[llvm-branch-commits] [llvm] [BPF][GlobalISel] add initial gisel support for BPF (PR #74999)
Yingchi Long via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Sun Dec 10 07:06:38 PST 2023
https://github.com/inclyc created https://github.com/llvm/llvm-project/pull/74999
This adds initial codegen support for BPF backend.
Only implemented ir-translator for "RET" (but not support isel).
Depends on: #74998
>From 5549edd4862b6242c41df44a40a23adfa245ddb1 Mon Sep 17 00:00:00 2001
From: Yingchi Long <i at lyc.dev>
Date: Sun, 10 Dec 2023 22:57:39 +0800
Subject: [PATCH] [BPF][GlobalISel] add initial gisel support for BPF
This adds initial codegen support for BPF backend.
Only implemented ir-translator for "RET" (but not support isel).
Depends on: #74998
---
llvm/lib/Target/BPF/BPF.h | 7 ++
llvm/lib/Target/BPF/BPF.td | 1 +
llvm/lib/Target/BPF/BPFSubtarget.cpp | 28 ++++++
llvm/lib/Target/BPF/BPFSubtarget.h | 17 +++-
llvm/lib/Target/BPF/BPFTargetMachine.cpp | 31 +++++++
llvm/lib/Target/BPF/CMakeLists.txt | 7 ++
llvm/lib/Target/BPF/GISel/BPFCallLowering.cpp | 46 ++++++++++
llvm/lib/Target/BPF/GISel/BPFCallLowering.h | 39 ++++++++
.../BPF/GISel/BPFInstructionSelector.cpp | 91 +++++++++++++++++++
.../lib/Target/BPF/GISel/BPFLegalizerInfo.cpp | 22 +++++
llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.h | 28 ++++++
.../Target/BPF/GISel/BPFRegisterBankInfo.cpp | 25 +++++
.../Target/BPF/GISel/BPFRegisterBankInfo.h | 39 ++++++++
llvm/lib/Target/BPF/GISel/BPFRegisterBanks.td | 15 +++
.../Target/BPF/MCTargetDesc/BPFMCTargetDesc.h | 5 +-
.../BPF/GlobalISel/ir-translator-ret.ll | 7 ++
16 files changed, 404 insertions(+), 4 deletions(-)
create mode 100644 llvm/lib/Target/BPF/GISel/BPFCallLowering.cpp
create mode 100644 llvm/lib/Target/BPF/GISel/BPFCallLowering.h
create mode 100644 llvm/lib/Target/BPF/GISel/BPFInstructionSelector.cpp
create mode 100644 llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.cpp
create mode 100644 llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.h
create mode 100644 llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.cpp
create mode 100644 llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.h
create mode 100644 llvm/lib/Target/BPF/GISel/BPFRegisterBanks.td
create mode 100644 llvm/test/CodeGen/BPF/GlobalISel/ir-translator-ret.ll
diff --git a/llvm/lib/Target/BPF/BPF.h b/llvm/lib/Target/BPF/BPF.h
index 436cd62c258138..5c77d183e1ef3d 100644
--- a/llvm/lib/Target/BPF/BPF.h
+++ b/llvm/lib/Target/BPF/BPF.h
@@ -16,7 +16,10 @@
#include "llvm/Target/TargetMachine.h"
namespace llvm {
+class BPFRegisterBankInfo;
+class BPFSubtarget;
class BPFTargetMachine;
+class InstructionSelector;
class PassRegistry;
ModulePass *createBPFCheckAndAdjustIR();
@@ -27,6 +30,10 @@ FunctionPass *createBPFMIPeepholePass();
FunctionPass *createBPFMIPreEmitPeepholePass();
FunctionPass *createBPFMIPreEmitCheckingPass();
+InstructionSelector *createBPFInstructionSelector(const BPFTargetMachine &,
+ const BPFSubtarget &,
+ const BPFRegisterBankInfo &);
+
void initializeBPFCheckAndAdjustIRPass(PassRegistry&);
