1 //===- MacroFusion.h - Macro Fusion -----------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file This file contains the definition of the DAG scheduling mutation to 10 /// pair instructions back to back. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CODEGEN_MACROFUSION_H 15 #define LLVM_CODEGEN_MACROFUSION_H 16 17 #include <functional> 18 #include <memory> 19 20 namespace llvm { 21 22 class MachineInstr; 23 class ScheduleDAGMutation; 24 class TargetInstrInfo; 25 class TargetSubtargetInfo; 26 27 /// Check if the instr pair, FirstMI and SecondMI, should be fused 28 /// together. Given SecondMI, when FirstMI is unspecified, then check if 29 /// SecondMI may be part of a fused pair at all. 30 using ShouldSchedulePredTy = std::function<bool(const TargetInstrInfo &TII, 31 const TargetSubtargetInfo &TSI, 32 const MachineInstr *FirstMI, 33 const MachineInstr &SecondMI)>; 34 35 /// Create a DAG scheduling mutation to pair instructions back to back 36 /// for instructions that benefit according to the target-specific 37 /// shouldScheduleAdjacent predicate function. 38 std::unique_ptr<ScheduleDAGMutation> 39 createMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent); 40 41 /// Create a DAG scheduling mutation to pair branch instructions with one 42 /// of their predecessors back to back for instructions that benefit according 43 /// to the target-specific shouldScheduleAdjacent predicate function. 44 std::unique_ptr<ScheduleDAGMutation> 45 createBranchMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent); 46 47 } // end namespace llvm 48 49 #endif // LLVM_CODEGEN_MACROFUSION_H 50