mono/mini/inssel-x86.brg

   1 %%
   2
   3 #
   4 # inssel-x86.brg: burg file for special x86 instructions
   5 #
   6 # Author:
   7 #   Dietmar Maurer (dietmar@ximian.com)
   8 #   Paolo Molaro (lupus@ximian.com)
   9 #
  10 # (C) 2002 Ximian, Inc.
  11 #
  12
  13 stmt: OP_START_HANDLER {
  14         MONO_EMIT_NEW_STORE_MEMBASE (s, OP_STORE_MEMBASE_REG, s->spvar->inst_basereg, s->spvar->inst_offset, X86_ESP);
  15 }
  16
  17 stmt: CEE_ENDFINALLY {
  18         MONO_EMIT_NEW_LOAD_MEMBASE (s, X86_ESP, s->spvar->inst_basereg, s->spvar->inst_offset);
  19         tree->opcode = CEE_RET;
  20         mono_bblock_add_inst (s->cbb, tree);
  21 }
  22
  23 stmt: OP_ENDFILTER (reg) {
  24         MONO_EMIT_NEW_UNALU (s, OP_MOVE, X86_EAX, state->left->reg1);
  25         MONO_EMIT_NEW_LOAD_MEMBASE (s, X86_ESP, s->spvar->inst_basereg, s->spvar->inst_offset);
  26         tree->opcode = CEE_RET;
  27         mono_bblock_add_inst (s->cbb, tree);
  28 }
  29
  30 stmt: CEE_STIND_I8 (OP_REGVAR, lreg) {
  31         /* this should only happen for methods returning a long */
  32         MONO_EMIT_NEW_UNALU (s, OP_MOVE, X86_EAX, state->right->reg1);
  33         MONO_EMIT_NEW_UNALU (s, OP_MOVE, X86_EDX, state->right->reg2);
  34 }
  35
  36 lreg: OP_LNEG (lreg) "3" {
  37         int tmpr = mono_regstate_next_int (s->rs);
  38         MONO_EMIT_NEW_UNALU (s, CEE_NEG, state->reg1, state->left->reg1);
  39         MONO_EMIT_BIALU_IMM (s, tree, OP_ADC_IMM, tmpr, state->left->reg2, 0);
  40         MONO_EMIT_NEW_UNALU (s, CEE_NEG, state->reg2, tmpr);
  41 }
  42
  43 freg: OP_LCONV_TO_R8 (lreg) {
  44         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg2);
  45         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg1);
  46         tree->opcode = OP_X86_FP_LOAD_I8;
  47         tree->inst_basereg = X86_ESP;
  48         tree->inst_offset = 0;
  49         mono_bblock_add_inst (s->cbb, tree);
  50         MONO_EMIT_NEW_BIALU_IMM (s, OP_ADD_IMM, X86_ESP, X86_ESP, 8);
  51 }
  52
  53 freg: OP_LCONV_TO_R4 (lreg) {
  54         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg2);
  55         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg1);
  56         tree->opcode = OP_X86_FP_LOAD_I8;
  57         tree->inst_basereg = X86_ESP;
  58         tree->inst_offset = 0;
  59         mono_bblock_add_inst (s->cbb, tree);
  60         /* change precision */
  61         MONO_EMIT_NEW_STORE_MEMBASE (s, OP_STORER4_MEMBASE_REG, X86_ESP, 0, state->reg1);
  62         MONO_EMIT_NEW_LOAD_MEMBASE_OP (s, OP_LOADR4_MEMBASE, state->reg1, X86_ESP, 0);
  63         MONO_EMIT_NEW_BIALU_IMM (s, OP_ADD_IMM, X86_ESP, X86_ESP, 8);
  64 }
  65
  66 freg: CEE_CONV_R_UN (reg) {
  67         MONO_EMIT_NEW_BIALU_IMM (s, OP_X86_PUSH_IMM, -1, -1, 0);
  68         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg1);
  69         tree->opcode = OP_X86_FP_LOAD_I8;
  70         tree->inst_basereg = X86_ESP;
  71         tree->inst_offset = 0;
  72         mono_bblock_add_inst (s->cbb, tree);
