https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The vectorizer sees
<bb 3> [local count: 214748368]:
# a.3_5 = PHI <_2(5), 2(2)>
# ivtmp_9 = PHI <ivtmp_3(5), 3(2)>
_14 = b[a.3_5];
c[a.3_5][0] = _14;
c[a.3_5][1] = _14;
c[a.3_5][2] = _14;
c[a.3_5][3] = _14;
_2 = a.3_5 + -1;
ivtmp_3 = ivtmp_9 - 1;
if (ivtmp_3 != 0)
goto <bb 5>; [89.00%]
else
goto <bb 4>; [11.00%]
<bb 5> [local count: 191126048]:
goto <bb 3>; [100.00%]
and uses SLP, this is likely caused by my patch to allow non-grouped-loads
there.
t.c:7:17: note: node 0x4637048 (max_nunits=4, refcnt=1) vector(4) int
t.c:7:17: note: op template: _14 = b[a.3_5];
t.c:7:17: note: stmt 0 _14 = b[a.3_5];
t.c:7:17: note: stmt 1 _14 = b[a.3_5];
t.c:7:17: note: stmt 2 _14 = b[a.3_5];
t.c:7:17: note: stmt 3 _14 = b[a.3_5];
t.c:7:17: note: load permutation { 0 0 0 0 }
I think we need to force strided-SLP for them.
