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//===- HexagonMCInstrInfo.cpp - Hexagon sub-class of MCInst ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class extends MCInstrInfo to allow Hexagon specific MCInstr queries
//
//===----------------------------------------------------------------------===//
#include "HexagonMCInstrInfo.h"
#include "HexagonBaseInfo.h"
namespace llvm {
void HexagonMCInstrInfo::AppendImplicitOperands(MCInst &MCI) {
MCI.addOperand(MCOperand::CreateImm(0));
MCI.addOperand(MCOperand::CreateInst(nullptr));
}
unsigned HexagonMCInstrInfo::getBitCount(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask);
}
// Return constant extended operand number.
unsigned short HexagonMCInstrInfo::getCExtOpNum(MCInstrInfo const &MCII,
MCInst const &MCI) {
const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask);
}
MCInstrDesc const &HexagonMCInstrInfo::getDesc(MCInstrInfo const &MCII,
MCInst const &MCI) {
return (MCII.get(MCI.getOpcode()));
}
std::bitset<16> HexagonMCInstrInfo::GetImplicitBits(MCInst const &MCI) {
SanityCheckImplicitOperands(MCI);
std::bitset<16> Bits(MCI.getOperand(MCI.getNumOperands() - 2).getImm());
return Bits;
}
// Return the max value that a constant extendable operand can have
// without being extended.
int HexagonMCInstrInfo::getMaxValue(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
unsigned isSigned =
(F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
if (isSigned) // if value is signed
return ~(-1U << (bits - 1));
else
return ~(-1U << bits);
}
// Return the min value that a constant extendable operand can have
// without being extended.
int HexagonMCInstrInfo::getMinValue(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
unsigned isSigned =
(F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
if (isSigned) // if value is signed
return -1U << (bits - 1);
else
return 0;
}
// Return the operand that consumes or produces a new value.
MCOperand const &HexagonMCInstrInfo::getNewValue(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
unsigned const O =
(F >> HexagonII::NewValueOpPos) & HexagonII::NewValueOpMask;
MCOperand const &MCO = MCI.getOperand(O);
assert((HexagonMCInstrInfo::isNewValue(MCII, MCI) ||
HexagonMCInstrInfo::hasNewValue(MCII, MCI)) &&
MCO.isReg());
return (MCO);
}
// Return the Hexagon ISA class for the insn.
unsigned HexagonMCInstrInfo::getType(MCInstrInfo const &MCII,
MCInst const &MCI) {
const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::TypePos) & HexagonII::TypeMask);
}
// Return whether the instruction is a legal new-value producer.
bool HexagonMCInstrInfo::hasNewValue(MCInstrInfo const &MCII,
MCInst const &MCI) {
const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::hasNewValuePos) & HexagonII::hasNewValueMask);
}
// Return whether the insn is an actual insn.
bool HexagonMCInstrInfo::isCanon(MCInstrInfo const &MCII, MCInst const &MCI) {
return (!HexagonMCInstrInfo::getDesc(MCII, MCI).isPseudo() &&
!HexagonMCInstrInfo::isPrefix(MCII, MCI) &&
HexagonMCInstrInfo::getType(MCII, MCI) != HexagonII::TypeENDLOOP);
}
// Return whether the instruction needs to be constant extended.
// 1) Always return true if the instruction has 'isExtended' flag set.
//
// isExtendable:
// 2) For immediate extended operands, return true only if the value is
// out-of-range.
// 3) For global address, always return true.
bool HexagonMCInstrInfo::isConstExtended(MCInstrInfo const &MCII,
MCInst const &MCI) {
if (HexagonMCInstrInfo::isExtended(MCII, MCI))
return true;
if (!HexagonMCInstrInfo::isExtendable(MCII, MCI))
return false;
short ExtOpNum = HexagonMCInstrInfo::getCExtOpNum(MCII, MCI);
int MinValue = HexagonMCInstrInfo::getMinValue(MCII, MCI);
int MaxValue = HexagonMCInstrInfo::getMaxValue(MCII, MCI);
MCOperand const &MO = MCI.getOperand(ExtOpNum);
// We could be using an instruction with an extendable immediate and shoehorn
// a global address into it. If it is a global address it will be constant
// extended. We do this for COMBINE.
// We currently only handle isGlobal() because it is the only kind of
// object we are going to end up with here for now.
// In the future we probably should add isSymbol(), etc.
if (MO.isExpr())
return true;
// If the extendable operand is not 'Immediate' type, the instruction should
// have 'isExtended' flag set.
assert(MO.isImm() && "Extendable operand must be Immediate type");
int ImmValue = MO.getImm();
return (ImmValue < MinValue || ImmValue > MaxValue);
}
// Return true if the instruction may be extended based on the operand value.
bool HexagonMCInstrInfo::isExtendable(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return (F >> HexagonII::ExtendablePos) & HexagonII::ExtendableMask;
}
// Return whether the instruction must be always extended.
bool HexagonMCInstrInfo::isExtended(MCInstrInfo const &MCII,
MCInst const &MCI) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return (F >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask;
}
// Return whether the insn is a new-value consumer.
bool HexagonMCInstrInfo::isNewValue(MCInstrInfo const &MCII,
MCInst const &MCI) {
const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::NewValuePos) & HexagonII::NewValueMask);
}
// Return whether the operand can be constant extended.
bool HexagonMCInstrInfo::isOperandExtended(MCInstrInfo const &MCII,
MCInst const &MCI,
unsigned short OperandNum) {
uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask) ==
OperandNum;
}
bool HexagonMCInstrInfo::isPacketBegin(MCInst const &MCI) {
std::bitset<16> Bits(GetImplicitBits(MCI));
return Bits.test(packetBeginIndex);
}
bool HexagonMCInstrInfo::isPacketEnd(MCInst const &MCI) {
std::bitset<16> Bits(GetImplicitBits(MCI));
return Bits.test(packetEndIndex);
}
// Return whether the insn is a prefix.
bool HexagonMCInstrInfo::isPrefix(MCInstrInfo const &MCII, MCInst const &MCI) {
return (HexagonMCInstrInfo::getType(MCII, MCI) == HexagonII::TypePREFIX);
}
// Return whether the insn is solo, i.e., cannot be in a packet.
bool HexagonMCInstrInfo::isSolo(MCInstrInfo const &MCII, MCInst const &MCI) {
const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
return ((F >> HexagonII::SoloPos) & HexagonII::SoloMask);
}
void HexagonMCInstrInfo::resetPacket(MCInst &MCI) {
setPacketBegin(MCI, false);
setPacketEnd(MCI, false);
}
void HexagonMCInstrInfo::SetImplicitBits(MCInst &MCI, std::bitset<16> Bits) {
SanityCheckImplicitOperands(MCI);
MCI.getOperand(MCI.getNumOperands() - 2).setImm(Bits.to_ulong());
}
void HexagonMCInstrInfo::setPacketBegin(MCInst &MCI, bool f) {
std::bitset<16> Bits(GetImplicitBits(MCI));
Bits.set(packetBeginIndex, f);
SetImplicitBits(MCI, Bits);
}
void HexagonMCInstrInfo::setPacketEnd(MCInst &MCI, bool f) {
std::bitset<16> Bits(GetImplicitBits(MCI));
Bits.set(packetEndIndex, f);
SetImplicitBits(MCI, Bits);
}
}
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