/* Communication between reload.c and reload1.c.
- Copyright (C) 1987, 1991 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1991, 1992, 1993 Free Software Foundation, Inc.
This file is part of GNU CC.
#endif
#endif
+#ifndef STDIO_PROTO
+#ifdef BUFSIZ
+#define STDIO_PROTO(ARGS) PROTO(ARGS)
+#else
+#define STDIO_PROTO(ARGS) ()
+#endif
+#endif
+
/* If secondary reloads are the same for inputs and outputs, define those
macros here. */
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_strict_low[MAX_RELOADS];
extern char reload_optional[MAX_RELOADS];
extern int reload_inc[MAX_RELOADS];
-extern int reload_needed_for_multiple[MAX_RELOADS];
-extern rtx reload_needed_for[MAX_RELOADS];
+extern int reload_opnum[MAX_RELOADS];
extern int reload_secondary_reload[MAX_RELOADS];
extern int reload_secondary_p[MAX_RELOADS];
#ifdef MAX_INSN_CODE
extern rtx reload_reg_rtx[MAX_RELOADS];
-enum reload_when_needed
+/* 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_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_ADDRESS,
- RELOAD_FOR_OUTPUT_RELOAD_ADDRESS,
- RELOAD_FOR_OPERAND_ADDRESS,
- /* The following two are not fully implemented.
- They are used in emitting insns, but they aren't distinguished from
- RELOAD_OTHER when computing the number of spills. What they accomplish
- is to avoid precluding inheritance of already loaded values
- for input reloads when there are also output reloads. */
- RELOAD_FOR_INPUT,
- RELOAD_FOR_OUTPUT,
- RELOAD_OTHER
+ RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN,
+ RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_OUTPUT_ADDRESS,
+ RELOAD_FOR_OPERAND_ADDRESS, RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS
};
-extern enum reload_when_needed reload_when_needed[MAX_RELOADS];
+extern enum reload_type reload_when_needed[MAX_RELOADS];
extern rtx *reg_equiv_constant;
extern rtx *reg_equiv_memory_loc;
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;
extern enum insn_code reload_out_optab[];
#endif
-extern void init_reload PROTO((void));
+/* 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));
-extern rtx get_secondary_mem PROTO((rtx, enum machine_mode));
-extern rtx eliminate_regs PROTO((rtx, enum machine_mode, rtx));
-extern rtx gen_input_reload PROTO((rtx, rtx, 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));
+
+/* 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 an input reload of IN to RELOADREG. IN is from
+ operand OPNUM with reload type TYPE. */
+extern rtx gen_input_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));
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