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      1 //===- Thumb2RegisterInfo.cpp - Thumb-2 Register Information ----*- C++ -*-===//
      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 Thumb-2 implementation of the TargetRegisterInfo
     11 // class.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "ARM.h"
     16 #include "ARMSubtarget.h"
     17 #include "Thumb2InstrInfo.h"
     18 #include "Thumb2RegisterInfo.h"
     19 #include "llvm/Constants.h"
     20 #include "llvm/DerivedTypes.h"
     21 #include "llvm/Function.h"
     22 #include "llvm/CodeGen/MachineConstantPool.h"
     23 #include "llvm/CodeGen/MachineFunction.h"
     24 #include "llvm/CodeGen/MachineInstrBuilder.h"
     25 using namespace llvm;
     26 
     27 Thumb2RegisterInfo::Thumb2RegisterInfo(const ARMBaseInstrInfo &tii,
     28                                        const ARMSubtarget &sti)
     29   : ARMBaseRegisterInfo(tii, sti) {
     30 }
     31 
     32 /// emitLoadConstPool - Emits a load from constpool to materialize the
     33 /// specified immediate.
     34 void
     35 Thumb2RegisterInfo::emitLoadConstPool(MachineBasicBlock &MBB,
     36                                       MachineBasicBlock::iterator &MBBI,
     37                                       DebugLoc dl,
     38                                       unsigned DestReg, unsigned SubIdx,
     39                                       int Val,
     40                                       ARMCC::CondCodes Pred, unsigned PredReg,
     41                                       unsigned MIFlags) const {
     42   MachineFunction &MF = *MBB.getParent();
     43   MachineConstantPool *ConstantPool = MF.getConstantPool();
     44   const Constant *C = ConstantInt::get(
     45            Type::getInt32Ty(MBB.getParent()->getFunction()->getContext()), Val);
     46   unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
     47 
     48   BuildMI(MBB, MBBI, dl, TII.get(ARM::t2LDRpci))
     49     .addReg(DestReg, getDefRegState(true), SubIdx)
     50     .addConstantPoolIndex(Idx).addImm((int64_t)ARMCC::AL).addReg(0)
     51     .setMIFlags(MIFlags);
     52 }
     53