42389377d8
This new attribute aims to control the enablement of 32-bit subregister support on eBPF backend. Name the interface as "alu32" is because we in particular want to enable the generation of BPF_ALU32 instructions by enable subregister support. This attribute could be used in the following format with llc: llc -mtriple=bpf -mattr=[+|-]alu32 It is disabled at default. Signed-off-by: Jiong Wang <jiong.wang@netronome.com> Reviewed-by: Yonghong Song <yhs@fb.com> llvm-svn: 325982
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===-- BPFSubtarget.h - Define Subtarget for the BPF -----------*- 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 declares the BPF specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
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#define LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
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#include "BPFFrameLowering.h"
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#include "BPFISelLowering.h"
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#include "BPFInstrInfo.h"
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#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/Target/TargetMachine.h"
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#define GET_SUBTARGETINFO_HEADER
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#include "BPFGenSubtargetInfo.inc"
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namespace llvm {
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class StringRef;
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class BPFSubtarget : public BPFGenSubtargetInfo {
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virtual void anchor();
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BPFInstrInfo InstrInfo;
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BPFFrameLowering FrameLowering;
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BPFTargetLowering TLInfo;
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SelectionDAGTargetInfo TSInfo;
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private:
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void initializeEnvironment();
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void initSubtargetFeatures(StringRef CPU, StringRef FS);
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bool probeJmpExt();
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protected:
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// unused
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bool isDummyMode;
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// whether the cpu supports jmp ext
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bool HasJmpExt;
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// whether the cpu supports alu32 instructions.
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bool HasAlu32;
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public:
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// This constructor initializes the data members to match that
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// of the specified triple.
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BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
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const TargetMachine &TM);
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BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
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// ParseSubtargetFeatures - Parses features string setting specified
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// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
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bool getHasJmpExt() const { return HasJmpExt; }
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bool getHasAlu32() const { return HasAlu32; }
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const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
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const BPFFrameLowering *getFrameLowering() const override {
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return &FrameLowering;
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}
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const BPFTargetLowering *getTargetLowering() const override {
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return &TLInfo;
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}
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const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
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return &TSInfo;
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}
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const TargetRegisterInfo *getRegisterInfo() const override {
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return &InstrInfo.getRegisterInfo();
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}
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};
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} // End llvm namespace
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#endif
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