X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fcfgloop.h;h=d21d50bebdd0eb22129fdc02fe65d29bdd4327db;hb=97ba552253e2473141a58a0829fe797af9660601;hp=4a13a6ac06bca2459282bb3ed32a0f4e2770610b;hpb=0c3c2e56fcc261364645b2697ef79dd804747376;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/cfgloop.h b/gcc/cfgloop.h index 4a13a6ac06b..d21d50bebdd 100644 --- a/gcc/cfgloop.h +++ b/gcc/cfgloop.h @@ -1,12 +1,12 @@ /* Natural loop functions - Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 - Free Software Foundation, Inc. + Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, + 2005, 2006, 2007 Free Software Foundation, Inc. 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 +Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY @@ -15,9 +15,8 @@ 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, 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301, USA. */ +along with GCC; see the file COPYING3. If not see +. */ #ifndef GCC_CFGLOOP_H #define GCC_CFGLOOP_H @@ -25,6 +24,8 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA #include "basic-block.h" /* For rtx_code. */ #include "rtl.h" +#include "vecprim.h" +#include "double-int.h" /* Structure to hold decision about unrolling/peeling. */ enum lpt_dec @@ -37,7 +38,7 @@ enum lpt_dec LPT_UNROLL_STUPID }; -struct lpt_decision +struct lpt_decision GTY (()) { enum lpt_dec decision; unsigned times; @@ -45,10 +46,10 @@ struct lpt_decision /* The structure describing a bound on number of iterations of a loop. */ -struct nb_iter_bound +struct nb_iter_bound GTY ((chain_next ("%h.next"))) { /* The statement STMT is executed at most ... */ - tree stmt; + gimple stmt; /* ... BOUND + 1 times (BOUND must be an unsigned constant). The + 1 is added for the following reasons: @@ -64,27 +65,51 @@ struct nb_iter_bound are executed at most BOUND times. */ bool is_exit; - /* True if the bound is "realistic" -- i.e., most likely the loop really has - number of iterations close to the bound. Exact bounds (if the number of - iterations of a loop is a constant) and bounds derived from the size of - data accessed in the loop are considered realistic. */ - bool realistic; - /* The next bound in the list. */ struct nb_iter_bound *next; }; +/* Description of the loop exit. */ + +struct loop_exit GTY (()) +{ + /* The exit edge. */ + struct edge_def *e; + + /* Previous and next exit in the list of the exits of the loop. */ + struct loop_exit *prev; + struct loop_exit *next; + + /* Next element in the list of loops from that E exits. */ + struct loop_exit *next_e; +}; + +typedef struct loop *loop_p; +DEF_VEC_P (loop_p); +DEF_VEC_ALLOC_P (loop_p, heap); +DEF_VEC_ALLOC_P (loop_p, gc); + +/* An integer estimation of the number of iterations. Estimate_state + describes what is the state of the estimation. */ +enum loop_estimation +{ + /* Estimate was not computed yet. */ + EST_NOT_COMPUTED, + /* Estimate is ready. */ + EST_AVAILABLE +}; + /* Structure to hold information for each natural loop. */ -struct loop +struct loop GTY ((chain_next ("%h.next"))) { /* Index into loops array. */ int num; /* Basic block of loop header. */ - basic_block header; + struct basic_block_def *header; /* Basic block of loop latch. */ - basic_block latch; + struct basic_block_def *latch; /* For loop unrolling/peeling decision. */ struct lpt_decision lpt_decision; @@ -98,14 +123,8 @@ struct loop /* Number of blocks contained within the loop. */ unsigned num_nodes; - /* The loop nesting depth. */ - int depth; - - /* Superloops of the loop. */ - struct loop **pred; - - /* The outer (parent) loop or NULL if outermost loop. */ - struct loop *outer; + /* Superloops of the loop, starting with the outermost loop. */ + VEC (loop_p, gc) *superloops; /* The first inner (child) loop or NULL if innermost loop. */ struct loop *inner; @@ -113,11 +132,8 @@ struct loop /* Link to the next (sibling) loop. */ struct loop *next; - /* Loop that is copy of this loop. */ - struct loop *copy; - /* Auxiliary info specific to a pass. */ - void *aux; + PTR GTY ((skip (""))) aux; /* The number of times the latch of the loop is executed. This is an INTEGER_CST or an expression containing symbolic @@ -128,24 +144,22 @@ struct loop /* An integer estimation of the number of iterations. Estimate_state describes what is the state of the estimation. */ - enum - { - /* Estimate