Jeff Law wrote:
OK to commit. Thanks for your patience.
Can you follow-up with a change which throttles this optimization
when -Os is in effect. You can check optimize_function_for_size_p
(cfun) and simply avoid the backward traversal or you could allow it
in that case if the amount of copying is suitably small. Your call.
I think it does not make sense to duplicate paths at -Os: I disabled the FSM
jump-threading when optimizing for size like this.
diff --git a/gcc/tree-ssa-threadedge.c b/gcc/tree-ssa-threadedge.c
index 29b20c8..ce70311 100644
--- a/gcc/tree-ssa-threadedge.c
+++ b/gcc/tree-ssa-threadedge.c
@@ -1335,8 +1335,9 @@ thread_through_normal_block (edge e,
return 1;
}
if (!flag_expensive_optimizations
+ || optimize_function_for_size_p (cfun)
|| TREE_CODE (cond) != SSA_NAME
|| e->dest->loop_father != e->src->loop_father
|| loop_depth (e->dest->loop_father) == 0)
return 0;
I will regstrap and commit the attached patch.