FSF GCC version 2.7.2

1 files changed, 237 insertions, 0 deletions

diff --git a/gnu/usr.bin/gcc/reload.h b/gnu/usr.bin/gcc/reload.h
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+/* 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, 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_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));