp tmp) |
| 184 | { |
| 185 | vassert(tmp < env->n_vregmap); |
| 186 | vassert(env->vregmapHI[tmp] != INVALID_HREG); |
| 187 | |
| 188 | *lo = env->vregmap[tmp]; |
| 189 | *hi = env->vregmapHI[tmp]; |
| 190 | } |
| 191 | |
| 192 | |
| 193 | /* Allocate a new integer register */ |
| 194 | static HReg |
| 195 | newVRegI(ISelEnv *env) |
| 196 | { |
| 197 | HReg reg = mkHReg(env->vreg_ctr, HRcInt64, True /* virtual */ ); |
| 198 | env->vreg_ctr++; |
| 199 | |
| 200 | return reg; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /* Allocate a new floating point register */ |
| 205 | static HReg |
| 206 | newVRegF(ISelEnv *env) |
| 207 | { |
| 208 | HReg reg = mkHReg(env->vreg_ctr, HRcFlt64, True /* virtual */ ); |
| 209 | |
| 210 | env->vreg_ctr++; |
| 211 | |
| 212 | return reg; |
| 213 | } |
| 214 | |
| 215 | |
| 216 | /* Construct a non-virtual general purpose register */ |
| 217 | static __inline__ HReg |
| 218 | make_gpr(ISelEnv *env, UInt regno) |
| 219 | { |
| 220 | return mkHReg(regno, HRcInt64, False /* virtual */ ); |
| 221 | } |
| 222 | |
| 223 | |
| 224 | /* Construct a non-virtual floating point register */ |
| 225 | static __inline__ HReg |
| 226 | make_fpr(UInt regno) |
| 227 | { |
| 228 | return mkHReg(regno, HRcFlt64, False /* virtual */ ); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | /*---------------------------------------------------------*/ |
| 233 | /*--- Amode ---*/ |
| 234 | /*---------------------------------------------------------*/ |
| 235 | |
| 236 | static __inline__ Bool |
| 237 | ulong_fits_unsigned_12bit(ULong val) |
| 238 | { |
| 239 | return (val & 0xFFFu) == val; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | static __inline__ Bool |
| 244 | ulong_fits_signed_20bit(ULong val) |
| 245 | { |
| 246 | Long v = val & 0xFFFFFu; |
| 247 | |
| 248 | v = (v << 44) >> 44; /* sign extend */ |
| 249 | |
| 250 | return val == (ULong)v; |
| 251 | } |
| 252 | |
| 253 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 254 | static __inline__ Bool |
| 255 | ulong_fits_signed_8bit(ULong val) |
| 256 | { |
| 257 | Long v = val & 0xFFu; |
| 258 | |
| 259 | v = (v << 56) >> 56; /* sign extend */ |
| 260 | |
| 261 | return val == (ULong)v; |
| 262 | } |
| 263 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 264 | /* EXPR is an expression that is used as an address. Return an s390_amode |
| 265 | for it. */ |
| 266 | static s390_amode * |
| 267 | s390_isel_amode_wrk(ISelEnv *env, IRExpr *expr) |
| 268 | { |
| 269 | if (expr->tag == Iex_Binop && expr->Iex.Binop.op == Iop_Add64) { |
| 270 | IRExpr *arg1 = expr->Iex.Binop.arg1; |
| 271 | IRExpr *arg2 = expr->Iex.Binop.arg2; |
| 272 | |
| 273 | /* Move constant into right subtree */ |
| 274 | if (arg1->tag == Iex_Const) { |
| 275 | IRExpr *tmp; |
| 276 | tmp = arg1; |
| 277 | arg1 = arg2; |
| 278 | arg2 = tmp; |
| 279 | } |
| 280 | |
| 281 | /* r + constant: Check for b12 first, then b20 */ |
| 282 | if (arg2->tag == Iex_Const && arg2->Iex.Const.con->tag == Ico_U64) { |
| 283 | ULong value = arg2->Iex.Const.con->Ico.U64; |
| 284 | |
| 285 | if (ulong_fits_unsigned_12bit(value)) { |
| 286 | return s390_amode_b12((Int)value, s390_isel_int_expr(env, arg1)); |
| 287 | } |
sewardj | 652b56a | 2011-04-13 15:38:17 +0000 | [diff] [blame] | 288 | /* If long-displacement is not available, do not construct B20 or |
| 289 | BX20 amodes because code generation cannot handle them. */ |
| 290 | if (s390_host_has_ldisp && ulong_fits_signed_20bit(value)) { |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 291 | return s390_amode_b20((Int)value, s390_isel_int_expr(env, arg1)); |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* Doesn't match anything in particular. Generate it into |
| 297 | a register and use that. */ |
| 298 | return s390_amode_b12(0, s390_isel_int_expr(env, expr)); |
| 299 | } |
| 300 | |
| 301 | |
| 302 | static s390_amode * |
| 303 | s390_isel_amode(ISelEnv *env, IRExpr *expr) |
| 304 | { |
florian | 35da861 | 2011-06-25 02:25:41 +0000 | [diff] [blame] | 305 | s390_amode *am; |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 306 | |
| 307 | /* Address computation should yield a 64-bit value */ |
| 308 | vassert(typeOfIRExpr(env->type_env, expr) == Ity_I64); |
| 309 | |
| 310 | am = s390_isel_amode_wrk(env, expr); |
| 311 | |
| 312 | /* Check post-condition */ |
| 313 | vassert(s390_amode_is_sane(am)); |
| 314 | |
| 315 | return am; |
| 316 | } |
| 317 | |
| 318 | |
| 319 | /*---------------------------------------------------------*/ |
| 320 | /*--- Helper functions ---*/ |
| 321 | /*---------------------------------------------------------*/ |
| 322 | |
| 323 | /* Constants and memory accesses should be right operands */ |
| 324 | #define order_commutative_operands(left, right) \ |
| 325 | do { \ |
| 326 | if (left->tag == Iex_Const || left->tag == Iex_Load || \ |
| 327 | left->tag == Iex_Get) { \ |
| 328 | IRExpr *tmp; \ |
| 329 | tmp = left; \ |
| 330 | left = right; \ |
| 331 | right = tmp; \ |
| 332 | } \ |
| 333 | } while (0) |
| 334 | |
| 335 | |
| 336 | /* Copy an RMI operand to the DST register */ |
| 337 | static s390_insn * |
| 338 | s390_opnd_copy(UChar size, HReg dst, s390_opnd_RMI opnd) |
| 339 | { |
| 340 | switch (opnd.tag) { |
| 341 | case S390_OPND_AMODE: |
| 342 | return s390_insn_load(size, dst, opnd.variant.am); |
| 343 | |
| 344 | case S390_OPND_REG: |
| 345 | return s390_insn_move(size, dst, opnd.variant.reg); |
| 346 | |
| 347 | case S390_OPND_IMMEDIATE: |
| 348 | return s390_insn_load_immediate(size, dst, opnd.variant.imm); |
| 349 | |
| 350 | default: |
| 351 | vpanic("s390_opnd_copy"); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | |
| 356 | /* Construct a RMI operand for a register */ |
| 357 | static __inline__ s390_opnd_RMI |
| 358 | s390_opnd_reg(HReg reg) |
| 359 | { |
| 360 | s390_opnd_RMI opnd; |
| 361 | |
| 362 | opnd.tag = S390_OPND_REG; |
| 363 | opnd.variant.reg = reg; |
| 364 | |
| 365 | return opnd; |
| 366 | } |
| 367 | |
| 368 | |
| 369 | /* Construct a RMI operand for an immediate constant */ |
| 370 | static __inline__ s390_opnd_RMI |
| 371 | s390_opnd_imm(ULong value) |
| 372 | { |
| 373 | s390_opnd_RMI opnd; |
| 374 | |
| 375 | opnd.tag = S390_OPND_IMMEDIATE; |
| 376 | opnd.variant.imm = value; |
| 377 | |
| 378 | return opnd; |
| 379 | } |
| 380 | |
| 381 | |
| 382 | /* Return 1, if EXPR represents the cosntant 0 */ |
| 383 | static int |
| 384 | s390_expr_is_const_zero(IRExpr *expr) |
| 385 | { |
| 386 | ULong value; |
| 387 | |
| 388 | if (expr->tag == Iex_Const) { |
| 389 | switch (expr->Iex.Const.con->tag) { |
| 390 | case Ico_U1: value = expr->Iex.Const.con->Ico.U1; break; |
| 391 | case Ico_U8: value = expr->Iex.Const.con->Ico.U8; break; |
| 392 | case Ico_U16: value = expr->Iex.Const.con->Ico.U16; break; |
| 393 | case Ico_U32: value = expr->Iex.Const.con->Ico.U32; break; |
| 394 | case Ico_U64: value = expr->Iex.Const.con->Ico.U64; break; |
| 395 | default: |
| 396 | vpanic("s390_expr_is_const_zero"); |
| 397 | } |
| 398 | return value == 0; |
| 399 | } |
| 400 | |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | |
| 405 | /* Call a helper (clean or dirty) |
| 406 | Arguments must satisfy the following conditions: |
| 407 | (a) they are expressions yielding an integer result |
| 408 | (b) there can be no more than S390_NUM_GPRPARMS arguments |
| 409 | guard is a Ity_Bit expression indicating whether or not the |
| 410 | call happens. If guard==NULL, the call is unconditional. |
| 411 | */ |
| 412 | static void |
| 413 | doHelperCall(ISelEnv *env, Bool passBBP, IRExpr *guard, |
| 414 | IRCallee *callee, IRExpr **args) |
| 415 | { |
| 416 | UInt n_args, i, argreg, size; |
| 417 | ULong target; |
| 418 | HReg tmpregs[S390_NUM_GPRPARMS]; |
| 419 | s390_cc_t cc; |
| 420 | |
| 421 | n_args = 0; |
| 422 | for (i = 0; args[i]; i++) |
| 423 | ++n_args; |
| 424 | |
| 425 | if (n_args > (S390_NUM_GPRPARMS - (passBBP ? 1 : 0))) { |
| 426 | vpanic("doHelperCall: too many arguments"); |
| 427 | } |
| 428 | |
| 429 | /* This is the "slow scheme". fixs390: implement the fast one */ |
| 430 | argreg = 0; |
| 431 | |
| 432 | /* If we need the guest state pointer put it in a temporary arg reg */ |
| 433 | if (passBBP) { |
| 434 | tmpregs[argreg] = newVRegI(env); |
| 435 | addInstr(env, s390_insn_move(sizeof(ULong), tmpregs[argreg], |
| 436 | s390_hreg_guest_state_pointer())); |
| 437 | argreg++; |
| 438 | } |
| 439 | |
| 440 | /* Compute the function arguments into a temporary register each */ |
| 441 | for (i = 0; i < n_args; i++) { |
| 442 | tmpregs[argreg] = s390_isel_int_expr(env, args[i]); |
| 443 | argreg++; |
| 444 | } |
| 445 | |
| 446 | /* Compute the condition */ |
| 447 | cc = S390_CC_ALWAYS; |
| 448 | if (guard) { |
| 449 | if (guard->tag == Iex_Const |
| 450 | && guard->Iex.Const.con->tag == Ico_U1 |
| 451 | && guard->Iex.Const.con->Ico.U1 == True) { |
| 452 | /* unconditional -- do nothing */ |
| 453 | } else { |
| 454 | cc = s390_isel_cc(env, guard); |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* Move the args to the final register */ |
| 459 | for (i = 0; i < argreg; i++) { |
| 460 | HReg finalreg; |
| 461 | |
| 462 | finalreg = mkHReg(s390_gprno_from_arg_index(i), HRcInt64, False); |
| 463 | size = sizeofIRType(Ity_I64); |
| 464 | addInstr(env, s390_insn_move(size, finalreg, tmpregs[i])); |
| 465 | } |
| 466 | |
| 467 | target = Ptr_to_ULong(callee->addr); |
| 468 | |
| 469 | /* Finally, the call itself. */ |
| 470 | addInstr(env, s390_insn_helper_call(cc, (Addr64)target, n_args, |
| 471 | callee->name)); |
| 472 | } |
| 473 | |
| 474 | |
| 475 | /* Given an expression representing a rounding mode using IRRoundingMode |
| 476 | encoding convert it to an s390_round_t value. */ |
| 477 | static s390_round_t |
| 478 | decode_rounding_mode(IRExpr *rounding_expr) |
| 479 | { |
| 480 | if (rounding_expr->tag == Iex_Const && |
| 481 | rounding_expr->Iex.Const.con->tag == Ico_U32) { |
| 482 | IRRoundingMode mode = rounding_expr->Iex.Const.con->Ico.U32; |
| 483 | |
| 484 | switch (mode) { |
| 485 | case Irrm_NEAREST: return S390_ROUND_NEAREST_EVEN; |
| 486 | case Irrm_ZERO: return S390_ROUND_ZERO; |
| 487 | case Irrm_PosINF: return S390_ROUND_POSINF; |
| 488 | case Irrm_NegINF: return S390_ROUND_NEGINF; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | vpanic("decode_rounding_mode"); |
| 493 | } |
| 494 | |
| 495 | |
| 496 | /* CC_S390 holds the condition code in s390 encoding. Convert it to |
| 497 | VEX encoding |
| 498 | |
| 499 | s390 VEX b6 b2 b0 cc.1 cc.0 |
| 500 | 0 0x40 EQ 1 0 0 0 0 |
| 501 | 1 0x01 LT 0 0 1 0 1 |
| 502 | 2 0x00 GT 0 0 0 1 0 |
| 503 | 3 0x45 Unordered 1 1 1 1 1 |
| 504 | |
| 505 | b0 = cc.0 |
| 506 | b2 = cc.0 & cc.1 |
| 507 | b6 = ~(cc.0 ^ cc.1) // ((cc.0 - cc.1) + 0x1 ) & 0x1 |
| 508 | |
| 509 | VEX = b0 | (b2 << 2) | (b6 << 6); |
| 510 | */ |
