On Tue, May 5, 2009 at 8:06 PM, Jean-Marc Eber <jeanmarc.e...@lexifi.com> wrote: > Hi Dimitry, > > Firstly thanks for looking again at the sse2 stuff! > > A difference may occur, if I'm not wrong, from the intermediate results > precision: > > in sse2, eveything is done on 8 bytes (if you "do" doubles at least), while, > in x87, intermdiate results (kept on the stack) are 10 bytes precision. > > This may result in differences (and the bytecode runtime never uses x87 > intermediate storage, so it behaves _numerically_ like the sse2 code > generator, I guess).
I wouldn't be so sure. Bytecode runtime is C compiler-dependent (that does use x87 for floating-point calculations), so rounding errors can lead to different results. Floating point is always approximate... - Dmitry Bely _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
