[Bug middle-end/110975] New: Missed unlooping

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* [Bug middle-end/110975] New: Missed unlooping
@ 2023-08-10 16:00 hubicka at gcc dot gnu.org
  2023-08-10 16:22 ` [Bug middle-end/110975] " hubicka at gcc dot gnu.org
  0 siblings, 1 reply; 2+ messages in thread
From: hubicka at gcc dot gnu.org @ 2023-08-10 16:00 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110975

            Bug ID: 110975
           Summary: Missed unlooping
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

This is what we generate from loop-split for hmmer benchmark:

int *a;
void
test (int n)
{
        int i;
        for (i=0 ; i < n; i++)
                a[i]++;
        for (i=0 ; i <= n; i++)
                a[i]--;
}

The second loop never iterates but we don't seem to be able to figure this out
and leave the loop around.

^ permalink raw reply	[flat|nested] 2+ messages in thread

* [Bug middle-end/110975] Missed unlooping
  2023-08-10 16:00 [Bug middle-end/110975] New: Missed unlooping hubicka at gcc dot gnu.org
@ 2023-08-10 16:22 ` hubicka at gcc dot gnu.org
  0 siblings, 0 replies; 2+ messages in thread
From: hubicka at gcc dot gnu.org @ 2023-08-10 16:22 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110975

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Sorry, got the testcase wrong. Fixed one

int *a;
void
test (int n)
{
        int i;
        for (i=0 ; i < n; i++)
                a[i]++;
        for (; i <= n; i++)
                a[i]--;
}
seems to work correctly so I need to figure out why it does not when produced
by loop-split.

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2023-08-10 16:00 [Bug middle-end/110975] New: Missed unlooping hubicka at gcc dot gnu.org
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