void initializeBPFDAGToDAGISelPass(PassRegistry &);
void initializeBPFMIPeepholePass(PassRegistry &);
diff --git a/llvm/lib/Target/BPF/BPF.td b/llvm/lib/Target/BPF/BPF.td
index 7f38fbdd8c5c10..dff76ca07af511 100644
--- a/llvm/lib/Target/BPF/BPF.td
+++ b/llvm/lib/Target/BPF/BPF.td
@@ -11,6 +11,7 @@ include "llvm/Target/Target.td"
include "BPFRegisterInfo.td"
include "BPFCallingConv.td"
include "BPFInstrInfo.td"
+include "GISel/BPFRegisterBanks.td"
def BPFInstrInfo : InstrInfo;
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.cpp b/llvm/lib/Target/BPF/BPFSubtarget.cpp
index 5e79142ea9e1c8..9a8e42f3237114 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.cpp
+++ b/llvm/lib/Target/BPF/BPFSubtarget.cpp
@@ -12,6 +12,10 @@
#include "BPFSubtarget.h"
#include "BPF.h"
+#include "BPFTargetMachine.h"
+#include "GISel/BPFCallLowering.h"
+#include "GISel/BPFLegalizerInfo.h"
+#include "GISel/BPFRegisterBankInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/TargetParser/Host.h"
@@ -95,4 +99,28 @@ BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
FrameLowering(initializeSubtargetDependencies(CPU, FS)),
TLInfo(TM, *this) {
IsLittleEndian = TT.isLittleEndian();
+
+ CallLoweringInfo.reset(new BPFCallLowering(*getTargetLowering()));
+ Legalizer.reset(new BPFLegalizerInfo(*this));
+ auto *RBI = new BPFRegisterBankInfo(*getRegisterInfo());
+ RegBankInfo.reset(RBI);
+
+ InstSelector.reset(createBPFInstructionSelector(
+ *static_cast<const BPFTargetMachine *>(&TM), *this, *RBI));
+}
+
+const CallLowering *BPFSubtarget::getCallLowering() const {
+ return CallLoweringInfo.get();
+}
+
+InstructionSelector *BPFSubtarget::getInstructionSelector() const {
+ return InstSelector.get();
+}
+
+const LegalizerInfo *BPFSubtarget::getLegalizerInfo() const {
+ return Legalizer.get();
+}
+
+const RegisterBankInfo *BPFSubtarget::getRegBankInfo() const {
+ return RegBankInfo.get();
}
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.h b/llvm/lib/Target/BPF/BPFSubtarget.h
index a55ae618f4d1d3..33747546eadc3b 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.h
+++ b/llvm/lib/Target/BPF/BPFSubtarget.h
@@ -16,7 +16,12 @@
#include "BPFFrameLowering.h"
#include "BPFISelLowering.h"
#include "BPFInstrInfo.h"
+#include "BPFRegisterInfo.h"
#include "BPFSelectionDAGInfo.h"
+#include "llvm/CodeGen/GlobalISel/CallLowering.h"
+#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
+#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
+#include "llvm/CodeGen/RegisterBankInfo.h"
#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DataLayout.h"
@@ -61,6 +66,11 @@ class BPFSubtarget : public BPFGenSubtargetInfo {
// whether cpu v4 insns are enabled.
bool HasLdsx, HasMovsx, HasBswap, HasSdivSmod, HasGotol, HasStoreImm;
+ std::unique_ptr<CallLowering> CallLoweringInfo;
+ std::unique_ptr<InstructionSelector> InstSelector;
+ std::unique_ptr<LegalizerInfo> Legalizer;
+ std::unique_ptr<RegisterBankInfo> RegBankInfo;
+
public:
// This constructor initializes the data members to match that
// of the specified triple.
