gcc/regrename.h

   1 /* This file contains definitions for the register renamer.
   2    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_REGRENAME_H
  21 #define GCC_REGRENAME_H
  22
  23 /* We keep linked lists of DU_HEAD structures, each of which describes
  24    a chain of occurrences of a reg.  */
  25 struct du_head
  26 {
  27   /* The next chain.  */
  28   struct du_head *next_chain;
  29   /* The first and last elements of this chain.  */
  30   struct du_chain *first, *last;
  31   /* The chain that this chain is tied to.  */
  32   struct du_head *tied_chain;
  33   /* Describes the register being tracked.  */
  34   unsigned regno;
  35   int nregs;
  36
  37   /* A unique id to be used as an index into the conflicts bitmaps.  */
  38   unsigned id;
  39   /* A bitmap to record conflicts with other chains.  */
  40   bitmap_head conflicts;
  41   /* Conflicts with untracked hard registers.  */
  42   HARD_REG_SET hard_conflicts;
  43
  44   /* Nonzero if the chain crosses a call.  */
  45   unsigned int need_caller_save_reg:1;
  46   /* Nonzero if the register is used in a way that prevents renaming,
  47      such as the SET_DEST of a CALL_INSN or an asm operand that used
  48      to be a hard register.  */
  49   unsigned int cannot_rename:1;
  50   /* Nonzero if the chain has already been renamed.  */
  51   unsigned int renamed:1;
  52 };
  53
  54 typedef struct du_head *du_head_p;
  55
  56 /* This struct describes a single occurrence of a register.  */
  57 struct du_chain
  58 {
  59   /* Links to the next occurrence of the register.  */
  60   struct du_chain *next_use;
  61
  62   /* The insn where the register appears.  */
  63   rtx_insn *insn;
  64   /* The location inside the insn.  */
  65   rtx *loc;
  66   /* The register class required by the insn at this location.  */
  67   ENUM_BITFIELD(reg_class) cl : 16;
  68 };
  69
  70 /* This struct describes data gathered during regrename_analyze about
  71    a single operand of an insn.  */
  72 struct operand_rr_info
  73 {
  74   /* The number of chains recorded for this operand.  */
  75   int n_chains;
  76   /* Holds either the chain for the operand itself, or for the registers in
  77      a memory operand.  */
  78   struct du_chain *chains[MAX_REGS_PER_ADDRESS];
  79   struct du_head *heads[MAX_REGS_PER_ADDRESS];
  80 };
  81
  82 /* A struct to hold a vector of operand_rr_info structures describing the
  83    operands of an insn.  */
  84 struct insn_rr_info
  85 {
  86   operand_rr_info *op_info;
  87 };
  88
  89
  90 extern vec<insn_rr_info> insn_rr;
  91
  92 extern void regrename_init (bool);
  93 extern void regrename_finish (void);
  94 extern void regrename_analyze (bitmap);
  95 extern du_head_p regrename_chain_from_id (unsigned int);
  96 extern int find_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int,
  97                             bool);
  98 extern bool regrename_do_replace (du_head_p, int);
  99
 100 #endif