public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/97386] [8/9/10/11 Regression] wrong code with __builtin_bswap16() of rotated 64bit value
Date: Tue, 13 Oct 2020 17:14:23 +0000 [thread overview]
Message-ID: <bug-97386-4-w7T1LGCPwD@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-97386-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97386
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:f76949cee9560d04d5417481dbcda5ca089c9ebc
commit r11-3855-gf76949cee9560d04d5417481dbcda5ca089c9ebc
Author: Jakub Jelinek <jakub@redhat.com>
Date: Tue Oct 13 19:13:26 2020 +0200
combine: Fix up simplify_shift_const_1 for nested ROTATEs [PR97386]
The following testcases are miscompiled (the first one since my
improvements
to rotate discovery on GIMPLE, the other one for many years) because
combiner optimizes nested ROTATEs with narrowing SUBREG in between (i.e.
the outer rotate is performed in shorter precision than the inner one) to
just one ROTATE of the rotated constant. While that (under certain
conditions) can work for shifts, it can't work for rotates where we can
only
do that with rotates of the same precision.
2020-10-13 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/97386
* combine.c (simplify_shift_const_1): Don't optimize nested ROTATEs
if
they have different modes.
* gcc.c-torture/execute/pr97386-1.c: New test.
* gcc.c-torture/execute/pr97386-2.c: New test.
next prev parent reply other threads:[~2020-10-13 17:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 14:38 [Bug tree-optimization/97386] New: " zsojka at seznam dot cz
2020-10-12 18:04 ` [Bug tree-optimization/97386] " jakub at gcc dot gnu.org
2020-10-12 19:52 ` jakub at gcc dot gnu.org
2020-10-12 19:56 ` jakub at gcc dot gnu.org
2020-10-13 17:14 ` cvs-commit at gcc dot gnu.org [this message]
2020-10-16 11:37 ` cvs-commit at gcc dot gnu.org
2020-10-16 11:38 ` [Bug tree-optimization/97386] [8/9 " jakub at gcc dot gnu.org
2021-04-20 23:29 ` cvs-commit at gcc dot gnu.org
2021-04-22 16:48 ` cvs-commit at gcc dot gnu.org
2021-04-22 17:07 ` jakub at gcc dot gnu.org
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=bug-97386-4-w7T1LGCPwD@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@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).