expr.h revision 169689
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, 2004, 2005, 2006 4 Free Software Foundation, Inc. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 2, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING. If not, write to the Free 20Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2102110-1301, USA. */ 22 23#ifndef GCC_EXPR_H 24#define GCC_EXPR_H 25 26/* For inhibit_defer_pop */ 27#include "function.h" 28/* For XEXP, GEN_INT, rtx_code */ 29#include "rtl.h" 30/* For optimize_size */ 31#include "flags.h" 32/* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int, 33 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */ 34#include "tree.h" 35/* For GET_MODE_BITSIZE, word_mode */ 36#include "machmode.h" 37 38/* The default branch cost is 1. */ 39#ifndef BRANCH_COST 40#define BRANCH_COST 1 41#endif 42 43/* This is the 4th arg to `expand_expr'. 44 EXPAND_STACK_PARM means we are possibly expanding a call param onto 45 the stack. 46 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. 47 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. 48 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address 49 is a constant that is not a legitimate address. 50 EXPAND_WRITE means we are only going to write to the resulting rtx. 51 EXPAND_MEMORY means we are interested in a memory result, even if 52 the memory is constant and we could have propagated a constant value. */ 53enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, 54 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, 55 EXPAND_MEMORY}; 56 57/* Prevent the compiler from deferring stack pops. See 58 inhibit_defer_pop for more information. */ 59#define NO_DEFER_POP (inhibit_defer_pop += 1) 60 61/* Allow the compiler to defer stack pops. See inhibit_defer_pop for 62 more information. */ 63#define OK_DEFER_POP (inhibit_defer_pop -= 1) 64 65/* If a memory-to-memory move would take MOVE_RATIO or more simple 66 move-instruction sequences, we will do a movmem or libcall instead. */ 67 68#ifndef MOVE_RATIO 69#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti) 70#define MOVE_RATIO 2 71#else 72/* If we are optimizing for space (-Os), cut down the default move ratio. */ 73#define MOVE_RATIO (optimize_size ? 3 : 15) 74#endif 75#endif 76 77/* If a clear memory operation would take CLEAR_RATIO or more simple 78 move-instruction sequences, we will do a setmem or libcall instead. */ 79 80#ifndef CLEAR_RATIO 81#if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti) 82#define CLEAR_RATIO 2 83#else 84/* If we are optimizing for space, cut down the default clear ratio. */ 85#define CLEAR_RATIO (optimize_size ? 3 : 15) 86#endif 87#endif 88 89enum direction {none, upward, downward}; 90 91/* Structure to record the size of a sequence of arguments 92 as the sum of a tree-expression and a constant. This structure is 93 also used to store offsets from the stack, which might be negative, 94 so the variable part must be ssizetype, not sizetype. */ 95 96struct args_size 97{ 98 HOST_WIDE_INT constant; 99 tree var; 100}; 101 102/* Package up various arg related fields of struct args for 103 locate_and_pad_parm. */ 104struct locate_and_pad_arg_data 105{ 106 /* Size of this argument on the stack, rounded up for any padding it 107 gets. If REG_PARM_STACK_SPACE is defined, then register parms are 108 counted here, otherwise they aren't. */ 109 struct args_size size; 110 /* Offset of this argument from beginning of stack-args. */ 111 struct args_size offset; 112 /* Offset to the start of the stack slot. Different from OFFSET 113 if this arg pads downward. */ 114 struct args_size slot_offset; 115 /* The amount that the stack pointer needs to be adjusted to 116 force alignment for the next argument. */ 117 struct args_size alignment_pad; 118 /* Which way we should pad this arg. */ 119 enum direction where_pad; 120 /* slot_offset is at least this aligned. */ 121 unsigned int boundary; 122}; 123 124/* Add the value of the tree INC to the `struct args_size' TO. */ 125 126#define ADD_PARM_SIZE(TO, INC) \ 127do { \ 128 tree inc = (INC); \ 129 if (host_integerp (inc, 0)) \ 130 (TO).constant += tree_low_cst (inc, 0); \ 131 else if ((TO).var == 0) \ 132 (TO).var = fold_convert (ssizetype, inc); \ 133 else \ 134 (TO).var = size_binop (PLUS_EXPR, (TO).var, \ 135 fold_convert (ssizetype, inc)); \ 136} while (0) 137 138#define SUB_PARM_SIZE(TO, DEC) \ 139do { \ 140 tree dec = (DEC); \ 141 if (host_integerp (dec, 0)) \ 142 (TO).constant -= tree_low_cst (dec, 0); \ 143 else if ((TO).var == 0) \ 144 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ 145 fold_convert (ssizetype, dec)); \ 146 else \ 147 (TO).var = size_binop (MINUS_EXPR, (TO).var, \ 148 fold_convert (ssizetype, dec)); \ 149} while (0) 150 151/* Convert the implicit sum in a `struct args_size' into a tree 152 of type ssizetype. */ 153#define ARGS_SIZE_TREE(SIZE) \ 154((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ 155 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \ 156 ssize_int ((SIZE).constant))) 157 158/* Convert the implicit sum in a `struct args_size' into an rtx. */ 159#define ARGS_SIZE_RTX(SIZE) \ 160((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \ 161 : expand_normal (ARGS_SIZE_TREE (SIZE))) 162 163/* Supply a default definition for FUNCTION_ARG_PADDING: 164 usually pad upward, but pad short args downward on 165 big-endian machines. */ 166 167#define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \ 168 (! BYTES_BIG_ENDIAN \ 169 ? upward \ 170 : (((MODE) == BLKmode \ 171 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \ 172 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \ 173 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \ 174 ? downward : upward)) 175 176#ifndef FUNCTION_ARG_PADDING 177#define FUNCTION_ARG_PADDING(MODE, TYPE) \ 178 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE)) 179#endif 180 181/* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let 182 FUNCTION_ARG_PADDING, which also pads the length, handle any needed 183 alignment. */ 184 185#ifndef FUNCTION_ARG_BOUNDARY 186#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY 187#endif 188 189/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save. 190 Normally move_insn, so Pmode stack pointer. */ 191 192#ifndef STACK_SAVEAREA_MODE 193#define STACK_SAVEAREA_MODE(LEVEL) Pmode 194#endif 195 196/* Supply a default definition of STACK_SIZE_MODE for 197 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */ 198 199#ifndef STACK_SIZE_MODE 200#define STACK_SIZE_MODE word_mode 201#endif 202 203/* Provide default values for the macros controlling stack checking. */ 204 205#ifndef STACK_CHECK_BUILTIN 206#define STACK_CHECK_BUILTIN 0 207#endif 208 209/* The default interval is one page. */ 210#ifndef STACK_CHECK_PROBE_INTERVAL 211#define STACK_CHECK_PROBE_INTERVAL 4096 212#endif 213 214/* The default is to do a store into the stack. */ 215#ifndef STACK_CHECK_PROBE_LOAD 216#define STACK_CHECK_PROBE_LOAD 0 217#endif 218 219/* This value is arbitrary, but should be sufficient for most machines. */ 220#ifndef STACK_CHECK_PROTECT 221#define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD) 222#endif 223 224/* Make the maximum frame size be the largest we can and still only need 225 one probe per function. */ 226#ifndef STACK_CHECK_MAX_FRAME_SIZE 227#define STACK_CHECK_MAX_FRAME_SIZE \ 228 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD) 229#endif 230 231/* This is arbitrary, but should be large enough everywhere. */ 232#ifndef STACK_CHECK_FIXED_FRAME_SIZE 233#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD) 234#endif 235 236/* Provide a reasonable default for the maximum size of an object to 237 allocate in the fixed frame. We may need to be able to make this 238 controllable by the user at some point. */ 239#ifndef STACK_CHECK_MAX_VAR_SIZE 240#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100) 241#endif 242 243/* Functions from optabs.c, commonly used, and without need for the optabs 244 tables: */ 245 246/* Passed to expand_simple_binop and expand_binop to say which options 247 to try to use if the requested operation can't be open-coded on the 248 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using 249 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try 250 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't 251 try anything else. */ 252 253enum optab_methods 254{ 255 OPTAB_DIRECT, 256 OPTAB_LIB, 257 OPTAB_WIDEN, 258 OPTAB_LIB_WIDEN, 259 OPTAB_MUST_WIDEN 260}; 261 262/* Generate code for a simple binary or unary operation. "Simple" in 263 this case means "can be unambiguously described by a (mode, code) 264 pair and mapped to a single optab." */ 265extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx, 266 rtx, rtx, int, enum optab_methods); 267extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx, 268 int); 269 270/* Report whether the machine description contains an insn which can 271 perform the operation described by CODE and MODE. */ 272extern int have_insn_for (enum rtx_code, enum machine_mode); 273 274/* Emit code to make a call to a constant function or a library call. */ 275extern void emit_libcall_block (rtx, rtx, rtx, rtx); 276 277/* Create but don't emit one rtl instruction to perform certain operations. 