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Diffstat (limited to 'gcc/tree-ssa-tail-merge.c')
| -rw-r--r-- | gcc/tree-ssa-tail-merge.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/tree-ssa-tail-merge.c b/gcc/tree-ssa-tail-merge.c index 25ec43ebd7d..4be35f69522 100644 --- a/gcc/tree-ssa-tail-merge.c +++ b/gcc/tree-ssa-tail-merge.c @@ -1559,7 +1559,12 @@ tail_merge_optimize (unsigned int todo) timevar_push (TV_TREE_TAIL_MERGE); - calculate_dominance_info (CDI_DOMINATORS); + if (!dom_info_available_p (CDI_DOMINATORS)) + { + /* PRE can leave us with unreachable blocks, remove them now. */ + delete_unreachable_blocks (); + calculate_dominance_info (CDI_DOMINATORS); + } init_worklist (); while (!VEC_empty (same_succ, worklist)) |