From: "Stéphane Glondu" <stephane.glondu@inria.fr>
To: Alexander Monakov <amonakov@ispras.ru>, gcc-help@gcc.gnu.org
Cc: sibid@uvic.ca, Paul Zimmermann <Paul.Zimmermann@inria.fr>
Subject: Re: slowdown with -std=gnu18 with respect to -std=c99
Date: Thu, 5 May 2022 16:31:48 +0200 [thread overview]
Message-ID: <c1a686bd-d2fa-a934-f931-6bf96f11e3d9@inria.fr> (raw)
In-Reply-To: <c8517377-e695-06fe-0be4-b7e409d471b9@inria.fr>
As additional data points, the performance with several versions of gcc
(as packaged in Debian testing/unstable):
| gcc-9 | gcc-10 | gcc-11 | gcc-12 |
------------|-------|--------|--------|--------|
-std=c99 | 24 | 23.5 | 23 | 23 |
-std=gnu18 | 43 | 16.8 | 38 | 38 |
One can see that the performance stays relatively constant with
-std=c99, but varies significantly with -std=gnu18.
--
Stéphane
next prev parent reply other threads:[~2022-05-05 14:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 8:28 Paul Zimmermann
2022-05-03 9:09 ` Alexander Monakov
2022-05-03 11:45 ` Paul Zimmermann
2022-05-03 12:12 ` Alexander Monakov
2022-05-05 8:57 ` Stéphane Glondu
2022-05-05 14:31 ` Stéphane Glondu [this message]
2022-05-05 14:41 ` Marc Glisse
2022-05-05 14:56 ` Alexander Monakov
2022-05-06 7:46 ` Paul Zimmermann
2022-05-06 9:27 ` Alexander Monakov
2022-05-07 6:11 ` Paul Zimmermann
2022-05-11 13:26 ` Alexander Monakov
2022-05-05 17:50 ` Paul Zimmermann
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