278 Modes must match; operands must meet the operation's predicates. 279 Likewise for subtraction and for just copying. */ 280extern rtx gen_add2_insn (rtx, rtx); 281extern rtx gen_add3_insn (rtx, rtx, rtx); 282extern rtx gen_sub2_insn (rtx, rtx); 283extern rtx gen_sub3_insn (rtx, rtx, rtx); 284extern rtx gen_move_insn (rtx, rtx); 285extern int have_add2_insn (rtx, rtx); 286extern int have_sub2_insn (rtx, rtx); 287 288/* Emit a pair of rtl insns to compare two rtx's and to jump 289 to a label if the comparison is true. */ 290extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx, 291 enum machine_mode, int, rtx); 292 293/* Generate code to indirectly jump to a location given in the rtx LOC. */ 294extern void emit_indirect_jump (rtx); 295 296/* Generate a conditional trap instruction. */ 297extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx); 298 299#include "insn-config.h" 300 301#ifdef HAVE_conditional_move 302/* Emit a conditional move operation. */ 303rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 304 rtx, rtx, enum machine_mode, int); 305 306/* Return nonzero if the conditional move is supported. */ 307int can_conditionally_move_p (enum machine_mode mode); 308 309#endif 310rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 311 rtx, rtx, enum machine_mode, int); 312 313rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx); 314rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx); 315rtx expand_sync_operation (rtx, rtx, enum rtx_code); 316rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx); 317rtx expand_sync_lock_test_and_set (rtx, rtx, rtx); 318 319/* Functions from expmed.c: */ 320 321/* Arguments MODE, RTX: return an rtx for the negation of that value. 322 May emit insns. */ 323extern rtx negate_rtx (enum machine_mode, rtx); 324 325/* Expand a logical AND operation. */ 326extern rtx expand_and (enum machine_mode, rtx, rtx, rtx); 327 328/* Emit a store-flag operation. */ 329extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 330 int, int); 331 332/* Like emit_store_flag, but always succeeds. */ 333extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx, 334 enum machine_mode, int, int); 335 336/* Functions from builtins.c: */ 337extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int); 338extern tree std_build_builtin_va_list (void); 339extern void std_expand_builtin_va_start (tree, rtx); 340extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int); 341extern void expand_builtin_setjmp_setup (rtx, rtx); 342extern void expand_builtin_setjmp_receiver (rtx); 343extern rtx expand_builtin_saveregs (void); 344extern void expand_builtin_trap (void); 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. */ 350extern void init_expr_once (void); 351 352/* This is run at the start of compiling a function. */ 353extern void init_expr (void); 354 355/* Emit some rtl insns to move data between rtx's, converting machine modes. 356 Both modes must be floating or both fixed. */ 357extern void convert_move (rtx, rtx, int); 358 359/* Convert an rtx to specified machine mode and return the result. */ 360extern rtx convert_to_mode (enum machine_mode, rtx, int); 361 362/* Convert an rtx to MODE from OLDMODE and return the result. */ 363extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int); 364 365/* Emit code to move a block Y to a block X. */ 366 367enum block_op_methods 368{ 369 BLOCK_OP_NORMAL, 370 BLOCK_OP_NO_LIBCALL, 371 BLOCK_OP_CALL_PARM, 372 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ 373 BLOCK_OP_TAILCALL 374}; 375 376extern void init_block_move_fn (const char *); 377extern void init_block_clear_fn (const char *); 378 379extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); 380 381/* Copy all or part of a value X into registers starting at REGNO. 382 The number of registers to be filled is NREGS. */ 383extern void move_block_to_reg (int, rtx, int, enum machine_mode); 384 385/* Copy all or part of a BLKmode value X out of registers starting at REGNO. 