-/* Communication between reload.c and reload1.c.
- Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
- 1999, 2000, 2001 Free Software Foundation, Inc.
+/* Communication between reload.c, reload1.c and the rest of compiler.
+ Copyright (C) 1987-2015 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+#ifndef GCC_RELOAD_H
+#define GCC_RELOAD_H
/* If secondary reloads are the same for inputs and outputs, define those
macros here. */
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
-
-/* If MEMORY_MOVE_COST isn't defined, give it a default here. */
-#ifndef MEMORY_MOVE_COST
-#ifdef HAVE_SECONDARY_RELOADS
-#define MEMORY_MOVE_COST(MODE,CLASS,IN) \
- (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN)))
-#else
-#define MEMORY_MOVE_COST(MODE,CLASS,IN) 4
-#endif
-#endif
-extern int memory_move_secondary_cost PARAMS ((enum machine_mode, enum reg_class, int));
+extern int register_move_cost (machine_mode, reg_class_t, reg_class_t);
+extern int memory_move_cost (machine_mode, reg_class_t, bool);
+extern int memory_move_secondary_cost (machine_mode, reg_class_t, bool);
/* Maximum number of reloads we can need. */
#define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1))
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.
+ 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, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN,
RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_INPADDR_ADDRESS,
RELOAD_FOR_OUTPUT_ADDRESS, RELOAD_FOR_OUTADDR_ADDRESS,
RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR,
rtx out;
/* The class of registers to reload into. */
- enum reg_class class;
+ enum reg_class rclass;
/* The mode this operand should have when reloaded, on input. */
- enum machine_mode inmode;
+ machine_mode inmode;
/* The mode this operand should have when reloaded, on output. */
- enum machine_mode outmode;
+ machine_mode outmode;
/* The mode of the reload register. */
- enum machine_mode mode;
+ machine_mode mode;
/* the largest number of registers this reload will require. */
unsigned int nregs;
addressing an output, for addressing a non-reloaded mem ref, or for
unspecified purposes (i.e., more than one of the above). */
enum reload_type when_needed;
-
+
/* Nonzero for an optional reload. Optional reloads are ignored unless the
value is already sitting in a register. */
unsigned int optional:1;
extern int n_reloads;
#endif
-extern rtx *reg_equiv_constant;
-extern rtx *reg_equiv_memory_loc;
-extern rtx *reg_equiv_address;
-extern rtx *reg_equiv_mem;
+/* Target-dependent globals. */
+struct target_reload {
+ /* 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. */
+ bool x_indirect_symref_ok;
+
+ /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */
+ bool x_double_reg_address_ok;
+
+ /* Nonzero if indirect addressing is supported on the machine; this means
+ that spilling (REG n) does not require reloading it into a register in
+ order to do (MEM (REG n)) or (MEM (PLUS (REG n) (CONST_INT c))). The
+ value indicates the level of indirect addressing supported, e.g., two
+ means that (MEM (MEM (REG n))) is also valid if (REG n) does not get
+ a hard register. */
+ unsigned char x_spill_indirect_levels;
+
+ /* True if caller-save has been reinitialized. */
+ bool x_caller_save_initialized_p;
+
+ /* Modes for each hard register that we can save. The smallest mode is wide
+ enough to save the entire contents of the register. When saving the
+ register because it is live we first try to save in multi-register modes.
+ If that is not possible the save is done one register at a time. */
+ machine_mode (x_regno_save_mode
+ [FIRST_PSEUDO_REGISTER]
+ [MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]);
+
+ /* We will only make a register eligible for caller-save if it can be
+ saved in its widest mode with a simple SET insn as long as the memory
+ address is valid. We record the INSN_CODE is those insns here since
+ when we emit them, the addresses might not be valid, so they might not
+ be recognized. */
+ int x_cached_reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
+ int x_cached_reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
+};
+
+extern struct target_reload default_target_reload;
+#if SWITCHABLE_TARGET
+extern struct target_reload *this_target_reload;
+#else
+#define this_target_reload (&default_target_reload)
+#endif
+
+#define indirect_symref_ok \
+ (this_target_reload->x_indirect_symref_ok)
+#define double_reg_address_ok \
+ (this_target_reload->x_double_reg_address_ok)
+#define caller_save_initialized_p \
+ (this_target_reload->x_caller_save_initialized_p)
+
+/* Register equivalences. Indexed by register number. */
+struct reg_equivs_t
+{
+ /* The constant value to which pseudo reg N is equivalent,
+ or zero if pseudo reg N is not equivalent to a constant.
