diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/tree-ssa-threadbackward.c | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/gcc/tree-ssa-threadbackward.c b/gcc/tree-ssa-threadbackward.c index f9485bf..8424954 100644 --- a/gcc/tree-ssa-threadbackward.c +++ b/gcc/tree-ssa-threadbackward.c @@ -186,11 +186,10 @@ back_threader::debug_counter () return true; } -// Register the current path for jump threading if it's profitable to -// do so. // -// Return the known taken edge out of the path, even if the path was -// not registered, or NULL if the taken edge could not be determined. +// Return NULL if it is unprofitable to thread this path, or the +// outgoing edge is unknown. Return UNREACHABLE_EDGE if the path is +// unreachable. edge back_threader::maybe_register_path () @@ -199,23 +198,26 @@ back_threader::maybe_register_path () if (taken_edge && taken_edge != UNREACHABLE_EDGE) { - // Avoid circular paths. if (m_visited_bbs.contains (taken_edge->dest)) - return UNREACHABLE_EDGE; - - bool irreducible = false; - bool profitable - = m_profit.profitable_path_p (m_path, m_name, taken_edge, &irreducible); - - if (profitable) { - if (!debug_counter ()) - return NULL; - - m_registry.register_path (m_path, taken_edge); + // Avoid circular paths by indicating there is nothing to + // see in this direction. + taken_edge = UNREACHABLE_EDGE; + } + else + { + bool irreducible = false; + if (m_profit.profitable_path_p (m_path, m_name, taken_edge, + &irreducible) + && debug_counter ()) + { + m_registry.register_path (m_path, taken_edge); - if (irreducible) - vect_free_loop_info_assumptions (m_path[0]->loop_father); + if (irreducible) + vect_free_loop_info_assumptions (m_path[0]->loop_father); + } + else + taken_edge = NULL; } } return taken_edge; |