1 /* Definitions for code generation pass of GNU compiler. 2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 2, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING. If not, write to the Free 19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 20 02111-1307, USA. */ 21 22 /* The default branch cost is 1. */ 23 #ifndef BRANCH_COST 24 #define BRANCH_COST 1 25 #endif 26 27 /* Macros to access the slots of a QUEUED rtx. 28 Here rather than in rtl.h because only the expansion pass 29 should ever encounter a QUEUED. */ 30 31 /* The variable for which an increment is queued. */ 32 #define QUEUED_VAR(P) XEXP (P, 0) 33 /* If the increment has been emitted, this is the insn 34 that does the increment. It is zero before the increment is emitted. 35 If more than one insn is emitted, this is the first insn. */ 36 #define QUEUED_INSN(P) XEXP (P, 1) 37 /* If a pre-increment copy has been generated, this is the copy 38 (it is a temporary reg). Zero if no copy made yet. */ 39 #define QUEUED_COPY(P) XEXP (P, 2) 40 /* This is the body to use for the insn to do the increment. 41 It is used to emit the increment. */ 42 #define QUEUED_BODY(P) XEXP (P, 3) 43 /* Next QUEUED in the queue. */ 44 #define QUEUED_NEXT(P) XEXP (P, 4) 45 46 /* This is the 4th arg to `expand_expr'. 47 EXPAND_STACK_PARM means we are possibly expanding a call param onto 48 the stack. Choosing a value of 2 isn't special; It just allows 49 some code optimization in store_expr. 50 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. 51 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. 52 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address 53 is a constant that is not a legitimate address. 54 EXPAND_WRITE means we are only going to write to the resulting rtx. 55 EXPAND_MEMORY means we are interested in a memory result, even if 56 the memory is constant and we could have propagated a constant value. */ 57 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM, 58 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, 59 EXPAND_MEMORY}; 60 61 /* Prevent the compiler from deferring stack pops. See 62 inhibit_defer_pop for more information. */ 63 #define NO_DEFER_POP (inhibit_defer_pop += 1) 64 65 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for 66 more information. */ 67 #define OK_DEFER_POP (inhibit_defer_pop -= 1) 68 69 #ifdef TREE_CODE /* Don't lose if tree.h not included. */ 70 /* Structure to record the size of a sequence of arguments 71 as the sum of a tree-expression and a constant. This structure is 72 also used to store offsets from the stack, which might be negative, 73 so the variable part must be ssizetype, not sizetype. */ 74 75 struct args_size 76 { 77 HOST_WIDE_INT constant; 78 tree var; 79 }; 80 #endif 81 82 /* Add the value of the tree INC to the `struct args_size' TO. */ 83 84 #define ADD_PARM_SIZE(TO, INC) \ 85 do { \ 86 tree inc = (INC); \ 87 if (host_integerp (inc, 0)) \ 88 (TO).constant += tree_low_cst (inc, 0); \ 89 else if ((TO).var == 0) \ 90 (TO).var = convert (ssizetype, inc); \ 91 else \ 92 (TO).var = size_binop (PLUS_EXPR, (TO).var, \ 93 convert (ssizetype, inc)); \ 94 } while (0) 95 96 #define SUB_PARM_SIZE(TO, DEC) \ 97 do { \ 98 tree dec = (DEC); \ 99 if (host_integerp (dec, 0)) \ 100 (TO).constant -= tree_low_cst (dec, 0); \ 101 else if ((TO).var == 0) \ 102 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ 103 convert (ssizetype, dec)); \ 104 else \ 105 (TO).var = size_binop (MINUS_EXPR, (TO).var, \ 106 convert (ssizetype, dec)); \ 107 } while (0) 108 109 /* Convert the implicit sum in a `struct args_size' into a tree 110 of type ssizetype. */ 111 #define ARGS_SIZE_TREE(SIZE) \ 112 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ 113 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \ 114 ssize_int ((SIZE).constant))) 115 116 /* Convert the implicit sum in a `struct args_size' into an rtx. */ 117 #define ARGS_SIZE_RTX(SIZE) \ 118 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \ 119 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0)) 120 121 /* Supply a default definition for FUNCTION_ARG_PADDING: 122 usually pad upward, but pad short args downward on 123 big-endian machines. */ 124 125 enum direction {none, upward, downward}; /* Value has this type. */ 126 127 #ifndef FUNCTION_ARG_PADDING 128 #define FUNCTION_ARG_PADDING(MODE, TYPE) \ 129 (! BYTES_BIG_ENDIAN \ 130 ? upward \ 131 : (((MODE) == BLKmode \ 132 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \ 133 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \ 134 