112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/* Communication between reload.c and reload1.c.
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Copyright (C) 1987, 1991 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* If secondary reloads are the same for inputs and outputs, define those
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macros here. */
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#ifdef SECONDARY_RELOAD_CLASS
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#define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
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SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
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#define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
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SECONDARY_RELOAD_CLASS (CLASS, MODE, X)
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#endif
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/* If either macro is defined, show that we need secondary reloads. */
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#if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS)
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#define HAVE_SECONDARY_RELOADS
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#endif
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/* See reload.c and reload1.c for comments on these variables. */
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/* Maximum number of reloads we can need. */
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#define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
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extern rtx reload_in[MAX_RELOADS];
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extern rtx reload_out[MAX_RELOADS];
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extern rtx reload_in_reg[MAX_RELOADS];
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extern enum reg_class reload_reg_class[MAX_RELOADS];
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extern enum machine_mode reload_inmode[MAX_RELOADS];
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extern enum machine_mode reload_outmode[MAX_RELOADS];
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extern char reload_strict_low[MAX_RELOADS];
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extern char reload_optional[MAX_RELOADS];
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extern int reload_inc[MAX_RELOADS];
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extern int reload_needed_for_multiple[MAX_RELOADS];
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extern rtx reload_needed_for[MAX_RELOADS];
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extern int reload_secondary_reload[MAX_RELOADS];
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extern int reload_secondary_p[MAX_RELOADS];
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#ifdef MAX_INSN_CODE
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extern enum insn_code reload_secondary_icode[MAX_RELOADS];
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#endif
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extern int n_reloads;
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extern rtx reload_reg_rtx[MAX_RELOADS];
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enum reload_when_needed
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{
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RELOAD_FOR_INPUT_RELOAD_ADDRESS,
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RELOAD_FOR_OUTPUT_RELOAD_ADDRESS,
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RELOAD_FOR_OPERAND_ADDRESS,
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/* The following two are not fully implemented.
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They are used in emitting insns, but they aren't distinguished from
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RELOAD_OTHER when computing the number of spills. What they accomplish
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is to avoid precluding inheritance of already loaded values
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for input reloads when there are also output reloads. */
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RELOAD_FOR_INPUT,
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RELOAD_FOR_OUTPUT,
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RELOAD_OTHER
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};
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extern enum reload_when_needed reload_when_needed[MAX_RELOADS];
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extern rtx *reg_equiv_constant;
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extern rtx *reg_equiv_address;
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extern rtx *reg_equiv_mem;
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/* All the "earlyclobber" operands of the current insn
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are recorded here. */
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extern int n_earlyclobbers;
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extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS];
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/* First uid used by insns created by reload in this function.
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Used in find_equiv_reg. */
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extern int reload_first_uid;
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/* Nonzero if indirect addressing is supported when the innermost MEM is
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of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to
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which these are valid is the same as spill_indirect_levels, above. */
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extern char indirect_symref_ok;
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/* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */
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extern char double_reg_address_ok;
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#ifdef MAX_INSN_CODE
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/* These arrays record the insn_code of insns that may be needed to
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perform input and output reloads of special objects. They provide a
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place to pass a scratch register. */
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extern enum insn_code reload_in_optab[];
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extern enum insn_code reload_out_optab[];
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#endif
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void init_reload ();
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void find_reloads ();
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void subst_reloads ();
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rtx eliminate_regs ();
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