From: Jason Merrill <jason@redhat.com>
To: Richard Guenther <rguenther@suse.de>
Cc: Richard Guenther <richard.guenther@gmail.com>,
gcc-patches List <gcc-patches@gcc.gnu.org>
Subject: Re: RFA (fold): PATCH for c++/49290 (folding *(T*)(ar+10))
Date: Fri, 10 Jun 2011 14:03:00 -0000 [thread overview]
Message-ID: <4DF223D4.3080700@redhat.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1106101029320.810@zhemvz.fhfr.qr>
On 06/10/2011 04:35 AM, Richard Guenther wrote:
> I'm out of good suggestions ;) You can do the same-qualifier matching
> and simply have a mismatched array element vs. array-ref type.
But I need to allow different qualifiers, too.
> We could also argue that whoever calls fold_indirect_ref_1 with TYPE
> that doesn't even have TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (op0 (!)))
> == TYPE_MAIN_VARIANT (type) is broken.
Right, I only want to fold if the main variants match.
> Thus we could argue that
> even ignoring qualifiers is ok - but I'd be worried about folding
> *((volatile int *)&a[0] + 1) to a[1] with lost volatile qualification.
Right.
It would be correct to fold it to
VIEW_CONVERT_EXPR<volatile int,a[1]>
but I'm not sure how well front ends would deal with that. Maybe I'll
try it and see.
Jason
next prev parent reply other threads:[~2011-06-10 14:02 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-07 5:39 Jason Merrill
2011-06-07 10:20 ` Richard Guenther
2011-06-07 10:27 ` Jakub Jelinek
2011-06-07 12:03 ` Richard Guenther
2011-06-07 12:22 ` Richard Guenther
2011-06-07 13:46 ` Michael Matz
2011-06-07 13:49 ` Richard Guenther
2011-06-07 13:55 ` Jason Merrill
2011-06-07 14:05 ` Richard Guenther
2011-06-07 14:24 ` Jason Merrill
2011-06-09 19:47 ` Jason Merrill
2011-06-10 8:53 ` Richard Guenther
2011-06-10 14:03 ` Jason Merrill [this message]
2011-06-10 14:20 ` Richard Guenther
2011-06-10 14:32 ` Jason Merrill
2011-06-10 14:34 ` Richard Guenther
2011-06-10 14:45 ` Jason Merrill
2011-06-11 18:24 ` Mike Stump
2011-06-12 11:03 ` Richard Guenther
2011-06-13 7:29 ` Mike Stump
2011-06-13 12:46 ` Richard Guenther
2011-06-14 20:31 ` Mike Stump
2011-06-15 9:54 ` Richard Guenther
2011-06-15 18:57 ` Mike Stump
2011-06-16 7:39 ` Richard Guenther
2011-06-17 14:17 ` Michael Matz
2011-06-20 10:24 ` Richard Guenther
2011-06-12 7:58 ` Is VIEW_CONVERT_EXPR an lvalue? (was Re: RFA (fold): PATCH for c++/49290 (folding *(T*)(ar+10))) Jason Merrill
2011-06-12 13:18 ` Richard Guenther
2011-06-12 13:22 ` Richard Guenther
2011-06-13 6:12 ` Mike Stump
2011-06-12 22:42 ` Jason Merrill
2011-06-13 12:44 ` Richard Guenther
2011-06-13 17:59 ` RFA (fold): PATCH for c++/49290 (folding *(T*)(ar+10)) Jason Merrill
2011-06-14 9:10 ` Richard Guenther
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=4DF223D4.3080700@redhat.com \
--to=jason@redhat.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=rguenther@suse.de \
--cc=richard.guenther@gmail.com \
/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).