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \ 135 ? downward : upward)) 136 #endif 137 138 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let 139 FUNCTION_ARG_PADDING, which also pads the length, handle any needed 140 alignment. */ 141 142 #ifndef FUNCTION_ARG_BOUNDARY 143 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY 144 #endif 145 146 /* Provide a default value for STRICT_ARGUMENT_NAMING. */ 147 #ifndef STRICT_ARGUMENT_NAMING 148 #define STRICT_ARGUMENT_NAMING 0 149 #endif 150 151 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */ 152 #ifdef SETUP_INCOMING_VARARGS 153 #ifndef PRETEND_OUTGOING_VARARGS_NAMED 154 #define PRETEND_OUTGOING_VARARGS_NAMED 1 155 #endif 156 #else 157 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without 158 defining SETUP_INCOMING_VARARGS. */ 159 #define PRETEND_OUTGOING_VARARGS_NAMED 0 160 #endif 161 162 /* Nonzero if we do not know how to pass TYPE solely in registers. */ 163 extern bool default_must_pass_in_stack PARAMS((enum machine_mode, tree)); 164 #ifndef MUST_PASS_IN_STACK 165 #define MUST_PASS_IN_STACK(MODE,TYPE) default_must_pass_in_stack(MODE, TYPE) 166 #endif 167 168 /* Nonzero if type TYPE should be returned in memory. 169 Most machines can use the following default definition. */ 170 171 #ifndef RETURN_IN_MEMORY 172 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode) 173 #endif 174 175 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save. 176 Normally move_insn, so Pmode stack pointer. */ 177 178 #ifndef STACK_SAVEAREA_MODE 179 #define STACK_SAVEAREA_MODE(LEVEL) Pmode 180 #endif 181 182 /* Supply a default definition of STACK_SIZE_MODE for 183 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */ 184 185 #ifndef STACK_SIZE_MODE 186 #define STACK_SIZE_MODE word_mode 187 #endif 188 189 /* Provide default values for the macros controlling stack checking. */ 190 191 #ifndef STACK_CHECK_BUILTIN 192 #define STACK_CHECK_BUILTIN 0 193 #endif 194 195 /* The default interval is one page. */ 196 #ifndef STACK_CHECK_PROBE_INTERVAL 197 #define STACK_CHECK_PROBE_INTERVAL 4096 198 #endif 199 200 /* The default is to do a store into the stack. */ 201 #ifndef STACK_CHECK_PROBE_LOAD 202 #define STACK_CHECK_PROBE_LOAD 0 203 #endif 204 205 /* This value is arbitrary, but should be sufficient for most machines. */ 206 #ifndef STACK_CHECK_PROTECT 207 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD) 208 #endif 209 210 /* Make the maximum frame size be the largest we can and still only need 211 one probe per function. */ 212 #ifndef STACK_CHECK_MAX_FRAME_SIZE 213 #define STACK_CHECK_MAX_FRAME_SIZE \ 214 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD) 215 #endif 216 217 /* This is arbitrary, but should be large enough everywhere. */ 218 #ifndef STACK_CHECK_FIXED_FRAME_SIZE 219 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD) 220 #endif 221 222 /* Provide a reasonable default for the maximum size of an object to 223 allocate in the fixed frame. We may need to be able to make this 224 controllable by the user at some point. */ 225 #ifndef STACK_CHECK_MAX_VAR_SIZE 226 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100) 227 #endif 228 229 /* Functions from optabs.c, commonly used, and without need for the optabs 230 tables: */ 231 232 /* Passed to expand_simple_binop and expand_binop to say which options 233 to try to use if the requested operation can't be open-coded on the 234 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using 235 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try 236 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't 237 try anything else. */ 238 239 enum optab_methods 240 { 241 OPTAB_DIRECT, 242 OPTAB_LIB, 243 OPTAB_WIDEN, 244 OPTAB_LIB_WIDEN, 245 OPTAB_MUST_WIDEN 246 }; 247 248 /* Generate code for a simple binary or unary operation. "Simple" in 249 this case means "can be unambiguously described by a (mode, code) 250 pair and mapped to a single optab." */ 251 extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx, 252 rtx, rtx, int, enum optab_methods)); 253 extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code, 254 rtx, rtx, int)); 255 256 /* Report whether the machine description contains an insn which can 257 perform the operation described by CODE and MODE. */ 258 extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode)); 259 260 /* Emit code to make a call to a constant function or a library call. */ 261 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx)); 262 263 /* Create but don't emit one rtl instruction to perform certain operations. 