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"
27 // FIXME: Add the subtarget support on this constructor.
28 PIC16InstrInfo::PIC16InstrInfo(PIC16TargetMachine &tm)
29 : TargetInstrInfoImpl(PIC16Insts, array_lengthof(PIC16Insts)),
31 RegInfo(*this, *TM.getSubtargetImpl()) {}
34 /// isStoreToStackSlot - If the specified machine instruction is a direct
35 /// store to a stack slot, return the virtual or physical register number of
36 /// the source reg along with the FrameIndex of the loaded stack slot.
37 /// If not, return 0. This predicate must return 0 if the instruction has
38 /// any side effects other than storing to the stack slot.
39 unsigned PIC16InstrInfo::isStoreToStackSlot(const MachineInstr *MI,
40 int &FrameIndex) const {
41 if (MI->getOpcode() == PIC16::movwf
42 && MI->getOperand(0).isReg()
43 && MI->getOperand(1).isSymbol()) {
44 FrameIndex = MI->getOperand(1).getIndex();
45 return MI->getOperand(0).getReg();
50 /// isLoadFromStackSlot - If the specified machine instruction is a direct
51 /// load from a stack slot, return the virtual or physical register number of
52 /// the dest reg along with the FrameIndex of the stack slot.
53 /// If not, return 0. This predicate must return 0 if the instruction has
54 /// any side effects other than storing to the stack slot.
55 unsigned PIC16InstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
56 int &FrameIndex) const {
57 if (MI->getOpcode() == PIC16::movf
58 && MI->getOperand(0).isReg()
59 && MI->getOperand(1).isSymbol()) {
60 FrameIndex = MI->getOperand(1).getIndex();
61 return MI->getOperand(0).getReg();
67 void PIC16InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
68 MachineBasicBlock::iterator I,
69 unsigned SrcReg, bool isKill, int FI,
70 const TargetRegisterClass *RC) const {
72 const Function *Func = MBB.getParent()->getFunction();
73 const std::string FuncName = Func->getName();
75 char *tmpName = new char [strlen(FuncName.c_str()) + 6];
76 sprintf(tmpName, "%s.tmp", FuncName.c_str());
78 // On the order of operands here: think "movwf SrcReg, tmp_slot, offset".
79 if (RC == PIC16::GPRRegisterClass) {
80 //MachineFunction &MF = *MBB.getParent();
81 //MachineRegisterInfo &RI = MF.getRegInfo();
82 BuildMI(MBB, I, get(PIC16::movwf))
83 .addReg(SrcReg, false, false, isKill)
85 .addExternalSymbol(tmpName)
86 .addImm(1); // Emit banksel for it.
88 else if (RC == PIC16::FSR16RegisterClass)
89 assert(0 && "Don't know yet how to store a FSR16 to stack slot");
91 assert(0 && "Can't store this register to stack slot");
94 void PIC16InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
95 MachineBasicBlock::iterator I,
96 unsigned DestReg, int FI,
97 const TargetRegisterClass *RC) const {
99 const Function *Func = MBB.getParent()->getFunction();
100 const std::string FuncName = Func->getName();
102 char *tmpName = new char [strlen(FuncName.c_str()) + 6];
103 sprintf(tmpName, "%s.tmp", FuncName.c_str());
105 // On the order of operands here: think "movf FrameIndex, W".
106 if (RC == PIC16::GPRRegisterClass) {
107 //MachineFunction &MF = *MBB.getParent();
108 //MachineRegisterInfo &RI = MF.getRegInfo();
109 BuildMI(MBB, I, get(PIC16::movf), DestReg)
111 .addExternalSymbol(tmpName)
112 .addImm(1); // Emit banksel for it.
114 else if (RC == PIC16::FSR16RegisterClass)
115 assert(0 && "Don't know yet how to load an FSR16 from stack slot");
117 assert(0 && "Can't load this register from stack slot");
120 bool PIC16InstrInfo::copyRegToReg (MachineBasicBlock &MBB,
121 MachineBasicBlock::iterator I,
122 unsigned DestReg, unsigned SrcReg,
123 const TargetRegisterClass *DestRC,
124 const TargetRegisterClass *SrcRC) const {
125 if (DestRC == PIC16::FSR16RegisterClass) {
126 BuildMI(MBB, I, get(PIC16::copy_fsr), DestReg).addReg(SrcReg);
132 bool PIC16InstrInfo::isMoveInstr(const MachineInstr &MI,
134 unsigned &DestReg) const {
136 if (MI.getOpcode() == PIC16::copy_fsr) {
137 DestReg = MI.getOperand(0).getReg();
138 SrcReg = MI.getOperand(1).getReg();