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