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//===-- MipsISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Mips --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the MIPS target.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-isel"
#include "MipsISelDAGToDAG.h"
#include "Mips16ISelDAGToDAG.h"
#include "MipsSEISelDAGToDAG.h"
#include "Mips.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "MipsMachineFunction.h"
#include "MipsRegisterInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// MipsDAGToDAGISel - MIPS specific code to select MIPS machine
// instructions for SelectionDAG operations.
//===----------------------------------------------------------------------===//
bool MipsDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
bool Ret = SelectionDAGISel::runOnMachineFunction(MF);
processFunctionAfterISel(MF);
return Ret;
}
/// getGlobalBaseReg - Output the instructions required to put the
/// GOT address into a register.
SDNode *MipsDAGToDAGISel::getGlobalBaseReg() {
unsigned GlobalBaseReg = MF->getInfo<MipsFunctionInfo>()->getGlobalBaseReg();
return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
}
/// ComplexPattern used on MipsInstrInfo
/// Used on Mips Load/Store instructions
bool MipsDAGToDAGISel::selectAddrRegImm(SDValue Addr, SDValue &Base,
SDValue &Offset) const {
llvm_unreachable("Unimplemented function.");
return false;
}
bool MipsDAGToDAGISel::selectAddrDefault(SDValue Addr, SDValue &Base,
SDValue &Offset) const {
llvm_unreachable("Unimplemented function.");
return false;
}
bool MipsDAGToDAGISel::selectIntAddr(SDValue Addr, SDValue &Base,
SDValue &Offset) const {
llvm_unreachable("Unimplemented function.");
return false;
}
bool MipsDAGToDAGISel::selectAddr16(SDNode *Parent, SDValue N, SDValue &Base,
SDValue &Offset, SDValue &Alias) {
llvm_unreachable("Unimplemented function.");
return false;
}
/// Select instructions not customized! Used for
/// expanded, promoted and normal instructions
SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
unsigned Opcode = Node->getOpcode();
// Dump information about the Node being selected
DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
// If we have a custom node, we already have selected!
if (Node->isMachineOpcode()) {
DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
return NULL;
}
// See if subclasses can handle this node.
std::pair<bool, SDNode*> Ret = selectNode(Node);
if (Ret.first)
return Ret.second;
switch(Opcode) {
default: break;
// Get target GOT address.
case ISD::GLOBAL_OFFSET_TABLE:
return getGlobalBaseReg();
#ifndef NDEBUG
case ISD::LOAD:
case ISD::STORE:
assert(cast<MemSDNode>(Node)->getMemoryVT().getSizeInBits() / 8 <=
cast<MemSDNode>(Node)->getAlignment() &&
"Unexpected unaligned loads/stores.");
break;
#endif
}
// Select the default instruction
SDNode *ResNode = SelectCode(Node);
DEBUG(errs() << "=> ");
if (ResNode == NULL || ResNode == Node)
DEBUG(Node->dump(CurDAG));
else
DEBUG(ResNode->dump(CurDAG));
DEBUG(errs() << "\n");
return ResNode;
}
bool MipsDAGToDAGISel::
SelectInlineAsmMemoryOperand(const SDValue &Op, char ConstraintCode,
std::vector<SDValue> &OutOps) {
assert(ConstraintCode == 'm' && "unexpected asm memory constraint");
OutOps.push_back(Op);
return false;
}
/// createMipsISelDag - This pass converts a legalized DAG into a
/// MIPS-specific DAG, ready for instruction scheduling.
FunctionPass *llvm::createMipsISelDag(MipsTargetMachine &TM) {
if (TM.getSubtargetImpl()->inMips16Mode())
return llvm::createMips16ISelDag(TM);
return llvm::createMipsSEISelDag(TM);
}
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