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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- ConstantMerge.h - Merge duplicate global constants -------*- 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 defines the interface to a pass that merges duplicate global |
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| 10 | // constants together into a single constant that is shared. This is useful |
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| 11 | // because some passes (ie TraceValues) insert a lot of string constants into |
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| 12 | // the program, regardless of whether or not an existing string is available. |
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| 13 | // |
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| 14 | // Algorithm: ConstantMerge is designed to build up a map of available constants |
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| 15 | // and eliminate duplicates when it is initialized. |
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| 16 | // |
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| 17 | //===----------------------------------------------------------------------===// |
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| 18 | |||
| 19 | #ifndef LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |
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| 20 | #define LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |
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| 21 | |||
| 22 | #include "llvm/IR/PassManager.h" |
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| 23 | |||
| 24 | namespace llvm { |
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| 25 | |||
| 26 | class Module; |
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| 27 | |||
| 28 | /// A pass that merges duplicate global constants into a single constant. |
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| 29 | class ConstantMergePass : public PassInfoMixin<ConstantMergePass> { |
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| 30 | public: |
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| 31 | PreservedAnalyses run(Module &M, ModuleAnalysisManager &); |
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| 32 | }; |
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| 33 | |||
| 34 | } // end namespace llvm |
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| 35 | |||
| 36 | #endif // LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |