Author: Bo Persson
Date: 10:45:16 01/14/02
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On January 13, 2002 at 16:28:32, David Rasmussen wrote: >On January 13, 2002 at 15:19:18, Severi Salminen wrote: > >>>think. That would be really cool. MSVC++ have such an extension, sort of. But I >>>don't know if it works well or not. I haven >>>t tried using it. >> >>What extension? >> >>Severi > >An invariant or postcondition compiler directive. I can't remember it's name, >but I found it once, in the help files. Maybe Dann knows. One is able to write >something like "__inavariant__ (square >= 0 && square <= 63) or something like >that. > >/David It is called __assume( ) and is supposed to give hints to the compiler. I haven't found much use for it though, possibly because the documentation is not at all clear about exactly what is does. The only example is using it in a switch statement, where a switch(x) { ... default: __assume(0) } would indicate that the default case is never taken, so the compiler can remove its range check. Saves several instructions... Bo Persson bop2@telia.com
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