  73         MONO_EMIT_NEW_BIALU_IMM (s, OP_ADD_IMM, X86_ESP, X86_ESP, 8);
  74 }
  75
  76 cflags: OP_COMPARE (CEE_LDIND_I4 (base), reg) {
  77         tree->opcode = OP_X86_COMPARE_MEMBASE_REG;
  78         tree->inst_basereg = state->left->left->tree->inst_basereg;
  79         tree->inst_offset = state->left->left->tree->inst_offset;
  80         tree->sreg2 = state->right->reg1;
  81         mono_bblock_add_inst (s->cbb, tree);
  82 }
  83
  84 cflags: OP_COMPARE (CEE_LDIND_I4 (base), OP_ICONST) {
  85         tree->opcode = OP_X86_COMPARE_MEMBASE_IMM;
  86         tree->inst_basereg = state->left->left->tree->inst_basereg;
  87         tree->inst_offset = state->left->left->tree->inst_offset;
  88         tree->inst_imm = state->right->tree->inst_c0;
  89         mono_bblock_add_inst (s->cbb, tree);
  90 }
  91
  92 cflags: OP_COMPARE (reg, CEE_LDIND_I4 (base)) {
  93         tree->opcode = OP_X86_COMPARE_REG_MEMBASE;
  94         tree->sreg2 = state->right->left->tree->inst_basereg;
  95         tree->inst_offset = state->right->left->tree->inst_offset;
  96         tree->sreg1 = state->left->reg1;
  97         mono_bblock_add_inst (s->cbb, tree);
  98 }
  99
 100 stmt: CEE_STIND_I1 (base, OP_CEQ (cflags)) {
 101         tree->opcode = OP_X86_SETEQ_MEMBASE;
 102         tree->inst_offset = state->left->tree->inst_offset;
 103         tree->inst_basereg = state->left->tree->inst_basereg;
 104         mono_bblock_add_inst (s->cbb, tree);
 105 }
 106
 107 reg: OP_LOCALLOC (OP_ICONST) {
 108         if (tree->flags & MONO_INST_INIT) {
 109                 /* microcoded in mini-x86.c */
 110                 tree->sreg1 = mono_regstate_next_int (s->rs);
 111                 MONO_EMIT_NEW_ICONST (s, tree->sreg1, state->left->tree->inst_c0);
 112                 mono_bblock_add_inst (s->cbb, tree);
 113         } else {
 114                 MONO_EMIT_NEW_BIALU_IMM (s, OP_SUB_IMM, X86_ESP, X86_ESP, state->left->tree->inst_c0);
 115                 MONO_EMIT_UNALU (s, tree, OP_MOVE, state->reg1, X86_ESP);
 116         }
 117 }
 118
 119 reg: OP_LOCALLOC (reg) {
 120         mono_bblock_add_inst (s->cbb, tree);
 121 }
 122
 123 stmt: OP_SETRET (reg) {
 124         tree->opcode = OP_MOVE;
 125         tree->sreg1 = state->left->reg1;
 126         tree->dreg = X86_EAX;
 127         mono_bblock_add_inst (s->cbb, tree);
 128 }
 129
 130 stmt: OP_SETRET (lreg) {
 131         MONO_EMIT_NEW_UNALU (s, OP_MOVE, X86_EDX, state->left->reg2);
 132         tree->opcode = OP_MOVE;
 133         tree->sreg1 = state->left->reg1;
 134         tree->dreg = X86_EAX;
 135         mono_bblock_add_inst (s->cbb, tree);
 136 }
 137
 138 stmt: OP_SETRET (CEE_LDIND_REF (OP_REGVAR)) {
 139         tree->opcode = OP_MOVE;
 140         tree->sreg1 = state->left->left->tree->dreg;
 141         tree->dreg = X86_EAX;
 142         mono_bblock_add_inst (s->cbb, tree);
 143 }
 144
 145 stmt: OP_SETRET (freg) {
 146         /* nothing to do */
 147 }
 148
 149 stmt: OP_SETRET (OP_ICONST) {
 150         tree->opcode = OP_ICONST;
 151         tree->inst_c0 = state->left->tree->inst_c0;
