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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/97223] Failure to optimize comparison of char arithmetic to single comparison
Date: Mon, 28 Sep 2020 07:33:36 +0000 [thread overview]
Message-ID: <bug-97223-4-KOrOnwviGS@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-97223-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97223
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2020-09-28
Status|UNCONFIRMED |NEW
Keywords| |easyhack
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It works for 'unsigned char' but not for signed char (or signed short) which
are promoted to 'int' and then shortened to unsigned arithmetic:
return <retval> = (short int) ((unsigned short) x + 5) > x;
there's existing patterns that would need to be amended for the extra
conversion.
next prev parent reply other threads:[~2020-09-28 7:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 7:14 [Bug tree-optimization/97223] New: Failure to optimize comparison of char arithmetic to comparison gabravier at gmail dot com
2020-09-28 7:33 ` rguenth at gcc dot gnu.org [this message]
2020-10-31 5:18 ` [Bug tree-optimization/97223] Failure to optimize comparison of char arithmetic to single comparison erozen at microsoft dot com
2020-11-07 1:54 ` erozen at microsoft dot com
2021-01-14 21:13 ` erozen at microsoft dot com
2021-08-24 19:38 ` arjun.is at lostca dot se
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