When insert_updated_phi_nodes_for tries to skip pruning the IDF to
blocks dominated by the nearest common dominator of the set of
definition blocks it compares against ENTRY_BLOCK but that's never
going to be the common dominator, instead it will be at most its single
successor.
Re-bootstrap and regtest running on x86_64-unknown-linux-gnu.
* tree-into-ssa.cc (insert_updated_phi_nodes_for): Skip
pruning when the nearest common dominator is the successor
of ENTRY_BLOCK.
---
gcc/tree-into-ssa.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/tree-into-ssa.cc b/gcc/tree-into-ssa.cc
index 705e4119ba3..858c3840475 100644
--- a/gcc/tree-into-ssa.cc
+++ b/gcc/tree-into-ssa.cc
@@ -3262,7 +3262,7 @@ insert_updated_phi_nodes_for (tree var, bitmap_head *dfs,
common dominator of all the definition blocks. */
entry = nearest_common_dominator_for_set (CDI_DOMINATORS,
db->def_blocks);
- if (entry != ENTRY_BLOCK_PTR_FOR_FN (cfun))
+ if (entry != single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun)))
EXECUTE_IF_SET_IN_BITMAP (idf, 0, i, bi)
if (BASIC_BLOCK_FOR_FN (cfun, i) != entry
&& dominated_by_p (CDI_DOMINATORS,
--
2.35.3