 152         tree->dreg = X86_EAX;
 153         mono_bblock_add_inst (s->cbb, tree);
 154 }
 155
 156 stmt: OP_OUTARG (reg) {
 157         tree->opcode = OP_X86_PUSH;
 158         tree->sreg1 = state->left->reg1;
 159         mono_bblock_add_inst (s->cbb, tree);
 160 }
 161
 162 # we need to reduce this code duplication with some burg syntax extension
 163 stmt: OP_OUTARG (CEE_LDIND_REF (OP_REGVAR)) {
 164         tree->opcode = OP_X86_PUSH;
 165         tree->sreg1 = state->left->left->tree->dreg;
 166         mono_bblock_add_inst (s->cbb, tree);
 167 }
 168
 169 stmt: OP_OUTARG (CEE_LDIND_I4 (OP_REGVAR)) {
 170         tree->opcode = OP_X86_PUSH;
 171         tree->sreg1 = state->left->left->tree->dreg;
 172         mono_bblock_add_inst (s->cbb, tree);
 173 }
 174
 175 stmt: OP_OUTARG (CEE_LDIND_U4 (OP_REGVAR)) {
 176         tree->opcode = OP_X86_PUSH;
 177         tree->sreg1 = state->left->left->tree->dreg;
 178         mono_bblock_add_inst (s->cbb, tree);
 179 }
 180
 181 stmt: OP_OUTARG (CEE_LDIND_I (OP_REGVAR)) {
 182         tree->opcode = OP_X86_PUSH;
 183         tree->sreg1 = state->left->left->tree->dreg;
 184         mono_bblock_add_inst (s->cbb, tree);
 185 }
 186
 187 stmt: OP_OUTARG (lreg) {
 188         MONO_EMIT_NEW_UNALU (s, OP_X86_PUSH, -1, state->left->reg2);
 189         tree->opcode = OP_X86_PUSH;
 190         tree->sreg1 = state->left->reg1;
 191         mono_bblock_add_inst (s->cbb, tree);
 192 }
 193
 194 stmt: OP_OUTARG (CEE_LDIND_I8 (base)) {
 195         MonoInst *ins;
 196         ins = mono_mempool_alloc0 (s->mempool, sizeof (MonoInst));
 197         ins->opcode = OP_X86_PUSH_MEMBASE;
 198         ins->inst_basereg = state->left->left->tree->inst_basereg;
 199         ins->inst_offset = state->left->left->tree->inst_offset + 4;
 200         mono_bblock_add_inst (s->cbb, ins);
 201
 202         tree->opcode = OP_X86_PUSH_MEMBASE;
 203         tree->inst_basereg = state->left->left->tree->inst_basereg;
 204         tree->inst_offset = state->left->left->tree->inst_offset;
 205         mono_bblock_add_inst (s->cbb, tree);
 206 }
 207
 208 stmt: OP_OUTARG (OP_ICONST) {
 209         tree->opcode = OP_X86_PUSH_IMM;
 210         tree->inst_imm = state->left->tree->inst_c0;
 211         mono_bblock_add_inst (s->cbb, tree);
 212 }
 213
 214 stmt: OP_OUTARG (CEE_LDIND_I4 (base)) {
 215         tree->opcode = OP_X86_PUSH_MEMBASE;
 216         tree->inst_basereg = state->left->left->tree->inst_basereg;
 217         tree->inst_offset = state->left->left->tree->inst_offset;
 218         mono_bblock_add_inst (s->cbb, tree);
 219 }
 220
 221 stmt: OP_OUTARG (CEE_LDIND_U4 (base)) {
 222         tree->opcode = OP_X86_PUSH_MEMBASE;
 223         tree->inst_basereg = state->left->left->tree->inst_basereg;
 224         tree->inst_offset = state->left->left->tree->inst_offset;
 225         mono_bblock_add_inst (s->cbb, tree);
 226 }
 227
 228 stmt: OP_OUTARG (CEE_LDIND_I (base)) {
 229         tree->opcode = OP_X86_PUSH_MEMBASE;
 230         tree->inst_basereg = state->left->left->tree->inst_basereg;
