llvm/llvm/include/llvm/CodeGenTypes/LowLevelType.h

//== llvm/CodeGenTypes/LowLevelType.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
//
//===----------------------------------------------------------------------===//
/// \file
/// Implement a low-level type suitable for MachineInstr level instruction
/// selection.
///
/// For a type attached to a MachineInstr, we only care about 2 details: total
/// size and the number of vector lanes (if any). Accordingly, there are 4
/// possible valid type-kinds:
///
///    * `sN` for scalars and aggregates
///    * `<N x sM>` for vectors, which must have at least 2 elements.
///    * `pN` for pointers
///
/// Other information required for correct selection is expected to be carried
/// by the opcode, or non-type flags. For example the distinction between G_ADD
/// and G_FADD for int/float or fast-math flags.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_LOWLEVELTYPE_H
#define LLVM_CODEGEN_LOWLEVELTYPE_H

#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/Support/Debug.h"
#include <cassert>

namespace llvm {

class Type;
class raw_ostream;

class LLT { … };

inline raw_ostream& operator<<(raw_ostream &OS, const LLT &Ty) { … }

template<> struct DenseMapInfo<LLT> { … };

}

#endif // LLVM_CODEGEN_LOWLEVELTYPE_H