1 /* Form lists of pseudo register references for autoinc optimization
2 for GNU compiler. This is part of flow optimization.
3 Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
4 Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 #define DF_RD 1 /* Reaching definitions. */
24 #define DF_RU 2 /* Reaching uses. */
25 #define DF_LR 4 /* Live registers. */
26 #define DF_DU_CHAIN 8 /* Def-use chain. */
27 #define DF_UD_CHAIN 16 /* Use-def chain. */
28 #define DF_REG_INFO 32 /* Register info. */
29 #define DF_RD_CHAIN 64 /* Reg-def chain. */
30 #define DF_RU_CHAIN 128 /* Reg-use chain. */
32 #define DF_HARD_REGS 1024
33 #define DF_EQUIV_NOTES 2048 /* Mark uses present in EQUIV/EQUAL notes. */
35 enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
36 DF_REF_REG_MEM_STORE};
38 #define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
40 /* ???> Perhaps all these data structures should be made private
41 to enforce the interface. */
44 /* Link on a def-use or use-def chain. */
52 /* Define a register reference structure. */
55 rtx reg; /* The register referenced. */
56 basic_block bb; /* BB containing ref. */
57 rtx insn; /* Insn containing ref. */
58 rtx *loc; /* Loc is the location of the reg. */
59 struct df_link *chain; /* Head of def-use or use-def chain. */
60 enum df_ref_type type; /* Type of ref. */
61 int id; /* Ref index. */
65 /* One of these structures is allocated for every insn. */
68 struct df_link *defs; /* Head of insn-def chain. */
69 struct df_link *uses; /* Head of insn-use chain. */
70 /* ???? The following luid field should be considerd private so that
71 we can change it on the fly to accommodate new insns? */
72 int luid; /* Logical UID. */
74 rtx insn; /* Backpointer to the insn. */
79 /* One of these structures is allocated for every reg. */
82 struct df_link *defs; /* Head of reg-def chain. */
83 struct df_link *uses; /* Head of reg-use chain. */
90 /* One of these structures is allocated for every basic block. */
93 /* Reaching def bitmaps have def_id elements. */
98 /* Reaching use bitmaps have use_id elements. */
103 /* Live variable bitmaps have n_regs elements. */
116 int flags; /* Indicates what's recorded. */
117 struct bb_info *bbs; /* Basic block table. */
118 struct ref **defs; /* Def table, indexed by def_id. */
119 struct ref **uses; /* Use table, indexed by use_id. */
120 struct ref **reg_def_last; /* Indexed by regno. */
121 struct reg_info *regs; /* Regs table, index by regno. */
122 unsigned int reg_size; /* Size of regs table. */
123 struct insn_info *insns; /* Insn table, indexed by insn UID. */
124 unsigned int insn_size; /* Size of insn table. */
125 unsigned int def_id; /* Next def ID. */
126 unsigned int def_size; /* Size of def table. */
127 unsigned int n_defs; /* Size of def bitmaps. */
128 unsigned int use_id; /* Next use ID. */
129 unsigned int use_size; /* Size of use table. */
130 unsigned int n_uses; /* Size of use bitmaps. */
131 unsigned int n_bbs; /* Number of basic blocks. */
132 unsigned int n_regs; /* Number of regs. */
133 unsigned int def_id_save; /* Saved next def ID. */
134 unsigned int use_id_save; /* Saved next use ID. */
135 bitmap insns_modified; /* Insns that (may) have changed. */
136 bitmap bbs_modified; /* Blocks that (may) have changed. */
137 bitmap all_blocks; /* All blocks in CFG. */
138 /* The sbitmap vector of dominators or NULL if not computed.