264 Modes must match; operands must meet the operation's predicates. 265 Likewise for subtraction and for just copying. 266 These do not call protect_from_queue; caller must do so. */ 267 extern rtx gen_add2_insn PARAMS ((rtx, rtx)); 268 extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx)); 269 extern rtx gen_sub2_insn PARAMS ((rtx, rtx)); 270 extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx)); 271 extern rtx gen_move_insn PARAMS ((rtx, rtx)); 272 extern int have_add2_insn PARAMS ((rtx, rtx)); 273 extern int have_sub2_insn PARAMS ((rtx, rtx)); 274 275 /* Emit a pair of rtl insns to compare two rtx's and to jump 276 to a label if the comparison is true. */ 277 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx, 278 enum machine_mode, int, rtx)); 279 280 /* Generate code to indirectly jump to a location given in the rtx LOC. */ 281 extern void emit_indirect_jump PARAMS ((rtx)); 282 283 #ifdef HAVE_conditional_move 284 /* Emit a conditional move operation. */ 285 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx, 286 enum machine_mode, rtx, rtx, 287 enum machine_mode, int)); 288 289 /* Return nonzero if the conditional move is supported. */ 290 int can_conditionally_move_p PARAMS ((enum machine_mode mode)); 291 292 #endif 293 294 295 /* Functions from expmed.c: */ 296 297 /* Arguments MODE, RTX: return an rtx for the negation of that value. 298 May emit insns. */ 299 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx)); 300 301 /* Expand a logical AND operation. */ 302 extern rtx expand_and PARAMS ((enum machine_mode, rtx, rtx, rtx)); 303 304 /* Emit a store-flag operation. */ 305 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx, 306 enum machine_mode, int, int)); 307 308 /* Like emit_store_flag, but always succeeds. */ 309 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx, 310 enum machine_mode, int, int)); 311 312 /* Functions from loop.c: */ 313 314 /* Given an insn and condition, return a canonical description of 315 the test being made. */ 316 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx)); 317 318 /* Given a JUMP_INSN, return a canonical description of the test 319 being made. */ 320 extern rtx get_condition PARAMS ((rtx, rtx *)); 321 322 /* Generate a conditional trap instruction. */ 323 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx)); 324 325 /* Functions from builtins.c: */ 326 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int)); 327 extern void std_expand_builtin_va_start PARAMS ((tree, rtx)); 328 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree)); 329 extern rtx expand_builtin_va_arg PARAMS ((tree, tree)); 330 extern void default_init_builtins PARAMS ((void)); 331 extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx, 332 enum machine_mode, int)); 333 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx)); 334 extern void expand_builtin_setjmp_receiver PARAMS ((rtx)); 335 extern void expand_builtin_longjmp PARAMS ((rtx, rtx)); 336 extern rtx expand_builtin_saveregs PARAMS ((void)); 337 extern void expand_builtin_trap PARAMS ((void)); 338 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void)); 339 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void)); 340 extern void record_base_value PARAMS ((unsigned int, rtx, int)); 341 extern void record_alias_subset PARAMS ((HOST_WIDE_INT, 342 HOST_WIDE_INT)); 343 extern HOST_WIDE_INT new_alias_set PARAMS ((void)); 344 extern int can_address_p PARAMS ((tree)); 345 346 /* Functions from expr.c: */ 347 348 /* This is run once per compilation to set up which modes can be used 349 directly in memory and to initialize the block move optab. */ 350 extern void init_expr_once PARAMS ((void)); 351 352 /* This is run at the start of compiling a function. */ 353 extern void init_expr PARAMS ((void)); 354 355 /* This is run at the end of compiling a function. */ 356 extern void finish_expr_for_function PARAMS ((void)); 357 358 /* Use protect_from_queue to convert a QUEUED expression 359 into something that you can put immediately into an instruction. */ 360 extern rtx protect_from_queue PARAMS ((rtx, int)); 361 362 /* Perform all the pending incrementations. */ 363 extern void emit_queue PARAMS ((void)); 364 365 /* Tell if something has a queued subexpression. */ 366 extern int queued_subexp_p PARAMS ((rtx)); 367 368 /* Emit some rtl insns to move data between rtx's, converting machine modes. 