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337 lines
11 KiB
C
337 lines
11 KiB
C
/* Form lists of pseudo register references for autoinc optimization
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for GNU compiler. This is part of flow optimization.
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Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
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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 2, 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 COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#define DF_RD 1 /* Reaching definitions. */
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#define DF_RU 2 /* Reaching uses. */
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#define DF_LR 4 /* Live registers. */
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#define DF_DU_CHAIN 8 /* Def-use chain. */
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#define DF_UD_CHAIN 16 /* Use-def chain. */
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#define DF_REG_INFO 32 /* Register info. */
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#define DF_RD_CHAIN 64 /* Reg-def chain. */
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#define DF_RU_CHAIN 128 /* Reg-use chain. */
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#define DF_ALL 255
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#define DF_HARD_REGS 1024
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#define DF_EQUIV_NOTES 2048 /* Mark uses present in EQUIV/EQUAL notes. */
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enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
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DF_REF_REG_MEM_STORE};
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#define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
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/* ???> Perhaps all these data structures should be made private
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to enforce the interface. */
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/* Link on a def-use or use-def chain. */
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struct df_link
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{
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struct df_link *next;
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struct ref *ref;
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};
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enum df_ref_flags
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{
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DF_REF_READ_WRITE = 1
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};
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/* Define a register reference structure. */
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struct ref
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{
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rtx reg; /* The register referenced. */
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rtx insn; /* Insn containing ref. */
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rtx *loc; /* Loc is the location of the reg. */
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struct df_link *chain; /* Head of def-use or use-def chain. */
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enum df_ref_type type; /* Type of ref. */
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int id; /* Ref index. */
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enum df_ref_flags flags; /* Various flags. */
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};
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/* One of these structures is allocated for every insn. */
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struct insn_info
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{
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struct df_link *defs; /* Head of insn-def chain. */
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struct df_link *uses; /* Head of insn-use chain. */
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/* ???? The following luid field should be considerd private so that
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we can change it on the fly to accommodate new insns? */
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int luid; /* Logical UID. */
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#if 0
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rtx insn; /* Backpointer to the insn. */
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#endif
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};
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/* One of these structures is allocated for every reg. */
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struct reg_info
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{
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struct df_link *defs; /* Head of reg-def chain. */
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struct df_link *uses; /* Head of reg-use chain. */
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int lifetime;
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int n_defs;
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int n_uses;
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};
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/* One of these structures is allocated for every basic block. */
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struct bb_info
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{
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/* Reaching def bitmaps have def_id elements. */
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bitmap rd_kill;
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bitmap rd_gen;
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bitmap rd_in;
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bitmap rd_out;
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/* Reaching use bitmaps have use_id elements. */
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bitmap ru_kill;
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bitmap ru_gen;
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bitmap ru_in;
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bitmap ru_out;
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/* Live variable bitmaps have n_regs elements. */
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bitmap lr_def;
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bitmap lr_use;
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bitmap lr_in;
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bitmap lr_out;
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int rd_valid;
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int ru_valid;
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int lr_valid;
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};
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struct df
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{
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int flags; /* Indicates what's recorded. */
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struct bb_info *bbs; /* Basic block table. */
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struct ref **defs; /* Def table, indexed by def_id. */
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struct ref **uses; /* Use table, indexed by use_id. */
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struct ref **reg_def_last; /* Indexed by regno. */
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struct reg_info *regs; /* Regs table, index by regno. */
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unsigned int reg_size; /* Size of regs table. */
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struct insn_info *insns; /* Insn table, indexed by insn UID. */
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unsigned int insn_size; /* Size of insn table. */
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unsigned int def_id; /* Next def ID. */
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unsigned int def_size; /* Size of def table. */
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unsigned int n_defs; /* Size of def bitmaps. */
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unsigned int use_id; /* Next use ID. */
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unsigned int use_size; /* Size of use table. */
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unsigned int n_uses; /* Size of use bitmaps. */
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unsigned int n_bbs; /* Number of basic blocks. */
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unsigned int n_regs; /* Number of regs. */
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unsigned int def_id_save; /* Saved next def ID. */
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unsigned int use_id_save; /* Saved next use ID. */
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bitmap insns_modified; /* Insns that (may) have changed. */
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bitmap bbs_modified; /* Blocks that (may) have changed. */
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bitmap all_blocks; /* All blocks in CFG. */
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/* The sbitmap vector of dominators or NULL if not computed.
