From: Segher Boessenkool <segher@kernel.crashing.org>
To: Andrew MacLeod <amacleod@redhat.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] Add divide by zero side effect.
Date: Wed, 18 May 2022 13:13:48 -0500 [thread overview]
Message-ID: <20220518181348.GC25951@gate.crashing.org> (raw)
In-Reply-To: <c511febf-7a4d-1754-1893-ac77602a18d5@redhat.com>
On Tue, May 17, 2022 at 02:39:11PM -0400, Andrew MacLeod via Gcc-patches wrote:
> I haven't checked this patch in yet. This implements a side effect that
> the divisor cannot be 0 after a divide executes. This allows us to fold
> the divide away:
"Side effect" already has a meaning, very commonly used in language
theory, and even in the C standard itself: a function has a side effect
if it does something more than just return a value: if it changes state.
This can be some I/O, or it can just be writing to some non-local data.
Side effects are crucial to what a compiler does, and they are used all
over the place (the gcc/ dir has some thousand mentions of it for
example).
Please don't make life hard for everyone by overloading this term.
Segher
next prev parent reply other threads:[~2022-05-18 18:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-17 18:39 Andrew MacLeod
2022-05-18 6:28 ` Richard Biener
2022-05-18 13:20 ` Andrew MacLeod
2022-05-18 18:13 ` Segher Boessenkool [this message]
2022-05-18 20:24 ` Andrew MacLeod
2022-05-18 20:40 ` Segher Boessenkool
2022-05-19 13:22 ` Andrew MacLeod
2022-05-19 22:23 ` Segher Boessenkool
2022-05-20 2:14 ` Andrew MacLeod
2022-05-20 6:25 ` Richard Biener
2022-05-20 6:38 ` Alexander Monakov
2022-05-20 8:04 ` Richard Biener
2022-05-20 8:17 ` Alexander Monakov
2022-05-20 11:49 ` Richard Biener
2022-05-22 18:55 ` Alexander Monakov
2022-05-20 8:11 ` Eric Botcazou
2022-05-20 14:39 ` Segher Boessenkool
2022-05-20 19:18 ` Bernhard Reutner-Fischer
2022-05-25 14:35 ` [COMMITTED] Use infer instead of side-effect for ranges Andrew MacLeod
2022-05-25 16:29 ` Segher Boessenkool
2022-05-20 8:13 ` [PATCH] Add divide by zero side effect Eric Botcazou
2022-05-20 12:09 ` Alexandre Oliva
2022-05-27 19:33 ` Andi Kleen
2022-05-27 19:56 ` Andrew MacLeod
2022-05-28 11:52 ` Eric Gallager
2022-05-30 12:24 ` Richard Biener
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220518181348.GC25951@gate.crashing.org \
--to=segher@kernel.crashing.org \
--cc=amacleod@redhat.com \
--cc=gcc-patches@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).