diff options
Diffstat (limited to 'gcc/cfgloop.h')
| -rw-r--r-- | gcc/cfgloop.h | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/gcc/cfgloop.h b/gcc/cfgloop.h index 3116abf3767..ec1149c8bb8 100644 --- a/gcc/cfgloop.h +++ b/gcc/cfgloop.h @@ -74,6 +74,21 @@ struct nb_iter_bound struct nb_iter_bound *next; }; +/* Description of the loop exit. */ + +struct loop_exit +{ + /* The exit edge. */ + edge 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; +}; + /* Structure to hold information for each natural loop. */ struct loop { @@ -142,10 +157,8 @@ struct loop /* 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. */ @@ -154,7 +167,7 @@ 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 }; #define LOOPS_NORMAL (LOOPS_HAVE_PREHEADERS | LOOPS_HAVE_SIMPLE_LATCHES \ @@ -173,6 +186,11 @@ struct loops /* Array of the loops. */ VEC (loop_p, heap) *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 exits; + /* Pointer to root of loop hierarchy tree. */ struct loop *tree_root; }; @@ -184,11 +202,14 @@ 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 *); @@ -210,7 +231,6 @@ 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 *); |