1183   const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
1184   if (t2 == nullptr || !t2->klass_is_exact())
1185     return nullptr;
1186   // Get the constant klass we are comparing to.
1187   ciKlass* superklass = t2->exact_klass();
1188 
1189   // Now check for LoadKlass on left.
1190   Node* ldk1 = in(1);
1191   if (ldk1->is_DecodeNKlass()) {
1192     ldk1 = ldk1->in(1);
1193     if (ldk1->Opcode() != Op_LoadNKlass )
1194       return nullptr;
1195   } else if (ldk1->Opcode() != Op_LoadKlass )
1196     return nullptr;
1197   // Take apart the address of the LoadKlass:
1198   Node* adr1 = ldk1->in(MemNode::Address);
1199   intptr_t con2 = 0;
1200   Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
1201   if (ldk2 == nullptr)
1202     return nullptr;
1203   if (con2 == oopDesc::klass_offset_in_bytes()) {
1204     // We are inspecting an object's concrete class.
1205     // Short-circuit the check if the query is abstract.
1206     if (superklass->is_interface() ||
1207         superklass->is_abstract()) {
1208       // Make it come out always false:
1209       this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
1210       return this;
1211     }
1212   }
1213 
1214   // Check for a LoadKlass from primary supertype array.
1215   // Any nested loadklass from loadklass+con must be from the p.s. array.
1216   if (ldk2->is_DecodeNKlass()) {
1217     // Keep ldk2 as DecodeN since it could be used in CmpP below.
1218     if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
1219       return nullptr;
1220   } else if (ldk2->Opcode() != Op_LoadKlass)
1221     return nullptr;
1222 
1223   // Verify that we understand the situation

1183   const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
1184   if (t2 == nullptr || !t2->klass_is_exact())
1185     return nullptr;
1186   // Get the constant klass we are comparing to.
1187   ciKlass* superklass = t2->exact_klass();
1188 
1189   // Now check for LoadKlass on left.
1190   Node* ldk1 = in(1);
1191   if (ldk1->is_DecodeNKlass()) {
1192     ldk1 = ldk1->in(1);
1193     if (ldk1->Opcode() != Op_LoadNKlass )
1194       return nullptr;
1195   } else if (ldk1->Opcode() != Op_LoadKlass )
1196     return nullptr;
1197   // Take apart the address of the LoadKlass:
1198   Node* adr1 = ldk1->in(MemNode::Address);
1199   intptr_t con2 = 0;
1200   Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
1201   if (ldk2 == nullptr)
1202     return nullptr;
1203   if (con2 == Type::klass_offset()) {
1204     // We are inspecting an object's concrete class.
1205     // Short-circuit the check if the query is abstract.
1206     if (superklass->is_interface() ||
1207         superklass->is_abstract()) {
1208       // Make it come out always false:
1209       this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
1210       return this;
1211     }
1212   }
1213 
1214   // Check for a LoadKlass from primary supertype array.
1215   // Any nested loadklass from loadklass+con must be from the p.s. array.
1216   if (ldk2->is_DecodeNKlass()) {
1217     // Keep ldk2 as DecodeN since it could be used in CmpP below.
1218     if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
1219       return nullptr;
1220   } else if (ldk2->Opcode() != Op_LoadKlass)
1221     return nullptr;
1222 
1223   // Verify that we understand the situation