| //===-- llvm/CodeGen/Register.h ---------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CODEGEN_REGISTER_H |
| #define LLVM_CODEGEN_REGISTER_H |
| |
| #include <cassert> |
| |
| namespace llvm { |
| |
| /// Wrapper class representing virtual and physical registers. Should be passed |
| /// by value. |
| class Register { |
| unsigned Reg; |
| |
| public: |
| Register(unsigned Val = 0): Reg(Val) {} |
| |
| /// Return true if the specified register number is in the virtual register |
| /// namespace. |
| bool isVirtual() const { |
| return int(Reg) < 0; |
| } |
| |
| /// Return true if the specified register number is in the physical register |
| /// namespace. |
| bool isPhysical() const { |
| return int(Reg) > 0; |
| } |
| |
| /// Convert a virtual register number to a 0-based index. The first virtual |
| /// register in a function will get the index 0. |
| unsigned virtRegIndex() const { |
| assert(isVirtual() && "Not a virtual register"); |
| return Reg & ~(1u << 31); |
| } |
| |
| /// Convert a 0-based index to a virtual register number. |
| /// This is the inverse operation of VirtReg2IndexFunctor below. |
| static Register index2VirtReg(unsigned Index) { |
| return Register(Index | (1u << 31)); |
| } |
| |
| operator unsigned() const { |
| return Reg; |
| } |
| |
| bool isValid() const { |
| return Reg != 0; |
| } |
| }; |
| |
| } |
| |
| #endif |