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-exception
6//
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/CodeGen/MachineInstrBuilder.h"
19#include "llvm/Support/raw_ostream.h"
20#include "llvm/Target/TargetMachine.h"
21using namespace llvm;
22
23namespace {
24 struct XCoreFTAOElim : public MachineFunctionPass {
25 static char ID;
26 XCoreFTAOElim() : MachineFunctionPass(ID) {}
27
28 bool runOnMachineFunction(MachineFunction &Fn) override;
29 MachineFunctionProperties getRequiredProperties() const override {
30 return MachineFunctionProperties().set(
31 MachineFunctionProperties::Property::NoVRegs);
32 }
33
34 StringRef getPassName() const override {
35 return "XCore FRAME_TO_ARGS_OFFSET Elimination";
36 }
37 };
38 char XCoreFTAOElim::ID = 0;
39}
40
41/// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the
42/// Frame to args offset elimination pass
43FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {
44 return new XCoreFTAOElim();
45}
46
47bool XCoreFTAOElim::runOnMachineFunction(MachineFunction &MF) {
48 const XCoreInstrInfo &TII =
49 *static_cast<const XCoreInstrInfo *>(MF.getSubtarget().getInstrInfo());
50 unsigned StackSize = MF.getFrameInfo().getStackSize();
51 for (MachineBasicBlock &MBB : MF) {
52 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();
53 MBBI != EE; ++MBBI) {
54 if (MBBI->getOpcode() == XCore::FRAME_TO_ARGS_OFFSET) {
55 MachineInstr &OldInst = *MBBI;
56 Register Reg = OldInst.getOperand(i: 0).getReg();
57 MBBI = TII.loadImmediate(MBB, MI: MBBI, Reg, Value: StackSize);
58 OldInst.eraseFromParent();
59 }
60 }
61 }
62 return true;
63}
64