LLVM  13.0.0git
Macros | Functions | Variables
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 "AMDGPU.h"
#include "AMDGPUPerfHintAnalysis.h"
#include "Utils/AMDGPUBaseInfo.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CallGraph.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/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"
Include dependency graph for AMDGPUPerfHintAnalysis.cpp:

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 (AMDGPUPerfHintAnalysis, DEBUG_TYPE, "Analysis if a function is memory bound", true, true) namespace
 

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 31 of file AMDGPUPerfHintAnalysis.cpp.

Function Documentation

◆ INITIALIZE_PASS()

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

◆ 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"))
static

Referenced by INITIALIZE_PASS().

◆ LargeStrideThresh

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

Referenced by INITIALIZE_PASS().

◆ LimitWaveThresh

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

Referenced by INITIALIZE_PASS().

◆ LSWeight

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

Referenced by INITIALIZE_PASS().

◆ MemBoundThresh

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

Referenced by INITIALIZE_PASS().