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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [regrename.h] - Blame information for rev 720

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1 684 jeremybenn
/* This file contains definitions for the register renamer.
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   Copyright (C) 2011
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   Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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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 GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_REGRENAME_H
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#define GCC_REGRENAME_H
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/* We keep linked lists of DU_HEAD structures, each of which describes
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   a chain of occurrences of a reg.  */
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struct du_head
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{
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  /* The next chain.  */
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  struct du_head *next_chain;
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  /* The first and last elements of this chain.  */
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  struct du_chain *first, *last;
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  /* Describes the register being tracked.  */
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  unsigned regno;
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  int nregs;
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  /* A unique id to be used as an index into the conflicts bitmaps.  */
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  unsigned id;
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  /* A bitmap to record conflicts with other chains.  */
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  bitmap_head conflicts;
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  /* Conflicts with untracked hard registers.  */
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  HARD_REG_SET hard_conflicts;
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  /* Nonzero if the chain crosses a call.  */
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  unsigned int need_caller_save_reg:1;
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  /* Nonzero if the register is used in a way that prevents renaming,
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     such as the SET_DEST of a CALL_INSN or an asm operand that used
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     to be a hard register.  */
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  unsigned int cannot_rename:1;
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};
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typedef struct du_head *du_head_p;
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DEF_VEC_P (du_head_p);
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DEF_VEC_ALLOC_P (du_head_p, heap);
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/* This struct describes a single occurrence of a register.  */
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struct du_chain
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{
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  /* Links to the next occurrence of the register.  */
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  struct du_chain *next_use;
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  /* The insn where the register appears.  */
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  rtx insn;
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  /* The location inside the insn.  */
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  rtx *loc;
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  /* The register class required by the insn at this location.  */
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  ENUM_BITFIELD(reg_class) cl : 16;
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};
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/* This struct describes data gathered during regrename_analyze about
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   a single operand of an insn.  */
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typedef struct
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{
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  /* The number of chains recorded for this operand.  */
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  int n_chains;
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  /* Holds either the chain for the operand itself, or for the registers in
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     a memory operand.  */
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  struct du_chain *chains[MAX_REGS_PER_ADDRESS];
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  struct du_head *heads[MAX_REGS_PER_ADDRESS];
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} operand_rr_info;
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/* A struct to hold a vector of operand_rr_info structures describing the
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   operands of an insn.  */
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typedef struct
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{
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  operand_rr_info *op_info;
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} insn_rr_info;
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DEF_VEC_O (insn_rr_info);
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DEF_VEC_ALLOC_O (insn_rr_info, heap);
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extern VEC(insn_rr_info, heap) *insn_rr;
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extern void regrename_init (bool);
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extern void regrename_finish (void);
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extern void regrename_analyze (bitmap);
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extern du_head_p regrename_chain_from_id (unsigned int);
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extern int find_best_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *,
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                                 int);
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extern void regrename_do_replace (du_head_p, int);
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#endif

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