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
24 #define DF_RD 1 /* Reaching definitions. */
25 #define DF_RU 2 /* Reaching uses. */
26 #define DF_LR 4 /* Live registers. */
27 #define DF_DU_CHAIN 8 /* Def-use chain. */
28 #define DF_UD_CHAIN 16 /* Use-def chain. */
29 #define DF_REG_INFO 32 /* Register info. */
30 #define DF_RD_CHAIN 64 /* Reg-def chain. */
31 #define DF_RU_CHAIN 128 /* Reg-use chain. */
33 #define DF_HARD_REGS 1024
34 #define DF_EQUIV_NOTES 2048 /* Mark uses present in EQUIV/EQUAL notes. */
36 enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
37 DF_REF_REG_MEM_STORE};
39 #define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
41 /* ???> Perhaps all these data structures should be made private
42 to enforce the interface. */
45 /* Link on a def-use or use-def chain. */
53 /* Define a register reference structure. */
56 rtx reg; /* The register referenced. */
57 basic_block bb; /* BB containing ref. */
58 rtx insn; /* Insn containing ref. */
59 rtx *loc; /* Loc is the location of the reg. */
60 struct df_link *chain; /* Head of def-use or use-def chain. */
61 enum df_ref_type type; /* Type of ref. */
62 int id; /* Ref index. */
66 /* One of these structures is allocated for every insn. */
69 struct df_link *defs; /* Head of insn-def chain. */
70 struct df_link *uses; /* Head of insn-use chain. */
71 /* ???? The following luid field should be considerd private so that
72 we can change it on the fly to accommodate new insns? */
73 int luid; /* Logical UID. */
75 rtx insn; /* Backpointer to the insn. */
80 /* One of these structures is allocated for every reg. */
83 struct df_link *defs; /* Head of reg-def chain. */
84 struct df_link *uses; /* Head of reg-use chain. */
91 /* One of these structures is allocated for every basic block. */
94 /* Reaching def bitmaps have def_id elements. */
99 /* Reaching use bitmaps have use_id elements. */
104 /* Live variable bitmaps have n_regs elements. */
117 int flags; /* Indicates what's recorded. */
118 struct bb_info *bbs; /* Basic block table. */
119 struct ref **defs; /* Def table, indexed by def_id. */
120 struct ref **uses; /* Use table, indexed by use_id. */
121 struct ref **reg_def_last; /* Indexed by regno. */
122 struct reg_info *regs; /* Regs table, index by regno. */
123 unsigned int reg_size; /* Size of regs table. */
124 struct insn_info *insns; /* Insn table, indexed by insn UID. */
125 unsigned int insn_size; /* Size of insn table. */
126 unsigned int def_id; /* Next def ID. */
127 unsigned int def_size; /* Size of def table. */
128 unsigned int n_defs; /* Size of def bitmaps. */
129 unsigned int use_id; /* Next use ID. */
130 unsigned int use_size; /* Size of use table. */
131 unsigned int n_uses; /* Size of use bitmaps. */
132 unsigned int n_bbs; /* Number of basic blocks. */
133 unsigned int n_regs; /* Number of regs. */
134 unsigned int def_id_save; /* Saved next def ID. */
135 unsigned int use_id_save; /* Saved next use ID. */
136 bitmap insns_modified; /* Insns that (may) have changed. */
137 bitmap bbs_modified; /* Blocks that (may) have changed. */
138 bitmap all_blocks; /* All blocks in CFG. */
139 /* The bitmap vector of dominators or NULL if not computed.
