diff options
Diffstat (limited to 'gcc/tree-cfg.c')
| -rw-r--r-- | gcc/tree-cfg.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index 0c350a6f257..1a166cc4994 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -5335,6 +5335,44 @@ gimple_move_block_after (basic_block bb, basic_block after) } +/* Return TRUE if block BB has no executable statements, otherwise return + FALSE. */ + +bool +gimple_empty_block_p (basic_block bb) +{ + /* BB must have no executable statements. */ + gimple_stmt_iterator gsi = gsi_after_labels (bb); + if (phi_nodes (bb)) + return false; + if (gsi_end_p (gsi)) + return true; + if (is_gimple_debug (gsi_stmt (gsi))) + gsi_next_nondebug (&gsi); + return gsi_end_p (gsi); +} + + +/* Split a basic block if it ends with a conditional branch and if the + other part of the block is not empty. */ + +static basic_block +gimple_split_block_before_cond_jump (basic_block bb) +{ + gimple last, split_point; + gimple_stmt_iterator gsi = gsi_last_nondebug_bb (bb); + if (gsi_end_p (gsi)) + return NULL; + last = gsi_stmt (gsi); + if (gimple_code (last) != GIMPLE_COND + && gimple_code (last) != GIMPLE_SWITCH) + return NULL; + gsi_prev_nondebug (&gsi); + split_point = gsi_stmt (gsi); + return split_block (bb, split_point)->dest; +} + + /* Return true if basic_block can be duplicated. */ static bool @@ -7492,7 +7530,9 @@ struct cfg_hooks gimple_cfg_hooks = { gimple_lv_add_condition_to_bb, /* lv_add_condition_to_bb */ gimple_lv_adjust_loop_header_phi, /* lv_adjust_loop_header_phi*/ extract_true_false_edges_from_block, /* extract_cond_bb_edges */ - flush_pending_stmts /* flush_pending_stmts */ + flush_pending_stmts, /* flush_pending_stmts */ + gimple_empty_block_p, /* block_empty_p */ + gimple_split_block_before_cond_jump, /* split_block_before_cond_jump */ }; |