src/hotspot/cpu/aarch64/register_aarch64.hpp

@@ -71,10 +71,15 @@
  
    int operator==(const Register r) const { return _encoding == r._encoding; }
    int operator!=(const Register r) const { return _encoding != r._encoding; }
  
    constexpr const RegisterImpl* operator->() const { return RegisterImpl::first() + _encoding; }
+ 
+   // Actually available GP registers for use, depending on actual CPU capabilities and flags.
+   static int available_gp_registers() {
+     return number_of_registers;
+   }
  };
  
  extern Register::RegisterImpl all_RegisterImpls[Register::number_of_declared_registers + 1] INTERNAL_VISIBILITY;
  
  inline constexpr const Register::RegisterImpl* Register::RegisterImpl::first() {