352 lines
11 KiB
C
352 lines
11 KiB
C
/* Form lists of pseudo register references for autoinc optimization
|
|
for GNU compiler. This is part of flow optimization.
|
|
Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
|
|
Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
|
|
|
|
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 2, 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 COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
02111-1307, USA. */
|
|
|
|
#define DF_RD 1 /* Reaching definitions. */
|
|
#define DF_RU 2 /* Reaching uses. */
|
|
#define DF_LR 4 /* Live registers. */
|
|
#define DF_DU_CHAIN 8 /* Def-use chain. */
|
|
#define DF_UD_CHAIN 16 /* Use-def chain. */
|
|
#define DF_REG_INFO 32 /* Register info. */
|
|
#define DF_RD_CHAIN 64 /* Reg-def chain. */
|
|
#define DF_RU_CHAIN 128 /* Reg-use chain. */
|
|
#define DF_ALL 255
|
|
#define DF_HARD_REGS 1024 /* Mark hard registers. */
|
|
#define DF_EQUIV_NOTES 2048 /* Mark uses present in EQUIV/EQUAL notes. */
|
|
#define DF_FOR_REGALLOC 4096 /* If called for the register allocator. */
|
|
|
|
enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
|
|
DF_REF_REG_MEM_STORE};
|
|
|
|
#define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
|
|
|
|
/* Link on a def-use or use-def chain. */
|
|
struct df_link
|
|
{
|
|
struct df_link *next;
|
|
struct ref *ref;
|
|
};
|
|
|
|
enum df_ref_flags
|
|
{
|
|
/* Read-modify-write refs generate both a use and a def and
|
|
these are marked with this flag to show that they are not
|
|
independent. */
|
|
DF_REF_READ_WRITE = 1,
|
|
|
|
/* This flag is set on register references inside a subreg on
|
|
machines which have CANNOT_CHANGE_MODE_CLASS.
|
|
Note, that this flag can also be set on df_refs representing
|
|
the REG itself (i.e., one might not see the subreg anyore).
|
|
Also note, that this flag is set also for hardreg refs, i.e.,
|
|
you must check yourself if it's a pseudo. */
|
|
DF_REF_MODE_CHANGE = 2,
|
|
|
|
/* This flag is set, if we stripped the subreg from the reference.
|
|
In this case we must make conservative guesses, at what the
|
|
outer mode was. */
|
|
DF_REF_STRIPPED = 4,
|
|
|
|
/* This flag is set during register allocation if it's okay for
|
|
the reference's INSN to have one of its operands replaced with a
|
|
memory reference. */
|
|
DF_REF_MEM_OK = 8
|
|
};
|
|
|
|
|
|
/* Define a register reference structure. One of these is allocated
|
|
for every register reference (use or def). Note some register
|
|
references (e.g., post_inc, subreg) generate both a def and a use. */
|
|
struct ref
|
|
{
|
|
rtx reg; /* The register referenced. */
|
|
rtx insn; /* Insn containing ref. */
|
|
rtx *loc; /* The location of the reg. */
|
|
struct df_link *chain; /* Head of def-use or use-def chain. */
|
|
unsigned int id; /* Ref index. */
|
|
enum df_ref_type type; /* Type of ref. */
|
|
enum df_ref_flags flags; /* Various flags. */
|
|
};
|
|
|
|
|
|
/* One of these structures is allocated for every insn. */
|
|
struct insn_info
|
|
{
|
|
struct df_link *defs; /* Head of insn-def chain. */
|
|
struct df_link *uses; /* Head of insn-use chain. */
|
|
/* ???? The following luid field should be considered private so that
|
|
we can change it on the fly to accommodate new insns? */
|
|
int luid; /* Logical UID. */
|
|
};
|
|
|
|
|
|
/* One of these structures is allocated for every reg. */
|
|
struct reg_info
|
|
{
|
|
struct df_link *defs; /* Head of reg-def chain. */
|
|
struct df_link *uses; /* Head of reg-use chain. */
|
|
int lifetime;
|
|
int n_defs;
|
|
int n_uses;
|
|
};
|
|
|
|
|
|
/* One of these structures is allocated for every basic block. */
|
|
struct bb_info
|
|
{
|
|
/* Reaching def bitmaps have def_id elements. */
|
|
bitmap rd_kill;
|
|
bitmap rd_gen;
|
|
bitmap rd_in;
|
|
bitmap rd_out;
|
|
/* Reaching use bitmaps have use_id elements. */
|
|
bitmap ru_kill;
|
|
bitmap ru_gen;
