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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- llvm/Support/DivisionByConstantInfo.h ---------------------*- C++ -*-==// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | /// |
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| 9 | /// This file implements support for optimizing divisions by a constant |
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| 10 | /// |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_SUPPORT_DIVISIONBYCONSTANTINFO_H |
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| 14 | #define LLVM_SUPPORT_DIVISIONBYCONSTANTINFO_H |
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| 15 | |||
| 16 | #include "llvm/ADT/APInt.h" |
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| 17 | |||
| 18 | namespace llvm { |
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| 19 | |||
| 20 | /// Magic data for optimising signed division by a constant. |
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| 21 | struct SignedDivisionByConstantInfo { |
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| 22 | static SignedDivisionByConstantInfo get(const APInt &D); |
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| 23 | APInt Magic; ///< magic number |
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| 24 | unsigned ShiftAmount; ///< shift amount |
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| 25 | }; |
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| 26 | |||
| 27 | /// Magic data for optimising unsigned division by a constant. |
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| 28 | struct UnsignedDivisionByConstantInfo { |
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| 29 | static UnsignedDivisionByConstantInfo |
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| 30 | get(const APInt &D, unsigned LeadingZeros = 0, |
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| 31 | bool AllowEvenDivisorOptimization = true); |
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| 32 | APInt Magic; ///< magic number |
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| 33 | bool IsAdd; ///< add indicator |
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| 34 | unsigned PostShift; ///< post-shift amount |
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| 35 | unsigned PreShift; ///< pre-shift amount |
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| 36 | }; |
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| 37 | |||
| 38 | } // namespace llvm |
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| 39 | |||
| 40 | #endif |