src/cpu/x86/vm/vm_version_x86.hpp

rev 10065 : 8147844: new method j.l.Runtime.onSpinWait() and the corresponding x86 hotspot instrinsic
Summary: adds c1 & c2 x86 intrinsics for j.l.Runtime.onSpinWait() that utilize the 'pause' instruction
Contributed-by: ikrylov, ygaevsky
Reviewed-by: iveresov, vlivanov, kvn

*** 837,844 ****
--- 837,849 ----
      return _cpuid_info.xem_xcr0_eax.value;
    }
    static uint32_t get_xsave_header_upper_segment() {
      return _cpuid_info.xem_xcr0_edx;
    }
+   
+   // SSE2 and later processors implement a 'pause' instruction 
+   // that can be used for efficient implementation of 
+   // the intrinsic for java.lang.Runtime.onSpinWait() 
+   static bool supports_on_spin_wait() { return supports_sse2(); }
  };
  
  #endif // CPU_X86_VM_VM_VERSION_X86_HPP