From: Dmitry Antipov <dmantipov@yandex.ru>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: Paul Eggert <eggert@cs.ucla.edu>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings]
Date: Thu, 04 Sep 2014 17:37:30 +0400 [thread overview]
Message-ID: <54086B1A.8070506@yandex.ru> (raw)
In-Reply-To: <jwvwq9jwmxd.fsf-monnier+emacs@gnu.org>
On 09/04/2014 05:11 PM, Stefan Monnier wrote:
> Let's not worry about this case, we can/should punt to Fcons for them.
Thanks to Paul, there is a C99-compilant solution:
#if (__GNUC__ || __HP_cc || __HP_aCC || __IBMC__ \
|| __IBMCPP__ || __ICC || 0x5110 <= __SUNPRO_C)
/* have __attribute__ ((aligned (GCALIGNMENT))) for conses */
#define scoped_cons(car, cdr) \
make_lisp_ptr (&((struct Lisp_Cons) { car, { cdr } }), Lisp_Cons)
#else /* another compiler, need an explicit alignment */
INLINE Lisp_Object
scoped_cons_init (void *ptr, Lisp_Object x, Lisp_Object y)
{
struct Lisp_Cons *c = (struct Lisp_Cons *)
(((uintptr_t) ptr + (GCALIGNMENT - 1)) & ~(GCALIGNMENT - 1));
c->car = x;
c->u.cdr = y;
return make_lisp_ptr (c, Lisp_Cons);
}
#define scoped_cons(car, cdr) \
scoped_cons_init ((char[sizeof (struct Lisp_Cons) \
+ (GCALIGNMENT - 1)]) {}, (car), (cdr))
#endif /* compiler selection */
next prev parent reply other threads:[~2014-09-04 13:37 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-02 12:55 [RFC] temporary Lisp_Strings Dmitry Antipov
2014-09-02 13:21 ` Andreas Schwab
2014-09-02 13:47 ` Dmitry Antipov
2014-09-02 14:14 ` Andreas Schwab
2014-09-02 15:00 ` Eli Zaretskii
2014-09-02 14:00 ` Stefan Monnier
2014-09-02 15:13 ` Dmitry Antipov
2014-09-02 17:32 ` Stefan Monnier
2014-09-03 10:23 ` Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings] Dmitry Antipov
2014-09-03 13:14 ` Stefan Monnier
2014-09-03 14:39 ` Paul Eggert
2014-09-03 15:39 ` Dmitry Antipov
2014-09-03 16:42 ` Paul Eggert
2014-09-03 17:47 ` Stefan Monnier
2014-09-03 18:00 ` Paul Eggert
2014-09-04 4:59 ` Dmitry Antipov
2014-09-04 5:13 ` Paul Eggert
2014-09-04 5:51 ` Dmitry Antipov
2014-09-04 6:45 ` Paul Eggert
2014-09-04 13:11 ` Stefan Monnier
2014-09-04 13:37 ` Dmitry Antipov [this message]
2014-09-04 14:46 ` Dmitry Antipov
2014-09-04 16:03 ` Paul Eggert
2014-09-05 4:00 ` Dmitry Antipov
2014-09-05 4:24 ` Stefan Monnier
2014-09-05 9:28 ` Dmitry Antipov
2014-09-05 7:15 ` Paul Eggert
2014-09-05 9:16 ` Dmitry Antipov
2014-09-05 14:35 ` Paul Eggert
2014-09-05 15:35 ` Stefan Monnier
2014-09-08 10:33 ` Dmitry Antipov
2014-09-08 12:01 ` Dmitry Antipov
2014-09-08 13:30 ` Stefan Monnier
2014-09-08 12:44 ` Stefan Monnier
2014-09-08 13:30 ` Stefan Monnier
2014-09-02 14:37 ` [RFC] temporary Lisp_Strings Paul Eggert
2014-09-02 15:24 ` Dmitry Antipov
2014-09-02 15:28 ` Dmitry Antipov
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