66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
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//===-- XCoreFrameToArgsOffsetElim.cpp ----------------------------*- C++ -*-=//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Replace Pseudo FRAME_TO_ARGS_OFFSET with the appropriate real offset.
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//
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//===----------------------------------------------------------------------===//
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#include "XCore.h"
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#include "XCoreInstrInfo.h"
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#include "XCoreSubtarget.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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namespace {
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struct XCoreFTAOElim : public MachineFunctionPass {
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static char ID;
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XCoreFTAOElim() : MachineFunctionPass(ID) {}
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bool runOnMachineFunction(MachineFunction &Fn) override;
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MachineFunctionProperties getRequiredProperties() const override {
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return MachineFunctionProperties().set(
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MachineFunctionProperties::Property::NoVRegs);
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}
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StringRef getPassName() const override {
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return "XCore FRAME_TO_ARGS_OFFSET Elimination";
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}
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};
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char XCoreFTAOElim::ID = 0;
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}
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/// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the
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/// Frame to args offset elimination pass
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FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {
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return new XCoreFTAOElim();
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}
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bool XCoreFTAOElim::runOnMachineFunction(MachineFunction &MF) {
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const XCoreInstrInfo &TII =
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*static_cast<const XCoreInstrInfo *>(MF.getSubtarget().getInstrInfo());
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unsigned StackSize = MF.getFrameInfo().getStackSize();
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for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E;
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++MFI) {
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MachineBasicBlock &MBB = *MFI;
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for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();
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MBBI != EE; ++MBBI) {
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if (MBBI->getOpcode() == XCore::FRAME_TO_ARGS_OFFSET) {
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MachineInstr &OldInst = *MBBI;
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Register Reg = OldInst.getOperand(0).getReg();
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MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize);
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OldInst.eraseFromParent();
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}
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}
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}
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return true;
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}
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