Why is CharInSet faster than Case statement?

Question

I\'m perplexed. At CodeRage today, Marco Cantu said that CharInSet was slow and I should try a Case statement instead. I did so in my parser and then checked with AQTime wha

Answer 1

A free sampling profiler for Delphi can be found there:

https://forums.codegear.com/thread.jspa?messageID=18506

Apart from the issue of incorrect time measurement of instrumenting profilers, it should be noted that which is faster will also depend on how predictable the "case" branches are. If the tests in the "case" have all a similar probability of being encountered, performance of "case" can end up lower than that of CharInSet.