#include <instructions.hh>

Inheritance diagram for gem5::VegaISA::Inst_DS__DS_SWIZZLE_B32:

Public Member Functions
	Inst_DS__DS_SWIZZLE_B32 (InFmt_DS *)

	~Inst_DS__DS_SWIZZLE_B32 ()

int	getNumOperands () override

int	numDstRegOperands () override

int	numSrcRegOperands () override

int	getOperandSize (int opIdx) override

void	execute (GPUDynInstPtr) override

Public Member Functions inherited from gem5::VegaISA::Inst_DS
	Inst_DS (InFmt_DS *, const std::string &opcode)

	~Inst_DS ()

int	instSize () const override

void	generateDisassembly () override

void	initOperandInfo () override

Public Member Functions inherited from gem5::VegaISA::VEGAGPUStaticInst
	VEGAGPUStaticInst (const std::string &opcode)

	~VEGAGPUStaticInst ()

void	generateDisassembly () override

bool	isFlatScratchRegister (int opIdx) override

bool	isExecMaskRegister (int opIdx) override

void	initOperandInfo () override

int	getOperandSize (int opIdx) override

int	coalescerTokenCount () const override
	Return the number of tokens needed by the coalescer.

ScalarRegU32	srcLiteral () const override

Public Member Functions inherited from gem5::GPUStaticInst
	GPUStaticInst (const std::string &opcode)

virtual	~GPUStaticInst ()

void	instAddr (int inst_addr)

int	instAddr () const

int	nextInstAddr () const

void	instNum (int num)

int	instNum ()

void	ipdInstNum (int num)

int	ipdInstNum () const

void	initDynOperandInfo (Wavefront wf, ComputeUnit cu)

const std::string &	disassemble ()

int	numSrcVecOperands ()

int	numDstVecOperands ()

int	numSrcVecDWords ()

int	numDstVecDWords ()

int	numSrcScalarOperands ()

int	numDstScalarOperands ()

int	numSrcScalarDWords ()

int	numDstScalarDWords ()

int	maxOperandSize ()

bool	isALU () const

bool	isBranch () const

bool	isCondBranch () const

bool	isNop () const

bool	isReturn () const

bool	isEndOfKernel () const

bool	isKernelLaunch () const

bool	isSDWAInst () const

bool	isDPPInst () const

bool	isUnconditionalJump () const

bool	isSpecialOp () const

bool	isWaitcnt () const

bool	isSleep () const

bool	isBarrier () const

bool	isMemSync () const

bool	isMemRef () const

bool	isFlat () const

bool	isFlatGlobal () const

bool	isFlatScratch () const

bool	isLoad () const

bool	isStore () const

bool	isAtomic () const

bool	isAtomicNoRet () const

bool	isAtomicRet () const

bool	isScalar () const

bool	readsSCC () const

bool	writesSCC () const

bool	readsVCC () const

bool	writesVCC () const

bool	readsEXEC () const

bool	writesEXEC () const

bool	readsMode () const

bool	writesMode () const

bool	ignoreExec () const

bool	isAtomicAnd () const

bool	isAtomicOr () const

bool	isAtomicXor () const

bool	isAtomicCAS () const

bool	isAtomicExch () const

bool	isAtomicAdd () const

bool	isAtomicSub () const

bool	isAtomicInc () const

bool	isAtomicDec () const

bool	isAtomicMax () const

bool	isAtomicMin () const

bool	isArgLoad () const

bool	isGlobalMem () const

bool	isLocalMem () const

bool	isArgSeg () const

bool	isGlobalSeg () const

bool	isGroupSeg () const

bool	isKernArgSeg () const

bool	isPrivateSeg () const

bool	isReadOnlySeg () const

bool	isSpillSeg () const

bool	isGloballyCoherent () const
	Coherence domain of a memory instruction.

bool	isSystemCoherent () const

bool	isI8 () const

bool	isF16 () const

bool	isF32 () const

bool	isF64 () const

bool	isFMA () const

bool	isMAC () const

bool	isMAD () const

bool	isMFMA () const

virtual void	initiateAcc (GPUDynInstPtr gpuDynInst)

virtual void	completeAcc (GPUDynInstPtr gpuDynInst)

virtual uint32_t	getTargetPc ()

void	setFlag (Flags flag)

const std::string &	opcode () const

const std::vector< OperandInfo > &	srcOperands () const

const std::vector< OperandInfo > &	dstOperands () const

const std::vector< OperandInfo > &	srcVecRegOperands () const

const std::vector< OperandInfo > &	dstVecRegOperands () const

const std::vector< OperandInfo > &	srcScalarRegOperands () const

const std::vector< OperandInfo > &	dstScalarRegOperands () const

Additional Inherited Members
Public Types inherited from gem5::GPUStaticInst
enum	OpType { SRC_VEC , SRC_SCALAR , DST_VEC , DST_SCALAR }

typedef int(RegisterManager::*	MapRegFn) (Wavefront *, int)

