Date: Mon, 23 Mar 2009 14:22:10 -0400 From: Alexander Sack <pisymbol@gmail.com> To: Alexander Sack <pisymbol@gmail.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Long double support in FreeBSD? Message-ID: <3c0b01820903231122mb763be4geb07cafecc80db1b@mail.gmail.com> In-Reply-To: <20090323180327.GA8943@zim.MIT.EDU> References: <3c0b01820903230930q1b54f9a5p38f4d6d230a350c7@mail.gmail.com> <20090323180327.GA8943@zim.MIT.EDU>
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On Mon, Mar 23, 2009 at 2:03 PM, David Schultz <das@freebsd.org> wrote: > On Mon, Mar 23, 2009, Alexander Sack wrote: >> I'm working with building the Boost libraries and Boost.Math has long >> double support stubbed out for FreeBSD (personally I don't need it >> but..). =A0I believe looking at some historical threads about this over >> the weekend and a lot of it was due to compiler GNUish bugs handling >> long double math (I believe Bruce Evans had some patches at one point >> but mentioned it was still crappy). >> >> Can someone speak if the current compiler/BSD flavors support long >> double math on a 64-bit capable CPU (LM=3D1)? > > Long doubles are supported, except that long double versions of > the following libm functions are missing: > > =A0 =A0acoshl asinhl atanhl cbrtl coshl erfcl erfl expl expm1l > =A0 =A0lgammal log10l log1pl log2l logl powl sinhl tanhl tgammal > > The only other caveat is that on i386 we set the FPU to 53-bit > precision so that gcc produces saner results in double precision. > (See the archives for the gruesome details.) Of course, if you're > running FreeBSD/amd64 on a 64-bit machine, this doesn't apply. > Thank you so much David, that is what I needed to know (I just thought asking would be easier in this case than trying to parse through the many threads over the past about this topic). -aps
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