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, 2003, 2004 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
28 #include "basic-block.h"
30 #define DF_RD 1 /* Reaching definitions. */
31 #define DF_RU 2 /* Reaching uses. */
32 #define DF_LR 4 /* Live registers. */
33 #define DF_DU_CHAIN 8 /* Def-use chain. */
34 #define DF_UD_CHAIN 16 /* Use-def chain. */
35 #define DF_REG_INFO 32 /* Register info. */
36 #define DF_RD_CHAIN 64 /* Reg-def chain. */
37 #define DF_RU_CHAIN 128 /* Reg-use chain. */
39 #define DF_HARD_REGS 1024 /* Mark hard registers. */
40 #define DF_EQUIV_NOTES 2048 /* Mark uses present in EQUIV/EQUAL notes. */
41 #define DF_FOR_REGALLOC 4096 /* If called for the register allocator. */
43 enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
44 DF_REF_REG_MEM_STORE};
46 #define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
48 /* Link on a def-use or use-def chain. */
57 /* Read-modify-write refs generate both a use and a def and
58 these are marked with this flag to show that they are not
60 DF_REF_READ_WRITE = 1,
62 /* This flag is set on register references inside a subreg on
63 machines which have CANNOT_CHANGE_MODE_CLASS.
64 Note, that this flag can also be set on df_refs representing
65 the REG itself (i.e., one might not see the subreg anymore).
66 Also note, that this flag is set also for hardreg refs, i.e.,
67 you must check yourself if it's a pseudo. */
68 DF_REF_MODE_CHANGE = 2,
70 /* This flag is set, if we stripped the subreg from the reference.
71 In this case we must make conservative guesses, at what the
75 /* This flag is set during register allocation if it's okay for
76 the reference's INSN to have one of its operands replaced with a
82 /* Define a register reference structure. One of these is allocated
83 for every register reference (use or def). Note some register
84 references (e.g., post_inc, subreg) generate both a def and a use. */
87 rtx reg; /* The register referenced. */
88 rtx insn; /* Insn containing ref. */
89 rtx *loc; /* The location of the reg. */
90 struct df_link *chain; /* Head of def-use or use-def chain. */
91 unsigned int id; /* Ref index. */
92 enum df_ref_type type; /* Type of ref. */
93 enum df_ref_flags flags; /* Various flags. */
97 /* One of these structures is allocated for every insn. */
100 struct df_link *defs; /* Head of insn-def chain. */
101 struct df_link *uses; /* Head of insn-use chain. */
102 /* ???? The following luid field should be considered private so that
103 we can change it on the fly to accommodate new insns? */
104 int luid; /* Logical UID. */
108 /* One of these structures is allocated for every reg. */
111 struct df_link *defs; /* Head of reg-def chain. */
112 struct df_link *uses; /* Head of reg-use chain. */
119 /* One of these structures is allocated for every basic block. */
122 /* Reaching def bitmaps have def_id elements. */
127 /* Reaching use bitmaps have use_id elements. */
132 /* Live variable bitmaps have n_regs elements. */
145 int flags; /* Indicates what's recorded. */
146 struct bb_info *bbs; /* Basic block table. */
147 struct ref **defs; /* Def table, indexed by def_id. */
148 struct ref **uses; /* Use table, indexed by use_id. */
149 struct ref **reg_def_last; /* Indexed by regno. */
150 struct reg_info *regs; /* Regs table, index by regno. */
151 unsigned int reg_size; /* Size of regs table. */
152 struct insn_info *insns; /* Insn table, indexed by insn UID. */
153 unsigned int insn_size; /* Size of insn table. */
154 unsigned int def_id; /* Next def ID. */
155 unsigned int def_size; /* Size of def table. */
156 unsigned int n_defs; /* Size of def bitmaps. */
157 unsigned int use_id; /* Next use ID. */
158 unsigned int use_size; /* Size of use table. */
159 unsigned int n_uses; /* Size of use bitmaps. */
160 unsigned int n_bbs; /* Number of basic blocks. */
161 unsigned int n_regs; /* Number of regs. */
162 unsigned int def_id_save; /* Saved next def ID. */
163 unsigned int use_id_save; /* Saved next use ID. */
164 bitmap insns_modified; /* Insns that (may) have changed. */
165 bitmap bbs_modified; /* Blocks that (may) have changed. */
166 bitmap all_blocks; /* All blocks in CFG. */
167 /* The sbitmap vector of dominators or NULL if not computed.