| 511 | static HReg |
| 512 | convert_s390_fpcc_to_vex(ISelEnv *env, HReg cc_s390) |
| 513 | { |
| 514 | HReg cc0, cc1, b2, b6, cc_vex; |
| 515 | |
| 516 | cc0 = newVRegI(env); |
| 517 | addInstr(env, s390_insn_move(4, cc0, cc_s390)); |
| 518 | addInstr(env, s390_insn_alu(4, S390_ALU_AND, cc0, s390_opnd_imm(1))); |
| 519 | |
| 520 | cc1 = newVRegI(env); |
| 521 | addInstr(env, s390_insn_move(4, cc1, cc_s390)); |
| 522 | addInstr(env, s390_insn_alu(4, S390_ALU_RSH, cc1, s390_opnd_imm(1))); |
| 523 | |
| 524 | b2 = newVRegI(env); |
| 525 | addInstr(env, s390_insn_move(4, b2, cc0)); |
| 526 | addInstr(env, s390_insn_alu(4, S390_ALU_AND, b2, s390_opnd_reg(cc1))); |
| 527 | addInstr(env, s390_insn_alu(4, S390_ALU_LSH, b2, s390_opnd_imm(2))); |
| 528 | |
| 529 | b6 = newVRegI(env); |
| 530 | addInstr(env, s390_insn_move(4, b6, cc0)); |
| 531 | addInstr(env, s390_insn_alu(4, S390_ALU_SUB, b6, s390_opnd_reg(cc1))); |
| 532 | addInstr(env, s390_insn_alu(4, S390_ALU_ADD, b6, s390_opnd_imm(1))); |
| 533 | addInstr(env, s390_insn_alu(4, S390_ALU_AND, b6, s390_opnd_imm(1))); |
| 534 | addInstr(env, s390_insn_alu(4, S390_ALU_LSH, b6, s390_opnd_imm(6))); |
| 535 | |
| 536 | cc_vex = newVRegI(env); |
| 537 | addInstr(env, s390_insn_move(4, cc_vex, cc0)); |
| 538 | addInstr(env, s390_insn_alu(4, S390_ALU_OR, cc_vex, s390_opnd_reg(b2))); |
| 539 | addInstr(env, s390_insn_alu(4, S390_ALU_OR, cc_vex, s390_opnd_reg(b6))); |
| 540 | |
| 541 | return cc_vex; |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /*---------------------------------------------------------*/ |
| 546 | /*--- ISEL: Integer expressions (128 bit) ---*/ |
| 547 | /*---------------------------------------------------------*/ |
| 548 | static void |
| 549 | s390_isel_int128_expr_wrk(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, |
| 550 | IRExpr *expr) |
| 551 | { |
| 552 | IRType ty = typeOfIRExpr(env->type_env, expr); |
| 553 | |
| 554 | vassert(ty == Ity_I128); |
| 555 | |
| 556 | /* No need to consider the following |
| 557 | - 128-bit constants (they do not exist in VEX) |
| 558 | - 128-bit loads from memory (will not be generated) |
| 559 | */ |
| 560 | |
| 561 | /* Read 128-bit IRTemp */ |
| 562 | if (expr->tag == Iex_RdTmp) { |
| 563 | lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| 564 | return; |
| 565 | } |
| 566 | |
| 567 | if (expr->tag == Iex_Binop) { |
| 568 | IRExpr *arg1 = expr->Iex.Binop.arg1; |
| 569 | IRExpr *arg2 = expr->Iex.Binop.arg2; |
| 570 | Bool is_signed_multiply, is_signed_divide; |
| 571 | |
| 572 | switch (expr->Iex.Binop.op) { |
| 573 | case Iop_MullU64: |
| 574 | is_signed_multiply = False; |
| 575 | goto do_multiply64; |
| 576 | |
| 577 | case Iop_MullS64: |
| 578 | is_signed_multiply = True; |
| 579 | goto do_multiply64; |
| 580 | |
| 581 | case Iop_DivModU128to64: |
| 582 | is_signed_divide = False; |
| 583 | goto do_divide64; |
| 584 | |
| 585 | case Iop_DivModS128to64: |
| 586 | is_signed_divide = True; |
| 587 | goto do_divide64; |
| 588 | |
| 589 | case Iop_64HLto128: |
| 590 | *dst_hi = s390_isel_int_expr(env, arg1); |
| 591 | *dst_lo = s390_isel_int_expr(env, arg2); |
| 592 | return; |
| 593 | |
| 594 | case Iop_DivModS64to64: { |
| 595 | HReg r10, r11, h1; |
| 596 | s390_opnd_RMI op2; |
| 597 | |
| 598 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 599 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 600 | |
| 601 | /* We use non-virtual registers r10 and r11 as pair */ |
| 602 | r10 = make_gpr(env, 10); |
| 603 | r11 = make_gpr(env, 11); |
| 604 | |
| 605 | /* Move 1st operand into r11 and */ |
| 606 | addInstr(env, s390_insn_move(8, r11, h1)); |
| 607 | |
| 608 | /* Divide */ |
| 609 | addInstr(env, s390_insn_divs(8, r10, r11, op2)); |
| 610 | |
| 611 | /* The result is in registers r10 (remainder) and r11 (quotient). |
| 612 | Move the result into the reg pair that is being returned such |
| 613 | such that the low 64 bits are the quotient and the upper 64 bits |
| 614 | are the remainder. (see libvex_ir.h). */ |
| 615 | *dst_hi = newVRegI(env); |
| 616 | *dst_lo = newVRegI(env); |
| 617 | addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| 618 | addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | default: |
| 623 | break; |
| 624 | |
| 625 | do_multiply64: { |
| 626 | HReg r10, r11, h1; |
| 627 | s390_opnd_RMI op2; |
| 628 | |
| 629 | order_commutative_operands(arg1, arg2); |
| 630 | |
| 631 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 632 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 633 | |
| 634 | /* We use non-virtual registers r10 and r11 as pair */ |
| 635 | r10 = make_gpr(env, 10); |
| 636 | r11 = make_gpr(env, 11); |
| 637 | |
| 638 | /* Move the first operand to r11 */ |
| 639 | addInstr(env, s390_insn_move(8, r11, h1)); |
| 640 | |
| 641 | /* Multiply */ |
| 642 | addInstr(env, s390_insn_mul(8, r10, r11, op2, is_signed_multiply)); |
| 643 | |
| 644 | /* The result is in registers r10 and r11. Assign to two virtual regs |
| 645 | and return. */ |
| 646 | *dst_hi = newVRegI(env); |
| 647 | *dst_lo = newVRegI(env); |
| 648 | addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| 649 | addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| 650 | return; |
| 651 | } |
| 652 | |
| 653 | do_divide64: { |
| 654 | HReg r10, r11, hi, lo; |
| 655 | s390_opnd_RMI op2; |
| 656 | |
| 657 | s390_isel_int128_expr(&hi, &lo, env, arg1); |
| 658 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 659 | |
| 660 | /* We use non-virtual registers r10 and r11 as pair */ |
| 661 | r10 = make_gpr(env, 10); |
| 662 | r11 = make_gpr(env, 11); |
| 663 | |
| 664 | /* Move high 64 bits of the 1st operand into r10 and |
| 665 | the low 64 bits into r11. */ |
| 666 | addInstr(env, s390_insn_move(8, r10, hi)); |
| 667 | addInstr(env, s390_insn_move(8, r11, lo)); |
| 668 | |
| 669 | /* Divide */ |
| 670 | addInstr(env, s390_insn_div(8, r10, r11, op2, is_signed_divide)); |
| 671 | |
| 672 | /* The result is in registers r10 (remainder) and r11 (quotient). |
| 673 | Move the result into the reg pair that is being returned such |
| 674 | such that the low 64 bits are the quotient and the upper 64 bits |
| 675 | are the remainder. (see libvex_ir.h). */ |
| 676 | *dst_hi = newVRegI(env); |
| 677 | *dst_lo = newVRegI(env); |
| 678 | addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| 679 | addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| 680 | return; |
| 681 | } |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | vpanic("s390_isel_int128_expr"); |
| 686 | } |
| 687 | |
| 688 | |
| 689 | /* Compute a 128-bit value into two 64-bit registers. These may be either |
| 690 | real or virtual regs; in any case they must not be changed by subsequent |
| 691 | code emitted by the caller. */ |
| 692 | static void |
| 693 | s390_isel_int128_expr(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, IRExpr *expr) |
| 694 | { |
| 695 | s390_isel_int128_expr_wrk(dst_hi, dst_lo, env, expr); |
| 696 | |
| 697 | /* Sanity checks ... */ |
| 698 | vassert(hregIsVirtual(*dst_hi)); |
| 699 | vassert(hregIsVirtual(*dst_lo)); |
| 700 | vassert(hregClass(*dst_hi) == HRcInt64); |
| 701 | vassert(hregClass(*dst_lo) == HRcInt64); |
| 702 | } |
| 703 | |
| 704 | |
| 705 | /*---------------------------------------------------------*/ |
| 706 | /*--- ISEL: Integer expressions (64/32/16/8 bit) ---*/ |
| 707 | /*---------------------------------------------------------*/ |
| 708 | |
| 709 | /* Select insns for an integer-typed expression, and add them to the |
| 710 | code list. Return a reg holding the result. This reg will be a |
| 711 | virtual register. THE RETURNED REG MUST NOT BE MODIFIED. If you |
| 712 | want to modify it, ask for a new vreg, copy it in there, and modify |
| 713 | the copy. The register allocator will do its best to map both |
| 714 | vregs to the same real register, so the copies will often disappear |
| 715 | later in the game. |
| 716 | |
| 717 | This should handle expressions of 64, 32, 16 and 8-bit type. |
| 718 | All results are returned in a 64bit register. |
| 719 | For 16- and 8-bit expressions, the upper (32/48/56 : 16/24) bits |
| 720 | are arbitrary, so you should mask or sign extend partial values |
| 721 | if necessary. |
| 722 | */ |
| 723 | |
| 724 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 725 | static HReg |
| 726 | s390_isel_int_expr_wrk(ISelEnv *env, IRExpr *expr) |
| 727 | { |
| 728 | IRType ty = typeOfIRExpr(env->type_env, expr); |
| 729 | UChar size; |
| 730 | s390_bfp_unop_t bfpop; |
| 731 | |
| 732 | vassert(ty == Ity_I8 || ty == Ity_I16 || ty == Ity_I32 || ty == Ity_I64); |
| 733 | |
| 734 | size = sizeofIRType(ty); /* size of the result after evaluating EXPR */ |
| 735 | |
| 736 | switch (expr->tag) { |
| 737 | |
| 738 | /* --------- TEMP --------- */ |
| 739 | case Iex_RdTmp: |
| 740 | /* Return the virtual register that holds the temporary. */ |
| 741 | return lookupIRTemp(env, expr->Iex.RdTmp.tmp); |
| 742 | |
| 743 | /* --------- LOAD --------- */ |
| 744 | case Iex_Load: { |
| 745 | HReg dst = newVRegI(env); |
| 746 | s390_amode *am = s390_isel_amode(env, expr->Iex.Load.addr); |
| 747 | |
| 748 | if (expr->Iex.Load.end != Iend_BE) |
| 749 | goto irreducible; |
| 750 | |
| 751 | addInstr(env, s390_insn_load(size, dst, am)); |
| 752 | |
| 753 | return dst; |
| 754 | } |
| 755 | |
| 756 | /* --------- BINARY OP --------- */ |
| 757 | case Iex_Binop: { |
| 758 | IRExpr *arg1 = expr->Iex.Binop.arg1; |
| 759 | IRExpr *arg2 = expr->Iex.Binop.arg2; |
| 760 | HReg h1, res; |
| 761 | s390_alu_t opkind; |
| 762 | s390_opnd_RMI op2, value, opnd; |
| 763 | s390_insn *insn; |
| 764 | Bool is_commutative, is_signed_multiply, is_signed_divide; |
| 765 | |
| 766 | is_commutative = True; |
| 767 | |
| 768 | switch (expr->Iex.Binop.op) { |
| 769 | case Iop_MullU8: |
| 770 | case Iop_MullU16: |
| 771 | case Iop_MullU32: |
| 772 | is_signed_multiply = False; |
| 773 | goto do_multiply; |
| 774 | |
| 775 | case Iop_MullS8: |
| 776 | case Iop_MullS16: |
| 777 | case Iop_MullS32: |
| 778 | is_signed_multiply = True; |
| 779 | goto do_multiply; |
| 780 | |
| 781 | do_multiply: { |
| 782 | HReg r10, r11; |
| 783 | UInt arg_size = size / 2; |
| 784 | |
| 785 | order_commutative_operands(arg1, arg2); |
| 786 | |
| 787 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 788 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 789 | |
| 790 | /* We use non-virtual registers r10 and r11 as pair */ |
| 791 | r10 = make_gpr(env, 10); |
| 792 | r11 = make_gpr(env, 11); |
| 793 | |
| 794 | /* Move the first operand to r11 */ |
| 795 | addInstr(env, s390_insn_move(arg_size, r11, h1)); |
| 796 | |
| 797 | /* Multiply */ |
| 798 | addInstr(env, s390_insn_mul(arg_size, r10, r11, op2, is_signed_multiply)); |
| 799 | |
| 800 | /* The result is in registers r10 and r11. Combine them into a SIZE-bit |