Public Attributes inherited from gem5::GPUStaticInst
enums::StorageClassType	executed_as

Static Public Attributes inherited from gem5::GPUStaticInst
static uint64_t	dynamic_id_count

Protected Member Functions inherited from gem5::VegaISA::Inst_DS
template<typename T >
void	initMemRead (GPUDynInstPtr gpuDynInst, Addr offset)

template<int N>
void	initMemRead (GPUDynInstPtr gpuDynInst, Addr offset)

template<typename T >
void	initDualMemRead (GPUDynInstPtr gpuDynInst, Addr offset0, Addr offset1)

template<typename T >
void	initMemWrite (GPUDynInstPtr gpuDynInst, Addr offset)

template<int N>
void	initMemWrite (GPUDynInstPtr gpuDynInst, Addr offset)

template<typename T >
void	initDualMemWrite (GPUDynInstPtr gpuDynInst, Addr offset0, Addr offset1)

template<typename T >
void	initAtomicAccess (GPUDynInstPtr gpuDynInst, Addr offset)

void	calcAddr (GPUDynInstPtr gpuDynInst, ConstVecOperandU32 &addr)

Protected Member Functions inherited from gem5::VegaISA::VEGAGPUStaticInst
void	panicUnimplemented () const

Protected Attributes inherited from gem5::VegaISA::Inst_DS
InFmt_DS	instData

InFmt_DS_1	extData

Protected Attributes inherited from gem5::VegaISA::VEGAGPUStaticInst
ScalarRegU32	_srcLiteral
	if the instruction has a src literal - an immediate value that is part of the instruction stream - we store that here

Protected Attributes inherited from gem5::GPUStaticInst
const std::string	_opcode

std::string	disassembly

int	_instNum

int	_instAddr

std::vector< OperandInfo >	srcOps

std::vector< OperandInfo >	dstOps

Detailed Description

Definition at line 33263 of file instructions.hh.

Constructor & Destructor Documentation

◆ Inst_DS__DS_SWIZZLE_B32()

gem5::VegaISA::Inst_DS__DS_SWIZZLE_B32::Inst_DS__DS_SWIZZLE_B32 ( InFmt_DS * iFmt )

While this operation doesn't actually use DS storage we classify it as a load here because it does a writeback to a VGPR, which fits in better with the LDS pipeline logic.

Definition at line 1991 of file ds.cc.

References gem5::GPUStaticInst::setFlag().

◆ ~Inst_DS__DS_SWIZZLE_B32()

gem5::VegaISA::Inst_DS__DS_SWIZZLE_B32::~Inst_DS__DS_SWIZZLE_B32 ( )

Definition at line 2003 of file ds.cc.

Member Function Documentation

◆ execute()

void gem5::VegaISA::Inst_DS__DS_SWIZZLE_B32::execute ( GPUDynInstPtr gpuDynInst )

overridevirtual

The "DS pattern" is comprised of both offset fields. That is, the swizzle pattern between lanes. Bit 15 of the DS pattern dictates which swizzle mode to use. There are two different swizzle patterns: 1) QDMode and 2) Bit-masks mode. If bit 15 is set use QDMode else use Bit-masks mode. The remaining bits dictate how to swizzle the lanes.

QDMode: Chunks the lanes into 4s and swizzles among them. Bits 7:6 dictate where lane 3 (of the current chunk) gets its date, 5:4 lane 2, etc.

Bit-mask: This mode breaks bits 14:0 into 3 equal-sized chunks. 14:10 is the xor_mask, 9:5 is the or_mask, and 4:0 is the and_mask. Each lane is swizzled by performing the appropriate operation using these masks.

This operation allows data sharing between groups of four consecutive threads. Note the increment by 4 in the for loop.

This is needed because we treat this instruction as a load but it's not an actual memory request. Without this, the destination register never gets marked as free, leading to a possible deadlock

Similarly, this counter could build up over time, even across multiple wavefronts, and cause a deadlock.

Implements gem5::GPUStaticInst.

Definition at line 2012 of file ds.cc.

References gem5::bits(), gem5::Wavefront::computeUnit, data, gem5::VegaISA::InFmt_DS_1::DATA0, gem5::Wavefront::decLGKMInstsIssued(), gem5::Wavefront::execUnitId, gem5::VegaISA::Inst_DS::extData, gem5::MipsISA::index, gem5::VegaISA::Inst_DS::instData, gem5::ArmISA::NumVecElemPerVecReg, gem5::VegaISA::InFmt_DS::OFFSET0, gem5::VegaISA::InFmt_DS::OFFSET1, panic_if, gem5::Wavefront::rdLmReqsInPipe, gem5::Wavefront::simdId, gem5::VegaISA::InFmt_DS_1::VDST, gem5::ComputeUnit::vrf, and gem5::VegaISA::VecOperand< DataType, Const, NumDwords >::write().