From: Marius Vollmer <mvo@zagadka.ping.de>
Cc: Gary Houston <ghouston@arglist.com>, guile-devel@gnu.org
Subject: Re: gcc optimisation breaks guile floating point
Date: 28 Aug 2002 22:26:12 +0200 [thread overview]
Message-ID: <8765xuzq57.fsf@zagadka.ping.de> (raw)
In-Reply-To: <15723.64888.759743.439428@blauw.xs4all.nl>
Han-Wen Nienhuys <hanwen@cs.uu.nl> writes:
> I think that these double (as in twice) initializations are weird, and
> should go. Why not
>
> scm_t_double bla;
> bla.tag = scm_double_tag
> bla.pad = 0x0
> bla.double = z;
> return scm_double_cell (
> ((scm_t_double_cell*) &bla) -> car,
> ((scm_t_double_cell*) &bla) -> cbr,
> ((scm_t_double_cell*) &bla) -> ccr,
> ((scm_t_double_cell*) &bla) -> cdr);
This looks wierd as well, don't you think?
> Another option
>
> *((unsigned long *) z) = 0;
> scm_remember ((SCM) z);
> *((double *) z) = x;
> return z;
I like this better (with a suitable comment of course).
I guess that the funny aliasing behaviour applies only to pointers to
floating point types, right?
--
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3 331E FAF8 226A D5D4 E405
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next prev parent reply other threads:[~2002-08-28 20:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-27 21:10 gcc optimisation breaks guile floating point Gary Houston
2002-08-27 22:30 ` Han-Wen Nienhuys
2002-08-28 20:26 ` Marius Vollmer [this message]
2002-08-28 22:53 ` Han-Wen Nienhuys
2002-08-30 17:44 ` Gary Houston
2002-09-05 21:10 ` Han-Wen Nienhuys
2002-09-12 1:46 ` Carl R. Witty
2002-09-13 21:20 ` Han-Wen Nienhuys
2002-09-24 22:32 ` Gary Houston
[not found] ` <200209242233.PAA04201@onyx.he.net>
2002-10-02 22:40 ` Marius Vollmer
2002-10-02 23:34 ` Gary Houston
[not found] ` <200210022336.QAA18265@onyx.he.net>
2002-10-03 12:33 ` Marius Vollmer
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