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/* This file contains definitions for the register renamer.
Copyright (C) 2011-2013 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_REGRENAME_H
#define GCC_REGRENAME_H
/* We keep linked lists of DU_HEAD structures, each of which describes
a chain of occurrences of a reg. */
struct du_head
{
/* The next chain. */
struct du_head *next_chain;
/* The first and last elements of this chain. */
struct du_chain *first, *last;
/* Describes the register being tracked. */
unsigned regno;
int nregs;
/* A unique id to be used as an index into the conflicts bitmaps. */
unsigned id;
/* A bitmap to record conflicts with other chains. */
bitmap_head conflicts;
/* Conflicts with untracked hard registers. */
HARD_REG_SET hard_conflicts;
/* Nonzero if the chain crosses a call. */
unsigned int need_caller_save_reg:1;
/* Nonzero if the register is used in a way that prevents renaming,
such as the SET_DEST of a CALL_INSN or an asm operand that used
to be a hard register. */
unsigned int cannot_rename:1;
};
typedef struct du_head *du_head_p;
/* This struct describes a single occurrence of a register. */
struct du_chain
{
/* Links to the next occurrence of the register. */
struct du_chain *next_use;
/* The insn where the register appears. */
rtx insn;
/* The location inside the insn. */
rtx *loc;
/* The register class required by the insn at this location. */
ENUM_BITFIELD(reg_class) cl : 16;
};
/* This struct describes data gathered during regrename_analyze about
a single operand of an insn. */
typedef struct
{
/* The number of chains recorded for this operand. */
int n_chains;
/* Holds either the chain for the operand itself, or for the registers in
a memory operand. */
struct du_chain *chains[MAX_REGS_PER_ADDRESS];
struct du_head *heads[MAX_REGS_PER_ADDRESS];
} operand_rr_info;
/* A struct to hold a vector of operand_rr_info structures describing the
operands of an insn. */
typedef struct
{
operand_rr_info *op_info;
} insn_rr_info;
extern vec<insn_rr_info> insn_rr;
extern void regrename_init (bool);
extern void regrename_finish (void);
extern void regrename_analyze (bitmap);
extern du_head_p regrename_chain_from_id (unsigned int);
extern int find_best_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *,
int);
extern void regrename_do_replace (du_head_p, int);
#endif
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