lib/Target/ARM/Thumb2RegisterInfo.cpp

   1 //===-- Thumb2RegisterInfo.cpp - Thumb-2 Register 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 Thumb-2 implementation of the TargetRegisterInfo
  11 // class.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "Thumb2RegisterInfo.h"
  16 #include "ARM.h"
  17 #include "ARMSubtarget.h"
  18 #include "llvm/CodeGen/MachineConstantPool.h"
  19 #include "llvm/CodeGen/MachineFunction.h"
  20 #include "llvm/CodeGen/MachineInstrBuilder.h"
  21 #include "llvm/IR/Constants.h"
  22 #include "llvm/IR/DerivedTypes.h"
  23 #include "llvm/IR/Function.h"
  24 #include "llvm/Target/TargetInstrInfo.h"
  25 #include "llvm/Target/TargetMachine.h"
  26 using namespace llvm;
  27
  28 Thumb2RegisterInfo::Thumb2RegisterInfo(const ARMSubtarget &sti)
  29   : ARMBaseRegisterInfo(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   const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
  44   MachineConstantPool *ConstantPool = MF.getConstantPool();
  45   const Constant *C = ConstantInt::get(
  46            Type::getInt32Ty(MBB.getParent()->getFunction()->getContext()), Val);
  47   unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
  48
  49   BuildMI(MBB, MBBI, dl, TII.get(ARM::t2LDRpci))
  50     .addReg(DestReg, getDefRegState(true), SubIdx)
  51     .addConstantPoolIndex(Idx).addImm((int64_t)ARMCC::AL).addReg(0)
  52     .setMIFlags(MIFlags);
  53 }