X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Freload.h;h=883d1416ee37d10e7626f89757d9b0c1744babf9;hp=d86542fa5053c8e270a8f5e11e6dd4da71d65e18;hb=4e4c89ecdf082d0ea8a21af9c78b969a989cf62d;hpb=3afef759ef0f332957b8d41ff039085d064cc25e diff --git a/gcc/reload.h b/gcc/reload.h index d86542fa505..883d1416ee3 100644 --- a/gcc/reload.h +++ b/gcc/reload.h @@ -1,22 +1,22 @@ -/* Communication between reload.c and reload1.c. - Copyright (C) 1987, 91-95, 1997, 1998 Free Software Foundation, Inc. +/* Communication between reload.c, reload1.c and the rest of compiler. + Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999, + 2000, 2001, 2003, 2004, 2007, 2008 Free Software Foundation, Inc. -This file is part of GNU CC. +This file is part of GCC. -GNU CC 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 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 3, or (at your option) any later +version. -GNU CC 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. +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 GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ +along with GCC; see the file COPYING3. If not see +. */ /* If secondary reloads are the same for inputs and outputs, define those @@ -29,49 +29,16 @@ Boston, MA 02111-1307, USA. */ SECONDARY_RELOAD_CLASS (CLASS, MODE, X) #endif -/* If either macro is defined, show that we need secondary reloads. */ -#if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS) -#define HAVE_SECONDARY_RELOADS -#endif - /* If MEMORY_MOVE_COST isn't defined, give it a default here. */ #ifndef MEMORY_MOVE_COST -#ifdef HAVE_SECONDARY_RELOADS #define MEMORY_MOVE_COST(MODE,CLASS,IN) \ (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN))) -#else -#define MEMORY_MOVE_COST(MODE,CLASS,IN) 4 -#endif #endif -extern int memory_move_secondary_cost PROTO ((enum machine_mode, enum reg_class, int)); - -/* See reload.c and reload1.c for comments on these variables. */ +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)) -extern enum reg_class reload_address_base_reg_class; -extern enum reg_class reload_address_index_reg_class; -extern rtx reload_in[MAX_RELOADS]; -extern rtx reload_out[MAX_RELOADS]; -extern rtx reload_in_reg[MAX_RELOADS]; -extern enum reg_class reload_reg_class[MAX_RELOADS]; -extern enum machine_mode reload_inmode[MAX_RELOADS]; -extern enum machine_mode reload_outmode[MAX_RELOADS]; -extern char reload_optional[MAX_RELOADS]; -extern int reload_inc[MAX_RELOADS]; -extern int reload_opnum[MAX_RELOADS]; -extern int reload_secondary_p[MAX_RELOADS]; -extern int reload_secondary_in_reload[MAX_RELOADS]; -extern int reload_secondary_out_reload[MAX_RELOADS]; -#ifdef MAX_INSN_CODE -extern enum insn_code reload_secondary_in_icode[MAX_RELOADS]; -extern enum insn_code reload_secondary_out_icode[MAX_RELOADS]; -#endif -extern int n_reloads; - -extern rtx reload_reg_rtx[MAX_RELOADS]; - /* Encode the usage of a reload. The following codes are supported: RELOAD_FOR_INPUT reload of an input operand @@ -91,26 +58,116 @@ extern rtx reload_reg_rtx[MAX_RELOADS]; 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. + 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, 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 }; -extern enum reload_type reload_when_needed[MAX_RELOADS]; +#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 rclass; + + /* 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. */ @@ -126,124 +183,196 @@ 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. */ + 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; -#ifdef MAX_INSN_CODE -/* These arrays record the insn_code of insns that may be needed to - perform input and output reloads of special objects. They provide a - place to pass a scratch register. */ -extern enum insn_code reload_in_optab[]; -extern enum insn_code reload_out_optab[]; +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 rtx of the insn. */ + rtx insn; + + /* The basic block this insn is in. */ + int block; + + /* 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; + + /* Register life information: record all live hard registers, and + all live pseudos that have a hard register. This set also + contains pseudos spilled by IRA. */ + 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; +}; + +/* 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: */ -/* Return a memory location that will be used to copy X in mode MODE. +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 PROTO((rtx, enum machine_mode, - int, enum reload_type)); +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 PROTO((void)); +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 PROTO((int, int)); +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 PROTO((rtx, rtx)); - -/* Return the number of times character C occurs in string S. */ -extern int n_occurrences PROTO((int, char *)); +extern int operands_match_p (rtx, rtx); -/* Return 1 if altering OP will not modify the value of CLOBBER. */ -extern int safe_from_earlyclobber PROTO((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 void find_reloads PROTO((rtx, int, int, int, short *)); +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 PROTO((rtx, rtx)); +extern rtx form_sum (enum machine_mode, rtx, rtx); /* Substitute into the current INSN the registers into which we have reloaded the things that need reloading. */ -extern void subst_reloads PROTO((void)); +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 PROTO((rtx, rtx)); +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 PROTO((rtx *)); - -/* Return nonzero if register in range [REGNO, ENDREGNO) - appears either explicitly or implicitly in X - other than being stored into. */ -extern int refers_to_regno_for_reload_p PROTO((int, int, rtx, rtx *)); +extern rtx find_replacement (rtx *); /* Nonzero if modifying X will affect IN. */ -extern int reg_overlap_mentioned_for_reload_p PROTO((rtx, rtx)); - -/* Return nonzero if anything in X contains a MEM. Look also for pseudo - registers. */ -extern int refers_to_mem_for_reload_p PROTO((rtx)); +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 PROTO((rtx, rtx, enum reg_class, int, short *, - int, enum machine_mode)); +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 PROTO((int, rtx)); +extern int regno_clobbered_p (unsigned int, rtx, enum machine_mode, int); -/* Functions in reload1.c: */ +/* 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); -int count_occurrences PROTO((rtx, rtx)); +/* 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 PROTO((void)); +extern void init_reload (void); /* The reload pass itself. */ -extern int reload PROTO((rtx, int, FILE *)); +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 PROTO((int)); +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 PROTO((rtx, enum machine_mode, rtx)); +extern rtx eliminate_regs (rtx, enum machine_mode, rtx); +extern bool elimination_target_reg_p (rtx); -/* Emit code to perform a reload from IN (which may be a reload register) to - OUT (which may also be a reload register). IN or OUT is from operand - OPNUM with reload type TYPE. */ -extern rtx gen_reload PROTO((rtx, rtx, int, enum reload_type)); +/* Deallocate the reload register used by reload number R. */ +extern void deallocate_reload_reg (int r); + +/* True if caller-save has been reinitialized. */ +extern bool caller_save_initialized_p; /* Functions in caller-save.c: */ /* Initialize for caller-save. */ -extern void init_caller_save PROTO((void)); +extern void init_caller_save (void); /* Initialize save areas by showing that we haven't allocated any yet. */ -extern void init_save_areas PROTO((void)); +extern void init_save_areas (void); /* Allocate save areas for any hard registers that might need saving. */ -extern int setup_save_areas PROTO((int *)); +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 PROTO((enum machine_mode)); +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);