-------- Original-Nachricht -------- > Datum: Mon, 04 Jul 2011 20:53:00 +0200 > Von: Georg-Johann Lay <avr@xxxxxxxx> > An: paul@xxxxxxxxxxxxxxxxx > CC: Andrew Haley <aph@xxxxxxxxxx>, gcc-help@xxxxxxxxxxx > Betreff: Re: Question on strict aliasing in C. > Paul Smith wrote: > > On Mon, 2011-07-04 at 19:17 +0200, Georg-Johann Lay wrote: > >>>> double copysign (double x, double y) > >>>> { > >>>> unsigned short * const px = (unsigned short*)(char*)&x + 3; > >>>> unsigned short * const py = (unsigned short*)(char*)&y + 3; > > > > I don't get why you have the (char*) cast here? > > It's not a source of mine. I don't know the reason why it's there. > I think it's a very simple reason: The author knew about strict aliasing, and new that "char*"-pointers are somehow special -- so he added char* in an (useless) attempt to correct it ;-) Axel -- NEU: FreePhone - kostenlos mobil telefonieren! Jetzt informieren: http://www.gmx.net/de/go/freephone