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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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