public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "terry.guo at arm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59826] ICE caused by mishandling PLD rtx on ARM cortex-m4 target
Date: Thu, 16 Jan 2014 04:10:00 -0000	[thread overview]
Message-ID: <bug-59826-4-Lglyd5oUJ9@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-59826-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59826

--- Comment #1 from Terry Guo <terry.guo at arm dot com> ---
As discussed in http://gcc.gnu.org/ml/gcc-patches/2014-01/msg00875.html, the
root cause should be incorrect insn type of preload instruction. 4.8 assigns
alu type attribute to preload insn which causes other optimization passes think
it can cause data dependence between alu->load/store. The trunk gcc with patch
http://gcc.gnu.org/ml/gcc-patches/2013-09/msg00322.html, correctly assign load1
insn type to preload instruction, which avoids the check of data dependence
between alu->load/store, thereby no such issue. So the best way to fix this
issue in 4.8 is to back port the patch to assign the proper insn type
attribute.


      reply	other threads:[~2014-01-16  4:10 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-15 12:16 [Bug target/59826] New: " terry.guo at arm dot com
2014-01-16  4:10 ` terry.guo at arm dot com [this message]

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-59826-4-Lglyd5oUJ9@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).