 231         tree->inst_offset = state->left->left->tree->inst_offset;
 232         mono_bblock_add_inst (s->cbb, tree);
 233 }
 234
 235 stmt: OP_OUTARG (CEE_LDIND_REF (base)) {
 236         tree->opcode = OP_X86_PUSH_MEMBASE;
 237         tree->inst_basereg = state->left->left->tree->inst_basereg;
 238         tree->inst_offset = state->left->left->tree->inst_offset;
 239         mono_bblock_add_inst (s->cbb, tree);
 240 }
 241
 242 stmt: OP_OUTARG (CEE_LDIND_REF (OP_REGVAR)) {
 243         tree->opcode = OP_X86_PUSH;
 244         tree->sreg1 = state->left->left->tree->dreg;
 245         mono_bblock_add_inst (s->cbb, tree);
 246 }
 247
 248 stmt: OP_OUTARG (CEE_LDOBJ (reg)) {
 249         tree->opcode = OP_X86_PUSH;
 250         tree->sreg1 = state->left->reg1;
 251         mono_bblock_add_inst (s->cbb, tree);
 252 }
 253
 254 stmt: OP_OUTARG (freg) {
 255         MONO_EMIT_NEW_BIALU_IMM (s, OP_SUB_IMM, X86_ESP, X86_ESP, 8);
 256         tree->opcode = OP_STORER8_MEMBASE_REG;
 257         tree->sreg1 = state->left->reg1;
 258         tree->inst_destbasereg = X86_ESP;
 259         tree->inst_offset = 0;
 260         mono_bblock_add_inst (s->cbb, tree);
 261 }
 262
 263 stmt: OP_OUTARG_R4 (freg) {
 264         MONO_EMIT_NEW_BIALU_IMM (s, OP_SUB_IMM, X86_ESP, X86_ESP, 4);
 265         tree->opcode = OP_STORER4_MEMBASE_REG;
 266         tree->sreg1 = state->left->reg1;
 267         tree->inst_destbasereg = X86_ESP;
 268         tree->inst_offset = 0;
 269         mono_bblock_add_inst (s->cbb, tree);
 270 }
 271
 272 stmt: OP_OUTARG_R8 (freg) {
 273         MONO_EMIT_NEW_BIALU_IMM (s, OP_SUB_IMM, X86_ESP, X86_ESP, 8);
 274         tree->opcode = OP_STORER8_MEMBASE_REG;
 275         tree->sreg1 = state->left->reg1;
 276         tree->inst_destbasereg = X86_ESP;
 277         tree->inst_offset = 0;
 278         mono_bblock_add_inst (s->cbb, tree);
 279 }
 280
 281 stmt: OP_OUTARG_VT (CEE_LDOBJ (base)) {
 282         MonoInst *vt = state->left->left->tree;
 283         //g_print ("vt size: %d at R%d + %d\n", tree->inst_imm, vt->inst_basereg, vt->inst_offset);
 284
 285         if (!tree->inst_imm)
 286                 return;
 287
 288         if (tree->inst_imm <= 4) {
 289                 tree->opcode = OP_X86_PUSH_MEMBASE;
 290                 tree->inst_basereg = vt->inst_basereg;
 291                 tree->inst_offset = vt->inst_offset;
 292                 mono_bblock_add_inst (s->cbb, tree);
 293         } else {
 294                 tree->opcode = OP_X86_PUSH_OBJ;
 295                 tree->inst_basereg = vt->inst_basereg;
 296                 tree->inst_offset = vt->inst_offset;
 297                 mono_bblock_add_inst (s->cbb, tree);
 298         }
 299 }
 300
 301 stmt: OP_OUTARG_VT (OP_ICONST) {
 302         tree->opcode = OP_X86_PUSH_IMM;
 303         tree->inst_imm = state->left->tree->inst_c0;
 304         mono_bblock_add_inst (s->cbb, tree);
 305 }
 306
 307 reg: CEE_LDELEMA (reg, reg) "15" {
 308         int length_reg = mono_regstate_next_int (s->rs);
 309         guint32 size = mono_class_array_element_size (tree->klass);
