On Sun, Aug 23, 2009 at 07:42, Tom Lane<t...@sss.pgh.pa.us> wrote: > Greg Stark <gsst...@mit.edu> writes: >> If there's a performance advantage then we could add a configure test >> and define the macro to call hypot(). You said it existed before C99 >> though, how widespread was it? If it's in all the platforms we support >> it might be reasonable to just go with it. > > For one data point, I see hypot() in HPUX 10.20, released circa 1996. > I suspect we would want a configure test and a substitute function > anyway. Personally I wouldn't have a problem with the substitute being > the naive sqrt(x*x+y*y), particularly if it's replacing existing code > that overflows in the same places.
For another data point, Microsoft documentation says: "This POSIX function is deprecated beginning in Visual C++ 2005. Use the ISO C++ conformant _hypot instead." _hypot() has been there since Windows 95, so it shouldn't be a problem to use it - it just needs a define, like we have for some other such functions. -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
