bool CodeGenWorkItem::ShouldSpeculativelyJitBasedOnProfile() const
{
Js::FunctionBody* functionBody = this->GetFunctionBody();
uint loopPercentage = (functionBody->GetByteCodeInLoopCount()*100) / (functionBody->GetByteCodeCount() + 1);
uint straightLineSize = functionBody->GetByteCodeCount() - functionBody->GetByteCodeInLoopCount();
// This ensures only small and loopy functions are prejitted.
if(loopPercentage >= 50 || straightLineSize < 300)
{
Js::SourceDynamicProfileManager* profileManager = functionBody->GetSourceContextInfo()->sourceDynamicProfileManager;
if(profileManager != nullptr)
{
functionBody->SetIsSpeculativeJitCandidate();
if(!functionBody->HasDynamicProfileInfo())
{
return false;
}
Js::ExecutionFlags executionFlags = profileManager->IsFunctionExecuted(functionBody->GetLocalFunctionId());
if(executionFlags == Js::ExecutionFlags_Executed)
{
return true;
}
}
}
return false;
}