| 801 | value into the destination register. */ |
| 802 | res = newVRegI(env); |
| 803 | addInstr(env, s390_insn_move(arg_size, res, r10)); |
| 804 | value = s390_opnd_imm(arg_size * 8); |
| 805 | addInstr(env, s390_insn_alu(size, S390_ALU_LSH, res, value)); |
| 806 | value = s390_opnd_imm((((ULong)1) << arg_size * 8) - 1); |
| 807 | addInstr(env, s390_insn_alu(size, S390_ALU_AND, r11, value)); |
| 808 | opnd = s390_opnd_reg(r11); |
| 809 | addInstr(env, s390_insn_alu(size, S390_ALU_OR, res, opnd)); |
| 810 | return res; |
| 811 | } |
| 812 | |
| 813 | case Iop_DivModS64to32: |
| 814 | is_signed_divide = True; |
| 815 | goto do_divide; |
| 816 | |
| 817 | case Iop_DivModU64to32: |
| 818 | is_signed_divide = False; |
| 819 | goto do_divide; |
| 820 | |
| 821 | do_divide: { |
| 822 | HReg r10, r11; |
| 823 | |
| 824 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 825 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 826 | |
| 827 | /* We use non-virtual registers r10 and r11 as pair */ |
| 828 | r10 = make_gpr(env, 10); |
| 829 | r11 = make_gpr(env, 11); |
| 830 | |
| 831 | /* Split the first operand and put the high 32 bits into r10 and |
| 832 | the low 32 bits into r11. */ |
| 833 | addInstr(env, s390_insn_move(8, r10, h1)); |
| 834 | addInstr(env, s390_insn_move(8, r11, h1)); |
| 835 | value = s390_opnd_imm(32); |
| 836 | addInstr(env, s390_insn_alu(8, S390_ALU_RSH, r10, value)); |
| 837 | |
| 838 | /* Divide */ |
| 839 | addInstr(env, s390_insn_div(4, r10, r11, op2, is_signed_divide)); |
| 840 | |
| 841 | /* The result is in registers r10 (remainder) and r11 (quotient). |
| 842 | Combine them into a 64-bit value such that the low 32 bits are |
| 843 | the quotient and the upper 32 bits are the remainder. (see |
| 844 | libvex_ir.h). */ |
| 845 | res = newVRegI(env); |
| 846 | addInstr(env, s390_insn_move(8, res, r10)); |
| 847 | value = s390_opnd_imm(32); |
| 848 | addInstr(env, s390_insn_alu(8, S390_ALU_LSH, res, value)); |
| 849 | value = s390_opnd_imm((((ULong)1) << 32) - 1); |
| 850 | addInstr(env, s390_insn_alu(8, S390_ALU_AND, r11, value)); |
| 851 | opnd = s390_opnd_reg(r11); |
| 852 | addInstr(env, s390_insn_alu(8, S390_ALU_OR, res, opnd)); |
| 853 | return res; |
| 854 | } |
| 855 | |
| 856 | case Iop_F32toI32S: bfpop = S390_BFP_F32_TO_I32; goto do_convert; |
| 857 | case Iop_F32toI64S: bfpop = S390_BFP_F32_TO_I64; goto do_convert; |
| 858 | case Iop_F64toI32S: bfpop = S390_BFP_F64_TO_I32; goto do_convert; |
| 859 | case Iop_F64toI64S: bfpop = S390_BFP_F64_TO_I64; goto do_convert; |
| 860 | case Iop_F128toI32S: bfpop = S390_BFP_F128_TO_I32; goto do_convert_128; |
| 861 | case Iop_F128toI64S: bfpop = S390_BFP_F128_TO_I64; goto do_convert_128; |
| 862 | |
| 863 | do_convert: { |
| 864 | s390_round_t rounding_mode; |
| 865 | |
| 866 | res = newVRegI(env); |
| 867 | h1 = s390_isel_float_expr(env, arg2); /* Process operand */ |
| 868 | |
| 869 | rounding_mode = decode_rounding_mode(arg1); |
| 870 | addInstr(env, s390_insn_bfp_unop(size, bfpop, res, h1, rounding_mode)); |
| 871 | return res; |
| 872 | } |
| 873 | |
| 874 | do_convert_128: { |
| 875 | s390_round_t rounding_mode; |
| 876 | HReg op_hi, op_lo, f13, f15; |
| 877 | |
| 878 | res = newVRegI(env); |
| 879 | s390_isel_float128_expr(&op_hi, &op_lo, env, arg2); /* operand */ |
| 880 | |
| 881 | /* We use non-virtual registers r13 and r15 as pair */ |
| 882 | f13 = make_fpr(13); |
| 883 | f15 = make_fpr(15); |
| 884 | |
| 885 | /* operand --> (f13, f15) */ |
| 886 | addInstr(env, s390_insn_move(8, f13, op_hi)); |
| 887 | addInstr(env, s390_insn_move(8, f15, op_lo)); |
| 888 | |
| 889 | rounding_mode = decode_rounding_mode(arg1); |
| 890 | addInstr(env, s390_insn_bfp128_convert_from(size, bfpop, res, f13, f15, |
| 891 | rounding_mode)); |
| 892 | return res; |
| 893 | } |
| 894 | |
| 895 | case Iop_8HLto16: |
| 896 | case Iop_16HLto32: |
| 897 | case Iop_32HLto64: { |
| 898 | HReg h2; |
| 899 | UInt arg_size = size / 2; |
| 900 | |
| 901 | res = newVRegI(env); |
| 902 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 903 | h2 = s390_isel_int_expr(env, arg2); /* Process 2nd operand */ |
| 904 | |
| 905 | addInstr(env, s390_insn_move(arg_size, res, h1)); |
| 906 | value = s390_opnd_imm(arg_size * 8); |
| 907 | addInstr(env, s390_insn_alu(size, S390_ALU_LSH, res, value)); |
| 908 | value = s390_opnd_imm((((ULong)1) << arg_size * 8) - 1); |
| 909 | addInstr(env, s390_insn_alu(size, S390_ALU_AND, h2, value)); |
| 910 | opnd = s390_opnd_reg(h2); |
| 911 | addInstr(env, s390_insn_alu(size, S390_ALU_OR, res, opnd)); |
| 912 | return res; |
| 913 | } |
| 914 | |
| 915 | case Iop_Max32U: { |
| 916 | /* arg1 > arg2 ? arg1 : arg2 using uint32_t arguments */ |
| 917 | res = newVRegI(env); |
| 918 | h1 = s390_isel_int_expr(env, arg1); |
| 919 | op2 = s390_isel_int_expr_RMI(env, arg2); |
| 920 | |
| 921 | addInstr(env, s390_insn_move(size, res, h1)); |
| 922 | addInstr(env, s390_insn_compare(size, res, op2, False /* signed */)); |
| 923 | addInstr(env, s390_insn_cond_move(size, S390_CC_L, res, op2)); |
| 924 | return res; |
| 925 | } |
| 926 | |
| 927 | case Iop_CmpF32: |
| 928 | case Iop_CmpF64: { |
| 929 | HReg cc_s390, h2; |
| 930 | |
| 931 | h1 = s390_isel_float_expr(env, arg1); |
| 932 | h2 = s390_isel_float_expr(env, arg2); |
| 933 | cc_s390 = newVRegI(env); |
| 934 | |
| 935 | size = (expr->Iex.Binop.op == Iop_CmpF32) ? 4 : 8; |
| 936 | |
| 937 | addInstr(env, s390_insn_bfp_compare(size, cc_s390, h1, h2)); |
| 938 | |
| 939 | return convert_s390_fpcc_to_vex(env, cc_s390); |
| 940 | } |
| 941 | |
| 942 | case Iop_CmpF128: { |
| 943 | HReg op1_hi, op1_lo, op2_hi, op2_lo, f12, f13, f14, f15, cc_s390; |
| 944 | |
| 945 | s390_isel_float128_expr(&op1_hi, &op1_lo, env, arg1); /* 1st operand */ |
| 946 | s390_isel_float128_expr(&op2_hi, &op2_lo, env, arg2); /* 2nd operand */ |
| 947 | cc_s390 = newVRegI(env); |
| 948 | |
| 949 | /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| 950 | f12 = make_fpr(12); |
| 951 | f13 = make_fpr(13); |
| 952 | f14 = make_fpr(14); |
| 953 | f15 = make_fpr(15); |
| 954 | |
| 955 | /* 1st operand --> (f12, f14) */ |
| 956 | addInstr(env, s390_insn_move(8, f12, op1_hi)); |
| 957 | addInstr(env, s390_insn_move(8, f14, op1_lo)); |
| 958 | |
| 959 | /* 2nd operand --> (f13, f15) */ |
| 960 | addInstr(env, s390_insn_move(8, f13, op2_hi)); |
| 961 | addInstr(env, s390_insn_move(8, f15, op2_lo)); |
| 962 | |
| 963 | res = newVRegI(env); |
| 964 | addInstr(env, s390_insn_bfp128_compare(16, cc_s390, f12, f14, f13, f15)); |
| 965 | |
| 966 | return convert_s390_fpcc_to_vex(env, cc_s390); |
| 967 | } |
| 968 | |
| 969 | case Iop_Add8: |
| 970 | case Iop_Add16: |
| 971 | case Iop_Add32: |
| 972 | case Iop_Add64: |
| 973 | opkind = S390_ALU_ADD; |
| 974 | break; |
| 975 | |
| 976 | case Iop_Sub8: |
| 977 | case Iop_Sub16: |
| 978 | case Iop_Sub32: |
| 979 | case Iop_Sub64: |
| 980 | opkind = S390_ALU_SUB; |
| 981 | is_commutative = False; |
| 982 | break; |
| 983 | |
| 984 | case Iop_And8: |
| 985 | case Iop_And16: |
| 986 | case Iop_And32: |
| 987 | case Iop_And64: |
| 988 | opkind = S390_ALU_AND; |
| 989 | break; |
| 990 | |
| 991 | case Iop_Or8: |
| 992 | case Iop_Or16: |
| 993 | case Iop_Or32: |
| 994 | case Iop_Or64: |
| 995 | opkind = S390_ALU_OR; |
| 996 | break; |
| 997 | |
| 998 | case Iop_Xor8: |
| 999 | case Iop_Xor16: |
| 1000 | case Iop_Xor32: |
| 1001 | case Iop_Xor64: |
| 1002 | opkind = S390_ALU_XOR; |
| 1003 | break; |
| 1004 | |
| 1005 | case Iop_Shl8: |
| 1006 | case Iop_Shl16: |
| 1007 | case Iop_Shl32: |
| 1008 | case Iop_Shl64: |
| 1009 | opkind = S390_ALU_LSH; |
| 1010 | is_commutative = False; |
| 1011 | break; |
| 1012 | |
| 1013 | case Iop_Shr8: |
| 1014 | case Iop_Shr16: |
| 1015 | case Iop_Shr32: |
| 1016 | case Iop_Shr64: |
| 1017 | opkind = S390_ALU_RSH; |
| 1018 | is_commutative = False; |
| 1019 | break; |
| 1020 | |
| 1021 | case Iop_Sar8: |
| 1022 | case Iop_Sar16: |
| 1023 | case Iop_Sar32: |
| 1024 | case Iop_Sar64: |
| 1025 | opkind = S390_ALU_RSHA; |
| 1026 | is_commutative = False; |
| 1027 | break; |
| 1028 | |
| 1029 | default: |
| 1030 | goto irreducible; |
| 1031 | } |
| 1032 | |
| 1033 | /* Pattern match: 0 - arg1 --> -arg1 */ |
| 1034 | if (opkind == S390_ALU_SUB && s390_expr_is_const_zero(arg1)) { |
| 1035 | res = newVRegI(env); |
| 1036 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 1037 | insn = s390_insn_unop(size, S390_NEGATE, res, op2); |
| 1038 | addInstr(env, insn); |
| 1039 | |
| 1040 | return res; |
| 1041 | } |
| 1042 | |
| 1043 | if (is_commutative) { |
| 1044 | order_commutative_operands(arg1, arg2); |
| 1045 | } |
| 1046 | |
| 1047 | h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| 1048 | op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| 1049 | res = newVRegI(env); |
| 1050 | addInstr(env, s390_insn_move(size, res, h1)); |
| 1051 | insn = s390_insn_alu(size, opkind, res, op2); |
| 1052 | |
| 1053 | addInstr(env, insn); |
| 1054 | |
| 1055 | return res; |
| 1056 | } |
| 1057 | |
| 1058 | /* --------- UNARY OP --------- */ |
| 1059 | case Iex_Unop: { |
| 1060 | static s390_opnd_RMI mask = { S390_OPND_IMMEDIATE }; |
| 1061 | static s390_opnd_RMI shift = { S390_OPND_IMMEDIATE }; |
| 1062 | s390_opnd_RMI opnd; |
| 1063 | s390_insn *insn; |
| 1064 | IRExpr *arg; |
| 1065 | HReg dst, h1; |
| 1066 | IROp unop, binop; |
| 1067 | |
| 1068 | arg = expr->Iex.Unop.arg; |
| 1069 | |
| 1070 | /* Special cases are handled here */ |
| 1071 | |
| 1072 | /* 32-bit multiply with 32-bit result or |
| 1073 | 64-bit multiply with 64-bit result */ |
| 1074 | unop = expr->Iex.Unop.op; |
| 1075 | binop = arg->Iex.Binop.op; |
| 1076 | |
| 1077 | if ((arg->tag == Iex_Binop && |
| 1078 | ((unop == Iop_64to32 && |
| 1079 | (binop == Iop_MullS32 || binop == Iop_MullU32)) || |
| 1080 | (unop == Iop_128to64 && |
| 1081 | (binop == Iop_MullS64 || binop == Iop_MullU64))))) { |
| 1082 | h1 = s390_isel_int_expr(env, arg->Iex.Binop.arg1); /* 1st opnd */ |
| 1083 | opnd = s390_isel_int_expr_RMI(env, arg->Iex.Binop.arg2); /* 2nd opnd */ |
| 1084 | dst = newVRegI(env); /* Result goes into a new register */ |
| 1085 | addInstr(env, s390_insn_move(size, dst, h1)); |
| 1086 | addInstr(env, s390_insn_alu(size, S390_ALU_MUL, dst, opnd)); |
| 1087 | |
| 1088 | return dst; |
| 1089 | } |
| 1090 | |
florian | 4d71a08 | 2011-12-18 00:08:17 +0000 | [diff] [blame] | 1091 | if (unop == Iop_ReinterpF64asI64 || unop == Iop_ReinterpF32asI32) { |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1092 | dst = newVRegI(env); |
| 1093 | h1 = s390_isel_float_expr(env, arg); /* Process the operand */ |
| 1094 | addInstr(env, s390_insn_move(size, dst, h1)); |
| 1095 | |
| 1096 | return dst; |
| 1097 | } |
| 1098 | |
| 1099 | /* Expressions whose argument is 1-bit wide */ |
| 1100 | if (typeOfIRExpr(env->type_env, arg) == Ity_I1) { |
