llvm-6502/lib/Target/PowerPC/PPCInstrInfo.cpp

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//===- PPC32InstrInfo.cpp - PowerPC32 Instruction Information ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the PowerPC implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "PPC32InstrInfo.h"
#include "PPC32GenInstrInfo.inc"
#include "PowerPC.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include <iostream>
using namespace llvm;
PPC32InstrInfo::PPC32InstrInfo()
: TargetInstrInfo(PPC32Insts, sizeof(PPC32Insts)/sizeof(PPC32Insts[0])) {}
bool PPC32InstrInfo::isMoveInstr(const MachineInstr& MI,
unsigned& sourceReg,
unsigned& destReg) const {
MachineOpCode oc = MI.getOpcode();
if (oc == PPC::OR) { // or r1, r2, r2
assert(MI.getNumOperands() == 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
MI.getOperand(2).isRegister() &&
"invalid PPC OR instruction!");
if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::ADDI) { // addi r1, r2, 0
assert(MI.getNumOperands() == 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(2).isImmediate() &&
"invalid PPC ADDI instruction!");
if (MI.getOperand(1).isRegister() && MI.getOperand(2).getImmedValue()==0) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::ORI) { // ori r1, r2, 0
assert(MI.getNumOperands() == 3 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
MI.getOperand(2).isImmediate() &&
"invalid PPC ORI instruction!");
if (MI.getOperand(2).getImmedValue()==0) {
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
} else if (oc == PPC::FMR) { // fmr r1, r2
assert(MI.getNumOperands() == 2 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
"invalid PPC FMR instruction");
sourceReg = MI.getOperand(1).getReg();
destReg = MI.getOperand(0).getReg();
return true;
}
return false;
}