sese region;
};
-/* Returns non NULL when BB has a single predecessor and the last
- statement of that predecessor is a COND_EXPR. */
+/* Returns a COND_EXPR statement when BB has a single predecessor, the
+ edge between BB and its predecessor is not a loop exit edge, and
+ the last statement of the single predecessor is a COND_EXPR. */
static gimple
-single_pred_cond (basic_block bb)
+single_pred_cond_non_loop_exit (basic_block bb)
{
if (single_pred_p (bb))
{
edge e = single_pred_edge (bb);
basic_block pred = e->src;
- gimple stmt = last_stmt (pred);
+ gimple stmt;
+
+ if (loop_depth (pred->loop_father) > loop_depth (bb->loop_father))
+ return NULL;
+
+ stmt = last_stmt (pred);
if (stmt && gimple_code (stmt) == GIMPLE_COND)
return stmt;
}
+
return NULL;
}
if (!bb_in_sese_p (bb, data->region))
return;
- stmt = single_pred_cond (bb);
+ stmt = single_pred_cond_non_loop_exit (bb);
if (stmt)
{
if (!bb_in_sese_p (bb, data->region))
return;
- if (single_pred_cond (bb))
+ if (single_pred_cond_non_loop_exit (bb))
{
VEC_pop (gimple, *conditions);
VEC_pop (gimple, *cases);