| 1101 | s390_cc_t cond = s390_isel_cc(env, arg); |
| 1102 | dst = newVRegI(env); /* Result goes into a new register */ |
| 1103 | addInstr(env, s390_insn_cc2bool(dst, cond)); |
| 1104 | |
| 1105 | switch (unop) { |
| 1106 | case Iop_1Uto8: |
| 1107 | case Iop_1Uto32: |
| 1108 | case Iop_1Uto64: |
| 1109 | /* Nothing to do */ |
| 1110 | break; |
| 1111 | |
| 1112 | case Iop_1Sto8: |
| 1113 | case Iop_1Sto16: |
| 1114 | case Iop_1Sto32: |
| 1115 | shift.variant.imm = 31; |
| 1116 | addInstr(env, s390_insn_alu(4, S390_ALU_LSH, dst, shift)); |
| 1117 | addInstr(env, s390_insn_alu(4, S390_ALU_RSHA, dst, shift)); |
| 1118 | break; |
| 1119 | |
| 1120 | case Iop_1Sto64: |
| 1121 | shift.variant.imm = 63; |
| 1122 | addInstr(env, s390_insn_alu(8, S390_ALU_LSH, dst, shift)); |
| 1123 | addInstr(env, s390_insn_alu(8, S390_ALU_RSHA, dst, shift)); |
| 1124 | break; |
| 1125 | |
| 1126 | default: |
| 1127 | goto irreducible; |
| 1128 | } |
| 1129 | |
| 1130 | return dst; |
| 1131 | } |
| 1132 | |
| 1133 | /* Regular processing */ |
| 1134 | |
| 1135 | if (unop == Iop_128to64) { |
| 1136 | HReg dst_hi, dst_lo; |
| 1137 | |
| 1138 | s390_isel_int128_expr(&dst_hi, &dst_lo, env, arg); |
| 1139 | return dst_lo; |
| 1140 | } |
| 1141 | |
| 1142 | if (unop == Iop_128HIto64) { |
| 1143 | HReg dst_hi, dst_lo; |
| 1144 | |
| 1145 | s390_isel_int128_expr(&dst_hi, &dst_lo, env, arg); |
| 1146 | return dst_hi; |
| 1147 | } |
| 1148 | |
| 1149 | dst = newVRegI(env); /* Result goes into a new register */ |
| 1150 | opnd = s390_isel_int_expr_RMI(env, arg); /* Process the operand */ |
| 1151 | |
| 1152 | switch (unop) { |
| 1153 | case Iop_8Uto16: |
| 1154 | case Iop_8Uto32: |
| 1155 | case Iop_8Uto64: |
| 1156 | insn = s390_insn_unop(size, S390_ZERO_EXTEND_8, dst, opnd); |
| 1157 | break; |
| 1158 | |
| 1159 | case Iop_16Uto32: |
| 1160 | case Iop_16Uto64: |
| 1161 | insn = s390_insn_unop(size, S390_ZERO_EXTEND_16, dst, opnd); |
| 1162 | break; |
| 1163 | |
| 1164 | case Iop_32Uto64: |
| 1165 | insn = s390_insn_unop(size, S390_ZERO_EXTEND_32, dst, opnd); |
| 1166 | break; |
| 1167 | |
| 1168 | case Iop_8Sto16: |
| 1169 | case Iop_8Sto32: |
| 1170 | case Iop_8Sto64: |
| 1171 | insn = s390_insn_unop(size, S390_SIGN_EXTEND_8, dst, opnd); |
| 1172 | break; |
| 1173 | |
| 1174 | case Iop_16Sto32: |
| 1175 | case Iop_16Sto64: |
| 1176 | insn = s390_insn_unop(size, S390_SIGN_EXTEND_16, dst, opnd); |
| 1177 | break; |
| 1178 | |
| 1179 | case Iop_32Sto64: |
| 1180 | insn = s390_insn_unop(size, S390_SIGN_EXTEND_32, dst, opnd); |
| 1181 | break; |
| 1182 | |
| 1183 | case Iop_64to8: |
| 1184 | case Iop_64to16: |
| 1185 | case Iop_64to32: |
| 1186 | case Iop_32to8: |
| 1187 | case Iop_32to16: |
| 1188 | case Iop_16to8: |
| 1189 | /* Down-casts are no-ops. Upstream operations will only look at |
| 1190 | the bytes that make up the result of the down-cast. So there |
| 1191 | is no point setting the other bytes to 0. */ |
| 1192 | insn = s390_opnd_copy(8, dst, opnd); |
| 1193 | break; |
| 1194 | |
| 1195 | case Iop_64HIto32: |
| 1196 | addInstr(env, s390_opnd_copy(8, dst, opnd)); |
| 1197 | shift.variant.imm = 32; |
| 1198 | insn = s390_insn_alu(8, S390_ALU_RSH, dst, shift); |
| 1199 | break; |
| 1200 | |
| 1201 | case Iop_32HIto16: |
| 1202 | addInstr(env, s390_opnd_copy(4, dst, opnd)); |
| 1203 | shift.variant.imm = 16; |
| 1204 | insn = s390_insn_alu(4, S390_ALU_RSH, dst, shift); |
| 1205 | break; |
| 1206 | |
| 1207 | case Iop_16HIto8: |
| 1208 | addInstr(env, s390_opnd_copy(2, dst, opnd)); |
| 1209 | shift.variant.imm = 8; |
| 1210 | insn = s390_insn_alu(2, S390_ALU_RSH, dst, shift); |
| 1211 | break; |
| 1212 | |
| 1213 | case Iop_Not8: |
| 1214 | case Iop_Not16: |
| 1215 | case Iop_Not32: |
| 1216 | case Iop_Not64: |
| 1217 | /* XOR with ffff... */ |
| 1218 | mask.variant.imm = ~(ULong)0; |
| 1219 | addInstr(env, s390_opnd_copy(size, dst, opnd)); |
| 1220 | insn = s390_insn_alu(size, S390_ALU_XOR, dst, mask); |
| 1221 | break; |
| 1222 | |
| 1223 | case Iop_Left8: |
| 1224 | case Iop_Left16: |
| 1225 | case Iop_Left32: |
| 1226 | case Iop_Left64: |
| 1227 | addInstr(env, s390_insn_unop(size, S390_NEGATE, dst, opnd)); |
| 1228 | insn = s390_insn_alu(size, S390_ALU_OR, dst, opnd); |
| 1229 | break; |
| 1230 | |
| 1231 | case Iop_CmpwNEZ32: |
| 1232 | case Iop_CmpwNEZ64: { |
| 1233 | /* Use the fact that x | -x == 0 iff x == 0. Otherwise, either X |
| 1234 | or -X will have a 1 in the MSB. */ |
| 1235 | addInstr(env, s390_insn_unop(size, S390_NEGATE, dst, opnd)); |
| 1236 | addInstr(env, s390_insn_alu(size, S390_ALU_OR, dst, opnd)); |
| 1237 | shift.variant.imm = (unop == Iop_CmpwNEZ32) ? 31 : 63; |
| 1238 | addInstr(env, s390_insn_alu(size, S390_ALU_RSHA, dst, shift)); |
| 1239 | return dst; |
| 1240 | } |
| 1241 | |
| 1242 | case Iop_Clz64: { |
| 1243 | HReg r10, r11; |
| 1244 | |
sewardj | 611b06e | 2011-03-24 08:57:29 +0000 | [diff] [blame] | 1245 | /* This will be implemented using FLOGR, if possible. So we need to |
| 1246 | set aside a pair of non-virtual registers. The result (number of |
| 1247 | left-most zero bits) will be in r10. The value in r11 is unspecified |
| 1248 | and must not be used. */ |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1249 | r10 = make_gpr(env, 10); |
| 1250 | r11 = make_gpr(env, 11); |
| 1251 | |
sewardj | 611b06e | 2011-03-24 08:57:29 +0000 | [diff] [blame] | 1252 | addInstr(env, s390_insn_clz(8, r10, r11, opnd)); |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1253 | addInstr(env, s390_insn_move(8, dst, r10)); |
| 1254 | return dst; |
| 1255 | } |
| 1256 | |
| 1257 | default: |
| 1258 | goto irreducible; |
| 1259 | } |
| 1260 | |
| 1261 | addInstr(env, insn); |
| 1262 | |
| 1263 | return dst; |
| 1264 | } |
| 1265 | |
| 1266 | /* --------- GET --------- */ |
| 1267 | case Iex_Get: { |
| 1268 | HReg dst = newVRegI(env); |
| 1269 | s390_amode *am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| 1270 | |
| 1271 | /* We never load more than 8 bytes from the guest state, because the |
| 1272 | floating point register pair is not contiguous. */ |
| 1273 | vassert(size <= 8); |
| 1274 | |
| 1275 | addInstr(env, s390_insn_load(size, dst, am)); |
| 1276 | |
| 1277 | return dst; |
| 1278 | } |
| 1279 | |
| 1280 | case Iex_GetI: |
| 1281 | /* not needed */ |
| 1282 | break; |
| 1283 | |
| 1284 | /* --------- CCALL --------- */ |
| 1285 | case Iex_CCall: { |
| 1286 | HReg dst = newVRegI(env); |
| 1287 | |
| 1288 | doHelperCall(env, False, NULL, expr->Iex.CCall.cee, |
| 1289 | expr->Iex.CCall.args); |
| 1290 | |
| 1291 | /* Move the returned value into the return register */ |
| 1292 | addInstr(env, s390_insn_move(sizeofIRType(expr->Iex.CCall.retty), dst, |
| 1293 | mkHReg(S390_REGNO_RETURN_VALUE, |
| 1294 | HRcInt64, False))); |
| 1295 | return dst; |
| 1296 | } |
| 1297 | |
| 1298 | /* --------- LITERAL --------- */ |
| 1299 | |
| 1300 | /* Load a literal into a register. Create a "load immediate" |
| 1301 | v-insn and return the register. */ |
| 1302 | case Iex_Const: { |
| 1303 | ULong value; |
| 1304 | HReg dst = newVRegI(env); |
| 1305 | const IRConst *con = expr->Iex.Const.con; |
| 1306 | |
| 1307 | /* Bitwise copy of the value. No sign/zero-extension */ |
| 1308 | switch (con->tag) { |
| 1309 | case Ico_U64: value = con->Ico.U64; break; |
| 1310 | case Ico_U32: value = con->Ico.U32; break; |
| 1311 | case Ico_U16: value = con->Ico.U16; break; |
| 1312 | case Ico_U8: value = con->Ico.U8; break; |
| 1313 | default: vpanic("s390_isel_int_expr: invalid constant"); |
| 1314 | } |
| 1315 | |
| 1316 | addInstr(env, s390_insn_load_immediate(size, dst, value)); |
| 1317 | |
| 1318 | return dst; |
| 1319 | } |
| 1320 | |
| 1321 | /* --------- MULTIPLEX --------- */ |
| 1322 | case Iex_Mux0X: { |
| 1323 | IRExpr *cond_expr; |
| 1324 | HReg dst, tmp, rX; |
| 1325 | s390_opnd_RMI cond, r0, zero; |
| 1326 | |
| 1327 | cond_expr = expr->Iex.Mux0X.cond; |
| 1328 | |
| 1329 | dst = newVRegI(env); |
| 1330 | r0 = s390_isel_int_expr_RMI(env, expr->Iex.Mux0X.expr0); |
| 1331 | rX = s390_isel_int_expr(env, expr->Iex.Mux0X.exprX); |
| 1332 | size = sizeofIRType(typeOfIRExpr(env->type_env, expr->Iex.Mux0X.exprX)); |
| 1333 | |
| 1334 | if (cond_expr->tag == Iex_Unop && cond_expr->Iex.Unop.op == Iop_1Uto8) { |
| 1335 | s390_cc_t cc = s390_isel_cc(env, cond_expr->Iex.Unop.arg); |
| 1336 | |
| 1337 | addInstr(env, s390_insn_move(size, dst, rX)); |
| 1338 | addInstr(env, s390_insn_cond_move(size, s390_cc_invert(cc), dst, r0)); |
| 1339 | return dst; |
| 1340 | } |
| 1341 | |
| 1342 | /* Assume the condition is true and move rX to the destination reg. */ |
| 1343 | addInstr(env, s390_insn_move(size, dst, rX)); |
| 1344 | |
| 1345 | /* Compute the condition ... */ |
| 1346 | cond = s390_isel_int_expr_RMI(env, cond_expr); |
| 1347 | |
| 1348 | /* tmp = cond & 0xFF */ |
| 1349 | tmp = newVRegI(env); |
| 1350 | addInstr(env, s390_insn_load_immediate(4, tmp, 0xFF)); |
| 1351 | addInstr(env, s390_insn_alu(4, S390_ALU_AND, tmp, cond)); |
| 1352 | |
| 1353 | /* ... and compare it with zero */ |
| 1354 | zero = s390_opnd_imm(0); |
| 1355 | addInstr(env, s390_insn_compare(4, tmp, zero, 0 /* signed */)); |
| 1356 | |
| 1357 | /* ... and if it compared equal move r0 to the destination reg. */ |
| 1358 | size = sizeofIRType(typeOfIRExpr(env->type_env, expr->Iex.Mux0X.expr0)); |
| 1359 | addInstr(env, s390_insn_cond_move(size, S390_CC_E, dst, r0)); |
| 1360 | |
| 1361 | return dst; |
| 1362 | } |
| 1363 | |
| 1364 | default: |
| 1365 | break; |
| 1366 | } |
| 1367 | |
| 1368 | /* We get here if no pattern matched. */ |
| 1369 | irreducible: |
| 1370 | ppIRExpr(expr); |
| 1371 | vpanic("s390_isel_int_expr: cannot reduce tree"); |
| 1372 | } |
| 1373 | |
| 1374 | |
| 1375 | static HReg |
| 1376 | s390_isel_int_expr(ISelEnv *env, IRExpr *expr) |
| 1377 | { |
| 1378 | HReg dst = s390_isel_int_expr_wrk(env, expr); |
| 1379 | |
| 1380 | /* Sanity checks ... */ |
| 1381 | vassert(hregClass(dst) == HRcInt64); |
| 1382 | vassert(hregIsVirtual(dst)); |
| 1383 | |
| 1384 | return dst; |
| 1385 | } |
| 1386 | |
| 1387 | |
| 1388 | static s390_opnd_RMI |
| 1389 | s390_isel_int_expr_RMI(ISelEnv *env, IRExpr *expr) |
| 1390 | { |
| 1391 | IRType ty = typeOfIRExpr(env->type_env, expr); |
| 1392 | s390_opnd_RMI dst; |
| 1393 | |
| 1394 | vassert(ty == Ity_I8 || ty == Ity_I16 || ty == Ity_I32 || |
| 1395 | ty == Ity_I64); |
| 1396 | |
| 1397 | if (expr->tag == Iex_Load) { |
| 1398 | dst.tag = S390_OPND_AMODE; |
| 1399 | dst.variant.am = s390_isel_amode(env, expr->Iex.Load.addr); |
| 1400 | } else if (expr->tag == Iex_Get) { |
| 1401 | dst.tag = S390_OPND_AMODE; |
| 1402 | dst.variant.am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| 1403 | } else if (expr->tag == Iex_Const) { |
| 1404 | ULong value; |
| 1405 | |
| 1406 | /* The bit pattern for the value will be stored as is in the least |
