On Tuesday 17 December 2013 20:24:27 Sieghard wrote: > > BUT: Does anybody _really_ think that type casting _does_ something? > > A type cast, CPU wise, is a no-op, quite simply.
Correct, if the sizes of the types are the same a type conversion says to the compiler "I know what I do". For the conversion from smaller to bigger it either - sign extends the value if the conversion is signed to signed: " int32var:= int32(int16value); " - it fills the upper bytes with 0 if the smaller or the bigger is unsigned: " card32var:= card32(card16value); card32var:= card32(int16value); //possible range check? int32var:= int32(card16value); " If the conversion is from bigger to smaller it truncates to the lower bytes with a possible range check. " card16var:= card16(card32value); card16var:= card16(int32value); int16var:= int16(card32value); int16var:= int16(int32value); " Martin ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