369 Both modes must be floating or both fixed. */ 370 extern void convert_move PARAMS ((rtx, rtx, int)); 371 372 /* Convert an rtx to specified machine mode and return the result. */ 373 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int)); 374 375 /* Convert an rtx to MODE from OLDMODE and return the result. */ 376 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode, 377 rtx, int)); 378 379 /* Emit code to move a block Y to a block X. */ 380 381 enum block_op_methods 382 { 383 BLOCK_OP_NORMAL, 384 BLOCK_OP_NO_LIBCALL, 385 BLOCK_OP_CALL_PARM 386 }; 387 388 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, enum block_op_methods)); 389 390 /* Copy all or part of a value X into registers starting at REGNO. 391 The number of registers to be filled is NREGS. */ 392 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode)); 393 394 /* Copy all or part of a BLKmode value X out of registers starting at REGNO. 395 The number of registers to be filled is NREGS. */ 396 extern void move_block_from_reg PARAMS ((int, rtx, int, int)); 397 398 /* Generate a non-consecutive group of registers represented by a PARALLEL. */ 399 extern rtx gen_group_rtx PARAMS ((rtx)); 400 401 /* Load a BLKmode value into non-consecutive registers represented by a 402 PARALLEL. */ 403 extern void emit_group_load PARAMS ((rtx, rtx, int)); 404 405 /* Move a non-consecutive group of registers represented by a PARALLEL into 406 a non-consecutive group of registers represented by a PARALLEL. */ 407 extern void emit_group_move PARAMS ((rtx, rtx)); 408 409 /* Store a BLKmode value from non-consecutive registers represented by a 410 PARALLEL. */ 411 extern void emit_group_store PARAMS ((rtx, rtx, int)); 412 413 #ifdef TREE_CODE 414 /* Copy BLKmode object from a set of registers. */ 415 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree)); 416 #endif 417 418 /* Mark REG as holding a parameter for the next CALL_INSN. */ 419 extern void use_reg PARAMS ((rtx *, rtx)); 420 421 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters 422 for the next CALL_INSN. */ 423 extern void use_regs PARAMS ((rtx *, int, int)); 424 425 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ 426 extern void use_group_regs PARAMS ((rtx *, rtx)); 427 428 /* Write zeros through the storage of OBJECT. 429 If OBJECT has BLKmode, SIZE is its length in bytes. */ 430 extern rtx clear_storage PARAMS ((rtx, rtx)); 431 432 /* Return nonzero if it is desirable to store LEN bytes generated by 433 CONSTFUN with several move instructions by store_by_pieces 434 function. CONSTFUNDATA is a pointer which will be passed as argument 435 in every CONSTFUN call. 436 ALIGN is maximum alignment we can assume. */ 437 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT, 438 rtx (*) (PTR, HOST_WIDE_INT, 439 enum machine_mode), 440 PTR, unsigned int)); 441 442 /* Generate several move instructions to store LEN bytes generated by 443 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a 444 pointer which will be passed as argument in every CONSTFUN call. 445 ALIGN is maximum alignment we can assume. */ 446 extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT, 447 rtx (*) (PTR, HOST_WIDE_INT, 448 enum machine_mode), 449 PTR, unsigned int)); 450 451 /* Emit insns to set X from Y. */ 452 extern rtx emit_move_insn PARAMS ((rtx, rtx)); 453 454 /* Emit insns to set X from Y, with no frills. */ 455 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx)); 456 457 /* Push a block of length SIZE (perhaps variable) 458 and return an rtx to address the beginning of the block. */ 459 extern rtx push_block PARAMS ((rtx, int, int)); 460 461 #ifdef TREE_CODE 462 /* Generate code to push something onto the stack, given its mode and type. */ 463 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx, 464 unsigned int, int, rtx, int, rtx, rtx, 465 int, rtx)); 466 467 /* Expand an assignment that stores the value of FROM into TO. */ 468 extern rtx expand_assignment PARAMS ((tree, tree, int, int)); 469 470 /* Generate code for computing expression EXP, 471 and storing the value into TARGET. 472 If SUGGEST_REG is nonzero, copy the value through a register 473 and return that register, if that is possible. */ 474 extern rtx store_expr PARAMS ((tree, rtx, int)); 475 #endif 476 477 /* Given an rtx that may include add and multiply operations, 478 generate them as insns and return a pseudo-reg containing the value. 