| 1407 | significant bits of VALUE. */ |
| 1408 | switch (expr->Iex.Const.con->tag) { |
| 1409 | case Ico_U1: value = expr->Iex.Const.con->Ico.U1; break; |
| 1410 | case Ico_U8: value = expr->Iex.Const.con->Ico.U8; break; |
| 1411 | case Ico_U16: value = expr->Iex.Const.con->Ico.U16; break; |
| 1412 | case Ico_U32: value = expr->Iex.Const.con->Ico.U32; break; |
| 1413 | case Ico_U64: value = expr->Iex.Const.con->Ico.U64; break; |
| 1414 | default: |
| 1415 | vpanic("s390_isel_int_expr_RMI"); |
| 1416 | } |
| 1417 | |
| 1418 | dst.tag = S390_OPND_IMMEDIATE; |
| 1419 | dst.variant.imm = value; |
| 1420 | } else { |
| 1421 | dst.tag = S390_OPND_REG; |
| 1422 | dst.variant.reg = s390_isel_int_expr(env, expr); |
| 1423 | } |
| 1424 | |
| 1425 | return dst; |
| 1426 | } |
| 1427 | |
| 1428 | |
| 1429 | /*---------------------------------------------------------*/ |
| 1430 | /*--- ISEL: Floating point expressions (128 bit) ---*/ |
| 1431 | /*---------------------------------------------------------*/ |
| 1432 | static void |
| 1433 | s390_isel_float128_expr_wrk(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, |
| 1434 | IRExpr *expr) |
| 1435 | { |
| 1436 | IRType ty = typeOfIRExpr(env->type_env, expr); |
| 1437 | |
| 1438 | vassert(ty == Ity_F128); |
| 1439 | |
| 1440 | /* Read 128-bit IRTemp */ |
| 1441 | if (expr->tag == Iex_RdTmp) { |
| 1442 | lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| 1443 | return; |
| 1444 | } |
| 1445 | |
| 1446 | switch (expr->tag) { |
| 1447 | case Iex_RdTmp: |
| 1448 | /* Return the virtual registers that hold the temporary. */ |
| 1449 | lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| 1450 | return; |
| 1451 | |
| 1452 | /* --------- LOAD --------- */ |
| 1453 | case Iex_Load: { |
| 1454 | IRExpr *addr_hi, *addr_lo; |
| 1455 | s390_amode *am_hi, *am_lo; |
| 1456 | |
| 1457 | if (expr->Iex.Load.end != Iend_BE) |
| 1458 | goto irreducible; |
| 1459 | |
| 1460 | addr_hi = expr->Iex.Load.addr; |
| 1461 | addr_lo = IRExpr_Binop(Iop_Add64, addr_hi, mkU64(8)); |
| 1462 | |
| 1463 | am_hi = s390_isel_amode(env, addr_hi); |
| 1464 | am_lo = s390_isel_amode(env, addr_lo); |
| 1465 | |
| 1466 | *dst_hi = newVRegF(env); |
| 1467 | *dst_lo = newVRegF(env); |
| 1468 | addInstr(env, s390_insn_load(8, *dst_hi, am_hi)); |
| 1469 | addInstr(env, s390_insn_load(8, *dst_hi, am_lo)); |
| 1470 | return; |
| 1471 | } |
| 1472 | |
| 1473 | |
| 1474 | /* --------- GET --------- */ |
| 1475 | case Iex_Get: |
| 1476 | /* This is not supported because loading 128-bit from the guest |
| 1477 | state is almost certainly wrong. Use get_fpr_pair instead. */ |
| 1478 | vpanic("Iex_Get with F128 data"); |
| 1479 | |
| 1480 | /* --------- 4-ary OP --------- */ |
| 1481 | case Iex_Qop: |
| 1482 | vpanic("Iex_Qop with F128 data"); |
| 1483 | |
| 1484 | /* --------- TERNARY OP --------- */ |
| 1485 | case Iex_Triop: { |
| 1486 | IROp op = expr->Iex.Triop.op; |
| 1487 | IRExpr *left = expr->Iex.Triop.arg2; |
| 1488 | IRExpr *right = expr->Iex.Triop.arg3; |
| 1489 | s390_bfp_binop_t bfpop; |
| 1490 | s390_round_t rounding_mode; |
| 1491 | HReg op1_hi, op1_lo, op2_hi, op2_lo, f12, f13, f14, f15; |
| 1492 | |
| 1493 | s390_isel_float128_expr(&op1_hi, &op1_lo, env, left); /* 1st operand */ |
| 1494 | s390_isel_float128_expr(&op2_hi, &op2_lo, env, right); /* 2nd operand */ |
| 1495 | |
| 1496 | /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| 1497 | f12 = make_fpr(12); |
| 1498 | f13 = make_fpr(13); |
| 1499 | f14 = make_fpr(14); |
| 1500 | f15 = make_fpr(15); |
| 1501 | |
| 1502 | /* 1st operand --> (f12, f14) */ |
| 1503 | addInstr(env, s390_insn_move(8, f12, op1_hi)); |
| 1504 | addInstr(env, s390_insn_move(8, f14, op1_lo)); |
| 1505 | |
| 1506 | /* 2nd operand --> (f13, f15) */ |
| 1507 | addInstr(env, s390_insn_move(8, f13, op2_hi)); |
| 1508 | addInstr(env, s390_insn_move(8, f15, op2_lo)); |
| 1509 | |
| 1510 | switch (op) { |
| 1511 | case Iop_AddF128: bfpop = S390_BFP_ADD; break; |
| 1512 | case Iop_SubF128: bfpop = S390_BFP_SUB; break; |
| 1513 | case Iop_MulF128: bfpop = S390_BFP_MUL; break; |
| 1514 | case Iop_DivF128: bfpop = S390_BFP_DIV; break; |
| 1515 | default: |
| 1516 | goto irreducible; |
| 1517 | } |
| 1518 | |
| 1519 | rounding_mode = decode_rounding_mode(expr->Iex.Triop.arg1); |
| 1520 | addInstr(env, s390_insn_bfp128_binop(16, bfpop, f12, f14, f13, |
| 1521 | f15, rounding_mode)); |
| 1522 | |
| 1523 | /* Move result to virtual destination register */ |
| 1524 | *dst_hi = newVRegF(env); |
| 1525 | *dst_lo = newVRegF(env); |
| 1526 | addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| 1527 | addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| 1528 | |
| 1529 | return; |
| 1530 | } |
| 1531 | |
| 1532 | /* --------- BINARY OP --------- */ |
| 1533 | case Iex_Binop: { |
| 1534 | HReg op_hi, op_lo, f12, f13, f14, f15; |
sewardj | a970c40 | 2011-04-28 18:38:42 +0000 | [diff] [blame] | 1535 | s390_bfp_unop_t bfpop; |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1536 | s390_round_t rounding_mode; |
| 1537 | |
| 1538 | /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| 1539 | f12 = make_fpr(12); |
| 1540 | f13 = make_fpr(13); |
| 1541 | f14 = make_fpr(14); |
| 1542 | f15 = make_fpr(15); |
| 1543 | |
| 1544 | switch (expr->Iex.Binop.op) { |
| 1545 | case Iop_SqrtF128: |
| 1546 | s390_isel_float128_expr(&op_hi, &op_lo, env, expr->Iex.Binop.arg2); |
| 1547 | |
| 1548 | /* operand --> (f13, f15) */ |
| 1549 | addInstr(env, s390_insn_move(8, f13, op_hi)); |
| 1550 | addInstr(env, s390_insn_move(8, f15, op_lo)); |
| 1551 | |
| 1552 | bfpop = S390_BFP_SQRT; |
| 1553 | rounding_mode = decode_rounding_mode(expr->Iex.Binop.arg1); |
| 1554 | |
| 1555 | addInstr(env, s390_insn_bfp128_unop(16, bfpop, f12, f14, f13, f15, |
| 1556 | rounding_mode)); |
| 1557 | |
| 1558 | /* Move result to virtual destination registers */ |
| 1559 | *dst_hi = newVRegF(env); |
| 1560 | *dst_lo = newVRegF(env); |
| 1561 | addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| 1562 | addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| 1563 | return; |
| 1564 | |
| 1565 | case Iop_F64HLtoF128: |
| 1566 | *dst_hi = s390_isel_float_expr(env, expr->Iex.Binop.arg1); |
| 1567 | *dst_lo = s390_isel_float_expr(env, expr->Iex.Binop.arg2); |
| 1568 | return; |
| 1569 | |
| 1570 | default: |
| 1571 | goto irreducible; |
| 1572 | } |
| 1573 | } |
| 1574 | |
| 1575 | /* --------- UNARY OP --------- */ |
| 1576 | case Iex_Unop: { |
| 1577 | IRExpr *left = expr->Iex.Binop.arg1; |
| 1578 | s390_bfp_unop_t bfpop; |
| 1579 | s390_round_t rounding_mode; |
| 1580 | HReg op_hi, op_lo, op, f12, f13, f14, f15; |
| 1581 | |
| 1582 | /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| 1583 | f12 = make_fpr(12); |
| 1584 | f13 = make_fpr(13); |
| 1585 | f14 = make_fpr(14); |
| 1586 | f15 = make_fpr(15); |
| 1587 | |
| 1588 | switch (expr->Iex.Binop.op) { |
| 1589 | case Iop_NegF128: bfpop = S390_BFP_NEG; goto float128_opnd; |
| 1590 | case Iop_AbsF128: bfpop = S390_BFP_ABS; goto float128_opnd; |
| 1591 | case Iop_I32StoF128: bfpop = S390_BFP_I32_TO_F128; goto convert_int; |
| 1592 | case Iop_I64StoF128: bfpop = S390_BFP_I64_TO_F128; goto convert_int; |
| 1593 | case Iop_F32toF128: bfpop = S390_BFP_F32_TO_F128; goto convert_float; |
| 1594 | case Iop_F64toF128: bfpop = S390_BFP_F64_TO_F128; goto convert_float; |
| 1595 | default: |
| 1596 | goto irreducible; |
| 1597 | } |
| 1598 | |
| 1599 | float128_opnd: |
| 1600 | s390_isel_float128_expr(&op_hi, &op_lo, env, left); |
| 1601 | |
| 1602 | /* operand --> (f13, f15) */ |
| 1603 | addInstr(env, s390_insn_move(8, f13, op_hi)); |
| 1604 | addInstr(env, s390_insn_move(8, f15, op_lo)); |
| 1605 | |
| 1606 | rounding_mode = S390_ROUND_NEAREST_EVEN; /* will not be used later on */ |
| 1607 | addInstr(env, s390_insn_bfp128_unop(16, bfpop, f12, f14, f13, f15, |
| 1608 | rounding_mode)); |
| 1609 | goto move_dst; |
| 1610 | |
| 1611 | convert_float: |
| 1612 | op = s390_isel_float_expr(env, left); |
| 1613 | addInstr(env, s390_insn_bfp128_convert_to(16, bfpop, f12, f14, |
| 1614 | op)); |
| 1615 | goto move_dst; |
| 1616 | |
| 1617 | convert_int: |
| 1618 | op = s390_isel_int_expr(env, left); |
| 1619 | addInstr(env, s390_insn_bfp128_convert_to(16, bfpop, f12, f14, |
| 1620 | op)); |
| 1621 | goto move_dst; |
| 1622 | |
| 1623 | move_dst: |
| 1624 | /* Move result to virtual destination registers */ |
| 1625 | *dst_hi = newVRegF(env); |
| 1626 | *dst_lo = newVRegF(env); |
| 1627 | addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| 1628 | addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| 1629 | return; |
| 1630 | } |
| 1631 | |
| 1632 | default: |
| 1633 | goto irreducible; |
| 1634 | } |
| 1635 | |
| 1636 | /* We get here if no pattern matched. */ |
| 1637 | irreducible: |
| 1638 | ppIRExpr(expr); |
| 1639 | vpanic("s390_isel_int_expr: cannot reduce tree"); |
| 1640 | } |
| 1641 | |
| 1642 | /* Compute a 128-bit value into two 64-bit registers. These may be either |
| 1643 | real or virtual regs; in any case they must not be changed by subsequent |
| 1644 | code emitted by the caller. */ |
| 1645 | static void |
| 1646 | s390_isel_float128_expr(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, IRExpr *expr) |
| 1647 | { |
| 1648 | s390_isel_float128_expr_wrk(dst_hi, dst_lo, env, expr); |
| 1649 | |
| 1650 | /* Sanity checks ... */ |
| 1651 | vassert(hregIsVirtual(*dst_hi)); |
| 1652 | vassert(hregIsVirtual(*dst_lo)); |
| 1653 | vassert(hregClass(*dst_hi) == HRcFlt64); |
| 1654 | vassert(hregClass(*dst_lo) == HRcFlt64); |
| 1655 | } |
| 1656 | |
| 1657 | |
| 1658 | /*---------------------------------------------------------*/ |
| 1659 | /*--- ISEL: Floating point expressions (64 bit) ---*/ |
| 1660 | /*---------------------------------------------------------*/ |
| 1661 | |
| 1662 | static HReg |
| 1663 | s390_isel_float_expr_wrk(ISelEnv *env, IRExpr *expr) |
| 1664 | { |
| 1665 | IRType ty = typeOfIRExpr(env->type_env, expr); |
| 1666 | UChar size; |
| 1667 | |
| 1668 | vassert(ty == Ity_F32 || ty == Ity_F64); |
| 1669 | |
| 1670 | size = sizeofIRType(ty); |
| 1671 | |
| 1672 | switch (expr->tag) { |
| 1673 | case Iex_RdTmp: |
| 1674 | /* Return the virtual register that holds the temporary. */ |
| 1675 | return lookupIRTemp(env, expr->Iex.RdTmp.tmp); |
| 1676 | |
| 1677 | /* --------- LOAD --------- */ |
| 1678 | case Iex_Load: { |
| 1679 | HReg dst = newVRegF(env); |
| 1680 | s390_amode *am = s390_isel_amode(env, expr->Iex.Load.addr); |
| 1681 | |
| 1682 | if (expr->Iex.Load.end != Iend_BE) |
| 1683 | goto irreducible; |
| 1684 | |
| 1685 | addInstr(env, s390_insn_load(size, dst, am)); |
| 1686 | |
| 1687 | return dst; |
| 1688 | } |
| 1689 | |
| 1690 | /* --------- GET --------- */ |
| 1691 | case Iex_Get: { |
| 1692 | HReg dst = newVRegF(env); |