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Ideally, this should be a pointer to a CFG object. */
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sbitmap *dom;
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int * dfs_order; /* DFS order -> block number */
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int * rc_order; /* reverse completion order -> block number */
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int * rts_order; /* reverse top sort order -> block number */
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int * inverse_rc_map; /* block number -> reverse completion order */
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int * inverse_dfs_map; /* block number -> DFS order */
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int * inverse_rts_map; /* block number -> reverse top-sort order */
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};
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struct df_map
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{
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rtx old;
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rtx new;
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};
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#define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
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/* Macros to access the elements within the ref structure. */
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#define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
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? SUBREG_REG ((REF)->reg) : ((REF)->reg))
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#define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
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#define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
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? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
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#ifdef OLD_DF_INTERFACE
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#define DF_REF_REG(REF) DF_REF_REAL_REG(REF)
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#define DF_REF_LOC(REF) DF_REF_REAL_LOC(REF)
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#else
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#define DF_REF_REG(REF) ((REF)->reg)
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#define DF_REF_LOC(REF) ((REF)->loc)
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#endif
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#define DF_REF_BB(REF) (BLOCK_FOR_INSN ((REF)->insn))
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#define DF_REF_BBNO(REF) (BLOCK_FOR_INSN ((REF)->insn)->index)
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#define DF_REF_INSN(REF) ((REF)->insn)
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#define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
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#define DF_REF_TYPE(REF) ((REF)->type)
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#define DF_REF_CHAIN(REF) ((REF)->chain)
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#define DF_REF_ID(REF) ((REF)->id)
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#define DF_REF_FLAGS(REF) ((REF)->flags)
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/* Macros to determine the reference type. */
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#define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
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#define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
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#define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
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#define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
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#define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
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|| DF_REF_REG_MEM_LOAD_P (REF))
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/* Macros to access the elements within the reg_info structure table. */
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#define DF_REGNO_FIRST_DEF(DF, REGNUM) \
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((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
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#define DF_REGNO_LAST_USE(DF, REGNUM) \
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((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
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#define DF_REGNO_FIRST_BB(DF, REGNUM) \
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(DF_REGNO_FIRST_DEF (DF, REGNUM) \
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? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
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#define DF_REGNO_LAST_BB(DF, REGNUM) \
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(DF_REGNO_LAST_USE (DF, REGNUM) \
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? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
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/* Macros to access the elements within the insn_info structure table. */
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#define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
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#define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
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#define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
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/* Functions to build and analyse dataflow information. */
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extern struct df *df_init PARAMS ((void));
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extern int df_analyse PARAMS ((struct df *, bitmap, int));
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extern void df_finish PARAMS ((struct df *));
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extern void df_dump PARAMS ((struct df *, int, FILE *));
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/* Functions to modify insns. */
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extern void df_insn_modify PARAMS ((struct df *, basic_block, rtx));
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extern rtx df_insn_delete PARAMS ((struct df *, basic_block, rtx));
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extern rtx df_pattern_emit_before PARAMS ((struct df *, rtx,
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basic_block, rtx));
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extern rtx df_jump_pattern_emit_after PARAMS ((struct df *, rtx,
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basic_block, rtx));
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extern rtx df_pattern_emit_after PARAMS ((struct df *, rtx,
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basic_block, rtx));
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extern rtx df_insn_move_before PARAMS ((struct df *, basic_block, rtx,
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basic_block, rtx));
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extern int df_reg_replace PARAMS ((struct df *, bitmap, rtx, rtx));
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extern int df_ref_reg_replace PARAMS ((struct df *, struct ref *, rtx, rtx));
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extern int df_ref_remove PARAMS ((struct df *, struct ref *));
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extern int df_insn_reg_replace PARAMS ((struct df *, basic_block,
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rtx, rtx, rtx));
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extern int df_insn_mem_replace PARAMS ((struct df *, basic_block,
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rtx, rtx, rtx));
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extern struct ref *df_bb_def_use_swap PARAMS ((struct df *, basic_block,
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rtx, rtx, unsigned int));
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/* Functions to query dataflow information. */
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extern basic_block df_regno_bb PARAMS((struct df *, unsigned int));
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extern int df_reg_lifetime PARAMS ((struct df *, rtx));
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extern int df_reg_global_p PARAMS ((struct df *, rtx));
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extern int df_insn_regno_def_p PARAMS ((struct df *,
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basic_block, rtx, unsigned int));
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extern int df_insn_dominates_all_uses_p PARAMS ((struct df *,
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basic_block, rtx));
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extern int df_insn_dominates_uses_p PARAMS ((struct df *, basic_block,
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rtx, bitmap));
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extern int df_bb_reg_live_start_p PARAMS ((struct df *, basic_block, rtx));
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extern int df_bb_reg_live_end_p PARAMS ((struct df *, basic_block, rtx));
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extern int df_bb_regs_lives_compare PARAMS ((struct df *, basic_block,
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rtx, rtx));
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extern rtx df_bb_single_def_use_insn_find PARAMS((struct df *, basic_block,
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rtx, rtx));
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/* Functions for debugging from GDB. */
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extern void debug_df_insn PARAMS ((rtx));
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extern void debug_df_regno PARAMS ((unsigned int));
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extern void debug_df_reg PARAMS ((rtx));
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extern void debug_df_defno PARAMS ((unsigned int));
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extern void debug_df_useno PARAMS ((unsigned int));
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extern void debug_df_ref PARAMS ((struct ref *));
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extern void debug_df_chain PARAMS ((struct df_link *));
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extern void df_insn_debug PARAMS ((struct df *, rtx, FILE *));
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extern void df_insn_debug_regno PARAMS ((struct df *, rtx, FILE *));
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/* Meet over any path (UNION) or meet over all paths (INTERSECTION) */
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enum df_confluence_op
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{
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UNION,
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INTERSECTION
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};
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/* Dataflow direction */
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enum df_flow_dir
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{
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FORWARD,
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BACKWARD
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};
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typedef void (*transfer_function_sbitmap) PARAMS ((int, int *, sbitmap, sbitmap,
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sbitmap, sbitmap, void *));
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typedef void (*transfer_function_bitmap) PARAMS ((int, int *, bitmap, bitmap,
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bitmap, bitmap, void *));
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extern void iterative_dataflow_sbitmap PARAMS ((sbitmap *, sbitmap *,
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sbitmap *, sbitmap *,
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bitmap, enum df_flow_dir,
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enum df_confluence_op,
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transfer_function_sbitmap,
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int *, void *));
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extern void iterative_dataflow_bitmap PARAMS ((bitmap *, bitmap *, bitmap *,
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bitmap *, bitmap,
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enum df_flow_dir,
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enum df_confluence_op,
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transfer_function_bitmap,
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int *, void *));
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