|
|
bitmap ru_in;
|
|
bitmap ru_out;
|
|
/* Live variable bitmaps have n_regs elements. */
|
|
bitmap lr_def;
|
|
bitmap lr_use;
|
|
bitmap lr_in;
|
|
bitmap lr_out;
|
|
int rd_valid;
|
|
int ru_valid;
|
|
int lr_valid;
|
|
};
|
|
|
|
|
|
struct df
|
|
{
|
|
int flags; /* Indicates what's recorded. */
|
|
struct bb_info *bbs; /* Basic block table. */
|
|
struct ref **defs; /* Def table, indexed by def_id. */
|
|
struct ref **uses; /* Use table, indexed by use_id. */
|
|
struct ref **reg_def_last; /* Indexed by regno. */
|
|
struct reg_info *regs; /* Regs table, index by regno. */
|
|
unsigned int reg_size; /* Size of regs table. */
|
|
struct insn_info *insns; /* Insn table, indexed by insn UID. */
|
|
unsigned int insn_size; /* Size of insn table. */
|
|
unsigned int def_id; /* Next def ID. */
|
|
unsigned int def_size; /* Size of def table. */
|
|
unsigned int n_defs; /* Size of def bitmaps. */
|
|
unsigned int use_id; /* Next use ID. */
|
|
unsigned int use_size; /* Size of use table. */
|
|
unsigned int n_uses; /* Size of use bitmaps. */
|
|
unsigned int n_bbs; /* Number of basic blocks. */
|
|
unsigned int n_regs; /* Number of regs. */
|
|
unsigned int def_id_save; /* Saved next def ID. */
|
|
unsigned int use_id_save; /* Saved next use ID. */
|
|
bitmap insns_modified; /* Insns that (may) have changed. */
|
|
bitmap bbs_modified; /* Blocks that (may) have changed. */
|
|
bitmap all_blocks; /* All blocks in CFG. */
|
|
/* The sbitmap vector of dominators or NULL if not computed.
|
|
Ideally, this should be a pointer to a CFG object. */
|
|
sbitmap *dom;
|
|
int *dfs_order; /* DFS order -> block number. */
|
|
int *rc_order; /* Reverse completion order -> block number. */
|
|
int *rts_order; /* Reverse top sort order -> block number. */
|
|
int *inverse_rc_map; /* Block number -> reverse completion order. */
|
|
int *inverse_dfs_map; /* Block number -> DFS order. */
|
|
int *inverse_rts_map; /* Block number -> reverse top-sort order. */
|
|
};
|
|
|
|
|
|
struct df_map
|
|
{
|
|
rtx old;
|
|
rtx new;
|
|
};
|
|
|
|
|
|
#define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
|
|
|
|
|
|
/* Macros to access the elements within the ref structure. */
|
|
|
|
#define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
|
|
? SUBREG_REG ((REF)->reg) : ((REF)->reg))
|
|
#define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
|
|
#define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
|
|
? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
|
|
#define DF_REF_REG(REF) ((REF)->reg)
|
|
#define DF_REF_LOC(REF) ((REF)->loc)
|
|
#define DF_REF_BB(REF) (BLOCK_FOR_INSN ((REF)->insn))
|
|
#define DF_REF_BBNO(REF) (BLOCK_FOR_INSN ((REF)->insn)->index)
|
|
#define DF_REF_INSN(REF) ((REF)->insn)
|
|
#define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
|
|
#define DF_REF_TYPE(REF) ((REF)->type)
|
|
#define DF_REF_CHAIN(REF) ((REF)->chain)
|
|
#define DF_REF_ID(REF) ((REF)->id)
|
|
#define DF_REF_FLAGS(REF) ((REF)->flags)
|
|
|
|
/* Macros to determine the reference type. */
|
|
|
|
#define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
|
|
#define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
|
|
#define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
|
|
#define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
|
|
#define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
|
|
|| DF_REF_REG_MEM_LOAD_P (REF))
|
|
|
|
|
|
/* Macros to access the elements within the reg_info structure table. */
|
|
|
|
#define DF_REGNO_FIRST_DEF(DF, REGNUM) \
|
|
((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
|
|
#define DF_REGNO_LAST_USE(DF, REGNUM) \
|
|
((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
|
|
|
|
#define DF_REGNO_FIRST_BB(DF, REGNUM) \
|
|
(DF_REGNO_FIRST_DEF (DF, REGNUM) \
|
|
? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
|
|
#define DF_REGNO_LAST_BB(DF, REGNUM) \
|
