109   static LIR_Opr as_long_opr(Register r, Register r2) {
 110     return LIR_OprFact::double_cpu(cpu_reg2rnr(r), cpu_reg2rnr(r2));
 111   }
 112   static LIR_Opr as_pointer_opr(Register r) {
 113     return LIR_OprFact::single_cpu(cpu_reg2rnr(r));
 114   }
 115 #endif // _LP64
 116 
 117   // VMReg name for spilled physical FPU stack slot n
 118   static VMReg fpu_regname (int n);
 119 
 120   static XMMRegister nr2xmmreg(int rnr);
 121 
 122   static bool is_caller_save_register (LIR_Opr opr) { return true; }
 123   static bool is_caller_save_register (Register r) { return true; }
 124 
 125   static LIR_Opr caller_save_xmm_reg_at(int i) {
 126     assert(i >= 0 && i < nof_caller_save_xmm_regs, "out of bounds");
 127     return _caller_save_xmm_regs[i];
 128   }

 109   static LIR_Opr as_long_opr(Register r, Register r2) {
 110     return LIR_OprFact::double_cpu(cpu_reg2rnr(r), cpu_reg2rnr(r2));
 111   }
 112   static LIR_Opr as_pointer_opr(Register r) {
 113     return LIR_OprFact::single_cpu(cpu_reg2rnr(r));
 114   }
 115 #endif // _LP64
 116 
 117   // VMReg name for spilled physical FPU stack slot n
 118   static VMReg fpu_regname (int n);
 119 
 120   static XMMRegister nr2xmmreg(int rnr);
 121 
 122   static bool is_caller_save_register (LIR_Opr opr) { return true; }
 123   static bool is_caller_save_register (Register r) { return true; }
 124 
 125   static LIR_Opr caller_save_xmm_reg_at(int i) {
 126     assert(i >= 0 && i < nof_caller_save_xmm_regs, "out of bounds");
 127     return _caller_save_xmm_regs[i];
 128   }
 129 
 130   // The amount of allocatable registers can change depending
 131   // on whether compressed oops are on.
 132   static int cpu_reg_range_reduction() {
 133 #ifdef _LP64
 134     if (UseCompressedOops) {
 135       // Reducing the allocatable range by 1 effectively excluding r12.
 136       return 1;
 137     }
 138 #endif
 139     return 0;
 140   }