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8354383: C2: enable sinking of Type nodes out of loop

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Reviewed-by: chagedorn, thartmann
This commit is contained in:
Roland Westrelin 2025-06-10 14:19:19 +00:00
parent 0582bd290d
commit a2f99fd88b
1 changed files with 7 additions and 1 deletions
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8
src/hotspot/share/opto/loopopts.cpp
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@ -1676,6 +1676,10 @@ bool PhaseIdealLoop::safe_for_if_replacement(const Node* dom) const {
// like various versions of induction variable+offset. Clone the
// computation per usage to allow it to sink out of the loop.
void PhaseIdealLoop::try_sink_out_of_loop(Node* n) {
bool is_raw_to_oop_cast = n->is_ConstraintCast() &&
n->in(1)->bottom_type()->isa_rawptr() &&
!n->bottom_type()->isa_rawptr();
if (has_ctrl(n) &&
!n->is_Phi() &&
!n->is_Bool() &&
@ -1685,7 +1689,9 @@ void PhaseIdealLoop::try_sink_out_of_loop(Node* n) {
!n->is_OpaqueNotNull() &&
!n->is_OpaqueInitializedAssertionPredicate() &&
!n->is_OpaqueTemplateAssertionPredicate() &&
!n->is_Type()) {
!is_raw_to_oop_cast && // don't extend live ranges of raw oops
(KillPathsReachableByDeadTypeNode || !n->is_Type())
) {
Node *n_ctrl = get_ctrl(n);
IdealLoopTree *n_loop = get_loop(n_ctrl);