diff options
Diffstat (limited to 'gcc/gimple-ssa-split-paths.c')
| -rw-r--r-- | gcc/gimple-ssa-split-paths.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/gimple-ssa-split-paths.c b/gcc/gimple-ssa-split-paths.c index ac6de8147df..d566f64c70b 100644 --- a/gcc/gimple-ssa-split-paths.c +++ b/gcc/gimple-ssa-split-paths.c @@ -294,6 +294,24 @@ split_paths () basic_block pred0 = EDGE_PRED (bb, 0)->src; transform_duplicate (pred0, bb); changed = true; + + /* If BB has an outgoing edge marked as IRREDUCIBLE, then + duplicating BB may result in an irreducible region turning + into a natural loop. + + Long term we might want to hook this into the block + duplication code, but as we've seen with similar changes + for edge removal, that can be somewhat risky. */ + if (EDGE_SUCC (bb, 0)->flags & EDGE_IRREDUCIBLE_LOOP + || EDGE_SUCC (bb, 1)->flags & EDGE_IRREDUCIBLE_LOOP) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, + "Join block %d has EDGE_IRREDUCIBLE_LOOP set. " + "Scheduling loop fixups.\n", + bb->index); + loops_state_set (LOOPS_NEED_FIXUP); + } } } |