| //===- 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 |