140 Ideally, this should be a pointer to a CFG object. */
155 #define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
158 /* Macros to access the elements within the ref structure. */
159 #define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
160 ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
161 #define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
162 #define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
163 ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
164 #ifdef OLD_DF_INTERFACE
165 #define DF_REF_REG(REF) DF_REF_REAL_REG(REF)
166 #define DF_REF_LOC(REF) DF_REF_REAL_LOC(REF)
168 #define DF_REF_REG(REF) ((REF)->reg)
169 #define DF_REF_LOC(REF) ((REF)->loc)
171 #define DF_REF_BB(REF) ((REF)->bb)
172 #define DF_REF_BBNO(REF) ((REF)->bb->index)
173 #define DF_REF_INSN(REF) ((REF)->insn)
174 #define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
175 #define DF_REF_TYPE(REF) ((REF)->type)
176 #define DF_REF_CHAIN(REF) ((REF)->chain)
177 #define DF_REF_ID(REF) ((REF)->id)
179 /* Macros to determine the reference type. */
181 #define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
182 #define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
183 #define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
184 #define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
185 #define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
186 || DF_REF_REG_MEM_LOAD_P (REF))
189 /* Macros to access the elements within the reg_info structure table. */
191 #define DF_REGNO_FIRST_DEF(DF, REGNUM) \
192 ((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
193 #define DF_REGNO_LAST_USE(DF, REGNUM) \
194 ((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
196 #define DF_REGNO_FIRST_BB(DF, REGNUM) \
197 (DF_REGNO_FIRST_DEF (DF, REGNUM) \
198 ? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
199 #define DF_REGNO_LAST_BB(DF, REGNUM) \
200 (DF_REGNO_LAST_USE (DF, REGNUM) \
201 ? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
204 /* Macros to access the elements within the insn_info structure table. */
206 #define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
207 #define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
208 #define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
211 /* Functions to build and analyse dataflow information. */
213 extern struct df *df_init PARAMS ((void));
215 extern int df_analyse PARAMS ((struct df *, bitmap, int));
217 extern void df_finish PARAMS ((struct df *));
219 extern void df_dump PARAMS ((struct df *, int, FILE *));
221 /* Functions to modify insns. */
223 extern void df_insn_modify PARAMS ((struct df *, basic_block, rtx));
225 extern rtx df_insn_delete PARAMS ((struct df *, basic_block, rtx));
227 extern rtx df_pattern_emit_before PARAMS ((struct df *, rtx,
230 extern rtx df_jump_pattern_emit_after PARAMS ((struct df *, rtx,
233 extern rtx df_pattern_emit_after PARAMS ((struct df *, rtx,
236 extern rtx df_insn_move_before PARAMS ((struct df *, basic_block, rtx,
239 extern int df_reg_replace PARAMS ((struct df *, bitmap, rtx, rtx));
241 extern int df_ref_reg_replace PARAMS ((struct df *, struct ref *, rtx, rtx));
243 extern int df_ref_remove PARAMS ((struct df *, struct ref *));
245 extern int df_insn_reg_replace PARAMS ((struct df *, basic_block,
248 extern int df_insn_mem_replace PARAMS ((struct df *, basic_block,
251 extern struct ref *df_bb_def_use_swap PARAMS ((struct df *, basic_block,
252 rtx, rtx, unsigned int));
255 /* Functions to query dataflow information. */
257 extern basic_block df_regno_bb PARAMS((struct df *, unsigned int));
259 extern int df_reg_lifetime PARAMS ((struct df *, rtx));
261 extern int df_reg_global_p PARAMS ((struct df *, rtx));
263 extern int df_insn_regno_def_p PARAMS ((struct df *,
264 basic_block, rtx, unsigned int));
266 extern int df_insn_dominates_all_uses_p PARAMS ((struct df *,
269 extern int df_insn_dominates_uses_p PARAMS ((struct df *, basic_block,
272 extern int df_bb_reg_live_start_p PARAMS ((struct df *, basic_block, rtx));
274 extern int df_bb_reg_live_end_p PARAMS ((struct df *, basic_block, rtx));
276 extern int df_bb_regs_lives_compare PARAMS ((struct df *, basic_block,
279 extern rtx df_bb_single_def_use_insn_find PARAMS((struct df *, basic_block,
283 /* Functions for debugging from GDB. */
285 extern void debug_df_insn PARAMS ((rtx));
287 extern void debug_df_regno PARAMS ((unsigned int));
289 extern void debug_df_reg PARAMS ((rtx));
291 extern void debug_df_defno PARAMS ((unsigned int));
293 extern void debug_df_useno PARAMS ((unsigned int));
295 extern void debug_df_ref PARAMS ((struct ref *));
297 extern void debug_df_chain PARAMS ((struct df_link *));
298 extern void df_insn_debug PARAMS ((struct df *, rtx, FILE *));
299 extern void df_insn_debug_regno PARAMS ((struct df *, rtx, FILE *));