1 //===- PIC16InstrInfo.cpp - PIC16 Instruction Information -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the PIC16 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
15 #include "PIC16InstrInfo.h"
16 #include "PIC16TargetMachine.h"
17 #include "PIC16GenInstrInfo.inc"
18 #include "llvm/Function.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
28 // FIXME: Add the subtarget support on this constructor.
29 PIC16InstrInfo::PIC16InstrInfo(PIC16TargetMachine &tm)
30 : TargetInstrInfoImpl(PIC16Insts, array_lengthof(PIC16Insts)),
32 RegInfo(*this, *TM.getSubtargetImpl()) {}
35 /// isStoreToStackSlot - If the specified machine instruction is a direct
36 /// store to a stack slot, return the virtual or physical register number of
37 /// the source reg along with the FrameIndex of the loaded stack slot.
38 /// If not, return 0. This predicate must return 0 if the instruction has
39 /// any side effects other than storing to the stack slot.
40 unsigned PIC16InstrInfo::isStoreToStackSlot(const MachineInstr *MI,
41 int &FrameIndex) const {
42 if (MI->getOpcode() == PIC16::movwf
43 && MI->getOperand(0).isReg()
44 && MI->getOperand(1).isSymbol()) {
45 FrameIndex = MI->getOperand(1).getIndex();
46 return MI->getOperand(0).getReg();
51 /// isLoadFromStackSlot - If the specified machine instruction is a direct
52 /// load from a stack slot, return the virtual or physical register number of
53 /// the dest reg along with the FrameIndex of the stack slot.
54 /// If not, return 0. This predicate must return 0 if the instruction has
55 /// any side effects other than storing to the stack slot.
56 unsigned PIC16InstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
57 int &FrameIndex) const {
58 if (MI->getOpcode() == PIC16::movf
59 && MI->getOperand(0).isReg()
60 && MI->getOperand(1).isSymbol()) {
61 FrameIndex = MI->getOperand(1).getIndex();
62 return MI->getOperand(0).getReg();
68 void PIC16InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
69 MachineBasicBlock::iterator I,
70 unsigned SrcReg, bool isKill, int FI,
71 const TargetRegisterClass *RC) const {
73 const Function *Func = MBB.getParent()->getFunction();
74 const std::string FuncName = Func->getName();
76 char *tmpName = new char [strlen(FuncName.c_str()) + 6];
77 sprintf(tmpName, "%s.tmp", FuncName.c_str());
79 // On the order of operands here: think "movwf SrcReg, tmp_slot, offset".
80 if (RC == PIC16::GPRRegisterClass) {
81 //MachineFunction &MF = *MBB.getParent();
82 //MachineRegisterInfo &RI = MF.getRegInfo();
83 BuildMI(MBB, I, get(PIC16::movwf))
84 .addReg(SrcReg, false, false, isKill)
86 .addExternalSymbol(tmpName)
87 .addImm(1); // Emit banksel for it.
89 else if (RC == PIC16::FSR16RegisterClass)
90 assert(0 && "Don't know yet how to store a FSR16 to stack slot");
92 assert(0 && "Can't store this register to stack slot");
95 void PIC16InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
96 MachineBasicBlock::iterator I,
97 unsigned DestReg, int FI,
98 const TargetRegisterClass *RC) const {
100 const Function *Func = MBB.getParent()->getFunction();
101 const std::string FuncName = Func->getName();
103 char *tmpName = new char [strlen(FuncName.c_str()) + 6];
104 sprintf(tmpName, "%s.tmp", FuncName.c_str());
106 // On the order of operands here: think "movf FrameIndex, W".
107 if (RC == PIC16::GPRRegisterClass) {
108 //MachineFunction &MF = *MBB.getParent();
109 //MachineRegisterInfo &RI = MF.getRegInfo();
110 BuildMI(MBB, I, get(PIC16::movf), DestReg)
112 .addExternalSymbol(tmpName)
113 .addImm(1); // Emit banksel for it.
115 else if (RC == PIC16::FSR16RegisterClass)
116 assert(0 && "Don't know yet how to load an FSR16 from stack slot");
118 assert(0 && "Can't load this register from stack slot");
121 bool PIC16InstrInfo::copyRegToReg (MachineBasicBlock &MBB,
122 MachineBasicBlock::iterator I,
123 unsigned DestReg, unsigned SrcReg,
124 const TargetRegisterClass *DestRC,
125 const TargetRegisterClass *SrcRC) const {
126 if (DestRC == PIC16::FSR16RegisterClass) {
127 BuildMI(MBB, I, get(PIC16::copy_fsr), DestReg).addReg(SrcReg);
131 if (DestRC == PIC16::GPRRegisterClass) {
132 BuildMI(MBB, I, get(PIC16::copy_w), DestReg).addReg(SrcReg);
136 // Not yet supported.
140 bool PIC16InstrInfo::isMoveInstr(const MachineInstr &MI,
142 unsigned &DestReg) const {
144 if (MI.getOpcode() == PIC16::copy_fsr
145 || MI.getOpcode() == PIC16::copy_w) {
146 DestReg = MI.getOperand(0).getReg();
147 SrcReg = MI.getOperand(1).getReg();