On 2011-05-13 11:38:22 +0200, Axel Freyn wrote: > Hi Vincent, > On Fri, May 13, 2011 at 11:29:46AM +0200, Vincent Lefevre wrote: > > https://www-304.ibm.com/support/docview.wss?rs=2030&uid=swg21245006 > > says: > > > > GCC versions 4.0 and higher support 128-bit quad precision > > floating point values. The XL compilers now provide the > > -qfloat=gcclongdouble option to be compatible with GCC's > > representation of 128-bit quad precision floating point > > values. > > > > Anyone knows how to enable it? > > > > By default, I just get the double-double representation (yielding > > 106-bit precision). > the gcc online-docs say > http://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html > "Not all targets support additional floating point types. __float80 and > __float128 types are supported on i386, x86_64 and ia64 targets." > (but I never tried it on PowerPC) Still, __float128 isn't a long double as said in the note above. I now wonder whether the note is correct. -- Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)
