>Hm, but conditional execution of SWIs isn't possible with this system.
>The extra branch would affect both performance and code density.

Well, in practice SWIs are almost never conditional anyway - you normally 
decide whether or not you are going to do the syscall before you start 
marshalling arguments and so on.  The only exception that comes to mind is 
breakpoints; offhand I can't think of an efficient way to make them work.

p.



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