On 13 May 2011 11:20, Vincent Lefevre wrote: > 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. Use --with-long-double-128 at configure time. See gcc/configure case "$target" in powerpc*-*-linux* | \ powerpc*-*-gnu* | \ sparc*-*-linux* | \ s390*-*-linux* | \ alpha*-*-linux*)