168 Ideally, this should be a pointer to a CFG object. */
170 int *dfs_order; /* DFS order -> block number. */
171 int *rc_order; /* Reverse completion order -> block number. */
172 int *rts_order; /* Reverse top sort order -> block number. */
173 int *inverse_rc_map; /* Block number -> reverse completion order. */
174 int *inverse_dfs_map; /* Block number -> DFS order. */
175 int *inverse_rts_map; /* Block number -> reverse top-sort order. */
186 #define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
189 /* Macros to access the elements within the ref structure. */
191 #define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
192 ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
193 #define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
194 #define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
195 ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
196 #define DF_REF_REG(REF) ((REF)->reg)
197 #define DF_REF_LOC(REF) ((REF)->loc)
198 #define DF_REF_BB(REF) (BLOCK_FOR_INSN ((REF)->insn))
199 #define DF_REF_BBNO(REF) (BLOCK_FOR_INSN ((REF)->insn)->index)
200 #define DF_REF_INSN(REF) ((REF)->insn)
201 #define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
202 #define DF_REF_TYPE(REF) ((REF)->type)
203 #define DF_REF_CHAIN(REF) ((REF)->chain)
204 #define DF_REF_ID(REF) ((REF)->id)
205 #define DF_REF_FLAGS(REF) ((REF)->flags)
207 /* Macros to determine the reference type. */
209 #define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
210 #define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
211 #define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
212 #define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
213 #define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
214 || DF_REF_REG_MEM_LOAD_P (REF))
217 /* Macros to access the elements within the reg_info structure table. */
219 #define DF_REGNO_FIRST_DEF(DF, REGNUM) \
220 ((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
221 #define DF_REGNO_LAST_USE(DF, REGNUM) \
222 ((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
224 #define DF_REGNO_FIRST_BB(DF, REGNUM) \
225 (DF_REGNO_FIRST_DEF (DF, REGNUM) \
226 ? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
227 #define DF_REGNO_LAST_BB(DF, REGNUM) \
228 (DF_REGNO_LAST_USE (DF, REGNUM) \
229 ? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
232 /* Macros to access the elements within the insn_info structure table. */
234 #define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
235 #define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
236 #define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
239 /* Functions to build and analyze dataflow information. */
241 extern struct df *df_init (void);
243 extern int df_analyze (struct df *, bitmap, int);
245 extern void df_finish (struct df *);
247 extern void df_dump (struct df *, int, FILE *);
250 /* Functions to modify insns. */
252 extern void df_insn_modify (struct df *, basic_block, rtx);
254 extern rtx df_insn_delete (struct df *, basic_block, rtx);
256 extern rtx df_pattern_emit_before (struct df *, rtx, basic_block, rtx);
258 extern rtx df_jump_pattern_emit_after (struct df *, rtx, basic_block, rtx);
260 extern rtx df_pattern_emit_after (struct df *, rtx, basic_block, rtx);
262 extern rtx df_insn_move_before (struct df *, basic_block, rtx, basic_block,
265 extern int df_reg_replace (struct df *, bitmap, rtx, rtx);
267 extern int df_ref_reg_replace (struct df *, struct ref *, rtx, rtx);
269 extern int df_ref_remove (struct df *, struct ref *);
271 extern int df_insn_reg_replace (struct df *, basic_block, rtx, rtx, rtx);
273 extern int df_insn_mem_replace (struct df *, basic_block, rtx, rtx, rtx);
275 extern struct ref *df_bb_def_use_swap (struct df *, basic_block, rtx, rtx,
279 /* Functions to query dataflow information. */
281 extern basic_block df_regno_bb (struct df *, unsigned int);
283 extern int df_reg_lifetime (struct df *, rtx);
285 extern int df_reg_global_p (struct df *, rtx);
287 extern int df_insn_regno_def_p (struct df *, basic_block, rtx, unsigned int);
289 extern int df_insn_dominates_all_uses_p (struct df *, basic_block, rtx);
291 extern int df_insn_dominates_uses_p (struct df *, basic_block, rtx, bitmap);
293 extern int df_bb_reg_live_start_p (struct df *, basic_block, rtx);
295 extern int df_bb_reg_live_end_p (struct df *, basic_block, rtx);
297 extern int df_bb_regs_lives_compare (struct df *, basic_block, rtx, rtx);
299 extern rtx df_bb_single_def_use_insn_find (struct df *, basic_block, rtx,
301 extern struct ref *df_bb_regno_last_use_find (struct df *, basic_block, unsigned int);
303 extern struct ref *df_bb_regno_first_def_find (struct df *, basic_block, unsigned int);
305 extern struct ref *df_bb_regno_last_def_find (struct df *, basic_block, unsigned int);
307 extern struct ref *df_find_def (struct df *, rtx, rtx);
309 extern int df_reg_used (struct df *, rtx, rtx);
312 /* Functions for debugging from GDB. */
314 extern void debug_df_insn (rtx);
316 extern void debug_df_regno (unsigned int);
318 extern void debug_df_reg (rtx);
320 extern void debug_df_defno (unsigned int);
322 extern void debug_df_useno (unsigned int);
324 extern void debug_df_ref (struct ref *);
326 extern void debug_df_chain (struct df_link *);
328 extern void df_insn_debug (struct df *, rtx, FILE *);
330 extern void df_insn_debug_regno (struct df *, rtx, FILE *);
333 /* Meet over any path (UNION) or meet over all paths (INTERSECTION). */
334 enum df_confluence_op
341 /* Dataflow direction. */
349 typedef void (*transfer_function_sbitmap) (int, int *, sbitmap, sbitmap,
350 sbitmap, sbitmap, void *);
352 typedef void (*transfer_function_bitmap) (int, int *, bitmap, bitmap,
353 bitmap, bitmap, void *);
355 extern void iterative_dataflow_sbitmap (sbitmap *, sbitmap *, sbitmap *,
356 sbitmap *, bitmap, enum df_flow_dir,
357 enum df_confluence_op,
358 transfer_function_sbitmap,
361 extern void iterative_dataflow_bitmap (bitmap *, bitmap *, bitmap *,
364 enum df_confluence_op,
365 transfer_function_bitmap,
367 extern bool read_modify_subreg_p (rtx);
369 #endif /* GCC_DF_H */