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//===- llvm/CodeGen/GlobalMerge.h -------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_GLOBALMERGE_H
#define LLVM_CODEGEN_GLOBALMERGE_H
#include "llvm/IR/PassManager.h"
namespace llvm {
class TargetMachine;
struct GlobalMergeOptions {
// FIXME: Infer the maximum possible offset depending on the actual users
// (these max offsets are different for the users inside Thumb or ARM
// functions), see the code that passes in the offset in the ARM backend
// for more information.
unsigned MaxOffset = 0;
// The minimum size in bytes of each global that should considered in merging.
unsigned MinSize = 0;
bool GroupByUse = true;
bool IgnoreSingleUse = true;
bool MergeConst = false;
/// Whether we should merge global variables that have external linkage.
bool MergeExternal = true;
/// Whether we should try to optimize for size only.
/// Currently, this applies a dead simple heuristic: only consider globals
/// used in minsize functions for merging.
/// FIXME: This could learn about optsize, and be used in the cost model.
bool SizeOnly = false;
};
// FIXME: This pass must run before AsmPrinterPass::doInitialization!
class GlobalMergePass : public PassInfoMixin<GlobalMergePass> {
const TargetMachine *TM;
GlobalMergeOptions Options;
public:
GlobalMergePass(const TargetMachine *TM, GlobalMergeOptions Options)
: TM(TM), Options(Options) {}
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
};
} // namespace llvm
#endif // LLVM_CODEGEN_GLOBALMERGE_H
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