This is an extension to the question : Can __attribute__((packed)) affect the performance of a program? (In this question answers seems to give a general answer on performance)
My Case : I intend to use "attribute((packed))" use C(C++)-structs on rarely executed code.
My question is, is aforementioned(in above Answered question) Performance degradation present ONLY for instructions involving "packed" structs ? or is it present for code that does NOT use "packed" structs too ?
e.g.
struct __attribute__((packed)) Abc {int y = 0;...};
void rarelyCalledFunction() { uses above Abc struct. Abc is NOT used in any other function }
//other functions exists F1, F2, F3, ... etc
Say "rarelyCalledFunction" is called only on start-up and only once per every 4 hrs (assume program runs for 24 hrs). Does performance of functions F1, F2, F3 etc degrade too ?
