The insert iteration can be corrupted by foldings of replace_uses_by,
within this particular PHI replacement but also with subsequent ones.
Recompute the insert location before insertion instead.
This fixes an obvserved ICE of gcc.dg/tree-ssa/ssa-sink-16.c.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/112827
PR tree-optimization/112848
* tree-scalar-evolution.cc (final_value_replacement_loop):
Compute the insert location for each insert.
---
gcc/tree-scalar-evolution.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/tree-scalar-evolution.cc b/gcc/tree-scalar-evolution.cc
index 065bcd0743d..38821ffb15a 100644
--- a/gcc/tree-scalar-evolution.cc
+++ b/gcc/tree-scalar-evolution.cc
@@ -3739,7 +3739,6 @@ final_value_replacement_loop (class loop *loop)
split_loop_exit_edge (exit);
/* Set stmt insertion pointer. All stmts are inserted before this point. */
- gimple_stmt_iterator gsi = gsi_after_labels (exit->dest);
class loop *ex_loop
= superloop_at_depth (loop,
@@ -3883,6 +3882,7 @@ final_value_replacement_loop (class loop *loop)
gsi_next (&gsi2);
}
}
+ gimple_stmt_iterator gsi = gsi_after_labels (exit->dest);
gsi_insert_seq_before (&gsi, stmts, GSI_SAME_STMT);
if (dump_file)
{
--
2.35.3
