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a8d946115e
In Thumb 1, with the new ADDCARRY / SUBCARRY the scheduler may need to do copies CPSR ↔ GPR but not all Thumb1 targets implement them. The schedule can attempt, before attempting a copy, to clone the instructions but it does not currently do that for nodes with input glue. In this patch we introduce a target-hook to let the hook decide if a glued machinenode is still eligible for copying. In this case these are ARM::tADCS and ARM::tSBCS . As a follow-up of this change we should actually implement the copies for the Thumb1 targets that do implement them and restrict the hook to the targets that can't really do such copy as these clones are not ideal. This change fixes PR35836. Differential Revision: https://reviews.llvm.org/D42051 llvm-svn: 323857
63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
//===-- Thumb1InstrInfo.h - Thumb-1 Instruction Information -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Thumb-1 implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_THUMB1INSTRINFO_H
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#define LLVM_LIB_TARGET_ARM_THUMB1INSTRINFO_H
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#include "ARMBaseInstrInfo.h"
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#include "ThumbRegisterInfo.h"
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namespace llvm {
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class ARMSubtarget;
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class Thumb1InstrInfo : public ARMBaseInstrInfo {
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ThumbRegisterInfo RI;
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public:
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explicit Thumb1InstrInfo(const ARMSubtarget &STI);
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/// Return the noop instruction to use for a noop.
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void getNoop(MCInst &NopInst) const override;
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// Return the non-pre/post incrementing version of 'Opc'. Return 0
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// if there is not such an opcode.
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unsigned getUnindexedOpcode(unsigned Opc) const override;
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/// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
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/// such, whenever a client has an instance of instruction info, it should
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/// always be able to get register info as well (through this method).
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///
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const ThumbRegisterInfo &getRegisterInfo() const override { return RI; }
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void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
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const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
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bool KillSrc) const override;
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void storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned SrcReg, bool isKill, int FrameIndex,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const override;
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void loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned DestReg, int FrameIndex,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const override;
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bool canCopyGluedNodeDuringSchedule(SDNode *N) const override;
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private:
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void expandLoadStackGuard(MachineBasicBlock::iterator MI) const override;
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};
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}
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#endif
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