1690   } else {
1691     // Cannot call transform on it just yet
1692     igvn->set_type_bottom(iff);
1693   }
1694   igvn->_worklist.push(iff);
1695 
1696   // Now handle projections.  Cloning not required.
1697   Node* new_if_f = (Node*)(new IfFalseNode( iff ));
1698   Node* new_if_t = (Node*)(new IfTrueNode ( iff ));
1699 
1700   igvn->register_new_node_with_optimizer(new_if_f);
1701   igvn->register_new_node_with_optimizer(new_if_t);
1702   // Flip test, so flip trailing control
1703   igvn->replace_node(old_if_f, new_if_t);
1704   igvn->replace_node(old_if_t, new_if_f);
1705 
1706   // Progress
1707   return iff;
1708 }
1709 
1710 bool IfNode::is_g1_marking_if(PhaseTransform *phase) const {
1711   if (Opcode() != Op_If) {
1712     return false;
1713   }
1714 
1715   Node* bol = in(1);
1716   assert(bol->is_Bool(), "");
1717   Node* cmpx = bol->in(1);
1718   if (bol->as_Bool()->_test._test == BoolTest::ne &&
1719       cmpx->is_Cmp() && cmpx->in(2) == phase->intcon(0) &&
1720       cmpx->in(1)->is_g1_marking_load()) {
1721     return true;
1722   }
1723   return false;
1724 }
1725 
1726 #if INCLUDE_SHENANDOAHGC
1727 bool IfNode::is_shenandoah_marking_if(PhaseTransform *phase) const {
1728   if (!UseShenandoahGC) {
1729     return false;
1730   }
1731 
1732   if (Opcode() != Op_If) {
1733     return false;
1734   }
1735 
1736   Node* bol = in(1);
1737   assert(bol->is_Bool(), "");
1738   Node* cmpx = bol->in(1);
1739   if (bol->as_Bool()->_test._test == BoolTest::ne &&
1740       cmpx->is_Cmp() && cmpx->in(2) == phase->intcon(0) &&
1741       cmpx->in(1)->in(1)->is_shenandoah_state_load() &&
1742       cmpx->in(1)->in(2)->is_Con() &&
1743       cmpx->in(1)->in(2) == phase->intcon(ShenandoahHeap::MARKING)) {
1744     return true;
1745   }

1690   } else {
1691     // Cannot call transform on it just yet
1692     igvn->set_type_bottom(iff);
1693   }
1694   igvn->_worklist.push(iff);
1695 
1696   // Now handle projections.  Cloning not required.
1697   Node* new_if_f = (Node*)(new IfFalseNode( iff ));
1698   Node* new_if_t = (Node*)(new IfTrueNode ( iff ));
1699 
1700   igvn->register_new_node_with_optimizer(new_if_f);
1701   igvn->register_new_node_with_optimizer(new_if_t);
1702   // Flip test, so flip trailing control
1703   igvn->replace_node(old_if_f, new_if_t);
1704   igvn->replace_node(old_if_t, new_if_f);
1705 
1706   // Progress
1707   return iff;
1708 }
1709 
















1710 #if INCLUDE_SHENANDOAHGC
1711 bool IfNode::is_shenandoah_marking_if(PhaseTransform *phase) const {
1712   if (!UseShenandoahGC) {
1713     return false;
1714   }
1715 
1716   if (Opcode() != Op_If) {
1717     return false;
1718   }
1719 
1720   Node* bol = in(1);
1721   assert(bol->is_Bool(), "");
1722   Node* cmpx = bol->in(1);
1723   if (bol->as_Bool()->_test._test == BoolTest::ne &&
1724       cmpx->is_Cmp() && cmpx->in(2) == phase->intcon(0) &&
1725       cmpx->in(1)->in(1)->is_shenandoah_state_load() &&
1726       cmpx->in(1)->in(2)->is_Con() &&
1727       cmpx->in(1)->in(2) == phase->intcon(ShenandoahHeap::MARKING)) {
1728     return true;
1729   }