Should have written "I found that using log2 directly on my computer was slower than using log with the divide".
> On 06/06/2026 4:06 PM PDT KENNON J CONRAD via Cygwin <[email protected]> > wrote: > > > Hello Carlo B., > > There was another discussion of this issue back in January. Beware, at the > time I found that > using log2 directly on my computer was slower than using log2 with the divide > (by removing the > same lines you mention in math.h). It seems to me that in a perfect world, > using log2 should > be both more accurate and faster than calling log and dividing the result by > a constant. > > Best Regards, > > Kennon Conrad > > https://cygwin.com/pipermail/cygwin/2026-January/259314.html > > > On 06/06/2026 9:53 AM PDT Carlo B. via Cygwin <[email protected]> wrote: > > > > > > Hello, > > > > Il Sab 6 Giu 2026, 14:19 Dimitry Andric <[email protected]> ha > > scritto: > > > > > > > > It's been defined like that since the "import newlib-2000-02-17 snapshot", > > > so for 26 years: > > > > > > > > > https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/include/math.h;h=d3f2e99ae4d33596b608225f0349a6d581d265ca;hb=8a0efa53e44919bcf5ccb1d3353618a82afdf8bc#l103 > > > > > > My guess is that at the time, there wasn't yet a separate log2() > > > implementation, so this was an easy way to cover that case. > > > > > > > Thank you very much for the reply. > > So, do you think that it would be possible to remove those lines from > > math.h and use the log2() now provided? > > > > Sincerely, > > > > Carlo Bramini > > > > > > > -Dimitry > > > > > > > > > > -- > > Problem reports: https://cygwin.com/problems.html > > FAQ: https://cygwin.com/faq/ > > Documentation: https://cygwin.com/docs.html > > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple > > -- > Problem reports: https://cygwin.com/problems.html > FAQ: https://cygwin.com/faq/ > Documentation: https://cygwin.com/docs.html > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
