src/cpu/x86/vm/c1_FrameMap_x86.hpp

*** 124,128 ****
--- 124,140 ----
  
    static LIR_Opr caller_save_xmm_reg_at(int i) {
      assert(i >= 0 && i < nof_caller_save_xmm_regs, "out of bounds");
      return _caller_save_xmm_regs[i];
    }
+ 
+   // The amount of allocatable registers can change depending
+   // on whether compressed oops are on.
+   static int cpu_reg_range_reduction() {
+ #ifdef _LP64
+     if (UseCompressedOops) {
+       // Reducing the allocatable range by 1 effectively excluding r12.
+       return 1;
+     }
+ #endif
+     return 0;
+   }