Commit c64fe299 authored by Andreas Zwinkau's avatar Andreas Zwinkau
Browse files

Do not gcse unreachable code

During global CSE we now ignore nodes in unreachable blocks,
otherwise cse could pick the wrong representative node
and use unreachable nodes in reachable code.
parent 43a7a281
......@@ -6129,6 +6129,16 @@ ir_node *identify_remember(ir_node *n)
if (value_table == NULL)
return n;
if (get_opt_global_cse()) {
/* do not remember unreachable nodes */
if (get_irg_dom_state(irg) == dom_consistent && !is_Block(n)) {
ir_node *block = get_nodes_block(n);
if (get_Block_dom_depth(block) < 0) {
return n;
/* lookup or insert in hash table with given hash key. */
nn = (ir_node*)pset_insert(value_table, n, ir_node_hash(n));
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