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* [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
@ 2021-10-09 21:38 ibuclaw at gcc dot gnu.org
2021-10-09 21:43 ` [Bug tree-optimization/102673] " ibuclaw at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: ibuclaw at gcc dot gnu.org @ 2021-10-09 21:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
Bug ID: 102673
Summary: [9 Regression] Wrong code with -O due to
adjust_cond_for_loop_until_wrap
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ibuclaw at gcc dot gnu.org
Target Milestone: ---
Reduced test, when compiled with -O, optimizes the loop into `return 1;`.
---
int main()
{
for (unsigned a = 0, b = 0; a < 6; a += 1, b += 2)
{
if (b < a)
return 1;
}
return 0;
}
---
https://godbolt.org/z/YM7aYrY8v
Bisected, and the commit that changed behaviour was the fix for pr84648.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/102673] [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
@ 2021-10-09 21:43 ` ibuclaw at gcc dot gnu.org
2021-10-09 21:45 ` ibuclaw at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: ibuclaw at gcc dot gnu.org @ 2021-10-09 21:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
--- Comment #1 from ibuclaw at gcc dot gnu.org ---
Since pr101145, the function this now happens in is
number_of_iterations_until_wrap.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/102673] [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
2021-10-09 21:43 ` [Bug tree-optimization/102673] " ibuclaw at gcc dot gnu.org
@ 2021-10-09 21:45 ` ibuclaw at gcc dot gnu.org
2021-10-09 21:58 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: ibuclaw at gcc dot gnu.org @ 2021-10-09 21:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
--- Comment #2 from ibuclaw at gcc dot gnu.org ---
(In reply to ibuclaw from comment #0)
> Bisected, and the commit that changed behaviour was the fix for pr84648.
Commit was r9-4145.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/102673] [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
2021-10-09 21:43 ` [Bug tree-optimization/102673] " ibuclaw at gcc dot gnu.org
2021-10-09 21:45 ` ibuclaw at gcc dot gnu.org
@ 2021-10-09 21:58 ` pinskia at gcc dot gnu.org
2021-10-09 22:01 ` ibuclaw at gcc dot gnu.org
2021-10-09 22:06 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-10-09 21:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
exact dup of bug 102666 :).
*** This bug has been marked as a duplicate of bug 102666 ***
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/102673] [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
` (2 preceding siblings ...)
2021-10-09 21:58 ` pinskia at gcc dot gnu.org
@ 2021-10-09 22:01 ` ibuclaw at gcc dot gnu.org
2021-10-09 22:06 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: ibuclaw at gcc dot gnu.org @ 2021-10-09 22:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
ibuclaw at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|DUPLICATE |FIXED
--- Comment #4 from ibuclaw at gcc dot gnu.org ---
(In reply to Andrew Pinski from comment #3)
> exact dup of bug 102666 :).
>
> *** This bug has been marked as a duplicate of bug 102666 ***
Excellent, I just saw it hit my queue for the D front-end, with no context of
where they got it from. :-)
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/102673] [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap
2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
` (3 preceding siblings ...)
2021-10-09 22:01 ` ibuclaw at gcc dot gnu.org
@ 2021-10-09 22:06 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-10-09 22:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102673
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |DUPLICATE
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** This bug has been marked as a duplicate of bug 102666 ***
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-10-09 22:06 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-10-09 21:38 [Bug tree-optimization/102673] New: [9 Regression] Wrong code with -O due to adjust_cond_for_loop_until_wrap ibuclaw at gcc dot gnu.org
2021-10-09 21:43 ` [Bug tree-optimization/102673] " ibuclaw at gcc dot gnu.org
2021-10-09 21:45 ` ibuclaw at gcc dot gnu.org
2021-10-09 21:58 ` pinskia at gcc dot gnu.org
2021-10-09 22:01 ` ibuclaw at gcc dot gnu.org
2021-10-09 22:06 ` pinskia at gcc dot gnu.org
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