LLVM API Documentation

IA64InstrInfo.cpp

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00001 //===- IA64InstrInfo.cpp - IA64 Instruction Information -----------*- C++ -*-===//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // This file contains the IA64 implementation of the TargetInstrInfo class.
00011 //
00012 //===----------------------------------------------------------------------===//
00013 
00014 #include "IA64InstrInfo.h"
00015 #include "IA64.h"
00016 #include "IA64InstrBuilder.h"
00017 #include "llvm/CodeGen/MachineInstrBuilder.h"
00018 #include "IA64GenInstrInfo.inc"
00019 using namespace llvm;
00020 
00021 IA64InstrInfo::IA64InstrInfo()
00022   : TargetInstrInfo(IA64Insts, sizeof(IA64Insts)/sizeof(IA64Insts[0])) {
00023 }
00024 
00025 
00026 bool IA64InstrInfo::isMoveInstr(const MachineInstr& MI,
00027                                unsigned& sourceReg,
00028                                unsigned& destReg) const {
00029   MachineOpCode oc = MI.getOpcode();
00030   if (oc == IA64::MOV || oc == IA64::FMOV) {
00031   // TODO: this doesn't detect predicate moves
00032      assert(MI.getNumOperands() == 2 &&
00033              /* MI.getOperand(0).isRegister() &&
00034              MI.getOperand(1).isRegister() && */
00035              "invalid register-register move instruction");
00036      if( MI.getOperand(0).isRegister() &&
00037          MI.getOperand(1).isRegister() ) {
00038        // if both operands of the MOV/FMOV are registers, then
00039        // yes, this is a move instruction
00040        sourceReg = MI.getOperand(1).getReg();
00041        destReg = MI.getOperand(0).getReg();
00042        return true;
00043      }
00044   }
00045   return false; // we don't consider e.g. %regN = MOV <FrameIndex #x> a
00046                 // move instruction
00047 }
00048