|
(DF_REGNO_LAST_USE (DF, REGNUM) \
|
|
? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
|
|
|
|
|
|
/* Macros to access the elements within the insn_info structure table. */
|
|
|
|
#define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
|
|
#define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
|
|
#define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
|
|
|
|
|
|
/* Functions to build and analyse dataflow information. */
|
|
|
|
extern struct df *df_init (void);
|
|
|
|
extern int df_analyse (struct df *, bitmap, int);
|
|
|
|
extern void df_finish (struct df *);
|
|
|
|
extern void df_dump (struct df *, int, FILE *);
|
|
|
|
|
|
/* Functions to modify insns. */
|
|
|
|
extern void df_insn_modify (struct df *, basic_block, rtx);
|
|
|
|
extern rtx df_insn_delete (struct df *, basic_block, rtx);
|
|
|
|
extern rtx df_pattern_emit_before (struct df *, rtx, basic_block, rtx);
|
|
|
|
extern rtx df_jump_pattern_emit_after (struct df *, rtx, basic_block, rtx);
|
|
|
|
extern rtx df_pattern_emit_after (struct df *, rtx, basic_block, rtx);
|
|
|
|
extern rtx df_insn_move_before (struct df *, basic_block, rtx, basic_block,
|
|
rtx);
|
|
|
|
extern int df_reg_replace (struct df *, bitmap, rtx, rtx);
|
|
|
|
extern int df_ref_reg_replace (struct df *, struct ref *, rtx, rtx);
|
|
|
|
extern int df_ref_remove (struct df *, struct ref *);
|
|
|
|
extern int df_insn_reg_replace (struct df *, basic_block, rtx, rtx, rtx);
|
|
|
|
extern int df_insn_mem_replace (struct df *, basic_block, rtx, rtx, rtx);
|
|
|
|
extern struct ref *df_bb_def_use_swap (struct df *, basic_block, rtx, rtx,
|
|
unsigned int);
|
|
|
|
|
|
/* Functions to query dataflow information. */
|
|
|
|
extern basic_block df_regno_bb (struct df *, unsigned int);
|
|
|
|
extern int df_reg_lifetime (struct df *, rtx);
|
|
|
|
extern int df_reg_global_p (struct df *, rtx);
|
|
|
|
extern int df_insn_regno_def_p (struct df *, basic_block, rtx, unsigned int);
|
|
|
|
extern int df_insn_dominates_all_uses_p (struct df *, basic_block, rtx);
|
|
|
|
extern int df_insn_dominates_uses_p (struct df *, basic_block, rtx, bitmap);
|
|
|
|
extern int df_bb_reg_live_start_p (struct df *, basic_block, rtx);
|
|
|
|
extern int df_bb_reg_live_end_p (struct df *, basic_block, rtx);
|
|
|
|
extern int df_bb_regs_lives_compare (struct df *, basic_block, rtx, rtx);
|
|
|
|
extern rtx df_bb_single_def_use_insn_find (struct df *, basic_block, rtx,
|
|
rtx);
|
|
|
|
|
|
/* Functions for debugging from GDB. */
|
|
|
|
extern void debug_df_insn (rtx);
|
|
|
|
extern void debug_df_regno (unsigned int);
|
|
|
|
extern void debug_df_reg (rtx);
|
|
|
|
extern void debug_df_defno (unsigned int);
|
|
|
|
extern void debug_df_useno (unsigned int);
|
|
|
|
extern void debug_df_ref (struct ref *);
|
|
|
|
extern void debug_df_chain (struct df_link *);
|
|
|
|
extern void df_insn_debug (struct df *, rtx, FILE *);
|
|
|
|
extern void df_insn_debug_regno (struct df *, rtx, FILE *);
|
|
|
|
|
|
/* Meet over any path (UNION) or meet over all paths (INTERSECTION). */
|
|
enum df_confluence_op
|
|
{
|
|
DF_UNION,
|
|
DF_INTERSECTION
|
|
};
|
|
|
|
|
|
/* Dataflow direction. */
|
|
enum df_flow_dir
|
|
{
|
|
DF_FORWARD,
|
|
DF_BACKWARD
|
|
};
|
|
|
|
|
|
typedef void (*transfer_function_sbitmap) (int, int *, sbitmap, sbitmap,
|
|
sbitmap, sbitmap, void *);
|
|
|
|
typedef void (*transfer_function_bitmap) (int, int *, bitmap, bitmap,
|
|
bitmap, bitmap, void *);
|
|
|
|
extern void iterative_dataflow_sbitmap (sbitmap *, sbitmap *, sbitmap *,
|
|
sbitmap *, bitmap, enum df_flow_dir,
|
|
enum df_confluence_op,
|
|
transfer_function_sbitmap,
|
|
int *, void *);
|
|
|
|
extern void iterative_dataflow_bitmap (bitmap *, bitmap *, bitmap *,
|
|
bitmap *, bitmap,
|
|
enum df_flow_dir,
|
|
enum df_confluence_op,
|
|
transfer_function_bitmap,
|
|
int *, void *);
|
|
extern bool read_modify_subreg_p (rtx);
|