src/share/vm/opto/subnode.cpp

rev 3688 : 7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by:

*** 787,797 ****
    // Get the constant klass we are comparing to.
    ciKlass* superklass = t2->klass();
  
    // Now check for LoadKlass on left.
    Node* ldk1 = in(1);
!   if (ldk1->is_DecodeN()) {
      ldk1 = ldk1->in(1);
      if (ldk1->Opcode() != Op_LoadNKlass )
        return NULL;
    } else if (ldk1->Opcode() != Op_LoadKlass )
      return NULL;
--- 787,797 ----
    // Get the constant klass we are comparing to.
    ciKlass* superklass = t2->klass();
  
    // Now check for LoadKlass on left.
    Node* ldk1 = in(1);
!   if (ldk1->is_DecodeNKlass()) {
      ldk1 = ldk1->in(1);
      if (ldk1->Opcode() != Op_LoadNKlass )
        return NULL;
    } else if (ldk1->Opcode() != Op_LoadKlass )
      return NULL;
*** 812,822 ****
      }
    }
  
    // Check for a LoadKlass from primary supertype array.
    // Any nested loadklass from loadklass+con must be from the p.s. array.
!   if (ldk2->is_DecodeN()) {
      // Keep ldk2 as DecodeN since it could be used in CmpP below.
      if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
        return NULL;
    } else if (ldk2->Opcode() != Op_LoadKlass)
      return NULL;
--- 812,822 ----
      }
    }
  
    // Check for a LoadKlass from primary supertype array.
    // Any nested loadklass from loadklass+con must be from the p.s. array.
!   if (ldk2->is_DecodeNKlass()) {
      // Keep ldk2 as DecodeN since it could be used in CmpP below.
      if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
        return NULL;
    } else if (ldk2->Opcode() != Op_LoadKlass)
      return NULL;