1 //===-- XCoreFrameToArgsOffsetElim.cpp ----------------------------*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Replace Pseudo FRAME_TO_ARGS_OFFSET with the appropriate real offset.
12 //===----------------------------------------------------------------------===//
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"
25 struct XCoreFTAOElim : public MachineFunctionPass {
27 XCoreFTAOElim() : MachineFunctionPass(ID) {}
29 virtual bool runOnMachineFunction(MachineFunction &Fn);
31 virtual const char *getPassName() const {
32 return "XCore FRAME_TO_ARGS_OFFSET Elimination";
35 char XCoreFTAOElim::ID = 0;
38 /// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the
39 /// Frame to args offset elimination pass
40 FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {
41 return new XCoreFTAOElim();
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;
50 MachineBasicBlock &MBB = *MFI;
51 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();
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();