On Wed, Sep 5, 2012 at 1:29 AM, Irek Szczesniak <iszczesn...@gmail.com> wrote: > On Wed, Sep 5, 2012 at 12:16 AM, Roland Mainz <roland.ma...@nrubsig.org> > wrote: >> Hi! >> >> ---- >> >> Mostly offtopic for this list: >> TheRegister.co.uk has a small article about the ne SPARC64-X processor >> - see http://www.theregister.co.uk/2012/09/04/fujitsu_sparc64_x_processor/ >> >> Noteable (for us) feature is the Decfloat accelerator... which is IMHO >> an indicator that Decimal floating point has become more important >> (remember the old proposal for typeset -D and typeset -lD to define >> |decimal64| and |decimal128| datatypes (agghllrr... does anyone >> remember which printf format letters are reserved for DecFloat ?)) > > The 'reserved' letters in printf formats for decimal floating point > are %D and %H, it will be used to represent decimal floating point > formats in the future (i.e. the decimal floating point length > modifiers for printf and scanf floating point conversion specifiers > (a, A, e, E, f, F, g, G) are DF for _Decimal32, DD for _Decimal64, and > DL for _Decimal128). > > References: > - http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1312.pdf > - > http://www.opensource.apple.com/source/gcc/gcc-5659/gcc/testsuite/gcc.dg/format/dfp-printf-1.c > > For those who think decimal floating point support is far away: AIX > and HP-UX already support decimal floating point in libc and one major > x86 vendor is going to add hardware support in its next generation of > CPUs. No surprises here. But seeing this in Fujitsu SPARC64 was even a > surprise for me since Fujitsu is very conservative in adding new ABI > related features. If they add it then it must have become very > important.
BTW: Here is the link to the ISO C DecFP technical report: http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1312.pdf These two links describe how libdfp works... this may be interesting for a matching libast implementation of the same stuff: http://www.eglibc.org/cgi-bin/viewvc.cgi/libdfp/trunk/README.developer?view=co http://www.eglibc.org/cgi-bin/viewvc.cgi/libdfp/trunk/README.user?view=co ---- Bye, Roland -- __ . . __ (o.\ \/ /.o) roland.ma...@nrubsig.org \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer /O /==\ O\ TEL +49 641 3992797 (;O/ \/ \O;) _______________________________________________ ast-developers mailing list ast-developers@research.att.com https://mailman.research.att.com/mailman/listinfo/ast-developers
