public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/16427] dead memset not optimized away
[not found] <bug-16427-4@http.gcc.gnu.org/bugzilla/>
@ 2011-03-09 14:56 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-03-09 14:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16427
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-09 14:56:26 UTC ---
Related to this is
struct X { int i; int j; int k; };
void foo (void)
{
struct X a, b;
__builtin_memcpy (&a, &b, 4);
}
where we are unable to DCE the memcpy call.
Both issues should be tackled at tree DCE level by better handling of
aliased (local) variables. Needs the same infrastructure changes as
PR41490.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/16427] dead memset not optimized away
[not found] <bug-16427-7834@http.gcc.gnu.org/bugzilla/>
@ 2010-06-09 12:00 ` rguenth at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-06-09 12:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2010-06-09 11:59 -------
It's now optimized by RTL DSE but we keep the stack allocated.
Re-confirmed on the tree-level. Should be easy to extend DSE to handle this.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2006-10-22 22:17:10 |2010-06-09 11:59:50
date| |
Summary|dead 0 memset not optimized |dead memset not optimized
|away |away
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16427
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2011-03-09 14:56 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <bug-16427-4@http.gcc.gnu.org/bugzilla/>
2011-03-09 14:56 ` [Bug tree-optimization/16427] dead memset not optimized away rguenth at gcc dot gnu.org
[not found] <bug-16427-7834@http.gcc.gnu.org/bugzilla/>
2010-06-09 12:00 ` rguenth at gcc dot gnu dot org
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).