lib/Target/MSP430/MSP430InstrInfo.cpp

   1 //===- MSP430InstrInfo.cpp - MSP430 Instruction Information ---------------===//
   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 // This file contains the MSP430 implementation of the TargetInstrInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "MSP430.h"
  15 #include "MSP430InstrInfo.h"
  16 #include "MSP430TargetMachine.h"
  17 #include "MSP430GenInstrInfo.inc"
  18 #include "llvm/Function.h"
  19 #include "llvm/CodeGen/MachineFunction.h"
  20 #include "llvm/CodeGen/MachineInstrBuilder.h"
  21 #include "llvm/CodeGen/MachineRegisterInfo.h"
  22
  23
  24 using namespace llvm;
  25
  26 MSP430InstrInfo::MSP430InstrInfo(MSP430TargetMachine &tm)
  27   : TargetInstrInfoImpl(MSP430Insts, array_lengthof(MSP430Insts)),
  28     RI(tm, *this), TM(tm) {}
  29
  30 bool MSP430InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
  31                                    MachineBasicBlock::iterator I,
  32                                    unsigned DestReg, unsigned SrcReg,
  33                                    const TargetRegisterClass *DestRC,
  34                                    const TargetRegisterClass *SrcRC) const {
  35   DebugLoc DL = DebugLoc::getUnknownLoc();
  36   if (I != MBB.end()) DL = I->getDebugLoc();
  37
  38   if (DestRC == SrcRC) {
  39     unsigned Opc;
  40     if (DestRC == &MSP430::GR16RegClass) {
  41       Opc = MSP430::MOV16rr;
  42     } else if (DestRC == &MSP430::GR8RegClass) {
  43       Opc = MSP430::MOV8rr;
  44     } else {
  45       return false;
  46     }
  47
  48     BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg);
  49     return true;
  50   }
  51
  52   return false;
  53 }
  54
  55 bool
  56 MSP430InstrInfo::isMoveInstr(const MachineInstr& MI,
  57                              unsigned &SrcReg, unsigned &DstReg,
  58                              unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
  59   SrcSubIdx = DstSubIdx = 0; // No sub-registers yet.
  60
  61   switch (MI.getOpcode()) {
  62   default:
  63     return false;
  64   case MSP430::MOV8rr:
  65   case MSP430::MOV16rr:
  66    assert(MI.getNumOperands() >= 2 &&
  67            MI.getOperand(0).isReg() &&
  68            MI.getOperand(1).isReg() &&
  69            "invalid register-register move instruction");
  70     SrcReg = MI.getOperand(1).getReg();
  71     DstReg = MI.getOperand(0).getReg();
  72     return true;
  73   }
  74 }