public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/53253] New: Missed opportunity to inline memcmp
@ 2012-05-06  4:08 law at redhat dot com
  2012-05-06  4:54 ` [Bug tree-optimization/53253] " pinskia at gcc dot gnu.org
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: law at redhat dot com @ 2012-05-06  4:08 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53253

             Bug #: 53253
           Summary: Missed opportunity to inline memcmp
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: law@redhat.com


Compile with -O2.  Note the length of the memory to be compared via memcmp is
fixed and just 2 bytes.  It'd be more efficient and possibly smaller to just
inline the necessary comparisons.  Seems to me this ought to be addressed in
our tree optimizers.

int foo(const char* x) {
    return memcmp(x,"xx",2) != 0;
}


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug tree-optimization/53253] Missed opportunity to inline memcmp
  2012-05-06  4:08 [Bug tree-optimization/53253] New: Missed opportunity to inline memcmp law at redhat dot com
@ 2012-05-06  4:54 ` pinskia at gcc dot gnu.org
  2012-05-06  4:56 ` pinskia at gcc dot gnu.org
  2012-05-07  9:25 ` rguenth at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-05-06  4:54 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53253

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-05-06
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-06 04:50:47 UTC ---
Confirmed.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug tree-optimization/53253] Missed opportunity to inline memcmp
  2012-05-06  4:08 [Bug tree-optimization/53253] New: Missed opportunity to inline memcmp law at redhat dot com
  2012-05-06  4:54 ` [Bug tree-optimization/53253] " pinskia at gcc dot gnu.org
@ 2012-05-06  4:56 ` pinskia at gcc dot gnu.org
  2012-05-07  9:25 ` rguenth at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-05-06  4:56 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53253

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-06 04:55:21 UTC ---
Related also to PR 12086.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug tree-optimization/53253] Missed opportunity to inline memcmp
  2012-05-06  4:08 [Bug tree-optimization/53253] New: Missed opportunity to inline memcmp law at redhat dot com
  2012-05-06  4:54 ` [Bug tree-optimization/53253] " pinskia at gcc dot gnu.org
  2012-05-06  4:56 ` pinskia at gcc dot gnu.org
@ 2012-05-07  9:25 ` rguenth at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-05-07  9:25 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53253

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-07 09:22:57 UTC ---
This is a dup of 52171.  RTL/expand parts are tracked in PR12086.

*** This bug has been marked as a duplicate of bug 52171 ***


^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-05-07  9:25 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-05-06  4:08 [Bug tree-optimization/53253] New: Missed opportunity to inline memcmp law at redhat dot com
2012-05-06  4:54 ` [Bug tree-optimization/53253] " pinskia at gcc dot gnu.org
2012-05-06  4:56 ` pinskia at gcc dot gnu.org
2012-05-07  9:25 ` rguenth at gcc dot gnu.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).