1 //===- llvm/CodeGen/GlobalISel/InstructionSelector.h ------------*- 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 declares the API for the instruction selector. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H 14 #define LLVM_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H 15 16 #include "llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h" 17 18 namespace llvm { 19 class InstructionSelector : public GIMatchTableExecutor { 20 public: 21 virtual ~InstructionSelector(); 22 23 /// Select the (possibly generic) instruction \p I to only use target-specific 24 /// opcodes. It is OK to insert multiple instructions, but they cannot be 25 /// generic pre-isel instructions. 26 /// 27 /// \returns whether selection succeeded. 28 /// \pre I.getParent() && I.getParent()->getParent() 29 /// \post 30 /// if returns true: 31 /// for I in all mutated/inserted instructions: 32 /// !isPreISelGenericOpcode(I.getOpcode()) 33 virtual bool select(MachineInstr &I) = 0; 34 }; 35 } // namespace llvm 36 37 #endif 38