/* 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 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.
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.
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, 675 Mass Ave, Cambridge, MA 02139, 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_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
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));
