1122   const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
1123   if (t2 == nullptr || !t2->klass_is_exact())
1124     return nullptr;
1125   // Get the constant klass we are comparing to.
1126   ciKlass* superklass = t2->exact_klass();
1127 
1128   // Now check for LoadKlass on left.
1129   Node* ldk1 = in(1);
1130   if (ldk1->is_DecodeNKlass()) {
1131     ldk1 = ldk1->in(1);
1132     if (ldk1->Opcode() != Op_LoadNKlass )
1133       return nullptr;
1134   } else if (ldk1->Opcode() != Op_LoadKlass )
1135     return nullptr;
1136   // Take apart the address of the LoadKlass:
1137   Node* adr1 = ldk1->in(MemNode::Address);
1138   intptr_t con2 = 0;
1139   Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
1140   if (ldk2 == nullptr)
1141     return nullptr;
1142   if (con2 == oopDesc::klass_offset_in_bytes()) {
1143     // We are inspecting an object's concrete class.
1144     // Short-circuit the check if the query is abstract.
1145     if (superklass->is_interface() ||
1146         superklass->is_abstract()) {
1147       // Make it come out always false:
1148       this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
1149       return this;
1150     }
1151   }
1152 
1153   // Check for a LoadKlass from primary supertype array.
1154   // Any nested loadklass from loadklass+con must be from the p.s. array.
1155   if (ldk2->is_DecodeNKlass()) {
1156     // Keep ldk2 as DecodeN since it could be used in CmpP below.
1157     if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
1158       return nullptr;
1159   } else if (ldk2->Opcode() != Op_LoadKlass)
1160     return nullptr;
1161 
1162   // Verify that we understand the situation

1122   const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
1123   if (t2 == nullptr || !t2->klass_is_exact())
1124     return nullptr;
1125   // Get the constant klass we are comparing to.
1126   ciKlass* superklass = t2->exact_klass();
1127 
1128   // Now check for LoadKlass on left.
1129   Node* ldk1 = in(1);
1130   if (ldk1->is_DecodeNKlass()) {
1131     ldk1 = ldk1->in(1);
1132     if (ldk1->Opcode() != Op_LoadNKlass )
1133       return nullptr;
1134   } else if (ldk1->Opcode() != Op_LoadKlass )
1135     return nullptr;
1136   // Take apart the address of the LoadKlass:
1137   Node* adr1 = ldk1->in(MemNode::Address);
1138   intptr_t con2 = 0;
1139   Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
1140   if (ldk2 == nullptr)
1141     return nullptr;
1142   if (con2 == Type::klass_offset()) {
1143     // We are inspecting an object's concrete class.
1144     // Short-circuit the check if the query is abstract.
1145     if (superklass->is_interface() ||
1146         superklass->is_abstract()) {
1147       // Make it come out always false:
1148       this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
1149       return this;
1150     }
1151   }
1152 
1153   // Check for a LoadKlass from primary supertype array.
1154   // Any nested loadklass from loadklass+con must be from the p.s. array.
1155   if (ldk2->is_DecodeNKlass()) {
1156     // Keep ldk2 as DecodeN since it could be used in CmpP below.
1157     if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
1158       return nullptr;
1159   } else if (ldk2->Opcode() != Op_LoadKlass)
1160     return nullptr;
1161 
1162   // Verify that we understand the situation