386 The number of registers to be filled is NREGS. */ 387extern void move_block_from_reg (int, rtx, int); 388 389/* Generate a non-consecutive group of registers represented by a PARALLEL. */ 390extern rtx gen_group_rtx (rtx); 391 392/* Load a BLKmode value into non-consecutive registers represented by a 393 PARALLEL. */ 394extern void emit_group_load (rtx, rtx, tree, int); 395 396/* Similarly, but load into new temporaries. */ 397extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); 398 399/* Move a non-consecutive group of registers represented by a PARALLEL into 400 a non-consecutive group of registers represented by a PARALLEL. */ 401extern void emit_group_move (rtx, rtx); 402 403/* Move a group of registers represented by a PARALLEL into pseudos. */ 404extern rtx emit_group_move_into_temps (rtx); 405 406/* Store a BLKmode value from non-consecutive registers represented by a 407 PARALLEL. */ 408extern void emit_group_store (rtx, rtx, tree, int); 409 410/* Copy BLKmode object from a set of registers. */ 411extern rtx copy_blkmode_from_reg (rtx, rtx, tree); 412 413/* Mark REG as holding a parameter for the next CALL_INSN. */ 414extern void use_reg (rtx *, rtx); 415 416/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters 417 for the next CALL_INSN. */ 418extern void use_regs (rtx *, int, int); 419 420/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ 421extern void use_group_regs (rtx *, rtx); 422 423/* Write zeros through the storage of OBJECT. 424 If OBJECT has BLKmode, SIZE is its length in bytes. */ 425extern rtx clear_storage (rtx, rtx, enum block_op_methods); 426 427/* Expand a setmem pattern; return true if successful. */ 428extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int); 429 430/* Determine whether the LEN bytes can be moved by using several move 431 instructions. Return nonzero if a call to move_by_pieces should 432 succeed. */ 433extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); 434 435/* Return nonzero if it is desirable to store LEN bytes generated by 436 CONSTFUN with several move instructions by store_by_pieces 437 function. CONSTFUNDATA is a pointer which will be passed as argument 438 in every CONSTFUN call. 439 ALIGN is maximum alignment we can assume. */ 440extern int can_store_by_pieces (unsigned HOST_WIDE_INT, 441 rtx (*) (void *, HOST_WIDE_INT, 442 enum machine_mode), 443 void *, unsigned int); 444 445/* Generate several move instructions to store LEN bytes generated by 446 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a 447 pointer which will be passed as argument in every CONSTFUN call. 448 ALIGN is maximum alignment we can assume. 449 Returns TO + LEN. */ 450extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, 451 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), 452 void *, unsigned int, int); 453 454/* Emit insns to set X from Y. */ 455extern rtx emit_move_insn (rtx, rtx); 456 457/* Emit insns to set X from Y, with no frills. */ 458extern rtx emit_move_insn_1 (rtx, rtx); 459 460/* Push a block of length SIZE (perhaps variable) 461 and return an rtx to address the beginning of the block. */ 462extern rtx push_block (rtx, int, int); 463 464/* Generate code to push something onto the stack, given its mode and type. */ 465extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int, 466 int, rtx, int, rtx, rtx, int, rtx); 467 468/* Expand an assignment that stores the value of FROM into TO. */ 469extern void expand_assignment (tree, tree); 470 471/* Generate code for computing expression EXP, 472 and storing the value into TARGET. 473 If SUGGEST_REG is nonzero, copy the value through a register 474 and return that register, if that is possible. */ 475extern rtx store_expr (tree, rtx, int); 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. */ 480extern rtx force_operand (rtx, rtx); 481 482/* Work horse for expand_expr. */ 483extern rtx expand_expr_real (tree, rtx, enum machine_mode, 484 enum expand_modifier, rtx *); 485 486/* Generate code for computing expression EXP. 487 An rtx for the computed value is returned. The value is never null. 488 In the case of a void EXP, const0_rtx is returned. */ 489static inline rtx 490expand_expr (tree exp, rtx target, enum machine_mode mode, 491 enum expand_modifier modifier) 492{ 493 return expand_expr_real (exp, target, mode, modifier, NULL); 494} 495 496static inline rtx 497expand_normal (tree exp) 498{ 499 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL); 500} 501 502extern void expand_var (tree); 503 504/* At the start of a function, record that we have no previously-pushed 505 arguments waiting to be popped. */ 506extern void init_pending_stack_adjust (void); 507 508/* Discard any pending stack adjustment. */ 509extern void discard_pending_stack_adjust (void); 510 511/* When exiting from function, if safe, clear out any pending stack adjust 512 so the adjustment won't get done. */ 513extern void clear_pending_stack_adjust (void); 514 515/* Pop any previously-pushed arguments that have not been popped yet. */ 516extern void do_pending_stack_adjust (void); 517 518/* Return the tree node and offset if a given argument corresponds to 519 a string constant. */ 520extern tree string_constant (tree, tree *); 521 522/* Generate code to evaluate EXP and jump to LABEL if the