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 "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"
26 struct XCoreFTAOElim : public MachineFunctionPass {
28 XCoreFTAOElim() : MachineFunctionPass(ID) {}
30 bool runOnMachineFunction(MachineFunction &Fn) override;
32 const char *getPassName() const override {
33 return "XCore FRAME_TO_ARGS_OFFSET Elimination";
36 char XCoreFTAOElim::ID = 0;
39 /// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the
40 /// Frame to args offset elimination pass
41 FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {
42 return new XCoreFTAOElim();
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;
51 MachineBasicBlock &MBB = *MFI;
52 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();
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();