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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
2023-08-10 16:22 ` [Bug middle-end/110975] " hubicka at gcc dot gnu.org
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