AMDGPUPerfHintAnalysis.cpp File Reference

Analyzes if a function potentially memory bound and if a kernel kernel may benefit from limiting number of waves to reduce cache thrashing. More...

#include "AMDGPUPerfHintAnalysis.h"
#include "AMDGPU.h"
#include "AMDGPUTargetMachine.h"
#include "Utils/AMDGPUBaseInfo.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CallGraphSCCPass.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "amdgpu-perf-hint"

Functions
	STATISTIC (NumMemBound, "Number of functions marked as memory bound")
	STATISTIC (NumLimitWave, "Number of functions marked as needing limit wave")
	INITIALIZE_PASS (AMDGPUPerfHintAnalysisLegacy, DEBUG_TYPE, "Analysis if a function is memory bound", true, true) bool AMDGPUPerfHintAnalysisLegacy

Variables
static cl::opt< unsigned >	MemBoundThresh ("amdgpu-membound-threshold", cl::init(50), cl::Hidden, cl::desc("Function mem bound threshold in %"))
static cl::opt< unsigned >	LimitWaveThresh ("amdgpu-limit-wave-threshold", cl::init(50), cl::Hidden, cl::desc("Kernel limit wave threshold in %"))
static cl::opt< unsigned >	IAWeight ("amdgpu-indirect-access-weight", cl::init(1000), cl::Hidden, cl::desc("Indirect access memory instruction weight"))
static cl::opt< unsigned >	LSWeight ("amdgpu-large-stride-weight", cl::init(1000), cl::Hidden, cl::desc("Large stride memory access weight"))
static cl::opt< unsigned >	LargeStrideThresh ("amdgpu-large-stride-threshold", cl::init(64), cl::Hidden, cl::desc("Large stride memory access threshold"))

Detailed Description

Analyzes if a function potentially memory bound and if a kernel kernel may benefit from limiting number of waves to reduce cache thrashing.

Definition in file AMDGPUPerfHintAnalysis.cpp.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "amdgpu-perf-hint"

Definition at line 35 of file AMDGPUPerfHintAnalysis.cpp.

Function Documentation

INITIALIZE_PASS()

INITIALIZE_PASS	(	AMDGPUPerfHintAnalysisLegacy	,
		DEBUG_TYPE	,
		"Analysis if a function is memory bound"	,
		true	,
		true
	)

Definition at line 470 of file AMDGPUPerfHintAnalysis.cpp.

STATISTIC() [1/2]

STATISTIC	(	NumLimitWave	,
		"Number of functions marked as needing limit wave"
	)

STATISTIC() [2/2]

STATISTIC	(	NumMemBound	,
		"Number of functions marked as memory bound"
	)

Variable Documentation

IAWeight

cl::opt< unsigned > IAWeight("amdgpu-indirect-access-weight", cl::init(1000), cl::Hidden, cl::desc("Indirect access memory instruction weight")) ( "amdgpu-indirect-access-weight"  , cl::init(1000)  , cl::Hidden  , cl::desc("Indirect access memory instruction weight")    )

static

LargeStrideThresh

cl::opt< unsigned > LargeStrideThresh("amdgpu-large-stride-threshold", cl::init(64), cl::Hidden, cl::desc("Large stride memory access threshold")) ( "amdgpu-large-stride-threshold"  , cl::init(64)  , cl::Hidden  , cl::desc("Large stride memory access threshold")    )

static

LimitWaveThresh

cl::opt< unsigned > LimitWaveThresh("amdgpu-limit-wave-threshold", cl::init(50), cl::Hidden, cl::desc("Kernel limit wave threshold in %")) ( "amdgpu-limit-wave-threshold"  , cl::init(50)  , cl::Hidden  , cl::desc("Kernel limit wave threshold in %")    )

static

LSWeight

cl::opt< unsigned > LSWeight("amdgpu-large-stride-weight", cl::init(1000), cl::Hidden, cl::desc("Large stride memory access weight")) ( "amdgpu-large-stride-weight"  , cl::init(1000)  , cl::Hidden  , cl::desc("Large stride memory access weight")    )

static

MemBoundThresh

cl::opt< unsigned > MemBoundThresh("amdgpu-membound-threshold", cl::init(50), cl::Hidden, cl::desc("Function mem bound threshold in %")) ( "amdgpu-membound-threshold"  , cl::init(50)  , cl::Hidden  , cl::desc("Function mem bound threshold in %")    )

static