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/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 the
39/// Frame to args offset elimination pass
40FunctionPass *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(i: 0).getReg();
54 MBBI = TII.loadImmediate(MBB, MI: MBBI, Reg, Value: StackSize);
55 OldInst.eraseFromParent();
56 }
57 }
58 }
59 return true;
60}
61