llvm/llvm/include/llvm/ADT/APFixedPoint.h

//===- APFixedPoint.h - Fixed point constant handling -----------*- 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
/// Defines the fixed point number interface.
/// This is a class for abstracting various operations performed on fixed point
/// types.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_APFIXEDPOINT_H
#define LLVM_ADT_APFIXEDPOINT_H

#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"

namespace llvm {

class APFloat;
struct fltSemantics;

/// The fixed point semantics work similarly to fltSemantics. The width
/// specifies the whole bit width of the underlying scaled integer (with padding
/// if any). The scale represents the number of fractional bits in this type.
/// When HasUnsignedPadding is true and this type is unsigned, the first bit
/// in the value this represents is treated as padding.
class FixedPointSemantics { … };

static_assert …;

inline hash_code hash_value(const FixedPointSemantics &Val) { … }

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

/// The APFixedPoint class works similarly to APInt/APSInt in that it is a
/// functional replacement for a scaled integer. It supports a wide range of
/// semantics including the one used by fixed point types proposed in ISO/IEC
/// JTC1 SC22 WG14 N1169. The class carries the value and semantics of
/// a fixed point, and provides different operations that would normally be
/// performed on fixed point types.
class APFixedPoint { … };

inline raw_ostream &operator<<(raw_ostream &OS, const APFixedPoint &FX) { … }

inline hash_code hash_value(const APFixedPoint &Val) { … }

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

} // namespace llvm

#endif