public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/101200] Unneeded AND after shift
Date: Thu, 24 Jun 2021 20:37:38 +0000 [thread overview]
Message-ID: <bug-101200-4-tpSYBpFC1I@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-101200-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101200
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tree-optimization |rtl-optimization
Keywords| |missed-optimization
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This does not make sense:
Trying 12 -> 14:
12: {r93:QI=r82:QI 0>>0x4;clobber flags:CC;}
REG_DEAD r82:QI
REG_UNUSED flags:CC
14: {r95:DI=r93:QI#0&0xf;clobber flags:CC;}
REG_UNUSED flags:CC
REG_DEAD r93:QI
Failed to match this instruction:
(parallel [
(set (reg:DI 95 [ a ])
(zero_extract:DI (subreg:HI (reg:QI 82 [ d.0_1 ]) 0)
(const_int 4 [0x4])
(const_int 4 [0x4])))
(clobber (reg:CC 17 flags))
])
How can you have a subreg of HI and then get a zero_extract of DI?
next prev parent reply other threads:[~2021-06-24 20:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 20:19 [Bug tree-optimization/101200] New: " steinar+gcc at gunderson dot no
2021-06-24 20:37 ` pinskia at gcc dot gnu.org [this message]
2021-06-24 20:45 ` [Bug rtl-optimization/101200] " pinskia at gcc dot gnu.org
2021-06-24 20:50 ` pinskia at gcc dot gnu.org
2021-06-25 9:34 ` [Bug target/101200] " jakub at gcc dot gnu.org
2021-06-25 9:38 ` jakub at gcc dot gnu.org
2021-06-25 10:38 ` steinar+gcc at gunderson dot no
2021-06-29 17:40 ` law 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-101200-4-tpSYBpFC1I@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).