/* Communication between reload.c and reload1.c.   Copyright (C) 1987, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.This file is part of GNU CC.GNU CC is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, 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 ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU CC; see the file COPYING.  If not, write tothe Free Software Foundation, 59 Temple Place - Suite 330,Boston, MA 02111-1307, 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 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/* See reload.c and reload1.c for comments on these variables.  *//* Maximum number of reloads we can need.  */#define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))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_CODEextern enum insn_code reload_secondary_in_icode[MAX_RELOADS];extern enum insn_code reload_secondary_out_icode[MAX_RELOADS];#endifextern 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   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_OUTPUT_ADDRESS	likewise, for output reload   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_OUTPUT_ADDRESS,  RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR,  RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS};extern enum reload_type reload_when_needed[MAX_RELOADS];extern rtx *reg_equiv_constant;extern rtx *reg_equiv_memory_loc;extern rtx *reg_equiv_address;extern rtx *reg_equiv_mem;/* 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;#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[];#endif/* Functions from reload.c:  *//* 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));/* Clear any secondary memory locations we've made.  */extern void clear_secondary_mem PROTO((void));/* Transfer all replacements that used to be in reload FROM to be in   reload TO.  */extern void transfer_replacements PROTO((int, int));/* Return 1 if ADDR is a valid memory address for mode MODE,   and check that each pseudo reg has the proper kind of   hard reg.  */extern int strict_memory_address_p PROTO((enum machine_mode, 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 *));/* Return 1 if altering OP will not modify the value of CLOBBER. */extern int safe_from_earlyclobber PROTO((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 *));/* 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));/* Substitute into the current INSN the registers into which we have reloaded   the things that need reloading.  */extern void subst_reloads PROTO((void));/* 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));/* 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 *));/* 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));/* 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));/* Return 1 if register REGNO is the subject of a clobber in insn INSN.  */extern int regno_clobbered_p PROTO((int, rtx));/* Functions in reload1.c:  *//* Initialize the reload pass once per compilation.  */extern void init_reload PROTO((void));/* The reload pass itself.  */extern int reload STDIO_PROTO((rtx, int, FILE *));/* Mark the slots in regs_ever_live for the hard regs   used by pseudo-reg number REGNO.  */extern void mark_home_live PROTO((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));/* 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));/* Functions in caller-save.c:  *//* Initialize for caller-save.  */extern void init_caller_save PROTO((void));/* Initialize save areas by showing that we haven't allocated any yet.  */extern void init_save_areas PROTO((void));/* Allocate save areas for any hard registers that might need saving.  */extern int setup_save_areas PROTO((int *));/* Find the places where hard regs are live across calls and save them.  */extern void save_call_clobbered_regs PROTO((enum machine_mode));