@@ -95,9 +105,14 @@ class BPFSubtarget : public BPFGenSubtargetInfo {
const BPFSelectionDAGInfo *getSelectionDAGInfo() const override {
return &TSInfo;
}
- const TargetRegisterInfo *getRegisterInfo() const override {
+ const BPFRegisterInfo *getRegisterInfo() const override {
return &InstrInfo.getRegisterInfo();
}
+
+ const CallLowering *getCallLowering() const override;
+ InstructionSelector *getInstructionSelector() const override;
+ const LegalizerInfo *getLegalizerInfo() const override;
+ const RegisterBankInfo *getRegBankInfo() const override;
};
} // End llvm namespace
diff --git a/llvm/lib/Target/BPF/BPFTargetMachine.cpp b/llvm/lib/Target/BPF/BPFTargetMachine.cpp
index 65286c822c4b58..ab0db576f7f72d 100644
--- a/llvm/lib/Target/BPF/BPFTargetMachine.cpp
+++ b/llvm/lib/Target/BPF/BPFTargetMachine.cpp
@@ -15,10 +15,15 @@
#include "BPFTargetTransformInfo.h"
#include "MCTargetDesc/BPFMCAsmInfo.h"
#include "TargetInfo/BPFTargetInfo.h"
+#include "llvm/CodeGen/GlobalISel/IRTranslator.h"
+#include "llvm/CodeGen/GlobalISel/InstructionSelect.h"
+#include "llvm/CodeGen/GlobalISel/Legalizer.h"
+#include "llvm/CodeGen/GlobalISel/RegBankSelect.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/PassManager.h"
+#include "llvm/InitializePasses.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Support/FormattedStream.h"
@@ -40,6 +45,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTarget() {
RegisterTargetMachine<BPFTargetMachine> Z(getTheBPFTarget());
PassRegistry &PR = *PassRegistry::getPassRegistry();
+ initializeGlobalISel(PR);
initializeBPFCheckAndAdjustIRPass(PR);
initializeBPFMIPeepholePass(PR);
initializeBPFDAGToDAGISelPass(PR);
@@ -90,6 +96,11 @@ class BPFPassConfig : public TargetPassConfig {
bool addInstSelector() override;
void addMachineSSAOptimization() override;
void addPreEmitPass() override;
+
+ bool addIRTranslator() override;
+ bool addLegalizeMachineIR() override;
+ bool addRegBankSelect() override;
+ bool addGlobalInstructionSelect() override;
};
}
@@ -174,3 +185,23 @@ void BPFPassConfig::addPreEmitPass() {
if (!DisableMIPeephole)
addPass(createBPFMIPreEmitPeepholePass());
}
+
+bool BPFPassConfig::addIRTranslator() {
+ addPass(new IRTranslator());
+ return false;
+}
+
+bool BPFPassConfig::addLegalizeMachineIR() {
+ addPass(new Legalizer());
+ return false;
+}
+
+bool BPFPassConfig::addRegBankSelect() {
+ addPass(new RegBankSelect());
+ return false;
+}
+
+bool BPFPassConfig::addGlobalInstructionSelect() {
+ addPass(new InstructionSelect(getOptLevel()));
+ return false;
+}
diff --git a/llvm/lib/Target/BPF/CMakeLists.txt b/llvm/lib/Target/BPF/CMakeLists.txt
index 6a96394a6aee3e..d88e7ade40b9a0 100644
--- a/llvm/lib/Target/BPF/CMakeLists.txt
+++ b/llvm/lib/Target/BPF/CMakeLists.txt
@@ -11,10 +11,16 @@ tablegen(LLVM BPFGenInstrInfo.inc -gen-instr-info)
tablegen(LLVM BPFGenMCCodeEmitter.inc -gen-emitter)
tablegen(LLVM BPFGenRegisterInfo.inc -gen-register-info)
tablegen(LLVM BPFGenSubtargetInfo.inc -gen-subtarget)
+tablegen(LLVM BPFGenGlobalISel.inc -gen-global-isel)
+tablegen(LLVM BPFGenRegisterBank.inc -gen-register-bank)
add_public_tablegen_target(BPFCommonTableGen)
add_llvm_target(BPFCodeGen
+ GISel/BPFCallLowering.cpp
+ GISel/BPFInstructionSelector.cpp
+ GISel/BPFRegisterBankInfo.cpp
+ GISel/BPFLegalizerInfo.cpp
BPFAbstractMemberAccess.cpp
BPFAdjustOpt.cpp
BPFAsmPrinter.cpp
@@ -44,6 +50,7 @@ add_llvm_target(BPFCodeGen
CodeGen
CodeGenTypes
Core
+ GlobalISel
IPO
MC
Scalar
diff --git a/llvm/lib/Target/BPF/GISel/BPFCallLowering.cpp b/llvm/lib/Target/BPF/GISel/BPFCallLowering.cpp
new file mode 100644
index 00000000000000..3829a1a3151f31
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFCallLowering.cpp
@@ -0,0 +1,46 @@
+//===-- BPFCallLowering.cpp - Call lowering for GlobalISel ------*- 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements the lowering of LLVM calls to machine code calls for
+/// GlobalISel.
