https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94414
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-12-14
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Severity|normal |enhancement
Component|c++ |tree-optimization
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
To me there looks like an unrolling not happening:
<bb 3> [local count: 1014686026]:
# __first_35 = PHI <__first_15(4), &MEM <const int[4]> [(void *)&arr +
8B](2)>
_14 = MEM[(const int &)__first_35];
if (_14 <= 5)
goto <bb 4>; [94.50%]
else
goto <bb 5>; [5.50%]
<bb 4> [local count: 958878296]:
__first_15 = __first_35 + 4;
if (&MEM <const struct array> [(void *)&arr + 16B] != __first_15)
goto <bb 3>; [94.50%]
else
goto <bb 5>; [5.50%]
But from what I can tell it is we unroll the one loop and then we can't unroll
this one until much later on. It is really interesting testcase.