+ find_reloads looks at this in order to replace pseudo reg N
+ with the constant it stands for. */
+ rtx constant;
+
+ /* An invariant value to which pseudo reg N is equivalent.
+ eliminate_regs_in_insn uses this to replace pseudos in particular
+ contexts. */
+ rtx invariant;
+
+ /* A memory location to which pseudo reg N is equivalent,
+ prior to any register elimination (such as frame pointer to stack
+ pointer). Depending on whether or not it is a valid address, this value
+ is transferred to either equiv_address or equiv_mem. */
+ rtx memory_loc;
+
+ /* The address of stack slot to which pseudo reg N is equivalent.
+ This is used when the address is not valid as a memory address
+ (because its displacement is too big for the machine.) */
+ rtx address;
+
+ /* The memory slot to which pseudo reg N is equivalent,
+ or zero if pseudo reg N is not equivalent to a memory slot. */
+ rtx mem;
+
+ /* An EXPR_LIST of REG_EQUIVs containing MEMs with
+ alternate representations of the location of pseudo reg N. */
+ rtx_expr_list *alt_mem_list;
+
+ /* The list of insns that initialized reg N from its equivalent
+ constant or memory slot. */
+ rtx_insn_list *init;
+};
+
+#define reg_equiv_constant(ELT) \
+ (*reg_equivs)[(ELT)].constant
+#define reg_equiv_invariant(ELT) \
+ (*reg_equivs)[(ELT)].invariant
+#define reg_equiv_memory_loc(ELT) \
+ (*reg_equivs)[(ELT)].memory_loc
+#define reg_equiv_address(ELT) \
+ (*reg_equivs)[(ELT)].address
+#define reg_equiv_mem(ELT) \
+ (*reg_equivs)[(ELT)].mem
+#define reg_equiv_alt_mem_list(ELT) \
+ (*reg_equivs)[(ELT)].alt_mem_list
+#define reg_equiv_init(ELT) \
+ (*reg_equivs)[(ELT)].init
+
+extern vec<reg_equivs_t, va_gc> *reg_equivs;
/* All the "earlyclobber" operands of the current insn
are recorded here. */
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;
-
extern int num_not_at_initial_offset;
-struct needs
-{
- /* [0] is normal, [1] is nongroup. */
- short regs[2][N_REG_CLASSES];
- short groups[N_REG_CLASSES];
-};
-
#if defined SET_HARD_REG_BIT && defined CLEAR_REG_SET
/* This structure describes instructions which are relevant for reload.
