gcc/regrename.h

   1 /* This file contains definitions for the register renamer.
   2    Copyright (C) 2011-2021 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 class du_head
  26 {
  27 public:
  28   /* The next chain.  */
  29   class du_head *next_chain;
  30   /* The first and last elements of this chain.  */
  31   struct du_chain *first, *last;
  32   /* The chain that this chain is tied to.  */
  33   class du_head *tied_chain;
  34   /* Describes the register being tracked.  */
  35   unsigned regno;
  36   int nregs;
  37
  38   /* A unique id to be used as an index into the conflicts bitmaps.  */
  39   unsigned id;
  40   /* A bitmap to record conflicts with other chains.  */
  41   bitmap_head conflicts;
  42   /* Conflicts with untracked hard registers.  */
  43   HARD_REG_SET hard_conflicts;
  44   /* Which registers are fully or partially clobbered by the calls that
  45      the chain crosses.  */
  46   HARD_REG_SET call_clobber_mask;
  47
  48   /* A bitmask of ABIs used by the calls that the chain crosses.  */
  49   unsigned int call_abis : NUM_ABI_IDS;
  50   /* Nonzero if the register is used in a way that prevents renaming,
  51      such as the SET_DEST of a CALL_INSN or an asm operand that used
  52      to be a hard register.  */
  53   unsigned int cannot_rename:1;
  54   /* Nonzero if the chain has already been renamed.  */
  55   unsigned int renamed:1;
  56
  57   /* Fields for use by target code.  */
  58   unsigned int target_data_1;
  59   unsigned int target_data_2;
  60 };
  61
  62 typedef class du_head *du_head_p;
  63
  64 /* This struct describes a single occurrence of a register.  */
  65 struct du_chain
  66 {
  67   /* Links to the next occurrence of the register.  */
  68   struct du_chain *next_use;
  69
  70   /* The insn where the register appears.  */
  71   rtx_insn *insn;
  72   /* The location inside the insn.  */
  73   rtx *loc;
  74   /* The register class required by the insn at this location.  */
  75   ENUM_BITFIELD(reg_class) cl : 16;
  76 };
  77
  78 /* This struct describes data gathered during regrename_analyze about
  79    a single operand of an insn.  */
  80 struct operand_rr_info
  81 {
  82   /* The number of chains recorded for this operand.  */
  83   short n_chains;
  84   bool failed;
  85   /* Holds either the chain for the operand itself, or for the registers in
  86      a memory operand.  */
  87   struct du_chain *chains[MAX_REGS_PER_ADDRESS];
  88   class du_head *heads[MAX_REGS_PER_ADDRESS];
  89 };
  90
  91 /* A struct to hold a vector of operand_rr_info structures describing the
  92    operands of an insn.  */
  93 struct insn_rr_info
  94 {
  95   operand_rr_info *op_info;
  96 };
  97
  98
  99 extern vec<insn_rr_info> insn_rr;
 100
 101 extern void regrename_init (bool);
 102 extern void regrename_finish (void);
 103 extern void regrename_analyze (bitmap, bool = true);
 104 extern du_head_p regrename_chain_from_id (unsigned int);
 105 extern int find_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int,
 106                             bool);
 107 extern bool regrename_do_replace (du_head_p, int);
 108 extern reg_class regrename_find_superclass (du_head_p, int *,
 109                                             HARD_REG_SET *);
 110
 111 #endif