| 1693 | s390_amode *am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| 1694 | |
| 1695 | addInstr(env, s390_insn_load(size, dst, am)); |
| 1696 | |
| 1697 | return dst; |
| 1698 | } |
| 1699 | |
| 1700 | /* --------- LITERAL --------- */ |
| 1701 | |
| 1702 | /* Load a literal into a register. Create a "load immediate" |
| 1703 | v-insn and return the register. */ |
| 1704 | case Iex_Const: { |
| 1705 | ULong value; |
| 1706 | HReg dst = newVRegF(env); |
| 1707 | const IRConst *con = expr->Iex.Const.con; |
| 1708 | |
| 1709 | /* Bitwise copy of the value. No sign/zero-extension */ |
| 1710 | switch (con->tag) { |
| 1711 | case Ico_F32i: value = con->Ico.F32i; break; |
| 1712 | case Ico_F64i: value = con->Ico.F64i; break; |
| 1713 | default: vpanic("s390_isel_float_expr: invalid constant"); |
| 1714 | } |
| 1715 | |
| 1716 | if (value != 0) vpanic("cannot load immediate floating point constant"); |
| 1717 | |
| 1718 | addInstr(env, s390_insn_load_immediate(size, dst, value)); |
| 1719 | |
| 1720 | return dst; |
| 1721 | } |
| 1722 | |
| 1723 | /* --------- 4-ary OP --------- */ |
| 1724 | case Iex_Qop: { |
| 1725 | HReg op1, op2, op3, dst; |
| 1726 | s390_bfp_triop_t bfpop; |
| 1727 | s390_round_t rounding_mode; |
| 1728 | |
| 1729 | op1 = s390_isel_float_expr(env, expr->Iex.Qop.arg2); |
| 1730 | op2 = s390_isel_float_expr(env, expr->Iex.Qop.arg3); |
| 1731 | op3 = s390_isel_float_expr(env, expr->Iex.Qop.arg4); |
| 1732 | dst = newVRegF(env); |
| 1733 | addInstr(env, s390_insn_move(size, dst, op1)); |
| 1734 | |
| 1735 | switch (expr->Iex.Qop.op) { |
| 1736 | case Iop_MAddF32: |
| 1737 | case Iop_MAddF64: bfpop = S390_BFP_MADD; break; |
| 1738 | case Iop_MSubF32: |
| 1739 | case Iop_MSubF64: bfpop = S390_BFP_MSUB; break; |
| 1740 | |
| 1741 | default: |
| 1742 | goto irreducible; |
| 1743 | } |
| 1744 | |
| 1745 | rounding_mode = decode_rounding_mode(expr->Iex.Qop.arg1); |
| 1746 | addInstr(env, s390_insn_bfp_triop(size, bfpop, dst, op2, op3, |
| 1747 | rounding_mode)); |
| 1748 | return dst; |
| 1749 | } |
| 1750 | |
| 1751 | /* --------- TERNARY OP --------- */ |
| 1752 | case Iex_Triop: { |
| 1753 | IROp op = expr->Iex.Triop.op; |
| 1754 | IRExpr *left = expr->Iex.Triop.arg2; |
| 1755 | IRExpr *right = expr->Iex.Triop.arg3; |
| 1756 | s390_bfp_binop_t bfpop; |
| 1757 | s390_round_t rounding_mode; |
| 1758 | HReg h1, op2, dst; |
| 1759 | |
| 1760 | h1 = s390_isel_float_expr(env, left); /* Process 1st operand */ |
| 1761 | op2 = s390_isel_float_expr(env, right); /* Process 2nd operand */ |
| 1762 | dst = newVRegF(env); |
| 1763 | addInstr(env, s390_insn_move(size, dst, h1)); |
| 1764 | switch (op) { |
| 1765 | case Iop_AddF32: |
| 1766 | case Iop_AddF64: bfpop = S390_BFP_ADD; break; |
| 1767 | case Iop_SubF32: |
| 1768 | case Iop_SubF64: bfpop = S390_BFP_SUB; break; |
| 1769 | case Iop_MulF32: |
| 1770 | case Iop_MulF64: bfpop = S390_BFP_MUL; break; |
| 1771 | case Iop_DivF32: |
| 1772 | case Iop_DivF64: bfpop = S390_BFP_DIV; break; |
| 1773 | |
| 1774 | default: |
| 1775 | goto irreducible; |
| 1776 | } |
| 1777 | |
| 1778 | rounding_mode = decode_rounding_mode(expr->Iex.Triop.arg1); |
| 1779 | addInstr(env, s390_insn_bfp_binop(size, bfpop, dst, op2, rounding_mode)); |
| 1780 | return dst; |
| 1781 | } |
| 1782 | |
| 1783 | /* --------- BINARY OP --------- */ |
| 1784 | case Iex_Binop: { |
| 1785 | IROp op = expr->Iex.Binop.op; |
| 1786 | IRExpr *left = expr->Iex.Binop.arg2; |
| 1787 | HReg h1, dst; |
| 1788 | s390_bfp_unop_t bfpop; |
| 1789 | s390_round_t rounding_mode; |
| 1790 | Int integer_operand; |
| 1791 | |
| 1792 | integer_operand = 1; |
| 1793 | |
| 1794 | switch (op) { |
| 1795 | case Iop_SqrtF32: |
| 1796 | case Iop_SqrtF64: |
| 1797 | bfpop = S390_BFP_SQRT; |
| 1798 | integer_operand = 0; |
| 1799 | break; |
| 1800 | |
| 1801 | case Iop_F64toF32: |
| 1802 | bfpop = S390_BFP_F64_TO_F32; |
| 1803 | integer_operand = 0; |
| 1804 | break; |
| 1805 | |
| 1806 | case Iop_I32StoF32: bfpop = S390_BFP_I32_TO_F32; break; |
| 1807 | case Iop_I64StoF32: bfpop = S390_BFP_I64_TO_F32; break; |
| 1808 | case Iop_I64StoF64: bfpop = S390_BFP_I64_TO_F64; break; |
| 1809 | default: |
| 1810 | goto irreducible; |
| 1811 | |
| 1812 | case Iop_F128toF64: |
| 1813 | case Iop_F128toF32: { |
| 1814 | HReg op_hi, op_lo, f12, f13, f14, f15; |
| 1815 | |
| 1816 | bfpop = op == Iop_F128toF32 ? S390_BFP_F128_TO_F32 |
| 1817 | : S390_BFP_F128_TO_F64; |
| 1818 | |
| 1819 | rounding_mode = decode_rounding_mode(expr->Iex.Binop.arg1); |
| 1820 | |
| 1821 | s390_isel_float128_expr(&op_hi, &op_lo, env, expr->Iex.Binop.arg2); |
| 1822 | |
| 1823 | /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| 1824 | f12 = make_fpr(12); |
| 1825 | f13 = make_fpr(13); |
| 1826 | f14 = make_fpr(14); |
| 1827 | f15 = make_fpr(15); |
| 1828 | |
| 1829 | /* operand --> (f13, f15) */ |
| 1830 | addInstr(env, s390_insn_move(8, f13, op_hi)); |
| 1831 | addInstr(env, s390_insn_move(8, f15, op_lo)); |
| 1832 | |
| 1833 | dst = newVRegF(env); |
| 1834 | addInstr(env, s390_insn_bfp128_unop(16, bfpop, f12, f14, f13, f15, |
| 1835 | rounding_mode)); |
| 1836 | |
| 1837 | /* Move result to virtual destination registers */ |
| 1838 | addInstr(env, s390_insn_move(8, dst, f12)); |
| 1839 | return dst; |
| 1840 | } |
| 1841 | } |
| 1842 | |
| 1843 | /* Process operand */ |
| 1844 | if (integer_operand) { |
| 1845 | h1 = s390_isel_int_expr(env, left); |
| 1846 | } else { |
| 1847 | h1 = s390_isel_float_expr(env, left); |
| 1848 | } |
| 1849 | |
| 1850 | dst = newVRegF(env); |
| 1851 | rounding_mode = decode_rounding_mode(expr->Iex.Binop.arg1); |
| 1852 | addInstr(env, s390_insn_bfp_unop(size, bfpop, dst, h1, rounding_mode)); |
| 1853 | return dst; |
| 1854 | } |
| 1855 | |
| 1856 | /* --------- UNARY OP --------- */ |
| 1857 | case Iex_Unop: { |
| 1858 | IROp op = expr->Iex.Unop.op; |
| 1859 | IRExpr *left = expr->Iex.Unop.arg; |
| 1860 | s390_bfp_unop_t bfpop; |
| 1861 | s390_round_t rounding_mode; |
| 1862 | HReg h1, dst; |
| 1863 | |
| 1864 | if (op == Iop_F128HItoF64 || op == Iop_F128LOtoF64) { |
| 1865 | HReg dst_hi, dst_lo; |
| 1866 | |
| 1867 | s390_isel_float128_expr(&dst_hi, &dst_lo, env, left); |
| 1868 | return op == Iop_F128LOtoF64 ? dst_lo : dst_hi; |
| 1869 | } |
| 1870 | |
florian | 4d71a08 | 2011-12-18 00:08:17 +0000 | [diff] [blame] | 1871 | if (op == Iop_ReinterpI64asF64 || op == Iop_ReinterpI32asF32) { |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 1872 | dst = newVRegF(env); |
| 1873 | h1 = s390_isel_int_expr(env, left); /* Process the operand */ |
| 1874 | addInstr(env, s390_insn_move(size, dst, h1)); |
| 1875 | |
| 1876 | return dst; |
| 1877 | } |
| 1878 | |
| 1879 | switch (op) { |
| 1880 | case Iop_NegF32: |
| 1881 | case Iop_NegF64: |
| 1882 | if (left->tag == Iex_Unop && |
| 1883 | (left->Iex.Unop.op == Iop_AbsF32 || left->Iex.Unop.op == Iop_AbsF64)) |
| 1884 | bfpop = S390_BFP_NABS; |
| 1885 | else |
| 1886 | bfpop = S390_BFP_NEG; |
| 1887 | break; |
| 1888 | |
| 1889 | case Iop_AbsF32: |
| 1890 | case Iop_AbsF64: bfpop = S390_BFP_ABS; break; |
| 1891 | case Iop_I32StoF64: bfpop = S390_BFP_I32_TO_F64; break; |
| 1892 | case Iop_F32toF64: bfpop = S390_BFP_F32_TO_F64; break; |
| 1893 | default: |
| 1894 | goto irreducible; |
| 1895 | } |
| 1896 | |
| 1897 | /* Process operand */ |
| 1898 | if (op == Iop_I32StoF64) |
| 1899 | h1 = s390_isel_int_expr(env, left); |
| 1900 | else if (bfpop == S390_BFP_NABS) |
| 1901 | h1 = s390_isel_float_expr(env, left->Iex.Unop.arg); |
| 1902 | else |
| 1903 | h1 = s390_isel_float_expr(env, left); |
| 1904 | |
| 1905 | dst = newVRegF(env); |
| 1906 | rounding_mode = S390_ROUND_NEAREST_EVEN; /* will not be used later on */ |
| 1907 | addInstr(env, s390_insn_bfp_unop(size, bfpop, dst, h1, rounding_mode)); |
| 1908 | return dst; |
| 1909 | } |
| 1910 | |
| 1911 | default: |
| 1912 | goto irreducible; |
| 1913 | } |
| 1914 | |
| 1915 | /* We get here if no pattern matched. */ |
| 1916 | irreducible: |
| 1917 | ppIRExpr(expr); |
| 1918 | vpanic("s390_isel_float_expr: cannot reduce tree"); |
| 1919 | } |
| 1920 | |
| 1921 | |
| 1922 | static HReg |
| 1923 | s390_isel_float_expr(ISelEnv *env, IRExpr *expr) |
| 1924 | { |
| 1925 | HReg dst = s390_isel_float_expr_wrk(env, expr); |
| 1926 | |
| 1927 | /* Sanity checks ... */ |
| 1928 | vassert(hregClass(dst) == HRcFlt64); |
| 1929 | vassert(hregIsVirtual(dst)); |
| 1930 | |
| 1931 | return dst; |
| 1932 | } |
| 1933 | |
| 1934 | |
| 1935 | /*---------------------------------------------------------*/ |
| 1936 | /*--- ISEL: Condition Code ---*/ |
| 1937 | /*---------------------------------------------------------*/ |
| 1938 | |
| 1939 | /* This function handles all operators that produce a 1-bit result */ |
| 1940 | static s390_cc_t |
| 1941 | s390_isel_cc(ISelEnv *env, IRExpr *cond) |
| 1942 | { |
| 1943 | UChar size; |
| 1944 | |
| 1945 | vassert(typeOfIRExpr(env->type_env, cond) == Ity_I1); |
| 1946 | |
| 1947 | /* Constant: either 1 or 0 */ |
| 1948 | if (cond->tag == Iex_Const) { |
| 1949 | vassert(cond->Iex.Const.con->tag == Ico_U1); |
| 1950 | vassert(cond->Iex.Const.con->Ico.U1 == True |
| 1951 | || cond->Iex.Const.con->Ico.U1 == False); |
| 1952 | |
| 1953 | return cond->Iex.Const.con->Ico.U1 == True ? S390_CC_ALWAYS : S390_CC_NEVER; |
| 1954 | } |
| 1955 | |
| 1956 | /* Variable: values are 1 or 0 */ |
| 1957 | if (cond->tag == Iex_RdTmp) { |
| 1958 | IRTemp tmp = cond->Iex.RdTmp.tmp; |
| 1959 | HReg reg = lookupIRTemp(env, tmp); |
| 1960 | |
| 1961 | /* Load-and-test does not modify REG; so this is OK. */ |
| 1962 | if (typeOfIRTemp(env->type_env, tmp) == Ity_I1) |
| 1963 | size = 4; |
| 1964 | else |
| 1965 | size = sizeofIRType(typeOfIRTemp(env->type_env, tmp)); |
| 1966 | addInstr(env, s390_insn_test(size, s390_opnd_reg(reg))); |
| 1967 | return S390_CC_NE; |
| 1968 | } |
| 1969 | |
| 1970 | /* Unary operators */ |
| 1971 | if (cond->tag == Iex_Unop) { |
| 1972 | IRExpr *arg = cond->Iex.Unop.arg; |
| 1973 | |
| 1974 | switch (cond->Iex.Unop.op) { |
| 1975 | case Iop_Not1: /* Not1(cond) */ |
| 1976 | /* Generate code for EXPR, and negate the test condition */ |
| 1977 | return s390_cc_invert(s390_isel_cc(env, arg)); |
| 1978 | |
| 1979 | /* Iop_32/64to1 select the LSB from their operand */ |
| 1980 | case Iop_32to1: |
| 1981 | case Iop_64to1: { |
| 1982 | HReg dst = s390_isel_int_expr(env, arg); |
| 1983 | |
| 1984 | size = sizeofIRType(typeOfIRExpr(env->type_env, arg)); |
| 1985 | |
| 1986 | addInstr(env, s390_insn_alu(size, S390_ALU_AND, dst, s390_opnd_imm(1))); |
| 1987 | addInstr(env, s390_insn_test(size, s390_opnd_reg(dst))); |
| 1988 | return S390_CC_NE; |
| 1989 | } |
| 1990 | |
| 1991 | case Iop_CmpNEZ8: |
| 1992 | case Iop_CmpNEZ16: { |
| 1993 | s390_opnd_RMI src; |
| 1994 | s390_unop_t op; |
| 1995 | HReg dst; |
| 1996 | |
| 1997 | op = (cond->Iex.Unop.op == Iop_CmpNEZ8) ? S390_ZERO_EXTEND_8 |
