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* [Bug rtl-optimization/57812] New: Waste work in computed_jump_p()
@ 2013-07-03 19:13 pchang9 at cs dot wisc.edu
  2013-07-03 20:27 ` [Bug rtl-optimization/57812] Wasted " pchang9 at cs dot wisc.edu
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: pchang9 at cs dot wisc.edu @ 2013-07-03 19:13 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57812

            Bug ID: 57812
           Summary: Waste work in computed_jump_p()
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pchang9 at cs dot wisc.edu
                CC: nistor1 at illinois dot edu

The problem appears in revision 200588 in version 4.9.

In method "computed_jump_p()" in gcc/rtlanal.c, the loop on line 2801 should
break immediately after "has_use_labelref" is set to "1". All the iterations
after "has_use_labelref" set to "1" do not perform any useful work, at best
they just set "has_use_labelref" again to "1".


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57812] Wasted work in computed_jump_p()
  2013-07-03 19:13 [Bug rtl-optimization/57812] New: Waste work in computed_jump_p() pchang9 at cs dot wisc.edu
@ 2013-07-03 20:27 ` pchang9 at cs dot wisc.edu
  2013-07-03 20:39 ` pchang9 at cs dot wisc.edu
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 5+ messages in thread
From: pchang9 at cs dot wisc.edu @ 2013-07-03 20:27 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57812

--- Comment #1 from Po-Chun Chang <pchang9 at cs dot wisc.edu> ---
Created attachment 30441
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30441&action=edit
Suggested patch


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57812] Wasted work in computed_jump_p()
  2013-07-03 19:13 [Bug rtl-optimization/57812] New: Waste work in computed_jump_p() pchang9 at cs dot wisc.edu
  2013-07-03 20:27 ` [Bug rtl-optimization/57812] Wasted " pchang9 at cs dot wisc.edu
@ 2013-07-03 20:39 ` pchang9 at cs dot wisc.edu
  2013-07-22 16:50 ` pchang9 at cs dot wisc.edu
  2021-09-12 21:35 ` pinskia at gcc dot gnu.org
  3 siblings, 0 replies; 5+ messages in thread
From: pchang9 at cs dot wisc.edu @ 2013-07-03 20:39 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57812

--- Comment #2 from Po-Chun Chang <pchang9 at cs dot wisc.edu> ---
Created attachment 30443
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30443&action=edit
Suggested patch


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57812] Wasted work in computed_jump_p()
  2013-07-03 19:13 [Bug rtl-optimization/57812] New: Waste work in computed_jump_p() pchang9 at cs dot wisc.edu
  2013-07-03 20:27 ` [Bug rtl-optimization/57812] Wasted " pchang9 at cs dot wisc.edu
  2013-07-03 20:39 ` pchang9 at cs dot wisc.edu
@ 2013-07-22 16:50 ` pchang9 at cs dot wisc.edu
  2021-09-12 21:35 ` pinskia at gcc dot gnu.org
  3 siblings, 0 replies; 5+ messages in thread
From: pchang9 at cs dot wisc.edu @ 2013-07-22 16:50 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57812

--- Comment #3 from Po-Chun Chang <pchang9 at cs dot wisc.edu> ---
Patch sent to gcc-patches@

http://gcc.gnu.org/ml/gcc-patches/2013-07/msg00931.html


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57812] Wasted work in computed_jump_p()
  2013-07-03 19:13 [Bug rtl-optimization/57812] New: Waste work in computed_jump_p() pchang9 at cs dot wisc.edu
                   ` (2 preceding siblings ...)
  2013-07-22 16:50 ` pchang9 at cs dot wisc.edu
@ 2021-09-12 21:35 ` pinskia at gcc dot gnu.org
  3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-12 21:35 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57812

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED
   Target Milestone|---                         |4.9.0
           Keywords|                            |compile-time-hog

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Patch was committed at r0-124417 so fixed.

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-09-12 21:35 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-07-03 19:13 [Bug rtl-optimization/57812] New: Waste work in computed_jump_p() pchang9 at cs dot wisc.edu
2013-07-03 20:27 ` [Bug rtl-optimization/57812] Wasted " pchang9 at cs dot wisc.edu
2013-07-03 20:39 ` pchang9 at cs dot wisc.edu
2013-07-22 16:50 ` pchang9 at cs dot wisc.edu
2021-09-12 21:35 ` pinskia at gcc dot gnu.org

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