1 //===-- XCoreFrameToArgsOffsetElim.cpp ----------------------------*- C++ -*-=// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Replace Pseudo FRAME_TO_ARGS_OFFSET with the appropriate real offset. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "XCore.h" 15 #include "XCoreInstrInfo.h" 16 #include "llvm/CodeGen/MachineFrameInfo.h" 17 #include "llvm/CodeGen/MachineFunctionPass.h" 18 #include "llvm/CodeGen/MachineInstrBuilder.h" 19 #include "llvm/Support/Compiler.h" 20 #include "llvm/Support/raw_ostream.h" 21 #include "llvm/Target/TargetMachine.h" 22 using namespace llvm; 23 24 namespace { 25 struct XCoreFTAOElim : public MachineFunctionPass { 26 static char ID; 27 XCoreFTAOElim() : MachineFunctionPass(ID) {} 28 29 bool runOnMachineFunction(MachineFunction &Fn) override; 30 31 const char *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 40 FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() { 41 return new XCoreFTAOElim(); 42 } 43 44 bool XCoreFTAOElim::runOnMachineFunction(MachineFunction &MF) { 45 const XCoreInstrInfo &TII = 46 *static_cast<const XCoreInstrInfo*>(MF.getTarget().getInstrInfo()); 47 unsigned StackSize = MF.getFrameInfo()->getStackSize(); 48 for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E; 49 ++MFI) { 50 MachineBasicBlock &MBB = *MFI; 51 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end(); 52 MBBI != EE; ++MBBI) { 53 if (MBBI->getOpcode() == XCore::FRAME_TO_ARGS_OFFSET) { 54 MachineInstr *OldInst = MBBI; 55 unsigned Reg = OldInst->getOperand(0).getReg(); 56 MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize); 57 OldInst->eraseFromParent(); 58 } 59 } 60 } 61 return true; 62 } 63
