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//===-- HexagonMCCodeEmitter.cpp - Hexagon Target Descriptions ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "MCTargetDesc/HexagonBaseInfo.h"
#include "MCTargetDesc/HexagonMCCodeEmitter.h"
#include "MCTargetDesc/HexagonMCTargetDesc.h"
#include "MCTargetDesc/HexagonMCInst.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "mccodeemitter"
using namespace llvm;
using namespace Hexagon;
STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
namespace {
/// \brief 10.6 Instruction Packets
/// Possible values for instruction packet parse field.
enum class ParseField { duplex = 0x0, last0 = 0x1, last1 = 0x2, end = 0x3 };
/// \brief Returns the packet bits based on instruction position.
uint32_t getPacketBits(HexagonMCInst const &HMI) {
unsigned const ParseFieldOffset = 14;
ParseField Field = HMI.isPacketEnd() ? ParseField::end : ParseField::last0;
return static_cast <uint32_t> (Field) << ParseFieldOffset;
}
void emitLittleEndian(uint64_t Binary, raw_ostream &OS) {
OS << static_cast<uint8_t>((Binary >> 0x00) & 0xff);
OS << static_cast<uint8_t>((Binary >> 0x08) & 0xff);
OS << static_cast<uint8_t>((Binary >> 0x10) & 0xff);
OS << static_cast<uint8_t>((Binary >> 0x18) & 0xff);
}
}
HexagonMCCodeEmitter::HexagonMCCodeEmitter(MCInstrInfo const &aMII,
MCSubtargetInfo const &aMST,
MCContext &aMCT)
: MST(aMST), MCT(aMCT) {}
void HexagonMCCodeEmitter::EncodeInstruction(MCInst const &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
MCSubtargetInfo const &STI) const {
HexagonMCInst const &HMB = static_cast<HexagonMCInst const &>(MI);
uint64_t Binary = getBinaryCodeForInstr(HMB, Fixups, STI) | getPacketBits(HMB);
assert(HMB.getDesc().getSize() == 4 && "All instructions should be 32bit");
emitLittleEndian(Binary, OS);
++MCNumEmitted;
}
unsigned
HexagonMCCodeEmitter::getMachineOpValue(MCInst const &MI, MCOperand const &MO,
SmallVectorImpl<MCFixup> &Fixups,
MCSubtargetInfo const &STI) const {
if (MO.isReg())
return MCT.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm())
return static_cast<unsigned>(MO.getImm());
llvm_unreachable("Only Immediates and Registers implemented right now");
}
MCSubtargetInfo const &HexagonMCCodeEmitter::getSubtargetInfo() const {
return MST;
}
MCCodeEmitter *llvm::createHexagonMCCodeEmitter(MCInstrInfo const &MII,
MCRegisterInfo const &MRI,
MCSubtargetInfo const &MST,
MCContext &MCT) {
return new HexagonMCCodeEmitter(MII, MST, MCT);
}
#include "HexagonGenMCCodeEmitter.inc"
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