 310
 311         MONO_EMIT_NEW_LOAD_MEMBASE_OP (s, OP_LOADI4_MEMBASE, length_reg,
 312                                        state->left->reg1, G_STRUCT_OFFSET (MonoArray, max_length));
 313         MONO_EMIT_NEW_BIALU (s, OP_COMPARE, -1, length_reg, state->right->reg1);
 314         MONO_EMIT_NEW_COND_EXC (s, LE_UN, "IndexOutOfRangeException");
 315
 316         if (size == 1 || size == 2 || size == 4 || size == 8) {
 317                 static const int fast_log2 [] = { 1, 0, 1, -1, 2, -1, -1, -1, 3 };
 318                 tree->opcode = OP_X86_LEA;
 319                 tree->dreg = state->reg1;
 320                 tree->sreg1 = state->left->reg1;
 321                 tree->sreg2 = state->right->reg1;
 322                 tree->inst_imm = G_STRUCT_OFFSET (MonoArray, vector);
 323                 tree->unused = fast_log2 [size];
 324                 mono_bblock_add_inst (s->cbb, tree);
 325         } else {
 326                 int mult_reg = mono_regstate_next_int (s->rs);
 327                 int add_reg = mono_regstate_next_int (s->rs);
 328                 MONO_EMIT_NEW_BIALU_IMM (s, OP_MUL_IMM, mult_reg, state->right->reg1, size);
 329                 MONO_EMIT_NEW_BIALU (s, CEE_ADD, add_reg, mult_reg, state->left->reg1);
 330                 MONO_EMIT_NEW_BIALU_IMM (s, OP_ADD_IMM, state->reg1, add_reg, G_STRUCT_OFFSET (MonoArray, vector));
 331         }
 332 }
 333
 334 stmt: CEE_STIND_R8 (OP_REGVAR, freg) {
 335         /* nothing to do: the value is already on the FP stack */
 336 }
 337
 338 stmt: CEE_STIND_I4 (base, CEE_ADD (CEE_LDIND_I4 (base), OP_ICONST)) {
 339         int con = state->right->right->tree->inst_c0;
 340
 341         if (con == 1) {
 342                 tree->opcode = OP_X86_INC_MEMBASE;
 343         } else {
 344                 tree->opcode = OP_X86_ADD_MEMBASE_IMM;
 345                 tree->inst_imm = con;
 346         }
 347
 348         tree->inst_basereg = state->left->tree->inst_basereg;
 349         tree->inst_offset = state->left->tree->inst_offset;
 350         mono_bblock_add_inst (s->cbb, tree);
 351 } cost {
 352         MBTREE_TYPE *t1 = state->right->left->left->tree;
 353         MBTREE_TYPE *t2 = state->left->tree;
 354         MBCOND (t1->inst_basereg == t2->inst_basereg &&
 355                 t1->inst_offset == t2->inst_offset);
 356         return 2;
 357 }
 358
 359 stmt: CEE_STIND_I4 (base, CEE_SUB (CEE_LDIND_I4 (base), OP_ICONST)) {
 360         int con = state->right->right->tree->inst_c0;
 361
 362         if (con == 1) {
 363                 tree->opcode = OP_X86_DEC_MEMBASE;
 364         } else {
 365                 tree->opcode = OP_X86_SUB_MEMBASE_IMM;
 366                 tree->inst_imm = con;
 367         }
 368
 369         tree->inst_basereg = state->left->tree->inst_basereg;
 370         tree->inst_offset = state->left->tree->inst_offset;
 371         mono_bblock_add_inst (s->cbb, tree);
 372 } cost {
 373         MBTREE_TYPE *t1 = state->right->left->left->tree;
 374         MBTREE_TYPE *t2 = state->left->tree;