was not computed yet. */ - EST_NOT_COMPUTED, - /* Estimate was computed, but we could derive no useful bound. */ - EST_NOT_AVAILABLE, - /* Estimate is ready. */ - EST_AVAILABLE - } estimate_state; - double_int estimated_nb_iterations; + enum loop_estimation estimate_state; + + /* An integer guaranteed to bound the number of iterations of the loop + from above. */ + bool any_upper_bound; + double_int nb_iterations_upper_bound; + + /* An integer giving the expected number of iterations of the loop. */ + bool any_estimate; + double_int nb_iterations_estimate; /* Upper bound on number of iterations of a loop. */ struct nb_iter_bound *bounds; - /* If not NULL, loop has just single exit edge stored here (edges to the - EXIT_BLOCK_PTR do not count. Do not use directly; this field should - only be accessed via single_exit/set_single_exit functions. */ - edge single_exit_; + /* Head of the cyclic list of the exits of the loop. */ + struct loop_exit *exits; }; /* Flags for state of loop structure. */ @@ -154,24 +168,29 @@ enum LOOPS_HAVE_PREHEADERS = 1, LOOPS_HAVE_SIMPLE_LATCHES = 2, LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS = 4, - LOOPS_HAVE_MARKED_SINGLE_EXITS = 8 + LOOPS_HAVE_RECORDED_EXITS = 8, + LOOPS_MAY_HAVE_MULTIPLE_LATCHES = 16, + LOOP_CLOSED_SSA = 32, + LOOPS_NEED_FIXUP = 64 }; #define LOOPS_NORMAL (LOOPS_HAVE_PREHEADERS | LOOPS_HAVE_SIMPLE_LATCHES \ | LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS) - -typedef struct loop *loop_p; -DEF_VEC_P (loop_p); -DEF_VEC_ALLOC_P (loop_p, heap); +#define AVOID_CFG_MODIFICATIONS (LOOPS_MAY_HAVE_MULTIPLE_LATCHES) /* Structure to hold CFG information about natural loops within a function. */ -struct loops +struct loops GTY (()) { /* State of loops. */ int state; /* Array of the loops. */ - VEC (loop_p, heap) *larray; + VEC (loop_p, gc) *larray; + + /* Maps edges to the list of their descriptions as loop exits. Edges + whose sources or destinations have loop_father == NULL (which may + happen during the cfg manipulations) should not appear in EXITS. */ + htab_t GTY((param_is (struct loop_exit))) exits; /* Pointer to root of loop hierarchy tree. */ struct loop *tree_root; @@ -179,38 +198,45 @@ struct loops /* Loop recognition. */ extern int flow_loops_find (struct loops *); +extern void disambiguate_loops_with_multiple_latches (void); extern void flow_loops_free (struct loops *); extern void flow_loops_dump (FILE *, void (*)(const struct loop *, FILE *, int), int); extern void flow_loop_dump (const struct loop *, FILE *, void (*)(const struct loop *, FILE *, int), int); +struct loop *alloc_loop (void); extern void flow_loop_free (struct loop *); int flow_loop_nodes_find (basic_block, struct loop *); void fix_loop_structure (bitmap changed_bbs); void mark_irreducible_loops (void); -void mark_single_exit_loops (void); +void release_recorded_exits (void); +void record_loop_exits (void); +void rescan_loop_exit (edge, bool, bool); /* Loop data structure manipulation/querying. */ extern void flow_loop_tree_node_add (struct loop *, struct loop *); extern void flow_loop_tree_node_remove (struct loop *); +extern void add_loop (struct loop *, struct loop *); extern bool flow_loop_nested_p (const struct loop *, const struct loop *); -extern bool flow_bb_inside_loop_p (const struct loop *, const basic_block); +extern bool flow_bb_inside_loop_p (const struct loop *, const_basic_block); extern struct loop * find_common_loop (struct loop *, struct loop *); struct loop *superloop_at_depth (struct loop *, unsigned); -extern unsigned tree_num_loop_insns (struct loop *); -extern int num_loop_insns (struct loop *); -extern int average_num_loop_insns (struct loop *); +struct eni_weights_d; +extern unsigned tree_num_loop_insns (struct loop *, struct eni_weights_d *); +extern int num_loop_insns (const struct loop *); +extern int average_num_loop_insns (const struct loop *); extern unsigned get_loop_level (const struct loop *); -extern bool loop_exit_edge_p (const struct loop *, edge); +extern bool loop_exit_edge_p (const struct loop *, const_edge); extern void mark_loop_exit_edges (void); /* Loops & cfg manipulation. */ extern basic_block *get_loop_body (const struct loop *); +extern unsigned get_loop_body_with_size (const struct loop *, basic_block *, + unsigned); extern basic_block *get_loop_body_in_dom_order (const struct loop *); extern basic_block *get_loop_body_in_bfs_order (const struct loop *); extern VEC (edge, heap) *get_loop_exit_edges (const struct loop *); edge single_exit (const struct loop *); -void set_single_exit (struct loop *, edge); extern unsigned num_loop_branches (const struct loop *); extern edge loop_preheader_edge (const struct loop *); @@ -222,25 +248,29 @@ extern void remove_bb_from_loops (basic_block); extern void cancel_loop_tree (struct loop *); extern void delete_loop (struct loop *); -extern int fix_loop_placement (struct loop *); - enum { CP_SIMPLE_PREHEADERS = 1 }; +basic_block create_preheader (struct loop *, int); extern void create_preheaders (int); extern void force_single_succ_latches (void); extern void verify_loop_structure (void); /* Loop analysis. */ -extern bool just_once_each_iteration_p (const struct loop *, basic_block); +extern bool just_once_each_iteration_p (const struct loop *, const_basic_block); +gcov_type expected_loop_iterations_unbounded (const struct loop *); extern unsigned expected_loop_iterations (const struct loop *); extern rtx doloop_condition_get (rtx); +void estimate_numbers_of_iterations_loop (struct loop *); +HOST_WIDE_INT estimated_loop_iterations_int (struct loop *, bool); +bool estimated_loop_iterations (struct loop *, bool, double_int *); + /* Loop manipulation. */ -extern bool can_duplicate_loop_p (struct loop *loop); +extern bool can_duplicate_loop_p (const struct loop *loop); #define DLTHE_FLAG_UPDATE_FREQ 1 /* Update frequencies in duplicate_loop_to_header_edge. */ @@ -251,13 +281,15 @@ extern bool can_duplicate_loop_p (struct loop *loop); extern struct loop * duplicate_loop (struct loop *, struct loop *); extern bool duplicate_loop_to_header_edge (struct loop *, edge, - unsigned, sbitmap, edge, edge *, - unsigned *, int); + unsigned, sbitmap, edge, + VEC (edge, heap) **, int); extern struct loop *loopify (edge, edge, - basic_block, edge, edge, bool); + basic_block, edge, edge, bool, + unsigned, unsigned); struct loop * loop_version (struct loop *, void *, - basic_block *, bool); + basic_block *, unsigned, unsigned, unsigned, bool); extern bool remove_path (edge); +void scale_loop_frequencies (struct loop *, int, int); /* Induction variable analysis. */ @@ -354,7 +386,6 @@ extern rtx get_iv_value (struct rtx_iv *, rtx); extern bool biv_p (rtx, rtx); extern void find_simple_exit (struct loop *, struct niter_desc *); extern void iv_analysis_done (void); -extern struct df *iv_current_loop_df (void); extern struct niter_desc *get_simple_loop_desc (struct loop *loop); extern void free_simple_loop_desc (struct loop *loop); @@ -375,9 +406,31 @@ get_loop (unsigned num) return VEC_index (loop_p, current_loops->larray, num); } +/* Returns the number of superloops of LOOP. */ + +static inline unsigned +loop_depth (const struct loop *loop) +{ + return VEC_length (loop_p, loop->superloops); +} + +/* Returns the immediate superloop of LOOP, or NULL if LOOP is the outermost + loop. */ + +static inline struct loop * +loop_outer (const struct loop *loop) +{ + unsigned n = VEC_length (loop_p, loop->superloops); + + if (n == 0) + return NULL; + + return VEC_index (loop_p, loop->superloops, n - 1); +} + /* Returns the list of loops in current_loops. */ -static inline VEC (loop_p, heap) * +static inline VEC (loop_p, gc) * get_loops (void) { if (!current_loops) @@ -398,105 +451,171 @@ number_of_loops (void) return VEC_length (loop_p, current_loops->larray); } +/* Returns true if state of the loops satisfies all properties + described by FLAGS. */ + +static inline bool +loops_state_satisfies_p (unsigned flags) +{ + return (current_loops->state & flags) == flags; +} + +/* Sets FLAGS to the loops state. */ + +static inline void +loops_state_set (unsigned flags) +{ + current_loops->state |= flags; +} + +/* Clears FLAGS from the loops state. */ + +static inline void +loops_state_clear (unsigned flags) +{ + if (!current_loops) + return; + current_loops->state &= ~flags; +} + /* Loop iterators. */ /* Flags for loop iteration. */ enum li_flags { - LI_INCLUDE_ROOT, /* Include the fake root of the loop tree. */ - LI_FROM_INNERMOST, /* Iterate over the loops in the reverse order, - starting from innermost ones. */ - LI_ONLY_INNERMOST, /* Iterate only over innermost loops. */ - LI_ONLY_OLD /* Do not traverse the