479 Useful after calling expand_expr with 1 as sum_ok. */ 480 extern rtx force_operand PARAMS ((rtx, rtx)); 481 482 /* Return an object on the placeholder list that matches EXP, a 483 PLACEHOLDER_EXPR. An object "matches" if it is of the type of the 484 PLACEHOLDER_EXPR or a pointer type to it. For further information, see 485 tree.def. If no such object is found, abort. If PLIST is nonzero, it is 486 a location which initially points to a starting location in the 487 placeholder list (zero means start of the list) and where a pointer into 488 the placeholder list at which the object is found is placed. */ 489 extern tree find_placeholder PARAMS ((tree, tree *)); 490 491 /* Generate code for computing expression EXP. 492 An rtx for the computed value is returned. The value is never null. 493 In the case of a void EXP, const0_rtx is returned. */ 494 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode, 495 enum expand_modifier)); 496 497 /* At the start of a function, record that we have no previously-pushed 498 arguments waiting to be popped. */ 499 extern void init_pending_stack_adjust PARAMS ((void)); 500 501 /* When exiting from function, if safe, clear out any pending stack adjust 502 so the adjustment won't get done. */ 503 extern void clear_pending_stack_adjust PARAMS ((void)); 504 505 /* Pop any previously-pushed arguments that have not been popped yet. */ 506 extern void do_pending_stack_adjust PARAMS ((void)); 507 508 #ifdef TREE_CODE 509 /* Return the tree node and offset if a given argument corresponds to 510 a string constant. */ 511 extern tree string_constant PARAMS ((tree, tree *)); 512 513 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */ 514 extern void jumpifnot PARAMS ((tree, rtx)); 515 516 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ 517 extern void jumpif PARAMS ((tree, rtx)); 518 519 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if 520 the result is zero, or IF_TRUE_LABEL if the result is one. */ 521 extern void do_jump PARAMS ((tree, rtx, rtx)); 522 #endif 523 524 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */ 525 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int, 526 enum machine_mode, rtx)); 527 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int, 528 enum machine_mode, rtx, 529 rtx, rtx)); 530 531 /* Two different ways of generating switch statements. */ 532 extern int try_casesi PARAMS ((tree, tree, tree, tree, rtx, rtx)); 533 extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx)); 534 535 /* Smallest number of adjacent cases before we use a jump table. 536 XXX Should be a target hook. */ 537 extern unsigned int case_values_threshold PARAMS ((void)); 538 539 540 #ifdef TREE_CODE 541 /* rtl.h and tree.h were included. */ 542 /* Return an rtx for the size in bytes of the value of an expr. */ 543 extern rtx expr_size PARAMS ((tree)); 544 545 /* Return a wide integer for the size in bytes of the value of EXP, or -1 546 if the size can vary or is larger than an integer. */ 547 extern HOST_WIDE_INT int_expr_size PARAMS ((tree)); 548 549 extern rtx lookup_static_chain PARAMS ((tree)); 550 551 /* Convert a stack slot address ADDR valid in function FNDECL 552 into an address valid in this function (using a static chain). */ 553 extern rtx fix_lexical_addr PARAMS ((rtx, tree)); 554 555 /* Return the address of the trampoline for entering nested fn FUNCTION. */ 556 extern rtx trampoline_address PARAMS ((tree)); 557 558 /* Return an rtx that refers to the value returned by a function 559 in its original home. This becomes invalid if any more code is emitted. */ 560 extern rtx hard_function_value PARAMS ((tree, tree, int)); 561 562 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int)); 563 564 extern rtx expand_call PARAMS ((tree, rtx, int)); 565 566 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree, 567 rtx, int)); 568 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx, 569 rtx, rtx, int)); 570 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree, 571 struct args_size *, 572 struct args_size *, 573 struct args_size *, 574 struct args_size *)); 575 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx)); 576 577 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */ 578 extern rtx label_rtx PARAMS ((tree)); 579 #endif 580 581 /* Indicate how an input argument register was promoted. */ 582 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *, 583 int *)); 584 585 /* Return an rtx like arg but sans any constant terms. 586 Returns the original rtx if it has no constant terms. 