| 1 | //===---- BDCE.cpp - Bit-tracking dead code elimination ---------*- C++ -*-===// |
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| 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 the Bit-Tracking Dead Code Elimination pass. Some |
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| 10 | // instructions (shifts, some ands, ors, etc.) kill some of their input bits. |
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| 11 | // We track these dead bits and remove instructions that compute only these |
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| 12 | // dead bits. |
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| 13 | // |
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| 14 | //===----------------------------------------------------------------------===// |
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| 15 | |
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| 16 | #ifndef LLVM_TRANSFORMS_SCALAR_BDCE_H |
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| 17 | #define LLVM_TRANSFORMS_SCALAR_BDCE_H |
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| 18 | |
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| 19 | #include "llvm/IR/PassManager.h" |
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| 20 | |
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| 21 | namespace llvm { |
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| 22 | |
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| 23 | class Function; |
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| 24 | |
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| 25 | // The Bit-Tracking Dead Code Elimination pass. |
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| 26 | struct BDCEPass : PassInfoMixin<BDCEPass> { |
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| 27 | PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); |
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| 28 | }; |
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| 29 | } |
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| 30 | |
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| 31 | #endif // LLVM_TRANSFORMS_SCALAR_BDCE_H |
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| 32 | |
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