Question

Is there an efficiency preference for one of the following control flow options for use in a loop or switch over the other?

Option 1:

switch(...){
    case 1:
        if (...) { ... }
        else if (...) { ... }
        else if (...) { ... }
        .
        .
        .
        else if (...) { ... }
        break;
    case 2:
    .
    .
    .
}

Option 2:

switch(...){
    case 1:
        if (...) { ... break; }
        if (...) { ... break; }
        .
        .
        .
        if (...) { ... break; }
    case 2:
    .
    .
    .
}

Answer 1

No. Any sane compiler will generate to the same output (assembly, bytecode, etc). for both.

You can demonstrate this using gcc -S to generate assembly for both versions.