src/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCInst.cpp

   1 //===- HexagonMCInst.cpp - Hexagon sub-class of MCInst --------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This class extends MCInst to allow some Hexagon VLIW annotations.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "HexagonInstrInfo.h"
  15 #include "MCTargetDesc/HexagonBaseInfo.h"
  16 #include "MCTargetDesc/HexagonMCInst.h"
  17 #include "MCTargetDesc/HexagonMCTargetDesc.h"
  18
  19 using namespace llvm;
  20
  21 std::unique_ptr <MCInstrInfo const> HexagonMCInst::MCII;
  22
  23 HexagonMCInst::HexagonMCInst() : MCInst() {}
  24 HexagonMCInst::HexagonMCInst(MCInstrDesc const &mcid) : MCInst() {}
  25
  26 void HexagonMCInst::AppendImplicitOperands(MCInst &MCI) {
  27   MCI.addOperand(MCOperand::CreateImm(0));
  28   MCI.addOperand(MCOperand::CreateInst(nullptr));
  29 }
  30
  31 std::bitset<16> HexagonMCInst::GetImplicitBits(MCInst const &MCI) {
  32   SanityCheckImplicitOperands(MCI);
  33   std::bitset<16> Bits(MCI.getOperand(MCI.getNumOperands() - 2).getImm());
  34   return Bits;
  35 }
  36
  37 void HexagonMCInst::SetImplicitBits(MCInst &MCI, std::bitset<16> Bits) {
  38   SanityCheckImplicitOperands(MCI);
  39   MCI.getOperand(MCI.getNumOperands() - 2).setImm(Bits.to_ulong());
  40 }
  41
  42 void HexagonMCInst::setPacketBegin(bool f) {
  43   std::bitset<16> Bits(GetImplicitBits(*this));
  44   Bits.set(packetBeginIndex, f);
  45   SetImplicitBits(*this, Bits);
  46 }
  47
  48 bool HexagonMCInst::isPacketBegin() const {
  49   std::bitset<16> Bits(GetImplicitBits(*this));
  50   return Bits.test(packetBeginIndex);
  51 }
  52
  53 void HexagonMCInst::setPacketEnd(bool f) {
  54   std::bitset<16> Bits(GetImplicitBits(*this));
  55   Bits.set(packetEndIndex, f);
  56   SetImplicitBits(*this, Bits);
  57 }
  58
  59 bool HexagonMCInst::isPacketEnd() const {
  60   std::bitset<16> Bits(GetImplicitBits(*this));
  61   return Bits.test(packetEndIndex);
  62 }
  63
  64 void HexagonMCInst::resetPacket() {
  65   setPacketBegin(false);
  66   setPacketEnd(false);
  67 }
  68
  69 // Return the slots used by the insn.
  70 unsigned HexagonMCInst::getUnits(const HexagonTargetMachine *TM) const {
  71   const HexagonInstrInfo *QII = TM->getSubtargetImpl()->getInstrInfo();
  72   const InstrItineraryData *II =
  73       TM->getSubtargetImpl()->getInstrItineraryData();
  74   const InstrStage *IS =
  75       II->beginStage(QII->get(this->getOpcode()).getSchedClass());
  76
  77   return (IS->getUnits());
  78 }
  79
  80 MCInstrDesc const& HexagonMCInst::getDesc() const { return (MCII->get(getOpcode())); }
  81
  82 // Return the Hexagon ISA class for the insn.
  83 unsigned HexagonMCInst::getType() const {
  84   const uint64_t F = getDesc().TSFlags;
  85
  86   return ((F >> HexagonII::TypePos) & HexagonII::TypeMask);
  87 }
  88
  89 // Return whether the insn is an actual insn.
  90 bool HexagonMCInst::isCanon() const {
  91   return (!getDesc().isPseudo() && !isPrefix() &&
  92           getType() != HexagonII::TypeENDLOOP);
  93 }
  94
  95 // Return whether the insn is a prefix.
  96 bool HexagonMCInst::isPrefix() const {
  97   return (getType() == HexagonII::TypePREFIX);
  98 }
  99
 100 // Return whether the insn is solo, i.e., cannot be in a packet.
 101 bool HexagonMCInst::isSolo() const {
 102   const uint64_t F = getDesc().TSFlags;
 103   return ((F >> HexagonII::SoloPos) & HexagonII::SoloMask);
 104 }
 105
 106 // Return whether the insn is a new-value consumer.
