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Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/reload.h')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/reload.h | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/reload.h b/gcc-4.2.1-5666.3/gcc/reload.h new file mode 100644 index 000000000..6de5e8471 --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/reload.h @@ -0,0 +1,372 @@ +/* Communication between reload.c and reload1.c. + Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998, + 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + + +/* If secondary reloads are the same for inputs and outputs, define those + macros here. */ + +#ifdef SECONDARY_RELOAD_CLASS +#define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \ + SECONDARY_RELOAD_CLASS (CLASS, MODE, X) +#define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \ + SECONDARY_RELOAD_CLASS (CLASS, MODE, X) +#endif + +/* If MEMORY_MOVE_COST isn't defined, give it a default here. */ +#ifndef MEMORY_MOVE_COST +#define MEMORY_MOVE_COST(MODE,CLASS,IN) \ + (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN))) +#endif +extern int memory_move_secondary_cost (enum machine_mode, enum reg_class, int); + +/* Maximum number of reloads we can need. */ +#define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1)) + +/* Encode the usage of a reload. The following codes are supported: + + RELOAD_FOR_INPUT reload of an input operand + RELOAD_FOR_OUTPUT likewise, for output + RELOAD_FOR_INSN a reload that must not conflict with anything + used in the insn, but may conflict with + something used before or after the insn + RELOAD_FOR_INPUT_ADDRESS reload for parts of the address of an object + that is an input reload + RELOAD_FOR_INPADDR_ADDRESS reload needed for RELOAD_FOR_INPUT_ADDRESS + RELOAD_FOR_OUTPUT_ADDRESS like RELOAD_FOR INPUT_ADDRESS, for output + RELOAD_FOR_OUTADDR_ADDRESS reload needed for RELOAD_FOR_OUTPUT_ADDRESS + RELOAD_FOR_OPERAND_ADDRESS reload for the address of a non-reloaded + operand; these don't conflict with + any other addresses. + RELOAD_FOR_OPADDR_ADDR reload needed for RELOAD_FOR_OPERAND_ADDRESS + reloads; usually secondary reloads + RELOAD_OTHER none of the above, usually multiple uses + RELOAD_FOR_OTHER_ADDRESS reload for part of the address of an input + that is marked RELOAD_OTHER. + + This used to be "enum reload_when_needed" but some debuggers have trouble + with an enum tag and variable of the same name. */ + +enum reload_type +{ + RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN, + RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_INPADDR_ADDRESS, + RELOAD_FOR_OUTPUT_ADDRESS, RELOAD_FOR_OUTADDR_ADDRESS, + RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR, + RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS +}; + +#ifdef GCC_INSN_CODES_H +/* Each reload is recorded with a structure like this. */ +struct reload +{ + /* The value to reload from */ + rtx in; + /* Where to store reload-reg afterward if nec (often the same as + reload_in) */ + rtx out; + + /* The class of registers to reload into. */ + enum reg_class class; + + /* The mode this operand should have when reloaded, on input. */ + enum machine_mode inmode; + /* The mode this operand should have when reloaded, on output. */ + enum machine_mode outmode; + + /* The mode of the reload register. */ + enum machine_mode mode; + + /* the largest number of registers this reload will require. */ + unsigned int nregs; + + /* Positive amount to increment or decrement by if + reload_in is a PRE_DEC, PRE_INC, POST_DEC, POST_INC. + Ignored otherwise (don't assume it is zero). */ + int inc; + /* A reg for which reload_in is the equivalent. + If reload_in is a symbol_ref which came from + reg_equiv_constant, then this is the pseudo + which has that symbol_ref as equivalent. */ + rtx in_reg; + rtx out_reg; + + /* Used in find_reload_regs to record the allocated register. */ + int regno; + /* This is the register to reload into. If it is zero when `find_reloads' + returns, you must find a suitable register in the class specified by + reload_reg_class, and store here an rtx for that register with mode from + reload_inmode or reload_outmode. */ + rtx reg_rtx; + /* The operand number being reloaded. This is used to group related reloads + and need not always be equal to the actual operand number in the insn, + though it current will be; for in-out operands, it is one of the two + operand numbers. */ + int opnum; + + /* Gives the reload number of a secondary input reload, when needed; + otherwise -1. */ + int