Am 18.05.2017 um 16:00 schrieb Ryan Joseph: > >> On May 18, 2017, at 8:53 PM, Michael Van Canneyt <mich...@freepascal.org> >> wrote: >> >> The complaint of Graeme was that a FPC ray tracer is much slower slower than >> an equivalent >> raytracer in Java. All the rest are diversions from the original subject. > > That’s right. I’d really like to know what the hell FPC is doing to make it > so slow (besides the > call to Floor()).
Well, the reason are the linux calling conventions: there are no callee saved xmm registers. This means FPC does not use any single/double register variables. I have some prototype fixes in my local git mirror, but they are neither finished nor tested. > The compiler team should be worried about this also I would think. I am not worried, the code on windows is reasonable good as windows has well designed calling conventions making life for a compiler much easier :) _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
