//===- llvm/Support/DivisionByConstantInfo.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
//
//===----------------------------------------------------------------------===//
///
/// This file implements support for optimizing divisions by a constant
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_DIVISIONBYCONSTANTINFO_H
#define LLVM_SUPPORT_DIVISIONBYCONSTANTINFO_H
#include "llvm/ADT/APInt.h"
namespace llvm {
/// Magic data for optimising signed division by a constant.
struct SignedDivisionByConstantInfo {
static SignedDivisionByConstantInfo get(const APInt &D);
APInt Magic; ///< magic number
unsigned ShiftAmount; ///< shift amount
};
/// Magic data for optimising unsigned division by a constant.
struct UnsignedDivisionByConstantInfo {
static UnsignedDivisionByConstantInfo
get(const APInt &D, unsigned LeadingZeros = 0,
bool AllowEvenDivisorOptimization = true);
APInt Magic; ///< magic number
bool IsAdd; ///< add indicator
unsigned PostShift; ///< post-shift amount
unsigned PreShift; ///< pre-shift amount
};
} // namespace llvm
#endif