loops created during the - traversal (this is the default behavior with - LI_FROM_INNERMOST). */ + LI_INCLUDE_ROOT = 1, /* Include the fake root of the loop tree. */ + LI_FROM_INNERMOST = 2, /* Iterate over the loops in the reverse order, + starting from innermost ones. */ + LI_ONLY_INNERMOST = 4 /* Iterate only over innermost loops. */ }; /* The iterator for loops. */ typedef struct { - int idx; /* Index of the actual loop. */ - int end; /* Only loops before end should be traversed. */ + /* The list of loops to visit. */ + VEC(int,heap) *to_visit; + + /* The index of the actual loop. */ + unsigned idx; } loop_iterator; static inline void -fel_next (loop_iterator *li, loop_p *loop, unsigned flags) +fel_next (loop_iterator *li, loop_p *loop) { - if (flags & LI_FROM_INNERMOST) - { - li->idx--; - for (; li->idx > li->end; li->idx--) - { - *loop = VEC_index (loop_p, current_loops->larray, li->idx); - if (*loop - && (!(flags & LI_ONLY_INNERMOST) - || (*loop)->inner == NULL)) - return; - } - } - else + int anum; + + while (VEC_iterate (int, li->to_visit, li->idx, anum)) { - if (!(flags & LI_ONLY_OLD)) - li->end = number_of_loops (); li->idx++; - for (; li->idx < li->end; li->idx++) - { - *loop = VEC_index (loop_p, current_loops->larray, li->idx); - if (*loop - && (!(flags & LI_ONLY_INNERMOST) - || (*loop)->inner == NULL)) - return; - } + *loop = get_loop (anum); + if (*loop) + return; } + VEC_free (int, heap, li->to_visit); *loop = NULL; } static inline void fel_init (loop_iterator *li, loop_p *loop, unsigned flags) { + struct loop *aloop; + unsigned i; + int mn; + + li->idx = 0; if (!current_loops) { - li->idx = 0; - li->end = 0; + li->to_visit = NULL; *loop = NULL; return; } - if (flags & LI_FROM_INNERMOST) + li->to_visit = VEC_alloc (int, heap, number_of_loops ()); + mn = (flags & LI_INCLUDE_ROOT) ? 0 : 1; + + if (flags & LI_ONLY_INNERMOST) { - li->idx = number_of_loops (); - li->end = (flags & LI_INCLUDE_ROOT) ? -1 : 0; + for (i = 0; VEC_iterate (loop_p, current_loops->larray, i, aloop); i++) + if (aloop != NULL + && aloop->inner == NULL + && aloop->num >= mn) + VEC_quick_push (int, li->to_visit, aloop->num); + } + else if (flags & LI_FROM_INNERMOST) + { + /* Push the loops to LI->TO_VISIT in postorder. */ + for (aloop = current_loops->tree_root; + aloop->inner != NULL; + aloop = aloop->inner) + continue; + + while (1) + { + if (aloop->num >= mn) + VEC_quick_push (int, li->to_visit, aloop->num); + + if (aloop->next) + { + for (aloop = aloop->next; + aloop->inner != NULL; + aloop = aloop->inner) + continue; + } + else if (!loop_outer (aloop)) + break; + else + aloop = loop_outer (aloop); + } } else { - li->idx = (flags & LI_INCLUDE_ROOT) ? -1 : 0; - li->end = number_of_loops (); + /* Push the loops to LI->TO_VISIT in preorder. */ + aloop = current_loops->tree_root; + while (1) + { + if (aloop->num >= mn) + VEC_quick_push (int, li->to_visit, aloop->num); + + if (aloop->inner != NULL) + aloop = aloop->inner; + else + { + while (aloop != NULL && aloop->next == NULL) + aloop = loop_outer (aloop); + if (aloop == NULL) + break; + aloop = aloop->next; + } + } } - fel_next (li, loop, flags); + + fel_next (li, loop); } #define FOR_EACH_LOOP(LI, LOOP, FLAGS) \ for (fel_init (&(LI), &(LOOP), FLAGS); \ (LOOP); \ - fel_next (&(LI), &(LOOP), FLAGS)) + fel_next (&(LI), &(LOOP))) + +#define FOR_EACH_LOOP_BREAK(LI) \ + { \ + VEC_free (int, heap, (LI)->to_visit); \ + break; \ + } /* The properties of the target. */ -extern unsigned target_avail_regs; /* Number of available registers. */ -extern unsigned target_res_regs; /* Number of reserved registers. */ -extern unsigned target_small_cost; /* The cost for register when there - is a free one. */ -extern unsigned target_pres_cost; /* The cost for register when there are - not too many free ones. */ -extern unsigned target_spill_cost; /* The cost for register when we need - to spill. */ +extern unsigned target_avail_regs; +extern unsigned target_res_regs; +extern unsigned target_reg_cost; +extern unsigned target_spill_cost; /* Register pressure estimation for induction variable optimizations & loop invariant motion. */ -extern unsigned global_cost_for_size (unsigned, unsigned, unsigned); +extern unsigned estimate_reg_pressure_cost (unsigned, unsigned); extern void init_set_costs (void); /* Loop optimizer initialization. */