From: Eli Zaretskii <eliz@gnu.org>
To: Alex Gramiak <agrambot@gmail.com>
Cc: eggert@cs.ucla.edu, emacs-devel@gnu.org
Subject: Re: Using __builtin_expect (likely/unlikely macros)
Date: Tue, 16 Apr 2019 05:34:54 +0300 [thread overview]
Message-ID: <83tveyhe41.fsf@gnu.org> (raw)
In-Reply-To: <87h8aykdod.fsf@gmail.com> (message from Alex Gramiak on Mon, 15 Apr 2019 18:16:02 -0600)
> From: Alex Gramiak <agrambot@gmail.com>
> Date: Mon, 15 Apr 2019 18:16:02 -0600
> Cc: emacs-devel@gnu.org
>
> To human readers, yes, but from what I can tell, GCC is mixed on this.
> When applying the following diff that surrounds emacs_abort in
> bytecode.c and xdisp.c, the assembly in both applied/unapplied is the
> same for bytecode.c, but not for xdisp.c (even without the LIKELY
> cases). I tested using gcc -O2 -S.
I'm not sure whether you put LIKELY and UNLIKELY somewhat randomly,
just for testing, or did you really think each place is
likely/unlikely as in the change, but at least some places in xdisp.c
are wrong: they use LIKELY where UNLIKELY is more appropriate, abd
vice versa.
next prev parent reply other threads:[~2019-04-16 2:34 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 0:15 Using __builtin_expect (likely/unlikely macros) Alex Gramiak
2019-04-15 1:18 ` Paul Eggert
2019-04-15 3:11 ` Alex Gramiak
2019-04-15 4:41 ` Paul Eggert
2019-04-16 0:16 ` Alex Gramiak
2019-04-16 2:34 ` Eli Zaretskii [this message]
2019-04-16 5:33 ` Alex Gramiak
2019-04-16 15:23 ` Eli Zaretskii
2019-04-16 15:47 ` Alex Gramiak
2019-04-16 3:42 ` Paul Eggert
2019-04-16 13:05 ` Stefan Monnier
2019-04-16 15:22 ` Paul Eggert
2019-04-16 16:10 ` Alex Gramiak
2019-04-16 17:54 ` Paul Eggert
2019-04-16 20:50 ` Alex Gramiak
2019-04-16 21:11 ` Alex Gramiak
2019-04-16 21:27 ` Stefan Monnier
2019-04-16 21:27 ` Konstantin Kharlamov
2019-04-18 8:25 ` Paul Eggert
2019-04-18 8:43 ` Konstantin Kharlamov
2019-04-18 13:47 ` Andy Moreton
2019-04-18 17:27 ` Paul Eggert
2019-04-18 17:56 ` Andy Moreton
2019-04-18 19:32 ` Paul Eggert
2019-04-19 13:45 ` Alex Gramiak
2019-04-19 13:58 ` Konstantin Kharlamov
2019-04-19 14:45 ` Alex Gramiak
2019-04-19 17:33 ` Paul Eggert
2019-04-19 20:53 ` Alex Gramiak
2019-04-20 0:05 ` Alan Mackenzie
2019-04-20 0:42 ` Paul Eggert
2019-04-20 19:46 ` Alan Mackenzie
2019-04-20 15:29 ` Andy Moreton
2019-04-20 15:57 ` Paul Eggert
2019-04-20 16:03 ` Eli Zaretskii
2019-04-20 16:11 ` Paul Eggert
2019-04-20 16:18 ` Eli Zaretskii
2019-04-20 16:57 ` Paul Eggert
2019-04-20 17:22 ` Eli Zaretskii
2019-04-20 19:13 ` Paul Eggert
2019-04-20 16:28 ` Óscar Fuentes
2019-04-20 18:58 ` Paul Eggert
2019-04-20 19:35 ` Óscar Fuentes
2019-04-20 22:54 ` Paul Eggert
2020-04-15 3:14 ` John Carter
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