| 1998 | : S390_ZERO_EXTEND_16; |
| 1999 | dst = newVRegI(env); |
| 2000 | src = s390_isel_int_expr_RMI(env, arg); |
| 2001 | addInstr(env, s390_insn_unop(4, op, dst, src)); |
| 2002 | addInstr(env, s390_insn_test(4, s390_opnd_reg(dst))); |
| 2003 | return S390_CC_NE; |
| 2004 | } |
| 2005 | |
| 2006 | case Iop_CmpNEZ32: |
| 2007 | case Iop_CmpNEZ64: { |
| 2008 | s390_opnd_RMI src; |
| 2009 | |
| 2010 | src = s390_isel_int_expr_RMI(env, arg); |
| 2011 | size = sizeofIRType(typeOfIRExpr(env->type_env, arg)); |
| 2012 | addInstr(env, s390_insn_test(size, src)); |
| 2013 | return S390_CC_NE; |
| 2014 | } |
| 2015 | |
| 2016 | default: |
| 2017 | goto fail; |
| 2018 | } |
| 2019 | } |
| 2020 | |
| 2021 | /* Binary operators */ |
| 2022 | if (cond->tag == Iex_Binop) { |
| 2023 | IRExpr *arg1 = cond->Iex.Binop.arg1; |
| 2024 | IRExpr *arg2 = cond->Iex.Binop.arg2; |
| 2025 | HReg reg1, reg2; |
| 2026 | |
| 2027 | size = sizeofIRType(typeOfIRExpr(env->type_env, arg1)); |
| 2028 | |
| 2029 | switch (cond->Iex.Binop.op) { |
| 2030 | s390_unop_t op; |
| 2031 | s390_cc_t result; |
| 2032 | |
| 2033 | case Iop_CmpEQ8: |
| 2034 | case Iop_CasCmpEQ8: |
| 2035 | op = S390_ZERO_EXTEND_8; |
| 2036 | result = S390_CC_E; |
| 2037 | goto do_compare_ze; |
| 2038 | |
| 2039 | case Iop_CmpNE8: |
| 2040 | case Iop_CasCmpNE8: |
| 2041 | op = S390_ZERO_EXTEND_8; |
| 2042 | result = S390_CC_NE; |
| 2043 | goto do_compare_ze; |
| 2044 | |
| 2045 | case Iop_CmpEQ16: |
| 2046 | case Iop_CasCmpEQ16: |
| 2047 | op = S390_ZERO_EXTEND_16; |
| 2048 | result = S390_CC_E; |
| 2049 | goto do_compare_ze; |
| 2050 | |
| 2051 | case Iop_CmpNE16: |
| 2052 | case Iop_CasCmpNE16: |
| 2053 | op = S390_ZERO_EXTEND_16; |
| 2054 | result = S390_CC_NE; |
| 2055 | goto do_compare_ze; |
| 2056 | |
| 2057 | do_compare_ze: { |
| 2058 | s390_opnd_RMI op1, op2; |
| 2059 | |
| 2060 | op1 = s390_isel_int_expr_RMI(env, arg1); |
| 2061 | reg1 = newVRegI(env); |
| 2062 | addInstr(env, s390_insn_unop(4, op, reg1, op1)); |
| 2063 | |
| 2064 | op2 = s390_isel_int_expr_RMI(env, arg2); |
| 2065 | reg2 = newVRegI(env); |
| 2066 | addInstr(env, s390_insn_unop(4, op, reg2, op2)); /* zero extend */ |
| 2067 | |
| 2068 | op2 = s390_opnd_reg(reg2); |
| 2069 | addInstr(env, s390_insn_compare(4, reg1, op2, False)); |
| 2070 | |
| 2071 | return result; |
| 2072 | } |
| 2073 | |
| 2074 | case Iop_CmpEQ32: |
| 2075 | case Iop_CmpEQ64: |
| 2076 | case Iop_CasCmpEQ32: |
| 2077 | case Iop_CasCmpEQ64: |
| 2078 | result = S390_CC_E; |
| 2079 | goto do_compare; |
| 2080 | |
| 2081 | case Iop_CmpNE32: |
| 2082 | case Iop_CmpNE64: |
| 2083 | case Iop_CasCmpNE32: |
| 2084 | case Iop_CasCmpNE64: |
| 2085 | result = S390_CC_NE; |
| 2086 | goto do_compare; |
| 2087 | |
| 2088 | do_compare: { |
| 2089 | HReg op1; |
| 2090 | s390_opnd_RMI op2; |
| 2091 | |
| 2092 | order_commutative_operands(arg1, arg2); |
| 2093 | |
| 2094 | op1 = s390_isel_int_expr(env, arg1); |
| 2095 | op2 = s390_isel_int_expr_RMI(env, arg2); |
| 2096 | |
| 2097 | addInstr(env, s390_insn_compare(size, op1, op2, False)); |
| 2098 | |
| 2099 | return result; |
| 2100 | } |
| 2101 | |
| 2102 | case Iop_CmpLT32S: |
| 2103 | case Iop_CmpLE32S: |
| 2104 | case Iop_CmpLT64S: |
| 2105 | case Iop_CmpLE64S: { |
| 2106 | HReg op1; |
| 2107 | s390_opnd_RMI op2; |
| 2108 | |
| 2109 | op1 = s390_isel_int_expr(env, arg1); |
| 2110 | op2 = s390_isel_int_expr_RMI(env, arg2); |
| 2111 | |
| 2112 | addInstr(env, s390_insn_compare(size, op1, op2, True)); |
| 2113 | |
| 2114 | return (cond->Iex.Binop.op == Iop_CmpLT32S || |
| 2115 | cond->Iex.Binop.op == Iop_CmpLT64S) ? S390_CC_L : S390_CC_LE; |
| 2116 | } |
| 2117 | |
| 2118 | case Iop_CmpLT32U: |
| 2119 | case Iop_CmpLE32U: |
| 2120 | case Iop_CmpLT64U: |
| 2121 | case Iop_CmpLE64U: { |
| 2122 | HReg op1; |
| 2123 | s390_opnd_RMI op2; |
| 2124 | |
| 2125 | op1 = s390_isel_int_expr(env, arg1); |
| 2126 | op2 = s390_isel_int_expr_RMI(env, arg2); |
| 2127 | |
| 2128 | addInstr(env, s390_insn_compare(size, op1, op2, False)); |
| 2129 | |
| 2130 | return (cond->Iex.Binop.op == Iop_CmpLT32U || |
| 2131 | cond->Iex.Binop.op == Iop_CmpLT64U) ? S390_CC_L : S390_CC_LE; |
| 2132 | } |
| 2133 | |
| 2134 | default: |
| 2135 | goto fail; |
| 2136 | } |
| 2137 | } |
| 2138 | |
| 2139 | fail: |
| 2140 | ppIRExpr(cond); |
| 2141 | vpanic("s390_isel_cc: unexpected operator"); |
| 2142 | } |
| 2143 | |
| 2144 | |
| 2145 | /*---------------------------------------------------------*/ |
| 2146 | /*--- ISEL: Statements ---*/ |
| 2147 | /*---------------------------------------------------------*/ |
| 2148 | |
| 2149 | static void |
| 2150 | s390_isel_stmt(ISelEnv *env, IRStmt *stmt) |
| 2151 | { |
| 2152 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 2153 | vex_printf("\n -- "); |
| 2154 | ppIRStmt(stmt); |
| 2155 | vex_printf("\n"); |
| 2156 | } |
| 2157 | |
| 2158 | switch (stmt->tag) { |
| 2159 | |
| 2160 | /* --------- STORE --------- */ |
| 2161 | case Ist_Store: { |
| 2162 | IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.Store.data); |
| 2163 | s390_amode *am; |
| 2164 | HReg src; |
| 2165 | |
| 2166 | if (stmt->Ist.Store.end != Iend_BE) goto stmt_fail; |
| 2167 | |
| 2168 | am = s390_isel_amode(env, stmt->Ist.Store.addr); |
| 2169 | |
| 2170 | switch (tyd) { |
| 2171 | case Ity_I8: |
| 2172 | case Ity_I16: |
| 2173 | case Ity_I32: |
| 2174 | case Ity_I64: |
| 2175 | src = s390_isel_int_expr(env, stmt->Ist.Store.data); |
| 2176 | break; |
| 2177 | |
| 2178 | case Ity_F32: |
| 2179 | case Ity_F64: |
| 2180 | src = s390_isel_float_expr(env, stmt->Ist.Store.data); |
| 2181 | break; |
| 2182 | |
| 2183 | case Ity_F128: |
| 2184 | /* Cannot occur. No such instruction */ |
| 2185 | vpanic("Ist_Store with F128 data"); |
| 2186 | |
| 2187 | default: |
| 2188 | goto stmt_fail; |
| 2189 | } |
| 2190 | |
| 2191 | addInstr(env, s390_insn_store(sizeofIRType(tyd), am, src)); |
| 2192 | return; |
| 2193 | } |
| 2194 | |
| 2195 | /* --------- PUT --------- */ |
| 2196 | case Ist_Put: { |
| 2197 | IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.Put.data); |
| 2198 | HReg src; |
| 2199 | s390_amode *am; |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 2200 | ULong new_value, old_value, difference; |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2201 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 2202 | /* Detect updates to certain guest registers. We track the contents |
| 2203 | of those registers as long as they contain constants. If the new |
| 2204 | constant is either zero or in the 8-bit neighbourhood of the |
| 2205 | current value we can use a memory-to-memory insn to do the update. */ |
| 2206 | |
| 2207 | Int offset = stmt->Ist.Put.offset; |
| 2208 | |
| 2209 | /* Check necessary conditions: |
| 2210 | (1) must be one of the registers we care about |
| 2211 | (2) assigned value must be a constant */ |
| 2212 | Int guest_reg = get_guest_reg(offset); |
| 2213 | |
| 2214 | if (guest_reg == GUEST_UNKNOWN) goto not_special; |
| 2215 | |
| 2216 | if (guest_reg == GUEST_IA) { |
| 2217 | /* If this is the first assignment to the IA reg, don't special case |
| 2218 | it. We need to do a full 8-byte assignment here. The reason is |
| 2219 | that in case of a redirected translation the guest IA does not |
| 2220 | contain the redirected-to address. Instead it contains the |
| 2221 | redirected-from address and those can be far apart. So in order to |
| 2222 | do incremnetal updates if the IA in the future we need to get the |
| 2223 | initial address of the super block correct. */ |
| 2224 | if (env->first_IA_assignment) { |
| 2225 | env->first_IA_assignment = False; |
| 2226 | goto not_special; |
| 2227 | } |
| 2228 | } |
| 2229 | |
| 2230 | if (stmt->Ist.Put.data->tag != Iex_Const) { |
| 2231 | /* Invalidate guest register contents */ |
| 2232 | env->old_value_valid[guest_reg] = False; |
| 2233 | goto not_special; |
| 2234 | } |
| 2235 | |
| 2236 | /* OK. Necessary conditions are satisfied. */ |
| 2237 | |
| 2238 | /* Get the old value and update it */ |
| 2239 | vassert(tyd == Ity_I64); |
| 2240 | |
| 2241 | old_value = env->old_value[guest_reg]; |
| 2242 | new_value = stmt->Ist.Put.data->Iex.Const.con->Ico.U64; |
| 2243 | env->old_value[guest_reg] = new_value; |
| 2244 | |
| 2245 | Bool old_value_is_valid = env->old_value_valid[guest_reg]; |
| 2246 | env->old_value_valid[guest_reg] = True; |
| 2247 | |
| 2248 | /* If the register already contains the new value, there is nothing |
| 2249 | to do here. Unless the guest register requires precise memory |
| 2250 | exceptions. */ |
| 2251 | if (old_value_is_valid && new_value == old_value) { |
| 2252 | if (! guest_s390x_state_requires_precise_mem_exns(offset, offset + 8)) { |
| 2253 | return; |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | /* guest register = 0 */ |
| 2258 | if (new_value == 0) { |
| 2259 | addInstr(env, s390_insn_gzero(sizeofIRType(tyd), offset)); |
| 2260 | return; |
| 2261 | } |
| 2262 | |
| 2263 | if (old_value_is_valid == False) goto not_special; |
| 2264 | |
| 2265 | /* If the new value is in the neighbourhood of the old value |
| 2266 | we can use a memory-to-memory insn */ |
| 2267 | difference = new_value - old_value; |
| 2268 | |
| 2269 | if (s390_host_has_gie && ulong_fits_signed_8bit(difference)) { |
| 2270 | addInstr(env, s390_insn_gadd(sizeofIRType(tyd), offset, |
| 2271 | (difference & 0xFF), new_value)); |
| 2272 | return; |
| 2273 | } |
| 2274 | |
| 2275 | /* If the high word is the same it is sufficient to load the low word. |
| 2276 | Use R0 as a scratch reg. */ |
| 2277 | if ((old_value >> 32) == (new_value >> 32)) { |
| 2278 | HReg r0 = make_gpr(env, 0); |
| 2279 | HReg gsp = make_gpr(env, S390_REGNO_GUEST_STATE_POINTER); |
| 2280 | s390_amode *gam; |
| 2281 | |
| 2282 | gam = s390_amode_b12(offset + 4, gsp); |
| 2283 | addInstr(env, s390_insn_load_immediate(4, r0, |
| 2284 | new_value & 0xFFFFFFFF)); |
| 2285 | addInstr(env, s390_insn_store(4, gam, r0)); |
| 2286 | return; |
| 2287 | } |
| 2288 | |
| 2289 | /* No special case applies... fall through */ |
| 2290 | |
| 2291 | not_special: |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2292 | am = s390_amode_for_guest_state(stmt->Ist.Put.offset); |
| 2293 | |
| 2294 | switch (tyd) { |
| 2295 | case Ity_I8: |
| 2296 | case Ity_I16: |
| 2297 | case Ity_I32: |
| 2298 | case Ity_I64: |
| 2299 | src = s390_isel_int_expr(env, stmt->Ist.Put.data); |
| 2300 | break; |
| 2301 | |
| 2302 | case Ity_F32: |
| 2303 | case Ity_F64: |
| 2304 | src = s390_isel_float_expr(env, stmt->Ist.Put.data); |
| 2305 | break; |
| 2306 | |
| 2307 | case Ity_F128: |
| 2308 | /* Does not occur. See function put_fpr_pair. */ |
| 2309 | vpanic("Ist_Put with F128 data"); |
| 2310 | |
| 2311 | default: |
| 2312 | goto stmt_fail; |
| 2313 | } |
| 2314 | |
| 2315 | addInstr(env, s390_insn_store(sizeofIRType(tyd), am, src)); |