 375         MBCOND (t1->inst_basereg == t2->inst_basereg &&
 376                 t1->inst_offset == t2->inst_offset);
 377         return 2;
 378 }
 379
 380 #
 381 # this rules is incorrect, it needs to do an indirect inc (inc_membase)
 382 #stmt: CEE_STIND_I4 (reg, CEE_ADD (reg, OP_ICONST)) {
 383 #       tree->opcode = OP_X86_INC_REG;
 384 #       tree->dreg = state->left->reg1;
 385 #       mono_bblock_add_inst (s->cbb, tree);
 386 #} cost {
 387 #       MBState *s1 = state->left;
 388 #       MBState *s2 = state->right->left;
 389 #       int con = state->right->right->tree->inst_c0;
 390 #       MBCOND (con == 1 && s1->reg1 == s2->reg1);
 391 #       return 1;
 392 #}
 393
 394 stmt: CEE_STIND_I4 (OP_REGVAR, CEE_SUB (CEE_LDIND_I4 (OP_REGVAR), OP_ICONST)) {
 395         int con = state->right->right->tree->inst_c0;
 396         int dreg = state->left->tree->dreg;
 397         int sreg = state->right->left->left->tree->dreg;
 398
 399         if (con == 1) {
 400                 if (dreg != sreg)
 401                         MONO_EMIT_NEW_UNALU (s, OP_MOVE, dreg, sreg);
 402                 tree->opcode = OP_X86_DEC_REG;
 403                 tree->dreg = tree->sreg1 = dreg;
 404         } else if (con == -1) {
 405                 if (dreg != sreg)
 406                         MONO_EMIT_NEW_UNALU (s, OP_MOVE, dreg, sreg);
 407                 tree->opcode = OP_X86_INC_REG;
 408                 tree->dreg = tree->sreg1 = dreg;
 409         } else {
 410                 tree->opcode = OP_SUB_IMM;
 411                 tree->inst_imm = con;
 412                 tree->sreg1 = sreg;
 413                 tree->dreg = dreg;
 414         }
 415         mono_bblock_add_inst (s->cbb, tree);
 416 }
 417
 418 stmt: CEE_STIND_I4 (OP_REGVAR, CEE_ADD (CEE_LDIND_I4 (OP_REGVAR), OP_ICONST)) {
 419         int con = state->right->right->tree->inst_c0;
 420         int dreg = state->left->tree->dreg;
 421         int sreg = state->right->left->left->tree->dreg;
 422
 423         if (con == 1) {
 424                 if (dreg != sreg)
 425                         MONO_EMIT_NEW_UNALU (s, OP_MOVE, dreg, sreg);
 426                 tree->opcode = OP_X86_INC_REG;
 427                 tree->dreg = tree->sreg1 = dreg;
 428         } else if (con == -1) {
 429                 if (dreg != sreg)
 430                         MONO_EMIT_NEW_UNALU (s, OP_MOVE, dreg, sreg);
 431                 tree->opcode = OP_X86_DEC_REG;
 432                 tree->dreg = tree->sreg1 = dreg;
 433         } else {
 434                 tree->opcode = OP_ADD_IMM;
 435                 tree->inst_imm = con;
 436                 tree->sreg1 = sreg;
 437                 tree->dreg = dreg;
 438         }
 439         mono_bblock_add_inst (s->cbb, tree);
 440 }
 441
 442 reg: CEE_LDIND_I2 (OP_REGVAR) {
 443         MONO_EMIT_UNALU (s, tree, OP_SEXT_I2, state->reg1, state->left->tree->dreg);
 444 }
 445
 446 # on x86, fp compare overwrites EAX, so we must
 447 # either improve the local register allocator or
 448 # emit coarse opcodes which saves EAX for us.
