61 lines · cpp
1//===-- XCoreFrameToArgsOffsetElim.cpp ----------------------------*- C++ -*-=//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// Replace Pseudo FRAME_TO_ARGS_OFFSET with the appropriate real offset.10//11//===----------------------------------------------------------------------===//12 13#include "XCore.h"14#include "XCoreInstrInfo.h"15#include "XCoreSubtarget.h"16#include "llvm/CodeGen/MachineFrameInfo.h"17#include "llvm/CodeGen/MachineFunctionPass.h"18#include "llvm/Target/TargetMachine.h"19using namespace llvm;20 21namespace {22 struct XCoreFTAOElim : public MachineFunctionPass {23 static char ID;24 XCoreFTAOElim() : MachineFunctionPass(ID) {}25 26 bool runOnMachineFunction(MachineFunction &Fn) override;27 MachineFunctionProperties getRequiredProperties() const override {28 return MachineFunctionProperties().setNoVRegs();29 }30 31 StringRef getPassName() const override {32 return "XCore FRAME_TO_ARGS_OFFSET Elimination";33 }34 };35 char XCoreFTAOElim::ID = 0;36}37 38/// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the39/// Frame to args offset elimination pass40FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {41 return new XCoreFTAOElim();42}43 44bool XCoreFTAOElim::runOnMachineFunction(MachineFunction &MF) {45 const XCoreInstrInfo &TII =46 *static_cast<const XCoreInstrInfo *>(MF.getSubtarget().getInstrInfo());47 unsigned StackSize = MF.getFrameInfo().getStackSize();48 for (MachineBasicBlock &MBB : MF) {49 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();50 MBBI != EE; ++MBBI) {51 if (MBBI->getOpcode() == XCore::FRAME_TO_ARGS_OFFSET) {52 MachineInstr &OldInst = *MBBI;53 Register Reg = OldInst.getOperand(0).getReg();54 MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize);55 OldInst.eraseFromParent();56 }57 }58 }59 return true;60}61