mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-20 03:23:01 +02:00
1bc276c3c4
JMP32 instructions has been added to eBPF ISA. They are 32-bit variants of existing BPF conditional jump instructions, but the comparison happens on low 32-bit sub-register only, therefore some unnecessary extensions could be saved. JMP32 instructions will only be available for -mcpu=v3. Host probe hook has been updated accordingly. JMP32 instructions will only be enabled in code-gen when -mattr=+alu32 enabled, meaning compiling the program using sub-register mode. For JMP32 encoding, it is a new instruction class, and is using the reserved eBPF class number 0x6. This patch has been tested by compiling and running kernel bpf selftests with JMP32 enabled. Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Jiong Wang <jiong.wang@netronome.com> llvm-svn: 353384
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
//===-- BPFSubtarget.h - Define Subtarget for the BPF -----------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the BPF specific subclass of TargetSubtargetInfo.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
|
|
#define LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
|
|
|
|
#include "BPFFrameLowering.h"
|
|
#include "BPFISelLowering.h"
|
|
#include "BPFInstrInfo.h"
|
|
#include "BPFSelectionDAGInfo.h"
|
|
#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
|
|
#include "llvm/CodeGen/TargetSubtargetInfo.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
#define GET_SUBTARGETINFO_HEADER
|
|
#include "BPFGenSubtargetInfo.inc"
|
|
|
|
namespace llvm {
|
|
class StringRef;
|
|
|
|
class BPFSubtarget : public BPFGenSubtargetInfo {
|
|
virtual void anchor();
|
|
BPFInstrInfo InstrInfo;
|
|
BPFFrameLowering FrameLowering;
|
|
BPFTargetLowering TLInfo;
|
|
BPFSelectionDAGInfo TSInfo;
|
|
|
|
private:
|
|
void initializeEnvironment();
|
|
void initSubtargetFeatures(StringRef CPU, StringRef FS);
|
|
bool probeJmpExt();
|
|
|
|
protected:
|
|
// unused
|
|
bool isDummyMode;
|
|
|
|
// whether the cpu supports jmp ext
|
|
bool HasJmpExt;
|
|
|
|
// whether the cpu supports jmp32 ext.
|
|
// NOTE: jmp32 is not enabled when alu32 enabled.
|
|
bool HasJmp32;
|
|
|
|
// whether the cpu supports alu32 instructions.
|
|
bool HasAlu32;
|
|
|
|
// whether we should enable MCAsmInfo DwarfUsesRelocationsAcrossSections
|
|
bool UseDwarfRIS;
|
|
|
|
public:
|
|
// This constructor initializes the data members to match that
|
|
// of the specified triple.
|
|
BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
|
|
const TargetMachine &TM);
|
|
|
|
BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
|
|
|
|
// ParseSubtargetFeatures - Parses features string setting specified
|
|
// subtarget options. Definition of function is auto generated by tblgen.
|
|
void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
|
|
bool getHasJmpExt() const { return HasJmpExt; }
|
|
bool getHasJmp32() const { return HasJmp32; }
|
|
bool getHasAlu32() const { return HasAlu32; }
|
|
bool getUseDwarfRIS() const { return UseDwarfRIS; }
|
|
|
|
const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
|
|
const BPFFrameLowering *getFrameLowering() const override {
|
|
return &FrameLowering;
|
|
}
|
|
const BPFTargetLowering *getTargetLowering() const override {
|
|
return &TLInfo;
|
|
}
|
|
const BPFSelectionDAGInfo *getSelectionDAGInfo() const override {
|
|
return &TSInfo;
|
|
}
|
|
const TargetRegisterInfo *getRegisterInfo() const override {
|
|
return &InstrInfo.getRegisterInfo();
|
|
}
|
|
};
|
|
} // End llvm namespace
|
|
|
|
#endif
|