Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

8265784: [C2] Hoisting of DecodeN leaves MachTemp inputs behind #3637

@@ -374,7 +374,21 @@ void PhaseCFG::implicit_null_check(Block* block, Node *proj, Node *val, int allo
// Check if we need to hoist decodeHeapOop_not_null first.
Block *valb = get_block_for_node(val);
if( block != valb && block->_dom_depth < valb->_dom_depth ) {
// Hoist it up to the end of the test block.
// Hoist it up to the end of the test block together with its inputs if they exist.
for (uint i = 2; i < val->req(); i++) {
// DecodeN has 2 regular inputs + optional MachTemp or load Base inputs.
Node *temp = val->in(i);
Block *tempb = get_block_for_node(temp);
if (!tempb->dominates(block)) {
assert(block->dominates(tempb), "sanity check: temp node placement");
// We only expect nodes without further inputs, like MachTemp or load Base.
assert(temp->req() == 0 || (temp->req() == 1 && temp->in(0) == (Node*)C->root()),
"need for recursive hoisting not expected");
map_node_to_block(temp, block);
map_node_to_block(val, block);