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-rw-r--r--gcc/tree-outof-ssa.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/tree-outof-ssa.c b/gcc/tree-outof-ssa.c
index 4de45001e673..45060f70eb02 100644
--- a/gcc/tree-outof-ssa.c
+++ b/gcc/tree-outof-ssa.c
@@ -1021,6 +1021,8 @@ insert_backedge_copies (void)
basic_block bb;
gimple_stmt_iterator gsi;
+ mark_dfs_back_edges ();
+
FOR_EACH_BB (bb)
{
/* Mark block as possibly needing calculation of UIDs. */