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//===-- llvm/MC/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_MC_REGISTER_H
#define LLVM_MC_REGISTER_H
#include "llvm/ADT/DenseMapInfo.h"
#include <cassert>
namespace llvm {
/// An unsigned integer type large enough to represent all physical registers,
/// but not necessarily virtual registers.
using MCPhysReg = uint16_t;
/// Wrapper class representing physical registers. Should be passed by value.
class MCRegister {
unsigned Reg;
public:
MCRegister(unsigned Val = 0): Reg(Val) {}
// Register numbers can represent physical registers, virtual registers, and
// sometimes stack slots. The unsigned values are divided into these ranges:
//
// 0 Not a register, can be used as a sentinel.
// [1;2^30) Physical registers assigned by TableGen.
// [2^30;2^31) Stack slots. (Rarely used.)
// [2^31;2^32) Virtual registers assigned by MachineRegisterInfo.
//
// Further sentinels can be allocated from the small negative integers.
// DenseMapInfo<unsigned> uses -1u and -2u.
/// This is the portion of the positive number space that is not a physical
/// register. StackSlot values do not exist in the MC layer, see
/// Register::isStackSlot() for the more information on them.
///
/// Note that isVirtualRegister() and isPhysicalRegister() cannot handle stack
/// slots, so if a variable may contains a stack slot, always check
/// isStackSlot() first.
static bool isStackSlot(unsigned Reg) {
return int(Reg) >= (1 << 30);
}
/// Return true if the specified register number is in
/// the physical register namespace.
static bool isPhysicalRegister(unsigned Reg) {
assert(!isStackSlot(Reg) && "Not a register! Check isStackSlot() first.");
return int(Reg) > 0;
}
/// Return true if the specified register number is in the physical register
/// namespace.
bool isPhysical() const {
return isPhysicalRegister(Reg);
}
operator unsigned() const {
return Reg;
}
unsigned id() const {
return Reg;
}
bool isValid() const {
return Reg != 0;
}
/// Comparisons between register objects
bool operator==(const MCRegister &Other) const { return Reg == Other.Reg; }
bool operator!=(const MCRegister &Other) const { return Reg != Other.Reg; }
/// Comparisons against register constants. E.g.
/// * R == AArch64::WZR
/// * R == 0
/// * R == VirtRegMap::NO_PHYS_REG
bool operator==(unsigned Other) const { return Reg == Other; }
bool operator!=(unsigned Other) const { return Reg != Other; }
bool operator==(int Other) const { return Reg == unsigned(Other); }
bool operator!=(int Other) const { return Reg != unsigned(Other); }
// MSVC requires that we explicitly declare these two as well.
bool operator==(MCPhysReg Other) const { return Reg == unsigned(Other); }
bool operator!=(MCPhysReg Other) const { return Reg != unsigned(Other); }
};
// Provide DenseMapInfo for MCRegister
template<> struct DenseMapInfo<MCRegister> {
static inline unsigned getEmptyKey() {
return DenseMapInfo<unsigned>::getEmptyKey();
}
static inline unsigned getTombstoneKey() {
return DenseMapInfo<unsigned>::getTombstoneKey();
}
static unsigned getHashValue(const MCRegister &Val) {
return DenseMapInfo<unsigned>::getHashValue(Val.id());
}
static bool isEqual(const MCRegister &LHS, const MCRegister &RHS) {
return DenseMapInfo<unsigned>::isEqual(LHS.id(), RHS.id());
}
};
}
#endif // ifndef LLVM_MC_REGISTER_H
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