587 The constant terms are added and stored via a second arg. */ 588 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *)); 589 590 /* Convert arg to a valid memory address for specified machine mode, 591 by emitting insns to perform arithmetic if nec. */ 592 extern rtx memory_address PARAMS ((enum machine_mode, rtx)); 593 594 /* Like `memory_address' but pretent `flag_force_addr' is 0. */ 595 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx)); 596 597 /* Set the alias set of MEM to SET. */ 598 extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT)); 599 600 /* Set the alignment of MEM to ALIGN bits. */ 601 extern void set_mem_align PARAMS ((rtx, unsigned int)); 602 603 /* Set the expr for MEM to EXPR. */ 604 extern void set_mem_expr PARAMS ((rtx, tree)); 605 606 /* Set the offset for MEM to OFFSET. */ 607 extern void set_mem_offset PARAMS ((rtx, rtx)); 608 609 /* Set the size for MEM to SIZE. */ 610 extern void set_mem_size PARAMS ((rtx, rtx)); 611 612 /* Return a memory reference like MEMREF, but with its mode changed 613 to MODE and its address changed to ADDR. 614 (VOIDmode means don't change the mode. 615 NULL for ADDR means don't change the address.) */ 616 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx)); 617 618 /* Return a memory reference like MEMREF, but with its mode changed 619 to MODE and its address offset by OFFSET bytes. */ 620 #define adjust_address(MEMREF, MODE, OFFSET) \ 621 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1) 622 623 /* Likewise, but the reference is not required to be valid. */ 624 #define adjust_address_nv(MEMREF, MODE, OFFSET) \ 625 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1) 626 627 /* Return a memory reference like MEMREF, but with its mode changed 628 to MODE and its address changed to ADDR, which is assumed to be 629 increased by OFFSET bytes from MEMREF. */ 630 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \ 631 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1) 632 633 /* Likewise, but the reference is not required to be valid. */ 634 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \ 635 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0) 636 637 extern rtx adjust_address_1 PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT, 638 int, int)); 639 extern rtx adjust_automodify_address_1 PARAMS ((rtx, enum machine_mode, 640 rtx, HOST_WIDE_INT, int)); 641 642 /* Return a memory reference like MEMREF, but whose address is changed by 643 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor 644 known to be in OFFSET (possibly 1). */ 645 extern rtx offset_address PARAMS ((rtx, rtx, HOST_WIDE_INT)); 646 647 /* Return a memory reference like MEMREF, but with its address changed to 648 ADDR. The caller is asserting that the actual piece of memory pointed 649 to is the same, just the form of the address is being changed, such as 650 by putting something into a register. */ 651 extern rtx replace_equiv_address PARAMS ((rtx, rtx)); 652 653 /* Likewise, but the reference is not required to be valid. */ 654 extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx)); 655 656 /* Return a memory reference like MEMREF, but with its mode widened to 657 MODE and adjusted by OFFSET. */ 658 extern rtx widen_memory_access PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT)); 659 660 /* Return a memory reference like MEMREF, but which is known to have a 661 valid address. */ 662 extern rtx validize_mem PARAMS ((rtx)); 663 664 #ifdef TREE_CODE 665 /* Given REF, either a MEM or a REG, and T, either the type of X or 666 the expression corresponding to REF, set RTX_UNCHANGING_P if 667 appropriate. */ 668 extern void maybe_set_unchanging PARAMS ((rtx, tree)); 669 670 /* Given REF, a MEM, and T, either the type of X or the expression 671 corresponding to REF, set the memory attributes. OBJECTP is nonzero 672 if we are making a new object of this type. */ 673 extern void set_mem_attributes PARAMS ((rtx, tree, int)); 674 675 /* Similar, except that BITPOS has not yet been applied to REF, so if 676 we alter MEM_OFFSET according to T then we should subtract BITPOS 677 expecting that it'll be added back in later. */ 678 extern void set_mem_attributes_minus_bitpos PARAMS ((rtx, tree, int, 679 HOST_WIDE_INT)); 680 #endif 681 682 /* Assemble the static constant template for function entry trampolines. */ 683 extern rtx assemble_trampoline_template PARAMS ((void)); 684 685 /* Given rtx, return new rtx whose address won't be affected by 686 any side effects. It has been copied to a new temporary reg. */ 687 extern rtx stabilize PARAMS ((rtx)); 688 689 /* Given an rtx, copy all regs it refers to into new temps 690 and return a modified copy that refers to the new temps. */ 691 extern rtx copy_all_regs PARAMS ((rtx)); 692 693 /* Copy given rtx to a new temp reg and return that. */ 694 extern rtx copy_to_reg PARAMS ((rtx)); 695 696 /* Like copy_to_reg but always make the reg Pmode. */ 697 extern rtx copy_addr_to_reg PARAMS ((rtx)); 698 699 /* Like copy_to_reg but always make the reg the specified mode MODE. */ 700 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx)); 701 702 /* Copy given rtx to given temp reg and return that. */ 703 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode)); 704 705 /* Copy a value to a register if it isn't already a register. 