value is zero. */ 523extern void jumpifnot (tree, rtx); 524 525/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ 526extern void jumpif (tree, rtx); 527 528/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if 529 the result is zero, or IF_TRUE_LABEL if the result is one. */ 530extern void do_jump (tree, rtx, rtx); 531 532/* Generate rtl to compare two rtx's, will call emit_cmp_insn. */ 533extern rtx compare_from_rtx (rtx, rtx, enum rtx_code, int, enum machine_mode, 534 rtx); 535extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int, 536 enum machine_mode, rtx, rtx, rtx); 537 538/* Two different ways of generating switch statements. */ 539extern int try_casesi (tree, tree, tree, tree, rtx, rtx); 540extern int try_tablejump (tree, tree, tree, tree, rtx, rtx); 541 542/* Smallest number of adjacent cases before we use a jump table. 543 XXX Should be a target hook. */ 544extern unsigned int case_values_threshold (void); 545 546/* Functions from alias.c */ 547#include "alias.h" 548 549 550/* rtl.h and tree.h were included. */ 551/* Return an rtx for the size in bytes of the value of an expr. */ 552extern rtx expr_size (tree); 553 554/* Return a wide integer for the size in bytes of the value of EXP, or -1 555 if the size can vary or is larger than an integer. */ 556extern HOST_WIDE_INT int_expr_size (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. */ 560extern rtx hard_function_value (tree, tree, tree, int); 561 562extern rtx prepare_call_address (rtx, rtx, rtx *, int, int); 563 564extern bool shift_return_value (enum machine_mode, bool, rtx); 565 566extern rtx expand_call (tree, rtx, int); 567 568extern void fixup_tail_calls (void); 569 570#ifdef TREE_CODE 571extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx, 572 int); 573extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx, 574 rtx, int); 575#endif 576 577extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree, 578 struct args_size *, 579 struct locate_and_pad_arg_data *); 580 581/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */ 582extern rtx label_rtx (tree); 583 584/* As label_rtx, but additionally the label is placed on the forced label 585 list of its containing function (i.e. it is treated as reachable even 586 if how is not obvious). */ 587extern rtx force_label_rtx (tree); 588 589/* Indicate how an input argument register was promoted. */ 590extern rtx promoted_input_arg (unsigned int, enum machine_mode *, int *); 591 592/* Return an rtx like arg but sans any constant terms. 593 Returns the original rtx if it has no constant terms. 594 The constant terms are added and stored via a second arg. */ 595extern rtx eliminate_constant_term (rtx, rtx *); 596 597/* Convert arg to a valid memory address for specified machine mode, 598 by emitting insns to perform arithmetic if nec. */ 599extern rtx memory_address (enum machine_mode, rtx); 600 601/* Like `memory_address' but pretend `flag_force_addr' is 0. */ 602extern rtx memory_address_noforce (enum machine_mode, rtx); 603 604/* Return a memory reference like MEMREF, but with its mode changed 605 to MODE and its address changed to ADDR. 606 (VOIDmode means don't change the mode. 607 NULL for ADDR means don't change the address.) */ 608extern rtx change_address (rtx, enum machine_mode, rtx); 609 610/* Return a memory reference like MEMREF, but with its mode changed 611 to MODE and its address offset by OFFSET bytes. */ 612#define adjust_address(MEMREF, MODE, OFFSET) \ 613 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1) 614 615/* Likewise, but the reference is not required to be valid. */ 616#define adjust_address_nv(MEMREF, MODE, OFFSET) \ 617 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1) 618 619/* Return a memory reference like MEMREF, but with its mode changed 620 to MODE and its address changed to ADDR, which is assumed to be 621 increased by OFFSET bytes from MEMREF. */ 622#define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \ 623 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1) 624 625/* Likewise, but the reference is not required to be valid. */ 626#define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \ 627 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0) 628 629extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int); 630extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx, 631 HOST_WIDE_INT, int); 632 633/* Return a memory reference like MEMREF, but whose address is changed by 634 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor 635 known to be in OFFSET (possibly 1). */ 636extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT); 637 638/* Definitions