public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "mikulas at artax dot karlin dot mff dot cuni dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/41992] ICE on invalid dereferencing of void *
Date: Wed, 11 Nov 2009 21:06:00 -0000	[thread overview]
Message-ID: <20091111210641.23091.qmail@sourceware.org> (raw)
In-Reply-To: <bug-41992-1600@http.gcc.gnu.org/bugzilla/>



------- Comment #3 from mikulas at artax dot karlin dot mff dot cuni dot cz  2009-11-11 21:06 -------
You can dereference void * in asm arguments --- i.e.
void *p; ... asm volatile ("prefetch %0"::"m"(*p));

gcc warns in this case about the dereference and maybe it shouldn't (but it's
trivial to supress the warning with a cast to char *).

If you change "m" constraint to "mr", you get an ICE.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41992


      parent reply	other threads:[~2009-11-11 21:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-09  2:55 [Bug middle-end/41992] New: " mikulas at artax dot karlin dot mff dot cuni dot cz
2009-11-09 10:17 ` [Bug middle-end/41992] " rguenth at gcc dot gnu dot org
2009-11-09 13:17 ` joseph at codesourcery dot com
2009-11-11 21:06 ` mikulas at artax dot karlin dot mff dot cuni dot cz [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=20091111210641.23091.qmail@sourceware.org \
    --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).