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//===- PIC16InstrInfo.cpp - PIC16 Instruction Information -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the PIC16 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "PIC16.h"
#include "PIC16InstrInfo.h"
#include "llvm/Function.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "PIC16GenInstrInfo.inc"
using namespace llvm;
// TODO: Add the subtarget support on this constructor.
PIC16InstrInfo::PIC16InstrInfo(PIC16TargetMachine &tm)
: TargetInstrInfoImpl(PIC16Insts, array_lengthof(PIC16Insts)),
TM(tm), RI(*this) {}
static bool isZeroImm(const MachineOperand &op) {
return op.isImmediate() && op.getImm() == 0;
}
/// isLoadFromStackSlot - If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
unsigned PIC16InstrInfo::
isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const
{
if (MI->getOpcode() == PIC16::MOVF) {
if ((MI->getOperand(2).isFrameIndex()) && // is a stack slot
(MI->getOperand(1).isImmediate()) && // the imm is zero
(isZeroImm(MI->getOperand(1)))) {
FrameIndex = MI->getOperand(2).getIndex();
return MI->getOperand(0).getReg();
}
}
return 0;
}
/// isStoreToStackSlot - If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
unsigned PIC16InstrInfo::
isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const
{
if (MI->getOpcode() == PIC16::MOVWF) {
if ((MI->getOperand(0).isFrameIndex()) && // is a stack slot
(MI->getOperand(1).isImmediate()) && // the imm is zero
(isZeroImm(MI->getOperand(1)))) {
FrameIndex = MI->getOperand(0).getIndex();
return MI->getOperand(2).getReg();
}
}
return 0;
}
void PIC16InstrInfo::
storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned SrcReg, bool isKill, int FI,
const TargetRegisterClass *RC) const {
const Function *Func = MBB.getParent()->getFunction();
const std::string FuncName = Func->getName();
char *tmpName = new char [strlen(FuncName.c_str()) + 6];
sprintf(tmpName, "%s_tmp_%d",FuncName.c_str(),FI);
if (RC == PIC16::CPURegsRegisterClass) {
//src is always WREG.
BuildMI(MBB, I, this->get(PIC16::MOVWF))
.addReg(SrcReg,false,false,true,true)
.addExternalSymbol(tmpName) // the current printer expects 3 operands,
.addExternalSymbol(tmpName); // all we need is actually one,
// so we repeat.
}
else
assert(0 && "Can't store this register to stack slot");
}
void PIC16InstrInfo::
loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned DestReg, int FI,
const TargetRegisterClass *RC) const
{
const Function *Func = MBB.getParent()->getFunction();
const std::string FuncName = Func->getName();
char *tmpName = new char [strlen(FuncName.c_str()) + 6];
sprintf(tmpName, "%s_tmp_%d",FuncName.c_str(),FI);
if (RC == PIC16::CPURegsRegisterClass)
BuildMI(MBB, I, this->get(PIC16::MOVF), DestReg)
.addExternalSymbol(tmpName) // the current printer expects 3 operands,
.addExternalSymbol(tmpName); // all we need is actually one,so we repeat.
else
assert(0 && "Can't load this register from stack slot");
}
/// InsertBranch - Insert a branch into the end of the specified
/// MachineBasicBlock. This operands to this method are the same as those
/// returned by AnalyzeBranch. This is invoked in cases where AnalyzeBranch
/// returns success and when an unconditional branch (TBB is non-null, FBB is
/// null, Cond is empty) needs to be inserted. It returns the number of
/// instructions inserted.
unsigned PIC16InstrInfo::
InsertBranch(MachineBasicBlock &MBB,
MachineBasicBlock *TBB, MachineBasicBlock *FBB,
const std::vector<MachineOperand> &Cond) const
{
// Shouldn't be a fall through.
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
if (FBB == 0) { // One way branch.
if (Cond.empty()) {
// Unconditional branch?
BuildMI(&MBB, get(PIC16::GOTO)).addMBB(TBB);
}
return 1;
}
// TODO: If the there are some conditions specified then conditional branch
// should be generated.
// For the time being no instruction is being generated therefore
// returning NULL.
return 0;
}