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Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 6d99e54..1b78b6d5 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -479,7 +479,11 @@ tree_ssa_dominator_optimize (void) if (cfg_altered) free_dominance_info (CDI_DOMINATORS); - cfg_altered = cleanup_tree_cfg (); + /* Only iterate if we threaded jumps AND the CFG cleanup did + something interesting. Other cases generate far fewer + optimization opportunities and thus are not worth another + full DOM iteration. */ + cfg_altered &= cleanup_tree_cfg (); if (rediscover_loops_after_threading) { |