diff options
Diffstat (limited to 'gcc/cfgbuild.c')
| -rw-r--r-- | gcc/cfgbuild.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/gcc/cfgbuild.c b/gcc/cfgbuild.c index 07ef949d2..6e5c6ef75 100644 --- a/gcc/cfgbuild.c +++ b/gcc/cfgbuild.c @@ -559,16 +559,35 @@ compute_outgoing_frequencies (basic_block b) f->count = b->count - e->count; return; } + else + { + guess_outgoing_edge_probabilities (b); + } } - - if (single_succ_p (b)) + else if (single_succ_p (b)) { e = single_succ_edge (b); e->probability = REG_BR_PROB_BASE; e->count = b->count; return; } - guess_outgoing_edge_probabilities (b); + else + { + /* We rely on BBs with more than two successors to have sane probabilities + and do not guess them here. For BBs terminated by switch statements + expanded to jump-table jump, we have done the right thing during + expansion. For EH edges, we still guess the probabilities here. */ + bool complex_edge = false; + FOR_EACH_EDGE (e, ei, b->succs) + if (e->flags & EDGE_COMPLEX) + { + complex_edge = true; + break; + } + if (complex_edge) + guess_outgoing_edge_probabilities (b); + } + if (b->count) FOR_EACH_EDGE (e, ei, b->succs) e->count = ((b->count * e->probability + REG_BR_PROB_BASE / 2) |