CodeGenPGO.cpp File Reference

#include "CodeGenPGO.h"
#include "CodeGenFunction.h"
#include "CoverageMappingGen.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/StmtVisitor.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/ProfileData/InstrProfReader.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MD5.h"

Include dependency graph for CodeGenPGO.cpp:

Go to the source code of this file.

Functions
static llvm::Function *	getRegisterFunc (CodeGenModule &CGM)
static llvm::BasicBlock *	getOrInsertRegisterBB (CodeGenModule &CGM)
static llvm::Constant *	getOrInsertRuntimeRegister (CodeGenModule &CGM)
static bool	isMachO (const CodeGenModule &CGM)
static StringRef	getCountersSection (const CodeGenModule &CGM)
static StringRef	getNameSection (const CodeGenModule &CGM)
static StringRef	getDataSection (const CodeGenModule &CGM)
static void	emitRuntimeHook (CodeGenModule &CGM)
static uint64_t	calculateWeightScale (uint64_t MaxWeight)
	Calculate what to divide by to scale weights.
static uint32_t	scaleBranchWeight (uint64_t Weight, uint64_t Scale)
	Scale an individual branch weight (and add 1).

---

Function Documentation

static uint64_t calculateWeightScale

(

uint64_t

MaxWeight

)

[static]

Calculate what to divide by to scale weights.

Given the maximum weight, calculate a divisor that will scale all the weights to strictly less than UINT32_MAX.

Definition at line 1019 of file CodeGenPGO.cpp.

Referenced by clang::CodeGen::CodeGenPGO::createBranchWeights().

static void emitRuntimeHook

(

CodeGenModule &

CGM

)

[static]

Definition at line 815 of file CodeGenPGO.cpp.

References clang::CodeGen::CodeGenModule::addUsedGlobal(), Builder, clang::ExternalLinkage, clang::CodeGen::CodeGenModule::getCodeGenOpts(), clang::CodeGen::CodeGenModule::getLLVMContext(), and clang::CodeGen::CodeGenModule::getModule().

Referenced by clang::CodeGen::CodeGenPGO::assignRegionCounters().

static StringRef getCountersSection

(

const CodeGenModule &

CGM

)

[static]

Definition at line 118 of file CodeGenPGO.cpp.

References isMachO().

static StringRef getDataSection

(

const CodeGenModule &

CGM

)

[static]

Definition at line 126 of file CodeGenPGO.cpp.

References isMachO().

static StringRef getNameSection

(

const CodeGenModule &

CGM

)

[static]

Definition at line 122 of file CodeGenPGO.cpp.

References isMachO().

static llvm::BasicBlock* getOrInsertRegisterBB

(

CodeGenModule &

CGM

)

[static]

Definition at line 79 of file CodeGenPGO.cpp.

References Builder, clang::CodeGen::CodeGenModule::getCodeGenOpts(), clang::CodeGen::CodeGenModule::getLLVMContext(), clang::CodeGen::CodeGenModule::getModule(), getRegisterFunc(), clang::CodeGen::CodeGenModule::getTarget(), clang::TargetInfo::getTriple(), and clang::InternalLinkage.

Referenced by clang::CodeGen::CodeGenPGO::emitInstrumentationData().

static llvm::Constant* getOrInsertRuntimeRegister

(

CodeGenModule &

CGM

)

[static]

Definition at line 106 of file CodeGenPGO.cpp.

References clang::CodeGen::CodeGenModule::getLLVMContext(), and clang::CodeGen::CodeGenModule::getModule().

Referenced by clang::CodeGen::CodeGenPGO::emitInstrumentationData().

static llvm::Function* getRegisterFunc

(

CodeGenModule &

CGM

)

[static]

Definition at line 75 of file CodeGenPGO.cpp.

References clang::CodeGen::CodeGenModule::getModule().

Referenced by clang::CodeGen::CodeGenPGO::emitInitialization(), and getOrInsertRegisterBB().

static bool isMachO

(

const CodeGenModule &

CGM

)

[static]

Definition at line 114 of file CodeGenPGO.cpp.

References clang::CodeGen::CodeGenModule::getTarget(), and clang::TargetInfo::getTriple().

Referenced by getCountersSection(), getDataSection(), and getNameSection().

static uint32_t scaleBranchWeight	(	uint64_t	Weight,
		uint64_t	Scale
	)		[static]

Scale an individual branch weight (and add 1).

Scale a 64-bit weight down to 32-bits using Scale.

According to Laplace's Rule of Succession, it is better to compute the weight based on the count plus 1, so universally add 1 to the value.

Precondition:

Scale was calculated by calculateWeightScale() with a weight no greater than Weight.

Definition at line 1032 of file CodeGenPGO.cpp.

Referenced by clang::CodeGen::CodeGenPGO::createBranchWeights().