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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [regrename.h] - Rev 748
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/* This file contains definitions for the register renamer. Copyright (C) 2011 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; DEF_VEC_P (du_head_p); DEF_VEC_ALLOC_P (du_head_p, heap); /* 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; DEF_VEC_O (insn_rr_info); DEF_VEC_ALLOC_O (insn_rr_info, heap); extern VEC(insn_rr_info, heap) *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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