from emit-rtl.c */ 639#include "emit-rtl.h" 640 641/* Return a memory reference like MEMREF, but with its mode widened to 642 MODE and adjusted by OFFSET. */ 643extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT); 644 645/* Return a memory reference like MEMREF, but which is known to have a 646 valid address. */ 647extern rtx validize_mem (rtx); 648 649extern rtx use_anchored_address (rtx); 650 651/* Given REF, a MEM, and T, either the type of X or the expression 652 corresponding to REF, set the memory attributes. OBJECTP is nonzero 653 if we are making a new object of this type. */ 654extern void set_mem_attributes (rtx, tree, int); 655 656/* Similar, except that BITPOS has not yet been applied to REF, so if 657 we alter MEM_OFFSET according to T then we should subtract BITPOS 658 expecting that it'll be added back in later. */ 659extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT); 660 661/* Assemble the static constant template for function entry trampolines. */ 662extern rtx assemble_trampoline_template (void); 663 664/* Copy given rtx to a new temp reg and return that. */ 665extern rtx copy_to_reg (rtx); 666 667/* Like copy_to_reg but always make the reg Pmode. */ 668extern rtx copy_addr_to_reg (rtx); 669 670/* Like copy_to_reg but always make the reg the specified mode MODE. */ 671extern rtx copy_to_mode_reg (enum machine_mode, rtx); 672 673/* Copy given rtx to given temp reg and return that. */ 674extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode); 675 676/* Copy a value to a register if it isn't already a register. 677 Args are mode (in case value is a constant) and the value. */ 678extern rtx force_reg (enum machine_mode, rtx); 679 680/* Return given rtx, copied into a new temp reg if it was in memory. */ 681extern rtx force_not_mem (rtx); 682 683/* Return mode and signedness to use when object is promoted. */ 684extern enum machine_mode promote_mode (tree, enum machine_mode, int *, int); 685 686/* Remove some bytes from the stack. An rtx says how many. */ 687extern void adjust_stack (rtx); 688 689/* Add some bytes to the stack. An rtx says how many. */ 690extern void anti_adjust_stack (rtx); 691 692/* This enum is used for the following two functions. */ 693enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 694 695/* Save the stack pointer at the specified level. */ 696extern void emit_stack_save (enum save_level, rtx *, rtx); 697 698/* Restore the stack pointer from a save area of the specified level. */ 699extern void emit_stack_restore (enum save_level, rtx, rtx); 700 701/* Invoke emit_stack_save for the nonlocal_goto_save_area. */ 702extern void update_nonlocal_goto_save_area (void); 703 704/* Allocate some space on the stack dynamically and return its address. An rtx 705 says how many bytes. */ 706extern rtx allocate_dynamic_stack_space (rtx, rtx, int); 707 708/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 709 FIRST is a constant and size is a Pmode RTX. These are offsets from the 710 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or 711 subtract from the stack. If SIZE is constant, this is done 712 with a fixed number of probes. Otherwise, we must make a loop. */ 713extern void probe_stack_range (HOST_WIDE_INT, rtx); 714 715/* Return an rtx that refers to the value returned by a library call 716 in its original home. This becomes invalid if any more code is emitted. */ 717extern rtx hard_libcall_value (enum machine_mode); 718 719/* Return the mode desired by operand N of a particular bitfield 720 insert/extract insn, or MAX_MACHINE_MODE if no such insn is 721 available. */ 722 723enum extraction_pattern { EP_insv, EP_extv, EP_extzv }; 724extern enum machine_mode 725mode_for_extraction (enum extraction_pattern, int); 726 727extern rtx store_bit_field (rtx, unsigned HOST_WIDE_INT, 728 unsigned HOST_WIDE_INT, enum machine_mode, rtx); 729extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT, 730 unsigned HOST_WIDE_INT, int, rtx, 731 enum machine_mode, enum machine_mode); 732extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int); 733extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int); 734 735extern rtx assemble_static_space (unsigned HOST_WIDE_INT); 736extern int safe_from_p (rtx, tree, int); 737 738/* Call this once to initialize the contents of the optabs 739 appropriately for the current target machine. */ 740extern void init_optabs (void); 741extern void init_all_optabs (void); 742 743/* Call this to initialize an optab function entry. */ 744extern rtx init_one_libfunc (const char *); 745 746extern int vector_mode_valid_p (enum machine_mode); 747 748#endif /* GCC_EXPR_H */ 749