+///
+//===----------------------------------------------------------------------===//
+
+#include "BPFCallLowering.h"
+#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "bpf-call-lowering"
+
+using namespace llvm;
+
+BPFCallLowering::BPFCallLowering(const BPFTargetLowering &TLI)
+ : CallLowering(&TLI) {}
+
+bool BPFCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
+ const Value *Val, ArrayRef<Register> VRegs,
+ FunctionLoweringInfo &FLI,
+ Register SwiftErrorVReg) const {
+ if (!VRegs.empty())
+ return false;
+ MIRBuilder.buildInstr(BPF::RET);
+ return true;
+}
+
+bool BPFCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
+ const Function &F,
+ ArrayRef<ArrayRef<Register>> VRegs,
+ FunctionLoweringInfo &FLI) const {
+ return VRegs.empty();
+}
+
+bool BPFCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
+ CallLoweringInfo &Info) const {
+ return false;
+}
diff --git a/llvm/lib/Target/BPF/GISel/BPFCallLowering.h b/llvm/lib/Target/BPF/GISel/BPFCallLowering.h
new file mode 100644
index 00000000000000..0099d2048fe521
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFCallLowering.h
@@ -0,0 +1,39 @@
+//===-- BPFCallLowering.h - Call lowering for GlobalISel --------*- 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file describes how to lower LLVM calls to machine code calls.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_GISEL_BPFCALLLOWERING_H
+#define LLVM_LIB_TARGET_BPF_GISEL_BPFCALLLOWERING_H
+
+#include "BPFISelLowering.h"
+#include "llvm/CodeGen/GlobalISel/CallLowering.h"
+#include "llvm/IR/CallingConv.h"
+
+namespace llvm {
+
+class BPFTargetLowering;
+
+class BPFCallLowering : public CallLowering {
+public:
+ BPFCallLowering(const BPFTargetLowering &TLI);
+ bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
+ ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
+ Register SwiftErrorVReg) const override;
+ bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
+ ArrayRef<ArrayRef<Register>> VRegs,
+ FunctionLoweringInfo &FLI) const override;
+ bool lowerCall(MachineIRBuilder &MIRBuilder,
+ CallLoweringInfo &Info) const override;
+};
+} // namespace llvm
+
+#endif
diff --git a/llvm/lib/Target/BPF/GISel/BPFInstructionSelector.cpp b/llvm/lib/Target/BPF/GISel/BPFInstructionSelector.cpp
new file mode 100644
index 00000000000000..1effeb7a57b13b
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFInstructionSelector.cpp
@@ -0,0 +1,91 @@
+//===- BPFInstructionSelector.cpp --------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements the targeting of the InstructionSelector class for BPF.