secondary_in_reload; + /* Gives the reload number of a secondary output reload, when needed; + otherwise -1. */ + int secondary_out_reload; + /* If a secondary input reload is required, gives the INSN_CODE that uses the + secondary reload as a scratch register, or CODE_FOR_nothing if the + secondary reload register is to be an intermediate register. */ + enum insn_code secondary_in_icode; + /* Likewise, for a secondary output reload. */ + enum insn_code secondary_out_icode; + + /* Classifies reload as needed either for addressing an input reload, + addressing an output, for addressing a non-reloaded mem ref, or for + unspecified purposes (i.e., more than one of the above). */ + enum reload_type when_needed; + + /* Nonzero for an optional reload. Optional reloads are ignored unless the + value is already sitting in a register. */ + unsigned int optional:1; + /* nonzero if this reload shouldn't be combined with another reload. */ + unsigned int nocombine:1; + /* Nonzero if this is a secondary register for one or more reloads. */ + unsigned int secondary_p:1; + /* Nonzero if this reload must use a register not already allocated to a + group. */ + unsigned int nongroup:1; +}; + +extern struct reload rld[MAX_RELOADS]; +extern int n_reloads; +#endif + +extern GTY (()) VEC(rtx,gc) *reg_equiv_memory_loc_vec; +extern rtx *reg_equiv_constant; +extern rtx *reg_equiv_invariant; +extern rtx *reg_equiv_memory_loc; +extern rtx *reg_equiv_address; +extern rtx *reg_equiv_mem; +extern rtx *reg_equiv_alt_mem_list; + +/* Element N is the list of insns that initialized reg N from its equivalent + constant or memory slot. */ +extern GTY((length("reg_equiv_init_size"))) rtx *reg_equiv_init; + +/* The size of the previous array, for GC purposes. */ +extern GTY(()) int reg_equiv_init_size; + +/* All the "earlyclobber" operands of the current insn + are recorded here. */ +extern int n_earlyclobbers; +extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS]; + +/* Save the number of operands. */ +extern int reload_n_operands; + +/* First uid used by insns created by reload in this function. + Used in find_equiv_reg. */ +extern int reload_first_uid; + +/* Nonzero if indirect addressing is supported when the innermost MEM is + of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to + which these are valid is the same as spill_indirect_levels, above. */ + +extern char indirect_symref_ok; + +/* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */ +extern char double_reg_address_ok; + +extern int num_not_at_initial_offset; + +#if defined SET_HARD_REG_BIT && defined CLEAR_REG_SET +/* This structure describes instructions which are relevant for reload. + Apart from all regular insns, this also includes CODE_LABELs, since they + must be examined for register elimination. */ +struct insn_chain +{ + /* Links to the neighbor instructions. */ + struct insn_chain *next, *prev; + + /* Link through a chains set up by calculate_needs_all_insns, containing + all insns that need reloading. */ + struct insn_chain *next_need_reload; + + /* The basic block this insn is in. */ + int block; + /* The rtx of the insn. */ + rtx insn; + /* Register life information: record all live hard registers, and all + live pseudos that have a hard register. */ + regset_head live_throughout; + regset_head dead_or_set; + + /* Copies of the global variables computed by find_reloads. */ + struct reload *rld; + int n_reloads; + + /* Indicates which registers have already been used for spills. */ + HARD_REG_SET used_spill_regs; + + /* Nonzero if find_reloads said the insn requires reloading. */ + unsigned int need_reload:1; + /* Nonzero if find_reloads needs to be run during reload_as_needed to + perform modifications on any operands. */ + unsigned int need_operand_change:1; + /* Nonzero if eliminate_regs_in_insn said it requires eliminations. */ + unsigned int need_elim:1; + /* Nonzero if this insn was inserted by perform_caller_saves. */ + unsigned int is_caller_save_insn:1; +}; + +/* A chain of insn_chain structures to describe all non-note insns in + a function. */ +extern struct insn_chain *reload_insn_chain; + +/* Allocate a new insn_chain structure. */ +extern struct insn_chain *new_insn_chain (void); + +extern void compute_use_by_pseudos (HARD_REG_SET *, regset); +#endif + +/* Functions from reload.c: */ + +extern enum reg_class secondary_reload_class (bool, enum reg_class, + enum machine_mode, rtx); + +#ifdef GCC_INSN_CODES_H +extern enum reg_class scratch_reload_class (enum insn_code); +#endif + +/* Return a memory location that will be used to copy X in mode MODE. + If