706 Args are mode (in case value is a constant) and the value. */ 707 extern rtx force_reg PARAMS ((enum machine_mode, rtx)); 708 709 /* Return given rtx, copied into a new temp reg if it was in memory. */ 710 extern rtx force_not_mem PARAMS ((rtx)); 711 712 #ifdef TREE_CODE 713 /* Return mode and signedness to use when object is promoted. */ 714 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode, 715 int *, int)); 716 #endif 717 718 /* Remove some bytes from the stack. An rtx says how many. */ 719 extern void adjust_stack PARAMS ((rtx)); 720 721 /* Add some bytes to the stack. An rtx says how many. */ 722 extern void anti_adjust_stack PARAMS ((rtx)); 723 724 /* This enum is used for the following two functions. */ 725 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 726 727 /* Save the stack pointer at the specified level. */ 728 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx)); 729 730 /* Restore the stack pointer from a save area of the specified level. */ 731 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx)); 732 733 /* Allocate some space on the stack dynamically and return its address. An rtx 734 says how many bytes. */ 735 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int)); 736 737 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 738 FIRST is a constant and size is a Pmode RTX. These are offsets from the 739 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or 740 subtract from the stack. If SIZE is constant, this is done 741 with a fixed number of probes. Otherwise, we must make a loop. */ 742 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx)); 743 744 /* Return an rtx that refers to the value returned by a library call 745 in its original home. This becomes invalid if any more code is emitted. */ 746 extern rtx hard_libcall_value PARAMS ((enum machine_mode)); 747 748 /* Given an rtx, return an rtx for a value rounded up to a multiple 749 of STACK_BOUNDARY / BITS_PER_UNIT. */ 750 extern rtx round_push PARAMS ((rtx)); 751 752 /* Return the mode desired by operand N of a particular bitfield 753 insert/extract insn, or MAX_MACHINE_MODE if no such insn is 754 available. */ 755 756 enum extraction_pattern { EP_insv, EP_extv, EP_extzv }; 757 extern enum machine_mode 758 mode_for_extraction PARAMS ((enum extraction_pattern, int)); 759 760 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT, 761 unsigned HOST_WIDE_INT, 762 enum machine_mode, rtx, HOST_WIDE_INT)); 763 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT, 764 unsigned HOST_WIDE_INT, int, rtx, 765 enum machine_mode, enum machine_mode, 766 HOST_WIDE_INT)); 767 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int)); 768 extern bool const_mult_add_overflow_p PARAMS ((rtx, rtx, rtx, enum machine_mode, int)); 769 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int)); 770 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int)); 771 772 extern rtx assemble_static_space PARAMS ((int)); 773 774 /* Hook called by expand_expr for language-specific tree codes. 775 It is up to the language front end to install a hook 776 if it has any such codes that expand_expr needs to know about. */ 777 extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx, 778 enum machine_mode, 779 enum expand_modifier modifier)); 780 781 extern int safe_from_p PARAMS ((rtx, tree, int)); 782 783 /* Call this once to initialize the contents of the optabs 784 appropriately for the current target machine. */ 785 extern void init_optabs PARAMS ((void)); 786 extern void init_all_optabs PARAMS ((void)); 787 788 /* Call this to initialize an optab function entry. */ 789 extern rtx init_one_libfunc PARAMS ((const char *)); 790 791 extern void do_jump_by_parts_equality_rtx PARAMS ((rtx, rtx, rtx)); 792 extern void do_jump_by_parts_greater_rtx PARAMS ((enum machine_mode, 793 int, rtx, rtx, rtx, 794 rtx)); 795 796 #ifdef TREE_CODE /* Don't lose if tree.h not included. */ 797 extern void mark_seen_cases PARAMS ((tree, unsigned char *, 798 HOST_WIDE_INT, int)); 799 #endif 800 801 extern int vector_mode_valid_p PARAMS ((enum machine_mode)); 802