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 "ARMBaseInstrInfo.h"
18 #include "ARMSubtarget.h"
19 #include "llvm/CodeGen/MachineConstantPool.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/IR/Constants.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/Function.h"
25 using namespace llvm;
26
Thumb2RegisterInfo(const ARMSubtarget & sti)27 Thumb2RegisterInfo::Thumb2RegisterInfo(const ARMSubtarget &sti)
28 : ARMBaseRegisterInfo(sti) {
29 }
30
31 /// emitLoadConstPool - Emits a load from constpool to materialize the
32 /// specified immediate.
33 void
emitLoadConstPool(MachineBasicBlock & MBB,MachineBasicBlock::iterator & MBBI,DebugLoc dl,unsigned DestReg,unsigned SubIdx,int Val,ARMCC::CondCodes Pred,unsigned PredReg,unsigned MIFlags) const34 Thumb2RegisterInfo::emitLoadConstPool(MachineBasicBlock &MBB,
35 MachineBasicBlock::iterator &MBBI,
36 DebugLoc dl,
37 unsigned DestReg, unsigned SubIdx,
38 int Val,
39 ARMCC::CondCodes Pred, unsigned PredReg,
40 unsigned MIFlags) const {
41 MachineFunction &MF = *MBB.getParent();
42 const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
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