Apart from all regular insns, this also includes CODE_LABELs, since they
must be examined for register elimination. */
-struct insn_chain
+struct insn_chain
{
- /* Links to the neighbour instructions. */
+ /* Links to the neighbor instructions. */
struct insn_chain *next, *prev;
/* Link through a chains set up by calculate_needs_all_insns, containing
all insns that need reloading. */
struct insn_chain *next_need_reload;
- /* The basic block this insn is in. */
- int block;
/* The rtx of the insn. */
- rtx insn;
- /* Register life information: record all live hard registers, and all
- live pseudos that have a hard register. */
- regset_head live_throughout;
- regset_head dead_or_set;
+ rtx_insn *insn;
- /* Copies of the global variables computed by find_reloads. */
- struct reload *rld;
- int n_reloads;
-
- /* Indicates which registers have already been used for spills. */
- HARD_REG_SET used_spill_regs;
-
- /* Describe the needs for reload registers of this insn. */
- struct needs need;
+ /* The basic block this insn is in. */
+ int block;
/* Nonzero if find_reloads said the insn requires reloading. */
unsigned int need_reload:1;
unsigned int need_elim:1;
/* Nonzero if this insn was inserted by perform_caller_saves. */
unsigned int is_caller_save_insn:1;
+
+ /* Register life information: record all live hard registers, and
+ all live pseudos that have a hard register. This set also
+ contains pseudos spilled by IRA. */
+ bitmap_head live_throughout;
+ bitmap_head dead_or_set;
+
+ /* Copies of the global variables computed by find_reloads. */
+ struct reload *rld;
+ int n_reloads;
+
+ /* Indicates which registers have already been used for spills. */
+ HARD_REG_SET used_spill_regs;
};
/* A chain of insn_chain structures to describe all non-note insns in
extern struct insn_chain *reload_insn_chain;
/* Allocate a new insn_chain structure. */
-extern struct insn_chain *new_insn_chain PARAMS ((void));
+extern struct insn_chain *new_insn_chain (void);
+#endif
-extern void compute_use_by_pseudos PARAMS ((HARD_REG_SET *, regset));
+#if defined SET_HARD_REG_BIT
+extern void compute_use_by_pseudos (HARD_REG_SET *, bitmap);
#endif
/* Functions from reload.c: */
-/* Return a memory location that will be used to copy X in mode MODE.
+extern reg_class_t secondary_reload_class (bool, reg_class_t,
+ machine_mode, rtx);
+
+#ifdef GCC_INSN_CODES_H
+extern enum reg_class scratch_reload_class (enum insn_code);
+#endif
+
+/* 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 PARAMS ((rtx, enum machine_mode,
- int, enum reload_type));
+extern rtx get_secondary_mem (rtx, machine_mode, int, enum reload_type);
/* Clear any secondary memory locations we've made. */
-extern void clear_secondary_mem PARAMS ((void));
+extern void clear_secondary_mem (void);
/* Transfer all replacements that used to be in reload FROM to be in
reload TO. */
-extern void transfer_replacements PARAMS ((int, int));
+extern void transfer_replacements (int, int);
/* IN_RTX is the value loaded by a reload that we now decided to inherit,
or a subpart of it. If we have any replacements registered for IN_RTX,
- chancel the reloads that were supposed to load them.
- Return non-zero if we chanceled any reloads. */
-extern int remove_address_replacements PARAMS ((rtx in_rtx));
+ cancel the reloads that were supposed to load them.
+ Return nonzero if we canceled any reloads. */
+extern int remove_address_replacements (rtx in_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 PARAMS ((rtx, rtx));
+extern int operands_match_p (rtx, rtx);
-/* Return 1 if altering OP will not modify the value of CLOBBER. */
-extern int safe_from_earlyclobber PARAMS ((rtx, rtx));
+/* Return 1 if altering OP will not modify the value of CLOBBER. */
+extern int safe_from_earlyclobber (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 int find_reloads PARAMS ((rtx, int, int, int, short *));
+extern int find_reloads (rtx_insn *, 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 PARAMS ((rtx, rtx));
+extern rtx form_sum (machine_mode, rtx, rtx);
/* Substitute into the current INSN the registers into which we have reloaded
the things that need reloading. */
-extern void subst_reloads PARAMS ((rtx));
+extern void subst_reloads (rtx_insn *);
/* 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 PARAMS ((rtx, rtx));
+extern void copy_replacements (rtx, rtx);
/* Change any replacements being done to *X to be done to *Y */
-extern void move_replacements PARAMS ((rtx *x, rtx *y));
+extern void move_replacements (rtx *x, rtx *y);
/* If LOC was scheduled to be replaced by something, return the replacement.
