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Diffstat (limited to 'include/llvm/Transforms/IPO/ConstantMerge.h')
-rw-r--r-- | include/llvm/Transforms/IPO/ConstantMerge.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/llvm/Transforms/IPO/ConstantMerge.h b/include/llvm/Transforms/IPO/ConstantMerge.h new file mode 100644 index 000000000000..1d4da43f6a7b --- /dev/null +++ b/include/llvm/Transforms/IPO/ConstantMerge.h @@ -0,0 +1,35 @@ +//===- ConstantMerge.h - Merge duplicate global constants -------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// 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/Module.h" +#include "llvm/IR/PassManager.h" + +namespace llvm { + +/// A pass that merges duplicate global constants into a single constant. +class ConstantMergePass : public PassInfoMixin<ConstantMergePass> { +public: + PreservedAnalyses run(Module &M, ModuleAnalysisManager &); +}; +} + +#endif // LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H |