| //===- ConstantMerge.h - Merge duplicate global constants -------*- 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 defines the interface to a pass that merges duplicate global |
| // constants together into a single constant that is shared. This is useful |
| // because some passes (ie TraceValues) insert a lot of string constants into |
| // the program, regardless of whether or not an existing string is available. |
| // |
| // Algorithm: ConstantMerge is designed to build up a map of available constants |
| // and eliminate duplicates when it is initialized. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |
| #define LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |
| |
| #include "llvm/IR/PassManager.h" |
| |
| namespace llvm { |
| |
| class Module; |
| |
| /// A pass that merges duplicate global constants into a single constant. |
| class ConstantMergePass : public PassInfoMixin<ConstantMergePass> { |
| public: |
| PreservedAnalyses run(Module &M, ModuleAnalysisManager &); |
| }; |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |
