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Showing content from https://clang.llvm.org/doxygen/CodeGenPGO_8cpp.html below:

clang: lib/CodeGen/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/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/MD5.h"
#include <optional>

Go to the source code of this file.

namespace   llvm   Diagnostic wrappers for TextAPI types for error reporting.
  static llvm::cl::opt< bool >  EnableValueProfiling ("enable-value-profiling", llvm::cl::desc("Enable value profiling"), llvm::cl::Hidden, llvm::cl::init(false))   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).
  ◆ DEFINE_NESTABLE_TRAVERSAL #define DEFINE_NESTABLE_TRAVERSAL (   N ) Value:

bool Traverse##N(N *S) { \

Base::Traverse##N(S); \

Hash.combine(PGOHash::EndOfScope); \

return true; \

}

Definition at line 474 of file CodeGenPGO.cpp.

◆ PGOHashVersion

The version of the PGO hash algorithm.

Enumerator PGO_HASH_V1  PGO_HASH_V2  PGO_HASH_V3  PGO_HASH_LATEST 

Definition at line 56 of file CodeGenPGO.cpp.

◆ calculateWeightScale() 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 1444 of file CodeGenPGO.cpp.

◆ EnableValueProfiling() ◆ scaleBranchWeight() 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 1457 of file CodeGenPGO.cpp.

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