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 "XCoreSubtarget.h" 17 #include "llvm/CodeGen/MachineFrameInfo.h" 18 #include "llvm/CodeGen/MachineFunctionPass.h" 19 #include "llvm/CodeGen/MachineInstrBuilder.h" 20 #include "llvm/Support/Compiler.h" 21 #include "llvm/Support/raw_ostream.h" 22 #include "llvm/Target/TargetMachine.h" 23 using namespace llvm; 24 25 namespace { 26 struct XCoreFTAOElim : public MachineFunctionPass { 27 static char ID; 28 XCoreFTAOElim() : MachineFunctionPass(ID) {} 29 30 bool runOnMachineFunction(MachineFunction &Fn) override; 31 32 const char *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 (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E; 50 ++MFI) { 51 MachineBasicBlock &MBB = *MFI; 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 unsigned Reg = OldInst->getOperand(0).getReg(); 57 MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize); 58 OldInst->eraseFromParent(); 59 } 60 } 61 } 62 return true; 63 } 64