| 2316 | return; |
| 2317 | } |
| 2318 | |
| 2319 | /* --------- TMP --------- */ |
| 2320 | case Ist_WrTmp: { |
| 2321 | IRTemp tmp = stmt->Ist.WrTmp.tmp; |
| 2322 | IRType tyd = typeOfIRTemp(env->type_env, tmp); |
| 2323 | HReg src, dst; |
| 2324 | |
| 2325 | switch (tyd) { |
| 2326 | case Ity_I128: { |
| 2327 | HReg dst_hi, dst_lo, res_hi, res_lo; |
| 2328 | |
| 2329 | s390_isel_int128_expr(&res_hi, &res_lo, env, stmt->Ist.WrTmp.data); |
| 2330 | lookupIRTemp128(&dst_hi, &dst_lo, env, tmp); |
| 2331 | |
| 2332 | addInstr(env, s390_insn_move(8, dst_hi, res_hi)); |
| 2333 | addInstr(env, s390_insn_move(8, dst_lo, res_lo)); |
| 2334 | return; |
| 2335 | } |
| 2336 | |
| 2337 | case Ity_I8: |
| 2338 | case Ity_I16: |
| 2339 | case Ity_I32: |
| 2340 | case Ity_I64: |
| 2341 | src = s390_isel_int_expr(env, stmt->Ist.WrTmp.data); |
| 2342 | dst = lookupIRTemp(env, tmp); |
| 2343 | break; |
| 2344 | |
| 2345 | case Ity_I1: { |
| 2346 | s390_cc_t cond = s390_isel_cc(env, stmt->Ist.WrTmp.data); |
| 2347 | dst = lookupIRTemp(env, tmp); |
| 2348 | addInstr(env, s390_insn_cc2bool(dst, cond)); |
| 2349 | return; |
| 2350 | } |
| 2351 | |
| 2352 | case Ity_F32: |
| 2353 | case Ity_F64: |
| 2354 | src = s390_isel_float_expr(env, stmt->Ist.WrTmp.data); |
| 2355 | dst = lookupIRTemp(env, tmp); |
| 2356 | break; |
| 2357 | |
| 2358 | case Ity_F128: { |
| 2359 | HReg dst_hi, dst_lo, res_hi, res_lo; |
| 2360 | |
| 2361 | s390_isel_float128_expr(&res_hi, &res_lo, env, stmt->Ist.WrTmp.data); |
| 2362 | lookupIRTemp128(&dst_hi, &dst_lo, env, tmp); |
| 2363 | |
| 2364 | addInstr(env, s390_insn_move(8, dst_hi, res_hi)); |
| 2365 | addInstr(env, s390_insn_move(8, dst_lo, res_lo)); |
| 2366 | return; |
| 2367 | } |
| 2368 | |
| 2369 | default: |
| 2370 | goto stmt_fail; |
| 2371 | } |
| 2372 | |
| 2373 | addInstr(env, s390_insn_move(sizeofIRType(tyd), dst, src)); |
| 2374 | return; |
| 2375 | } |
| 2376 | |
| 2377 | /* --------- Call to DIRTY helper --------- */ |
| 2378 | case Ist_Dirty: { |
| 2379 | IRType retty; |
| 2380 | IRDirty* d = stmt->Ist.Dirty.details; |
| 2381 | Bool passBBP; |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 2382 | Int i; |
| 2383 | |
| 2384 | /* Invalidate tracked values of those guest state registers that are |
| 2385 | modified by this helper. */ |
| 2386 | for (i = 0; i < d->nFxState; ++i) { |
| 2387 | if ((d->fxState[i].fx == Ifx_Write || d->fxState[i].fx == Ifx_Modify)) { |
| 2388 | Int guest_reg = get_guest_reg(d->fxState[i].offset); |
| 2389 | if (guest_reg != GUEST_UNKNOWN) |
| 2390 | env->old_value_valid[guest_reg] = False; |
| 2391 | } |
| 2392 | } |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2393 | |
| 2394 | if (d->nFxState == 0) |
| 2395 | vassert(!d->needsBBP); |
| 2396 | |
| 2397 | passBBP = toBool(d->nFxState > 0 && d->needsBBP); |
| 2398 | |
| 2399 | doHelperCall(env, passBBP, d->guard, d->cee, d->args); |
| 2400 | |
| 2401 | /* Now figure out what to do with the returned value, if any. */ |
| 2402 | if (d->tmp == IRTemp_INVALID) |
| 2403 | /* No return value. Nothing to do. */ |
| 2404 | return; |
| 2405 | |
| 2406 | retty = typeOfIRTemp(env->type_env, d->tmp); |
| 2407 | if (retty == Ity_I64 || retty == Ity_I32 |
| 2408 | || retty == Ity_I16 || retty == Ity_I8) { |
| 2409 | /* Move the returned value into the return register */ |
| 2410 | HReg dst = lookupIRTemp(env, d->tmp); |
| 2411 | addInstr(env, s390_insn_move(sizeofIRType(retty), dst, |
| 2412 | mkHReg(S390_REGNO_RETURN_VALUE, |
| 2413 | HRcInt64, False))); |
| 2414 | return; |
| 2415 | } |
| 2416 | break; |
| 2417 | } |
| 2418 | |
| 2419 | case Ist_CAS: |
| 2420 | if (stmt->Ist.CAS.details->oldHi == IRTemp_INVALID) { |
| 2421 | IRCAS *cas = stmt->Ist.CAS.details; |
| 2422 | s390_amode *op2 = s390_isel_amode(env, cas->addr); |
| 2423 | HReg op3 = s390_isel_int_expr(env, cas->dataLo); /* new value */ |
| 2424 | HReg op1 = s390_isel_int_expr(env, cas->expdLo); /* expected value */ |
| 2425 | HReg old = lookupIRTemp(env, cas->oldLo); |
| 2426 | |
| 2427 | if (typeOfIRTemp(env->type_env, cas->oldLo) == Ity_I32) { |
| 2428 | addInstr(env, s390_insn_cas(4, op1, op2, op3, old)); |
| 2429 | } else { |
| 2430 | addInstr(env, s390_insn_cas(8, op1, op2, op3, old)); |
| 2431 | } |
| 2432 | return; |
| 2433 | } else { |
| 2434 | vpanic("compare double and swap not implemented\n"); |
| 2435 | } |
| 2436 | break; |
| 2437 | |
| 2438 | /* --------- EXIT --------- */ |
| 2439 | case Ist_Exit: { |
| 2440 | s390_opnd_RMI dst; |
| 2441 | s390_cc_t cond; |
| 2442 | IRConstTag tag = stmt->Ist.Exit.dst->tag; |
| 2443 | |
| 2444 | if (tag != Ico_U64) |
| 2445 | vpanic("s390_isel_stmt: Ist_Exit: dst is not a 64-bit value"); |
| 2446 | |
| 2447 | dst = s390_isel_int_expr_RMI(env, IRExpr_Const(stmt->Ist.Exit.dst)); |
| 2448 | cond = s390_isel_cc(env, stmt->Ist.Exit.guard); |
| 2449 | addInstr(env, s390_insn_branch(stmt->Ist.Exit.jk, cond, dst)); |
| 2450 | return; |
| 2451 | } |
| 2452 | |
| 2453 | /* --------- MEM FENCE --------- */ |
sewardj | a52e37e | 2011-04-28 18:48:06 +0000 | [diff] [blame] | 2454 | case Ist_MBE: |
| 2455 | switch (stmt->Ist.MBE.event) { |
| 2456 | case Imbe_Fence: |
| 2457 | addInstr(env, s390_insn_mfence()); |
| 2458 | return; |
| 2459 | default: |
| 2460 | break; |
| 2461 | } |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2462 | break; |
| 2463 | |
| 2464 | /* --------- Miscellaneous --------- */ |
| 2465 | |
| 2466 | case Ist_PutI: /* Not needed */ |
| 2467 | case Ist_IMark: /* Doesn't generate any executable code */ |
| 2468 | case Ist_NoOp: /* Doesn't generate any executable code */ |
| 2469 | case Ist_AbiHint: /* Meaningless in IR */ |
| 2470 | return; |
| 2471 | |
| 2472 | default: |
| 2473 | break; |
| 2474 | } |
| 2475 | |
| 2476 | stmt_fail: |
| 2477 | ppIRStmt(stmt); |
| 2478 | vpanic("s390_isel_stmt"); |
| 2479 | } |
| 2480 | |
| 2481 | |
| 2482 | /*---------------------------------------------------------*/ |
| 2483 | /*--- ISEL: Basic block terminators (Nexts) ---*/ |
| 2484 | /*---------------------------------------------------------*/ |
| 2485 | |
| 2486 | static void |
| 2487 | iselNext(ISelEnv *env, IRExpr *next, IRJumpKind jk) |
| 2488 | { |
| 2489 | s390_opnd_RMI dst; |
| 2490 | |
| 2491 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 2492 | vex_printf("\n-- goto {"); |
| 2493 | ppIRJumpKind(jk); |
| 2494 | vex_printf("} "); |
| 2495 | ppIRExpr(next); |
| 2496 | vex_printf("\n"); |
| 2497 | } |
| 2498 | |
| 2499 | dst = s390_isel_int_expr_RMI(env, next); |
| 2500 | addInstr(env, s390_insn_branch(jk, S390_CC_ALWAYS, dst)); |
| 2501 | } |
| 2502 | |
| 2503 | |
| 2504 | /*---------------------------------------------------------*/ |
| 2505 | /*--- Insn selector top-level ---*/ |
| 2506 | /*---------------------------------------------------------*/ |
| 2507 | |
| 2508 | /* Translate an entire SB to s390 code. */ |
| 2509 | |
| 2510 | HInstrArray * |
| 2511 | iselSB_S390(IRSB *bb, VexArch arch_host, VexArchInfo *archinfo_host, |
| 2512 | VexAbiInfo *vbi) |
| 2513 | { |
| 2514 | UInt i, j; |
| 2515 | HReg hreg, hregHI; |
| 2516 | ISelEnv *env; |
| 2517 | UInt hwcaps_host = archinfo_host->hwcaps; |
| 2518 | |
| 2519 | /* KLUDGE: export archinfo_host. */ |
| 2520 | s390_archinfo_host = archinfo_host; |
| 2521 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2522 | /* Do some sanity checks */ |
sewardj | 652b56a | 2011-04-13 15:38:17 +0000 | [diff] [blame] | 2523 | vassert((VEX_HWCAPS_S390X(hwcaps_host) & ~(VEX_HWCAPS_S390X_ALL)) == 0); |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2524 | |
| 2525 | /* Make up an initial environment to use. */ |
| 2526 | env = LibVEX_Alloc(sizeof(ISelEnv)); |
| 2527 | env->vreg_ctr = 0; |
| 2528 | |
| 2529 | /* Set up output code array. */ |
| 2530 | env->code = newHInstrArray(); |
| 2531 | |
| 2532 | /* Copy BB's type env. */ |
| 2533 | env->type_env = bb->tyenv; |
| 2534 | |
florian | ad43b3a | 2012-02-20 15:01:14 +0000 | [diff] [blame] | 2535 | /* Set up data structures for tracking guest register values. */ |
| 2536 | env->first_IA_assignment = True; |
| 2537 | for (i = 0; i < NUM_TRACKED_REGS; ++i) { |
| 2538 | env->old_value[i] = 0; /* just something to have a defined value */ |
| 2539 | env->old_value_valid[i] = False; |
| 2540 | } |
| 2541 | |
sewardj | 2019a97 | 2011-03-07 16:04:07 +0000 | [diff] [blame] | 2542 | /* Make up an IRTemp -> virtual HReg mapping. This doesn't |
| 2543 | change as we go along. For some reason types_used has Int type -- but |
| 2544 | it should be unsigned. Internally we use an unsigned type; so we |
| 2545 | assert it here. */ |
| 2546 | vassert(bb->tyenv->types_used >= 0); |
| 2547 | |
| 2548 | env->n_vregmap = bb->tyenv->types_used; |
| 2549 | env->vregmap = LibVEX_Alloc(env->n_vregmap * sizeof(HReg)); |
| 2550 | env->vregmapHI = LibVEX_Alloc(env->n_vregmap * sizeof(HReg)); |
| 2551 | |
| 2552 | /* and finally ... */ |
| 2553 | env->hwcaps = hwcaps_host; |
| 2554 | |
| 2555 | /* For each IR temporary, allocate a suitably-kinded virtual |
| 2556 | register. */ |
| 2557 | j = 0; |
| 2558 | for (i = 0; i < env->n_vregmap; i++) { |
| 2559 | hregHI = hreg = INVALID_HREG; |
| 2560 | switch (bb->tyenv->types[i]) { |
| 2561 | case Ity_I1: |
| 2562 | case Ity_I8: |
| 2563 | case Ity_I16: |
| 2564 | case Ity_I32: |
| 2565 | hreg = mkHReg(j++, HRcInt64, True); |
| 2566 | break; |
| 2567 | |
| 2568 | case Ity_I64: |
| 2569 | hreg = mkHReg(j++, HRcInt64, True); |
| 2570 | break; |
| 2571 | |
| 2572 | case Ity_I128: |
| 2573 | hreg = mkHReg(j++, HRcInt64, True); |
| 2574 | hregHI = mkHReg(j++, HRcInt64, True); |
| 2575 | break; |
| 2576 | |
| 2577 | case Ity_F32: |
| 2578 | case Ity_F64: |
| 2579 | hreg = mkHReg(j++, HRcFlt64, True); |
| 2580 | break; |
| 2581 | |
| 2582 | case Ity_F128: |
| 2583 | hreg = mkHReg(j++, HRcFlt64, True); |
| 2584 | hregHI = mkHReg(j++, HRcFlt64, True); |
| 2585 | break; |
| 2586 | |
| 2587 | case Ity_V128: /* fall through */ |
| 2588 | default: |
| 2589 | ppIRType(bb->tyenv->types[i]); |
| 2590 | vpanic("s390_isel_sb: IRTemp type"); |
| 2591 | } |
| 2592 | |
| 2593 | env->vregmap[i] = hreg; |
| 2594 | env->vregmapHI[i] = hregHI; |
| 2595 | } |
| 2596 | env->vreg_ctr = j; |
| 2597 | |
| 2598 | /* Ok, finally we can iterate over the statements. */ |
| 2599 | for (i = 0; i < bb->stmts_used; i++) |
| 2600 | if (bb->stmts[i]) |
| 2601 | s390_isel_stmt(env, bb->stmts[i]); |
| 2602 | |
| 2603 | iselNext(env, bb->next, bb->jumpkind); |
| 2604 | |
| 2605 | /* Record the number of vregs we used. */ |
| 2606 | env->code->n_vregs = env->vreg_ctr; |
| 2607 | |
| 2608 | return env->code; |
| 2609 | } |
| 2610 | |
| 2611 | /*---------------------------------------------------------------*/ |
| 2612 | /*--- end host_s390_isel.c ---*/ |
| 2613 | /*---------------------------------------------------------------*/ |