139 Ideally, this should be a pointer to a CFG object. */
141 int * dfs_order; /* DFS order -> block number */
142 int * rc_order; /* reverse completion order -> block number */
143 int * rts_order; /* reverse top sort order -> block number */
144 int * inverse_rc_map; /* block number -> reverse completion order */
145 int * inverse_dfs_map; /* block number -> DFS order */
146 int * inverse_rts_map; /* block number -> reverse top-sort order */
157 #define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
160 /* Macros to access the elements within the ref structure. */
161 #define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
162 ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
163 #define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
164 #define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
165 ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
166 #ifdef OLD_DF_INTERFACE
167 #define DF_REF_REG(REF) DF_REF_REAL_REG(REF)
168 #define DF_REF_LOC(REF) DF_REF_REAL_LOC(REF)
170 #define DF_REF_REG(REF) ((REF)->reg)
171 #define DF_REF_LOC(REF) ((REF)->loc)
173 #define DF_REF_BB(REF) ((REF)->bb)
174 #define DF_REF_BBNO(REF) ((REF)->bb->index)
175 #define DF_REF_INSN(REF) ((REF)->insn)
176 #define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
177 #define DF_REF_TYPE(REF) ((REF)->type)
178 #define DF_REF_CHAIN(REF) ((REF)->chain)
179 #define DF_REF_ID(REF) ((REF)->id)
181 /* Macros to determine the reference type. */
183 #define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
184 #define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
185 #define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
186 #define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
187 #define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
188 || DF_REF_REG_MEM_LOAD_P (REF))
191 /* Macros to access the elements within the reg_info structure table. */
193 #define DF_REGNO_FIRST_DEF(DF, REGNUM) \
194 ((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
195 #define DF_REGNO_LAST_USE(DF, REGNUM) \
196 ((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
198 #define DF_REGNO_FIRST_BB(DF, REGNUM) \
199 (DF_REGNO_FIRST_DEF (DF, REGNUM) \
200 ? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
201 #define DF_REGNO_LAST_BB(DF, REGNUM) \
202 (DF_REGNO_LAST_USE (DF, REGNUM) \
203 ? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
206 /* Macros to access the elements within the insn_info structure table. */
208 #define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
209 #define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
210 #define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
213 /* Functions to build and analyse dataflow information. */
215 extern struct df *df_init PARAMS ((void));
217 extern int df_analyse PARAMS ((struct df *, bitmap, int));
219 extern void df_finish PARAMS ((struct df *));
221 extern void df_dump PARAMS ((struct df *, int, FILE *));
223 /* Functions to modify insns. */
225 extern void df_insn_modify PARAMS ((struct df *, basic_block, rtx));
227 extern rtx df_insn_delete PARAMS ((struct df *, basic_block, rtx));
229 extern rtx df_pattern_emit_before PARAMS ((struct df *, rtx,
232 extern rtx df_jump_pattern_emit_after PARAMS ((struct df *, rtx,
235 extern rtx df_pattern_emit_after PARAMS ((struct df *, rtx,
238 extern rtx df_insn_move_before PARAMS ((struct df *, basic_block, rtx,
241 extern int df_reg_replace PARAMS ((struct df *, bitmap, rtx, rtx));
243 extern int df_ref_reg_replace PARAMS ((struct df *, struct ref *, rtx, rtx));
245 extern int df_ref_remove PARAMS ((struct df *, struct ref *));
247 extern int df_insn_reg_replace PARAMS ((struct df *, basic_block,
250 extern int df_insn_mem_replace PARAMS ((struct df *, basic_block,
253 extern struct ref *df_bb_def_use_swap PARAMS ((struct df *, basic_block,
254 rtx, rtx, unsigned int));
257 /* Functions to query dataflow information. */
259 extern basic_block df_regno_bb PARAMS((struct df *, unsigned int));
261 extern int df_reg_lifetime PARAMS ((struct df *, rtx));
263 extern int df_reg_global_p PARAMS ((struct df *, rtx));
265 extern int df_insn_regno_def_p PARAMS ((struct df *,
266 basic_block, rtx, unsigned int));
268 extern int df_insn_dominates_all_uses_p PARAMS ((struct df *,
271 extern int df_insn_dominates_uses_p PARAMS ((struct df *, basic_block,
274 extern int df_bb_reg_live_start_p PARAMS ((struct df *, basic_block, rtx));
276 extern int df_bb_reg_live_end_p PARAMS ((struct df *, basic_block, rtx));
278 extern int df_bb_regs_lives_compare PARAMS ((struct df *, basic_block,
281 extern rtx df_bb_single_def_use_insn_find PARAMS((struct df *, basic_block,
285 /* Functions for debugging from GDB. */
287 extern void debug_df_insn PARAMS ((rtx));
289 extern void debug_df_regno PARAMS ((unsigned int));
291 extern void debug_df_reg PARAMS ((rtx));
293 extern void debug_df_defno PARAMS ((unsigned int));
295 extern void debug_df_useno PARAMS ((unsigned int));
297 extern void debug_df_ref PARAMS ((struct ref *));
299 extern void debug_df_chain PARAMS ((struct df_link *));
300 extern void df_insn_debug PARAMS ((struct df *, rtx, FILE *));
301 extern void df_insn_debug_regno PARAMS ((struct df *, rtx, FILE *));
302 /* Meet over any path (UNION) or meet over all paths (INTERSECTION) */
303 enum df_confluence_op
308 /* Dataflow direction */
315 typedef void (*transfer_function_sbitmap) (int, int *, sbitmap, sbitmap,
316 sbitmap, sbitmap, void *);
317 typedef void (*transfer_function_bitmap) (int, int *, bitmap, bitmap,
318 bitmap, bitmap, void *);
320 extern void iterative_dataflow_sbitmap PARAMS ((sbitmap *, sbitmap *,
321 sbitmap *, sbitmap *,
322 bitmap, enum df_flow_dir,
323 enum df_confluence_op,
324 transfer_function_sbitmap,
326 extern void iterative_dataflow_bitmap PARAMS ((bitmap *, bitmap *, bitmap *,
329 enum df_confluence_op,
330 transfer_function_bitmap,