1 //==-- llvm/CodeGen/GlobalISel/Utils.h ---------------------------*- 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 declares the API of helper functions used throughout the 11 /// GlobalISel pipeline. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CODEGEN_GLOBALISEL_UTILS_H 16 #define LLVM_CODEGEN_GLOBALISEL_UTILS_H 17 18 #include "llvm/ADT/StringRef.h" 19 20 namespace llvm { 21 22 class MachineFunction; 23 class MachineInstr; 24 class MachineOptimizationRemarkEmitter; 25 class MachineOptimizationRemarkMissed; 26 class MachineRegisterInfo; 27 class MCInstrDesc; 28 class RegisterBankInfo; 29 class TargetInstrInfo; 30 class TargetPassConfig; 31 class TargetRegisterInfo; 32 class Twine; 33 class ConstantFP; 34 35 /// Try to constrain Reg so that it is usable by argument OpIdx of the 36 /// provided MCInstrDesc \p II. If this fails, create a new virtual 37 /// register in the correct class and insert a COPY before \p InsertPt. 38 /// The debug location of \p InsertPt is used for the new copy. 39 /// 40 /// \return The virtual register constrained to the right register class. 41 unsigned constrainOperandRegClass(const MachineFunction &MF, 42 const TargetRegisterInfo &TRI, 43 MachineRegisterInfo &MRI, 44 const TargetInstrInfo &TII, 45 const RegisterBankInfo &RBI, 46 MachineInstr &InsertPt, const MCInstrDesc &II, 47 unsigned Reg, unsigned OpIdx); 48 49 /// Check whether an instruction \p MI is dead: it only defines dead virtual 50 /// registers, and doesn't have other side effects. 51 bool isTriviallyDead(const MachineInstr &MI, const MachineRegisterInfo &MRI); 52 53 /// Report an ISel error as a missed optimization remark to the LLVMContext's 54 /// diagnostic stream. Set the FailedISel MachineFunction property. 55 void reportGISelFailure(MachineFunction &MF, const TargetPassConfig &TPC, 56 MachineOptimizationRemarkEmitter &MORE, 57 MachineOptimizationRemarkMissed &R); 58 59 void reportGISelFailure(MachineFunction &MF, const TargetPassConfig &TPC, 60 MachineOptimizationRemarkEmitter &MORE, 61 const char *PassName, StringRef Msg, 62 const MachineInstr &MI); 63 64 Optional<int64_t> getConstantVRegVal(unsigned VReg, 65 const MachineRegisterInfo &MRI); 66 const ConstantFP* getConstantFPVRegVal(unsigned VReg, 67 const MachineRegisterInfo &MRI); 68 69 } // End namespace llvm. 70 #endif 71
