860 }
861 }
862 }
863
864 // Known constants can be compared exactly
865 // Null can be distinguished from any NotNull pointers
866 // Unknown inputs makes an unknown result
867 if( r0->singleton() ) {
868 intptr_t bits0 = r0->get_con();
869 if( r1->singleton() )
870 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
871 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
872 } else if( r1->singleton() ) {
873 intptr_t bits1 = r1->get_con();
874 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
875 } else
876 return TypeInt::CC;
877 }
878
879 static inline Node* isa_java_mirror_load(PhaseGVN* phase, Node* n) {
880 // Return the klass node for
881 // LoadP(AddP(foo:Klass, #java_mirror))
882 // or NULL if not matching.
883 if (n->Opcode() != Op_LoadP) return NULL;
884
885 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
886 if (!tp || tp->klass() != phase->C->env()->Class_klass()) return NULL;
887
888 Node* adr = n->in(MemNode::Address);
889 intptr_t off = 0;
890 Node* k = AddPNode::Ideal_base_and_offset(adr, phase, off);
891 if (k == NULL) return NULL;
892 const TypeKlassPtr* tkp = phase->type(k)->isa_klassptr();
893 if (!tkp || off != in_bytes(Klass::java_mirror_offset())) return NULL;
894
895 // We've found the klass node of a Java mirror load.
896 return k;
897 }
898
899 static inline Node* isa_const_java_mirror(PhaseGVN* phase, Node* n) {
900 // for ConP(Foo.class) return ConP(Foo.klass)
901 // otherwise return NULL
902 if (!n->is_Con()) return NULL;
903
904 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
905 if (!tp) return NULL;
906
907 ciType* mirror_type = tp->java_mirror_type();
908 // TypeInstPtr::java_mirror_type() returns non-NULL for compile-
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860 }
861 }
862 }
863
864 // Known constants can be compared exactly
865 // Null can be distinguished from any NotNull pointers
866 // Unknown inputs makes an unknown result
867 if( r0->singleton() ) {
868 intptr_t bits0 = r0->get_con();
869 if( r1->singleton() )
870 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
871 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
872 } else if( r1->singleton() ) {
873 intptr_t bits1 = r1->get_con();
874 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
875 } else
876 return TypeInt::CC;
877 }
878
879 static inline Node* isa_java_mirror_load(PhaseGVN* phase, Node* n) {
880 // Return the klass node for (indirect load from OopHandle)
881 // LoadP(LoadP(AddP(foo:Klass, #java_mirror)))
882 // or NULL if not matching.
883 if (n->Opcode() != Op_LoadP) return NULL;
884
885 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
886 if (!tp || tp->klass() != phase->C->env()->Class_klass()) return NULL;
887
888 Node* adr = n->in(MemNode::Address);
889 // First load from OopHandle
890 if (adr->Opcode() != Op_LoadP || !phase->type(adr)->isa_rawptr()) return NULL;
891 adr = adr->in(MemNode::Address);
892
893 intptr_t off = 0;
894 Node* k = AddPNode::Ideal_base_and_offset(adr, phase, off);
895 if (k == NULL) return NULL;
896 const TypeKlassPtr* tkp = phase->type(k)->isa_klassptr();
897 if (!tkp || off != in_bytes(Klass::java_mirror_offset())) return NULL;
898
899 // We've found the klass node of a Java mirror load.
900 return k;
901 }
902
903 static inline Node* isa_const_java_mirror(PhaseGVN* phase, Node* n) {
904 // for ConP(Foo.class) return ConP(Foo.klass)
905 // otherwise return NULL
906 if (!n->is_Con()) return NULL;
907
908 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
909 if (!tp) return NULL;
910
911 ciType* mirror_type = tp->java_mirror_type();
912 // TypeInstPtr::java_mirror_type() returns non-NULL for compile-
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