On Sam, 2012-08-11 at 10:30 -0700, Steven Fuerst wrote: > We use __fls() to find the most significant bit. Using that, the > loop can be avoided. A second trick is to use the behaviour of the > rotate instructions to expand the range of the unsigned int to float > conversion to the full 32 bits in a branchless way. > > The routine is now exact up to 2^24. Above that, we truncate which > is equivalent to rounding towards zero. > > Signed-off-by: Steven Fuerst <svfuerst@xxxxxxxxx> It might be better to reorder the series to use a shared int2float first and then optimize that. Either way though, although I haven't really looked into the floating point encoding aspects, the series is Reviewed-by: Michel Dänzer <michel.daenzer@xxxxxxx> -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