 107 bool HexagonMCInst::isNewValue() const {
 108   const uint64_t F = getDesc().TSFlags;
 109   return ((F >> HexagonII::NewValuePos) & HexagonII::NewValueMask);
 110 }
 111
 112 // Return whether the instruction is a legal new-value producer.
 113 bool HexagonMCInst::hasNewValue() const {
 114   const uint64_t F = getDesc().TSFlags;
 115   return ((F >> HexagonII::hasNewValuePos) & HexagonII::hasNewValueMask);
 116 }
 117
 118 // Return the operand that consumes or produces a new value.
 119 const MCOperand &HexagonMCInst::getNewValue() const {
 120   const uint64_t F = getDesc().TSFlags;
 121   const unsigned O =
 122       (F >> HexagonII::NewValueOpPos) & HexagonII::NewValueOpMask;
 123   const MCOperand &MCO = getOperand(O);
 124
 125   assert((isNewValue() || hasNewValue()) && MCO.isReg());
 126   return (MCO);
 127 }
 128
 129 // Return whether the instruction needs to be constant extended.
 130 // 1) Always return true if the instruction has 'isExtended' flag set.
 131 //
 132 // isExtendable:
 133 // 2) For immediate extended operands, return true only if the value is
 134 //    out-of-range.
 135 // 3) For global address, always return true.
 136
 137 bool HexagonMCInst::isConstExtended(void) const {
 138   if (isExtended())
 139     return true;
 140
 141   if (!isExtendable())
 142     return false;
 143
 144   short ExtOpNum = getCExtOpNum();
 145   int MinValue = getMinValue();
 146   int MaxValue = getMaxValue();
 147   const MCOperand &MO = getOperand(ExtOpNum);
 148
 149   // We could be using an instruction with an extendable immediate and shoehorn
 150   // a global address into it. If it is a global address it will be constant
 151   // extended. We do this for COMBINE.
 152   // We currently only handle isGlobal() because it is the only kind of
 153   // object we are going to end up with here for now.
 154   // In the future we probably should add isSymbol(), etc.
 155   if (MO.isExpr())
 156     return true;
 157
 158   // If the extendable operand is not 'Immediate' type, the instruction should
 159   // have 'isExtended' flag set.
 160   assert(MO.isImm() && "Extendable operand must be Immediate type");
 161
 162   int ImmValue = MO.getImm();
 163   return (ImmValue < MinValue || ImmValue > MaxValue);
 164 }
 165
 166 // Return whether the instruction must be always extended.
 167 bool HexagonMCInst::isExtended(void) const {
 168   const uint64_t F = getDesc().TSFlags;
 169   return (F >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask;
 170 }
 171
 172 // Return true if the instruction may be extended based on the operand value.
 173 bool HexagonMCInst::isExtendable(void) const {
 174   const uint64_t F = getDesc().TSFlags;
 175   return (F >> HexagonII::ExtendablePos) & HexagonII::ExtendableMask;
 176 }
 177
 178 // Return number of bits in the constant extended operand.
 179 unsigned HexagonMCInst::getBitCount(void) const {
 180   const uint64_t F = getDesc().TSFlags;
 181   return ((F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask);
 182 }
 183
 184 // Return constant extended operand number.
 185 unsigned short HexagonMCInst::getCExtOpNum(void) const {
 186   const uint64_t F = getDesc().TSFlags;
 187   return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask);
 188 }
 189
 190 // Return whether the operand can be constant extended.
 191 bool HexagonMCInst::isOperandExtended(const unsigned short OperandNum) const {
 192   const uint64_t F = getDesc().TSFlags;
 193   return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask) ==
 194          OperandNum;
 195 }
 196
 197 // Return the min value that a constant extendable operand can have
 198 // without being extended.
 199 int HexagonMCInst::getMinValue(void) const {
 200   const uint64_t F = getDesc().TSFlags;
 201   unsigned isSigned =
 202       (F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
 203   unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
 204
 205   if (isSigned) // if value is signed
 206     return -1U << (bits - 1);
 207   else
 208     return 0;
 209 }
 210
 211 // Return the max value that a constant extendable operand can have
 212 // without being extended.
 213 int HexagonMCInst::getMaxValue(void) const {
 214   const uint64_t F = getDesc().TSFlags;
 215   unsigned isSigned =
 216       (F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
 217   unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
 218
 219   if (isSigned) // if value is signed
 220     return ~(-1U << (bits - 1));
 221   else
 222     return ~(-1U << bits);
 223 }