lib/Target/SystemZ/SystemZInstrInfo.cpp

   1 //===- SystemZInstrInfo.cpp - SystemZ 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 SystemZ implementation of the TargetInstrInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SystemZ.h"
  15 #include "SystemZInstrInfo.h"
  16 #include "SystemZMachineFunctionInfo.h"
  17 #include "SystemZTargetMachine.h"
  18 #include "SystemZGenInstrInfo.inc"
  19 #include "llvm/Function.h"
  20 #include "llvm/CodeGen/MachineFrameInfo.h"
  21 #include "llvm/CodeGen/MachineInstrBuilder.h"
  22 #include "llvm/CodeGen/MachineRegisterInfo.h"
  23 #include "llvm/CodeGen/PseudoSourceValue.h"
  24
  25 using namespace llvm;
  26
  27 SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
  28   : TargetInstrInfoImpl(SystemZInsts, array_lengthof(SystemZInsts)),
  29     RI(tm, *this), TM(tm) {}
  30
  31 void SystemZInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
  32                                           MachineBasicBlock::iterator MI,
  33                                     unsigned SrcReg, bool isKill, int FrameIdx,
  34                                     const TargetRegisterClass *RC) const {
  35   assert(0 && "Cannot store this register to stack slot!");
  36 }
  37
  38 void SystemZInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
  39                                            MachineBasicBlock::iterator MI,
  40                                            unsigned DestReg, int FrameIdx,
  41                                            const TargetRegisterClass *RC) const{
  42   assert(0 && "Cannot store this register to stack slot!");
  43 }
  44
  45 bool SystemZInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
  46                                     MachineBasicBlock::iterator I,
  47                                     unsigned DestReg, unsigned SrcReg,
  48                                     const TargetRegisterClass *DestRC,
  49                                     const TargetRegisterClass *SrcRC) const {
  50   DebugLoc DL = DebugLoc::getUnknownLoc();
  51   if (I != MBB.end()) DL = I->getDebugLoc();
  52
  53   // Determine if DstRC and SrcRC have a common superclass.
  54   const TargetRegisterClass *CommonRC = DestRC;
  55   if (DestRC == SrcRC)
  56     /* Same regclass for source and dest */;
  57   else if (CommonRC->hasSuperClass(SrcRC))
  58     CommonRC = SrcRC;
  59   else if (!CommonRC->hasSubClass(SrcRC))
  60     CommonRC = 0;
  61
  62   if (CommonRC) {
  63     unsigned Opc;
  64     if (CommonRC == &SystemZ::GR64RegClass) {
  65       Opc = SystemZ::MOV64rr;
  66     } else if (CommonRC == &SystemZ::GR32RegClass) {
  67       Opc = SystemZ::MOV32rr;
  68     } else {
  69       return false;
  70     }
  71
  72     BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg);
  73     return true;
  74   }
  75
  76   return false;
  77 }
  78
  79 bool
  80 SystemZInstrInfo::isMoveInstr(const MachineInstr& MI,
  81                               unsigned &SrcReg, unsigned &DstReg,
  82                               unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
  83   SrcSubIdx = DstSubIdx = 0; // No sub-registers yet.
  84
  85   switch (MI.getOpcode()) {
  86   default:
  87     return false;
  88   case SystemZ::MOV32rr:
  89   case SystemZ::MOV64rr:
  90     assert(MI.getNumOperands() >= 2 &&
  91            MI.getOperand(0).isReg() &&
  92            MI.getOperand(1).isReg() &&
  93            "invalid register-register move instruction");
  94     SrcReg = MI.getOperand(1).getReg();
  95     DstReg = MI.getOperand(0).getReg();
  96     return true;
  97   }
  98 }
  99
 100 bool
 101 SystemZInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
 102                                            MachineBasicBlock::iterator MI,
 103                                 const std::vector<CalleeSavedInfo> &CSI) const {
 104   return false;
 105 }
 106
 107 bool
 108 SystemZInstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
 109                                              MachineBasicBlock::iterator MI,
 110                                 const std::vector<CalleeSavedInfo> &CSI) const {
 111   return false;
 112 }
 113
 114 unsigned
 115 SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
 116                               MachineBasicBlock *FBB,
 117                             const SmallVectorImpl<MachineOperand> &Cond) const {
 118   assert(0 && "Implement branches!");
 119
 120   return 0;
 121 }