we haven't already made a location for this mode in this insn, + call find_reloads_address on the location being returned. */ +extern rtx get_secondary_mem (rtx, enum machine_mode, int, enum reload_type); + +/* Clear any secondary memory locations we've made. */ +extern void clear_secondary_mem (void); + +/* Transfer all replacements that used to be in reload FROM to be in + reload TO. */ +extern void transfer_replacements (int, int); + +/* IN_RTX is the value loaded by a reload that we now decided to inherit, + or a subpart of it. If we have any replacements registered for IN_RTX, + cancel the reloads that were supposed to load them. + Return nonzero if we canceled any reloads. */ +extern int remove_address_replacements (rtx in_rtx); + +/* Like rtx_equal_p except that it allows a REG and a SUBREG to match + if they are the same hard reg, and has special hacks for + autoincrement and autodecrement. */ +extern int operands_match_p (rtx, rtx); + +/* Return 1 if altering OP will not modify the value of CLOBBER. */ +extern int safe_from_earlyclobber (rtx, rtx); + +/* Search the body of INSN for values that need reloading and record them + with push_reload. REPLACE nonzero means record also where the values occur + so that subst_reloads can be used. */ +extern int find_reloads (rtx, int, int, int, short *); + +/* Compute the sum of X and Y, making canonicalizations assumed in an + address, namely: sum constant integers, surround the sum of two + constants with a CONST, put the constant as the second operand, and + group the constant on the outermost sum. */ +extern rtx form_sum (rtx, rtx); + +/* Substitute into the current INSN the registers into which we have reloaded + the things that need reloading. */ +extern void subst_reloads (rtx); + +/* Make a copy of any replacements being done into X and move those copies + to locations in Y, a copy of X. We only look at the highest level of + the RTL. */ +extern void copy_replacements (rtx, rtx); + +/* Change any replacements being done to *X to be done to *Y */ +extern void move_replacements (rtx *x, rtx *y); + +/* If LOC was scheduled to be replaced by something, return the replacement. + Otherwise, return *LOC. */ +extern rtx find_replacement (rtx *); + +/* Nonzero if modifying X will affect IN. */ +extern int reg_overlap_mentioned_for_reload_p (rtx, rtx); + +/* Check the insns before INSN to see if there is a suitable register + containing the same value as GOAL. */ +extern rtx find_equiv_reg (rtx, rtx, enum reg_class, int, short *, + int, enum machine_mode); + +/* Return 1 if register REGNO is the subject of a clobber in insn INSN. */ +extern int regno_clobbered_p (unsigned int, rtx, enum machine_mode, int); + +/* Return 1 if X is an operand of an insn that is being earlyclobbered. */ +extern int earlyclobber_operand_p (rtx); + +/* Record one reload that needs to be performed. */ +extern int push_reload (rtx, rtx, rtx *, rtx *, enum reg_class, + enum machine_mode, enum machine_mode, + int, int, int, enum reload_type); + +/* Functions in postreload.c: */ +extern void reload_cse_regs (rtx); + +/* Functions in reload1.c: */ + +/* Initialize the reload pass once per compilation. */ +extern void init_reload (void); + +/* The reload pass itself. */ +extern int reload (rtx, int); + +/* Mark the slots in regs_ever_live for the hard regs + used by pseudo-reg number REGNO. */ +extern void mark_home_live (int); + +/* Scan X and replace any eliminable registers (such as fp) with a + replacement (such as sp), plus an offset. */ +extern rtx eliminate_regs (rtx, enum machine_mode, rtx); + +/* Deallocate the reload register used by reload number R. */ +extern void deallocate_reload_reg (int r); + +/* Functions in caller-save.c: */ + +/* Initialize for caller-save. */ +extern void init_caller_save (void); + +/* Initialize save areas by showing that we haven't allocated any yet. */ +extern void init_save_areas (void); + +/* Allocate save areas for any hard registers that might need saving. */ +extern void setup_save_areas (void); + +/* Find the places where hard regs are live across calls and save them. */ +extern void save_call_clobbered_regs (void); + +/* Replace (subreg (reg)) with the appropriate (reg) for any operands. */ +extern void cleanup_subreg_operands (rtx); + +/* Debugging support. */ +extern void debug_reload_to_stream (FILE *); +extern void debug_reload (void); + +/* Compute the actual register we should reload to, in case we're + reloading to/from a register that is wider than a word. */ +extern rtx reload_adjust_reg_for_mode (rtx, enum machine_mode); |