 449
 450 reg: OP_CEQ (OP_COMPARE (freg, freg)) {
 451         MONO_EMIT_BIALU (s, tree, OP_FCEQ, state->reg1, state->left->left->reg1,
 452                          state->left->right->reg1);
 453 }
 454
 455 reg: OP_CLT (OP_COMPARE (freg, freg)) {
 456         MONO_EMIT_BIALU (s, tree, OP_FCLT, state->reg1, state->left->left->reg1,
 457                          state->left->right->reg1);
 458 }
 459
 460 reg: OP_CLT_UN (OP_COMPARE (freg, freg)) {
 461         MONO_EMIT_BIALU (s, tree, OP_FCLT_UN, state->reg1, state->left->left->reg1,
 462                          state->left->right->reg1);
 463 }
 464
 465 reg: OP_CGT (OP_COMPARE (freg, freg)) {
 466         MONO_EMIT_BIALU (s, tree, OP_FCGT, state->reg1, state->left->left->reg1,
 467                          state->left->right->reg1);
 468 }
 469
 470 reg: OP_CGT_UN (OP_COMPARE (freg, freg)) {
 471         MONO_EMIT_BIALU (s, tree, OP_FCGT_UN, state->reg1, state->left->left->reg1,
 472                          state->left->right->reg1);
 473 }
 474
 475 # fpcflags overwrites EAX, but this does not matter for statements
 476 # because we are the last operation in the tree.
 477
 478 stmt: CEE_BNE_UN (fpcflags) {
 479         tree->opcode = OP_FBNE_UN;
 480         mono_bblock_add_inst (s->cbb, tree);
 481 }
 482
 483 stmt: CEE_BEQ (fpcflags) {
 484         tree->opcode = OP_FBEQ;
 485         mono_bblock_add_inst (s->cbb, tree);
 486 }
 487
 488 stmt: CEE_BLT (fpcflags) {
 489         tree->opcode = OP_FBLT;
 490         mono_bblock_add_inst (s->cbb, tree);
 491 }
 492
 493 stmt: CEE_BLT_UN (fpcflags) {
 494         tree->opcode = OP_FBLT_UN;
 495         mono_bblock_add_inst (s->cbb, tree);
 496 }
 497
 498 stmt: CEE_BGT (fpcflags) {
 499         tree->opcode = OP_FBGT;
 500         mono_bblock_add_inst (s->cbb, tree);
 501 }
 502
 503 stmt: CEE_BGT_UN (fpcflags) {
 504         tree->opcode = OP_FBGT_UN;
 505         mono_bblock_add_inst (s->cbb, tree);
 506 }
 507
 508 stmt: CEE_BGE  (fpcflags) {
 509         tree->opcode = OP_FBGE;
 510         mono_bblock_add_inst (s->cbb, tree);
 511 }
 512
 513 stmt: CEE_BGE_UN (fpcflags) {
 514         tree->opcode = OP_FBGE_UN;
 515         mono_bblock_add_inst (s->cbb, tree);
 516 }
 517
 518 stmt: CEE_BLE  (fpcflags) {
 519         tree->opcode = OP_FBLE;
 520         mono_bblock_add_inst (s->cbb, tree);
 521 }
 522
 523 stmt: CEE_BLE_UN (fpcflags) {
 524         tree->opcode = OP_FBLE_UN;
 525         mono_bblock_add_inst (s->cbb, tree);
 526 }
 527
 528 stmt: CEE_POP (freg) "0" {
 529         /* we need to pop the value from the x86 FP stack */
 530         MONO_EMIT_UNALU (s, tree, OP_X86_FPOP, -1, state->left->reg1);
 531 }
 532
 533 %%