[timmisiak]

Yes, saving and restoring flags is very expensive. I thought about talking about that in the article but figured that was too much of a detour.

Darek Mihocka wrote a really interesting article about how to optimize flag calculations in an x86 emulator:

http://emulators.com/docs/nx11_flags.htm

Although looking at your username I suspect you may have read this one before...

[mark_undoio]

I had not read it before! Thanks for the link. I don't get too involved with our JIT other than to occasionally peer into some code and go "ooooh"