Otherwise, return *LOC. */
-extern rtx find_replacement PARAMS ((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 PARAMS ((unsigned int, unsigned int,
- rtx, rtx *));
+extern rtx find_replacement (rtx *);
/* Nonzero if modifying X will affect IN. */
-extern int reg_overlap_mentioned_for_reload_p PARAMS ((rtx, rtx));
-
-/* Return nonzero if anything in X contains a MEM. Look also for pseudo
- registers. */
-extern int refers_to_mem_for_reload_p PARAMS ((rtx));
+extern int reg_overlap_mentioned_for_reload_p (rtx, 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 PARAMS ((rtx, rtx, enum reg_class, int, short *,
- int, enum machine_mode));
+extern rtx find_equiv_reg (rtx, rtx_insn *, enum reg_class, int, short *,
+ int, machine_mode);
/* Return 1 if register REGNO is the subject of a clobber in insn INSN. */
-extern int regno_clobbered_p PARAMS ((unsigned int, rtx, enum machine_mode,
- int));
+extern int regno_clobbered_p (unsigned int, rtx_insn *, machine_mode, int);
/* Return 1 if X is an operand of an insn that is being earlyclobbered. */
-extern int earlyclobber_operand_p PARAMS ((rtx));
+extern int earlyclobber_operand_p (rtx);
/* Record one reload that needs to be performed. */
-extern int push_reload PARAMS ((rtx, rtx, rtx *, rtx *, enum reg_class,
- enum machine_mode, enum machine_mode,
- int, int, int, enum reload_type));
+extern int push_reload (rtx, rtx, rtx *, rtx *, enum reg_class,
+ machine_mode, machine_mode,
+ int, int, int, enum reload_type);
/* Functions in reload1.c: */
-extern void reload_cse_regs PARAMS ((rtx));
-extern int reloads_conflict PARAMS ((int, int));
-
/* Initialize the reload pass once per compilation. */
-extern void init_reload PARAMS ((void));
+extern void init_reload (void);
/* The reload pass itself. */
-extern int reload PARAMS ((rtx, int));
+extern bool reload (rtx_insn *, int);
/* Mark the slots in regs_ever_live for the hard regs
used by pseudo-reg number REGNO. */
-extern void mark_home_live PARAMS ((int));
+extern void mark_home_live (int);
/* Scan X and replace any eliminable registers (such as fp) with a
replacement (such as sp), plus an offset. */
-extern rtx eliminate_regs PARAMS ((rtx, enum machine_mode, rtx));
+extern rtx eliminate_regs (rtx, machine_mode, rtx);
+extern bool elimination_target_reg_p (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 PARAMS ((rtx, rtx, int, enum reload_type));
+/* Called from the register allocator to estimate costs of eliminating
+ invariant registers. */
+extern void calculate_elim_costs_all_insns (void);
/* Deallocate the reload register used by reload number R. */
-extern void deallocate_reload_reg PARAMS ((int r));
+extern void deallocate_reload_reg (int r);
/* Functions in caller-save.c: */
/* Initialize for caller-save. */
-extern void init_caller_save PARAMS ((void));
+extern void init_caller_save (void);
/* Initialize save areas by showing that we haven't allocated any yet. */
-extern void init_save_areas PARAMS ((void));
+extern void init_save_areas (void);
/* Allocate save areas for any hard registers that might need saving. */
-extern void setup_save_areas PARAMS ((void));
+extern void setup_save_areas (void);
/* Find the places where hard regs are live across calls and save them. */
-extern void save_call_clobbered_regs PARAMS ((void));
+extern void save_call_clobbered_regs (void);
/* Replace (subreg (reg)) with the appropriate (reg) for any operands. */
-extern void cleanup_subreg_operands PARAMS ((rtx));
+extern void cleanup_subreg_operands (rtx_insn *);
/* Debugging support. */
-extern void debug_reload_to_stream PARAMS ((FILE *));
-extern void debug_reload PARAMS ((void));
+extern void debug_reload_to_stream (FILE *);
+extern void debug_reload (void);
+
+/* Compute the actual register we should reload to, in case we're
+ reloading to/from a register that is wider than a word. */
+extern rtx reload_adjust_reg_for_mode (rtx, machine_mode);
+
+/* Allocate or grow the reg_equiv tables, initializing new entries to 0. */
+extern void grow_reg_equivs (void);
+
+#endif /* GCC_RELOAD_H */