+//===----------------------------------------------------------------------===//
+
+#include "BPFInstrInfo.h"
+#include "BPFRegisterBankInfo.h"
+#include "BPFSubtarget.h"
+#include "BPFTargetMachine.h"
+#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
+#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
+#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/IR/IntrinsicsBPF.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "bpf-gisel"
+
+using namespace llvm;
+
+namespace {
+
+#define GET_GLOBALISEL_PREDICATE_BITSET
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_PREDICATE_BITSET
+
+class BPFInstructionSelector : public InstructionSelector {
+public:
+ BPFInstructionSelector(const BPFTargetMachine &TM, const BPFSubtarget &STI,
+ const BPFRegisterBankInfo &RBI);
+
+ bool select(MachineInstr &I) override;
+ static const char *getName() { return DEBUG_TYPE; }
+
+private:
+ /// tblgen generated 'select' implementation that is used as the initial
+ /// selector for the patterns that do not require complex C++.
+ bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;
+
+ const BPFInstrInfo &TII;
+ const BPFRegisterInfo &TRI;
+ const BPFRegisterBankInfo &RBI;
+
+#define GET_GLOBALISEL_PREDICATES_DECL
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_PREDICATES_DECL
+
+#define GET_GLOBALISEL_TEMPORARIES_DECL
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_TEMPORARIES_DECL
+};
+
+} // namespace
+
+#define GET_GLOBALISEL_IMPL
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_IMPL
+
+BPFInstructionSelector::BPFInstructionSelector(const BPFTargetMachine &TM,
+ const BPFSubtarget &STI,
+ const BPFRegisterBankInfo &RBI)
+ : TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI),
+#define GET_GLOBALISEL_PREDICATES_INIT
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_PREDICATES_INIT
+#define GET_GLOBALISEL_TEMPORARIES_INIT
+#include "BPFGenGlobalISel.inc"
+#undef GET_GLOBALISEL_TEMPORARIES_INIT
+{
+}
+
+bool BPFInstructionSelector::select(MachineInstr &I) {
+ if (selectImpl(I, *CoverageInfo))
+ return true;
+ return false;
+}
+
+namespace llvm {
+InstructionSelector *
+createBPFInstructionSelector(const BPFTargetMachine &TM,
+ const BPFSubtarget &Subtarget,
+ const BPFRegisterBankInfo &RBI) {
+ return new BPFInstructionSelector(TM, Subtarget, RBI);
+}
+} // namespace llvm
diff --git a/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.cpp b/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.cpp
new file mode 100644
index 00000000000000..04220c176376d1
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.cpp
@@ -0,0 +1,22 @@
+//===- BPFLegalizerInfo.h ----------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements the targeting of the Machinelegalizer class for BPF
+//===----------------------------------------------------------------------===//
+
+#include "BPFLegalizerInfo.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "bpf-legalinfo"
+
+using namespace llvm;
+using namespace LegalizeActions;
+
+BPFLegalizerInfo::BPFLegalizerInfo(const BPFSubtarget &ST) {
+ getLegacyLegalizerInfo().computeTables();
+}
diff --git a/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.h b/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.h
new file mode 100644
index 00000000000000..1704bc03144c6e
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFLegalizerInfo.h
@@ -0,0 +1,28 @@
+//===- BPFLegalizerInfo.h ----------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file declares the targeting of the Machinelegalizer class for BPF
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_GISEL_BPFMACHINELEGALIZER_H
+#define LLVM_LIB_TARGET_BPF_GISEL_BPFMACHINELEGALIZER_H
+
+#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
+
+namespace llvm {
+
+class BPFSubtarget;
+
+/// This class provides the information for the BPF target legalizer for
+/// GlobalISel.
