As I undestand, sage uses custom int среда, 15 января 2020 г., 12:22:51 UTC+3 пользователь Dima Pasechnik написал: > > On Tue, Jan 14, 2020 at 10:23 PM Nils Bruin <nbr...@sfu.ca <javascript:>> > wrote: > > > > On Tuesday, January 14, 2020 at 5:36:27 AM UTC-8, Александр Ватузов > wrote: > >> > >> Now I constantly know, that problem was in using > >> > >> divmod(n, base**half) > >> > >> instead of > >> > >> n // (base**half), n % (base**half) > > > > > > The second option yields a performance regression relative to the first, > because you would end up doing an integer division twice rather than one > (integer division yields both the quotient and the remainder, so throwing > one away and then recomputing it to find it anyway is wasteful). You're > also performing an exponentiation twice. > > > > I think it would be better to find/write a "divmod" that works in py3 as > well. > > > it is a Sage-specfic bug, as simply installing mpmath into system > Python3 fails to reproduce the issue. > (or perhaps it's due to Cython, or a specific version of it) > Does Sage use a "custom" divmod in mpmath code? > > > > > -- > > You received this message because you are subscribed to the Google > Groups "sage-support" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to sage-s...@googlegroups.com <javascript:>. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-support/78a83c70-0f12-4df0-a2e4-d4a499b388bf%40googlegroups.com. > > >
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