1 //===- MacroFusion.h - Macro Fusion -----------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 /// \file This file contains the definition of the DAG scheduling mutation to 11 /// pair instructions back to back. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CODEGEN_MACROFUSION_H 16 #define LLVM_CODEGEN_MACROFUSION_H 17 18 #include <functional> 19 #include <memory> 20 21 namespace llvm { 22 23 class MachineInstr; 24 class ScheduleDAGMutation; 25 class TargetInstrInfo; 26 class TargetSubtargetInfo; 27 28 /// \brief Check if the instr pair, FirstMI and SecondMI, should be fused 29 /// together. Given SecondMI, when FirstMI is unspecified, then check if 30 /// SecondMI may be part of a fused pair at all. 31 using ShouldSchedulePredTy = std::function<bool(const TargetInstrInfo &TII, 32 const TargetSubtargetInfo &TSI, 33 const MachineInstr *FirstMI, 34 const MachineInstr &SecondMI)>; 35 36 /// \brief Create a DAG scheduling mutation to pair instructions back to back 37 /// for instructions that benefit according to the target-specific 38 /// shouldScheduleAdjacent predicate function. 39 std::unique_ptr<ScheduleDAGMutation> 40 createMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent); 41 42 /// \brief Create a DAG scheduling mutation to pair branch instructions with one 43 /// of their predecessors back to back for instructions that benefit according 44 /// to the target-specific shouldScheduleAdjacent predicate function. 45 std::unique_ptr<ScheduleDAGMutation> 46 createBranchMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent); 47 48 } // end namespace llvm 49 50 #endif // LLVM_CODEGEN_MACROFUSION_H 51
