Faster way to call a method in c++

Question

Quick question and I apologize if it sounds naive. What is faster in c++. A code like this:

ProgramsManager::CurrentProgram->Uniforms->Set(n1);
ProgramsManager::CurrentProgram->Uniforms->Set(n2);
ProgramsManager::CurrentProgram->Uniforms->Set(n3);
ProgramsManager::CurrentProgram->Uniforms->Set(...);

Or this one?

Uniforms* u = ProgramsManager::CurrentProgram->Uniforms;
u->Set(n1);
u->Set(n2);
u->Set(n3);
u->Set(...);

I know the second piece of code is faster in interpreted languages, but I feel like it makes no difference in compiled languages. Am I right? Thank you in advance

Answer 1

The second might be faster, but it won't be faster by a lot.

The reason it might be faster is if the compiler cannot prove to itself that ProgramsManager::CurrentProgram->Uniforms could be changed by the calls to ...->Set. If it can't prove this, it will have to re-evaluate the expression ProgramsManager::CurrentProgram->Uniforms for each line.

However, modern CPUs are usually fairly quick at this kind of thing, and compilers are getting better.