| /* This file contains definitions for the register renamer. |
| Copyright (C) 2011-2021 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. */ |
| class du_head |
| { |
| public: |
| /* The next chain. */ |
| class du_head *next_chain; |
| /* The first and last elements of this chain. */ |
| struct du_chain *first, *last; |
| /* The chain that this chain is tied to. */ |
| class du_head *tied_chain; |
| /* 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; |
| /* Which registers are fully or partially clobbered by the calls that |
| the chain crosses. */ |
| HARD_REG_SET call_clobber_mask; |
| |
| /* A bitmask of ABIs used by the calls that the chain crosses. */ |
| unsigned int call_abis : NUM_ABI_IDS; |
| /* 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; |
| /* Nonzero if the chain has already been renamed. */ |
| unsigned int renamed:1; |
| |
| /* Fields for use by target code. */ |
| unsigned int target_data_1; |
| unsigned int target_data_2; |
| }; |
| |
| typedef class du_head *du_head_p; |
| |
| /* 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 *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. */ |
| struct operand_rr_info |
| { |
| /* The number of chains recorded for this operand. */ |
| short n_chains; |
| bool failed; |
| /* Holds either the chain for the operand itself, or for the registers in |
| a memory operand. */ |
| struct du_chain *chains[MAX_REGS_PER_ADDRESS]; |
| class du_head *heads[MAX_REGS_PER_ADDRESS]; |
| }; |
| |
| /* A struct to hold a vector of operand_rr_info structures describing the |
| operands of an insn. */ |
| struct insn_rr_info |
| { |
| operand_rr_info *op_info; |
| }; |
| |
| |
| extern vec<insn_rr_info> insn_rr; |
| |
| extern void regrename_init (bool); |
| extern void regrename_finish (void); |
| extern void regrename_analyze (bitmap, bool = true); |
| extern du_head_p regrename_chain_from_id (unsigned int); |
| extern int find_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int, |
| bool); |
| extern bool regrename_do_replace (du_head_p, int); |
| extern reg_class regrename_find_superclass (du_head_p, int *, |
| HARD_REG_SET *); |
| |
| #endif |