From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: 11935@debbugs.gnu.org
Subject: bug#11935: XINT etc. should be functions
Date: Sat, 08 Jun 2013 17:52:05 -0700 [thread overview]
Message-ID: <51B3D1B5.8020807@cs.ucla.edu> (raw)
In-Reply-To: <jwvwqq7nqeh.fsf-monnier+emacs@gnu.org>
On 06/06/13 09:42, Stefan Monnier wrote:
> Having XCONS and friends duplicated into a macro version and a function
> version is a non-starter for me.
Yes, I didn't like those macros either. I'll remove them; they're no
longer needed now that GCC has the -Og option. In case you haven't
run into it yet, -Og means "optimize for debugging", and causes GCC to
generate code that's easy to debug, without having the big runtime
performance penalty of -O0.
Like -O2 but unlike -O0, with -Og the CPU time for my little Lisp
nthcdr benchmark is unaffected by the proposed patch (assuming those
macros are removed). C compilation time is considerably faster for
-Og than for -O2; it's not as fast as -O0, but for the common case of
changing one C source file and then typing "make emacs", -Og is faster
than -O0 (because bootstrap-emacs runs faster) and is a tad faster
than -O2 (because the C compiler runs faster).
Here are the detailed times, if you're curious. I got these on a
Fedora 17 x86-64 (AMD Phenom II X4 910e) that was otherwise unloaded.
I used plain 'make' without parallelism. Everything was built with
GCC 4.8.1 and with Texinfo 5.1. All times are user+system CPU times;
the low-order digits of the times aren't that reliable.
(benchmark make \ rm fns.o; rm *.o; make \
100000) xdisp.o make emacs make emacs bootstrap
-O0 unpatched 2.89 3.1 12.4 57 1099
-O0 patched 21.66 3.0 20.0 63 2442
-Og unpatched 1.15 5.9 9.2 80 860
-Og patched 1.15 6.4 9.5 87 879
-O2 unpatched 1.57 11.3 9.6 110 843
-O2 patched 1.57 11.1 9.9 119 847
In (benchmark 100000) the -Og code runs faster than -O2, which is
surprising, but I think it's an anomaly; I may find the time to fire
off a performance bug-report to the GCC developers.
next prev parent reply other threads:[~2013-06-09 0:52 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-13 15:07 bug#11935: XINT etc. should be functions Paul Eggert
2012-07-14 2:20 ` bug#11935: [TRUNCATED MESSAGE 2746 87596] " Richard Stallman
2012-07-15 13:41 ` Paul Eggert
2012-07-15 22:06 ` Stefan Monnier
2012-07-16 14:54 ` Paul Eggert
2012-07-16 16:12 ` Eli Zaretskii
2012-07-16 21:40 ` Paul Eggert
2012-07-16 18:19 ` Richard Stallman
2012-07-16 22:46 ` Paul Eggert
2012-07-17 3:04 ` Eli Zaretskii
2012-07-17 3:54 ` Paul Eggert
2012-07-24 2:20 ` Paul Eggert
2012-07-24 9:07 ` Stefan Monnier
2012-07-24 13:45 ` Paul Eggert
2012-07-24 21:57 ` Stefan Monnier
2012-07-25 4:07 ` Paul Eggert
2012-07-15 14:41 ` Chong Yidong
2012-07-15 16:40 ` Paul Eggert
2012-07-16 2:22 ` Chong Yidong
2012-07-16 14:54 ` Paul Eggert
2013-06-06 15:56 ` Paul Eggert
2013-06-06 16:36 ` Andreas Schwab
2013-06-13 16:30 ` Paul Eggert
2013-06-06 16:42 ` Stefan Monnier
2013-06-09 0:52 ` Paul Eggert [this message]
2013-06-09 3:04 ` Stefan Monnier
2013-06-09 4:37 ` James Cloos
2013-06-09 6:59 ` Jan Djärv
2013-06-09 7:13 ` Paul Eggert
2013-06-09 15:57 ` Stefan Monnier
2013-06-13 14:45 ` Paul Eggert
2013-06-13 20:08 ` Stefan Monnier
2013-06-15 6:43 ` Paul Eggert
2013-06-15 14:22 ` Stefan Monnier
2013-06-17 6:05 ` Paul Eggert
2013-06-09 6:56 ` Jan Djärv
2013-06-09 7:23 ` Paul Eggert
2013-06-09 9:18 ` Jan Djärv
2013-06-09 14:25 ` Juanma Barranquero
2013-06-09 16:05 ` Jan Djärv
2013-06-10 13:40 ` Barry OReilly
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