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Re: Irix6 long doubles implemented wrong? (27_io/ostream_inserter_arith)
- From: Alexandre Oliva <aoliva at redhat dot com>
- To: Richard Henderson <rth at redhat dot com>
- Cc: "Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>, gcc-bugs at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org, gcc at gcc dot gnu dot org, libstdc++ at gcc dot gnu dot org, oldham at codesourcery dot com, ro at TechFak dot Uni-Bielefeld dot DE
- Date: 09 Jan 2003 21:53:55 -0200
- Subject: Re: Irix6 long doubles implemented wrong? (27_io/ostream_inserter_arith)
- Organization: GCC Team, Red Hat
- References: <200212142145.QAA25890@caip.rutgers.edu><or8yypualb.fsf@free.redhat.lsd.ic.unicamp.br><200212170531.AAA15561@caip.rutgers.edu><or4r97diei.fsf@free.redhat.lsd.ic.unicamp.br><orisxmn2fv.fsf@free.redhat.lsd.ic.unicamp.br><oradiw3e9k.fsf@free.redhat.lsd.ic.unicamp.br><200212241434.JAA22361@caip.rutgers.edu><orhed32l12.fsf@free.redhat.lsd.ic.unicamp.br><orwulx34wh.fsf@free.redhat.lsd.ic.unicamp.br><orptrn4lr0.fsf@free.redhat.lsd.ic.unicamp.br><20030107221549.GR12992@redhat.com>
On Jan 7, 2003, Richard Henderson <rth@redhat.com> wrote:
>> * real.h (struct real_format): Add denorm_p, remove has_denorm.
>> * real.c: Adjust all formats and references to has_denorm.
>> * c-common.c (builtin_define_float_constants): Use denorm_p to
>> define DENORM_MIN.
> This one's sticky. Strictly speaking, the double-double format
> isn't LIA-1 compliant (too few denormal bits), and so libstdc++
> ought to be setting denorm_min to zero. On the other hand, I
> can see that this value might still be useful for some people.
> Run it by the libstdc++ language lawyers.
I've just gone through the C++ Standard's numeric_limits definitions
and the C99's float.h specification, and I couldn't find any reason
to not use the definitions the way I've introduced them. The fact
that they get the libstdc++-v3 testsuite to pass in cases it didn't
before seems to be a good indication that it is good enough.
Ok to check it all in?
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist Professional serial bug killer