+class BPFLegalizerInfo : public LegalizerInfo {
+public:
+ BPFLegalizerInfo(const BPFSubtarget &ST);
+};
+} // namespace llvm
+#endif
diff --git a/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.cpp b/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.cpp
new file mode 100644
index 00000000000000..f50e8f524a872b
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.cpp
@@ -0,0 +1,25 @@
+//===- BPFRegisterBankInfo.cpp --------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements the targeting of the RegisterBankInfo class for BPF
+//===----------------------------------------------------------------------===//
+
+#include "BPFRegisterBankInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "bpf-reg-bank-info"
+
+#define GET_TARGET_REGBANK_IMPL
+#include "BPFGenRegisterBank.inc"
+
+using namespace llvm;
+
+BPFRegisterBankInfo::BPFRegisterBankInfo(const TargetRegisterInfo &TRI)
+ : BPFGenRegisterBankInfo() {}
diff --git a/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.h b/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.h
new file mode 100644
index 00000000000000..82421916ca5ed4
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFRegisterBankInfo.h
@@ -0,0 +1,39 @@
+//===-- BPFRegisterBankInfo.h -----------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file declares the targeting of the RegisterBankInfo class for BPF.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_GISEL_BPFREGISTERBANKINFO_H
+#define LLVM_LIB_TARGET_BPF_GISEL_BPFREGISTERBANKINFO_H
+
+#include "MCTargetDesc/BPFMCTargetDesc.h"
+#include "llvm/CodeGen/RegisterBankInfo.h"
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+
+#define GET_REGBANK_DECLARATIONS
+#include "BPFGenRegisterBank.inc"
+
+namespace llvm {
+class TargetRegisterInfo;
+
+class BPFGenRegisterBankInfo : public RegisterBankInfo {
+protected:
+#define GET_TARGET_REGBANK_CLASS
+#include "BPFGenRegisterBank.inc"
+};
+
+class BPFRegisterBankInfo final : public BPFGenRegisterBankInfo {
+public:
+ BPFRegisterBankInfo(const TargetRegisterInfo &TRI);
+};
+} // namespace llvm
+
+#endif
diff --git a/llvm/lib/Target/BPF/GISel/BPFRegisterBanks.td b/llvm/lib/Target/BPF/GISel/BPFRegisterBanks.td
new file mode 100644
index 00000000000000..af4af40a253766
--- /dev/null
+++ b/llvm/lib/Target/BPF/GISel/BPFRegisterBanks.td
@@ -0,0 +1,15 @@
+//===-- BPFRegisterBanks.td - Describe the BPF Banks -------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Define the BPF register banks used for GlobalISel.
+///
+//===----------------------------------------------------------------------===//
+
+/// General Purpose Registers
+def GPRRegBank : RegisterBank<"GPRB", [GPR]>;
diff --git a/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h b/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
index ea30e714a5b756..f12b79586bafe3 100644
--- a/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
+++ b/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
@@ -30,8 +30,7 @@ class MCSubtargetInfo;
class MCTargetOptions;
class Target;
-MCCodeEmitter *createBPFMCCodeEmitter(const MCInstrInfo &MCII,
- MCContext &Ctx);
+MCCodeEmitter *createBPFMCCodeEmitter(const MCInstrInfo &MCII, MCContext &Ctx);
MCCodeEmitter *createBPFbeMCCodeEmitter(const MCInstrInfo &MCII,
MCContext &Ctx);
@@ -43,7 +42,7 @@ MCAsmBackend *createBPFbeAsmBackend(const Target &T, const MCSubtargetInfo &STI,
const MCTargetOptions &Options);
std::unique_ptr<MCObjectTargetWriter> createBPFELFObjectWriter(uint8_t OSABI);
-}
+} // namespace llvm
// Defines symbolic names for BPF registers. This defines a mapping from
// register name to register number.
diff --git a/llvm/test/CodeGen/BPF/GlobalISel/ir-translator-ret.ll b/llvm/test/CodeGen/BPF/GlobalISel/ir-translator-ret.ll
new file mode 100644
index 00000000000000..7a014f7841fc87
--- /dev/null
+++ b/llvm/test/CodeGen/BPF/GlobalISel/ir-translator-ret.ll
@@ -0,0 +1,7 @@
+; RUN: llc -mtriple=bpfel -global-isel -verify-machineinstrs -stop-after=irtranslator < %s | FileCheck %s
+
+; CHECK: name: f
+; CHECK: RET
+define void @f() {
+ ret void
+}
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