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" 21 using namespace llvm; 22 23 namespace { 24 struct XCoreFTAOElim : public MachineFunctionPass { 25 static char ID; XCoreFTAOElim__anone2a20ea00111::XCoreFTAOElim26 XCoreFTAOElim() : MachineFunctionPass(ID) {} 27 28 bool runOnMachineFunction(MachineFunction &Fn) override; getRequiredProperties__anone2a20ea00111::XCoreFTAOElim29 MachineFunctionProperties getRequiredProperties() const override { 30 return MachineFunctionProperties().set( 31 MachineFunctionProperties::Property::NoVRegs); 32 } 33 getPassName__anone2a20ea00111::XCoreFTAOElim34 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 createXCoreFrameToArgsOffsetEliminationPass()43FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() { 44 return new XCoreFTAOElim(); 45 } 46 runOnMachineFunction(MachineFunction & MF)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(0).getReg(); 57 MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize); 58 OldInst.eraseFromParent(); 59 } 60 } 61 } 62 return true; 63 } 64