[Bug c++/70277] Improve code generation for large initializer lists

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70277

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2016-03-17 00:00:00         |2024-12-20

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Unrelated to the original mentioned problem is we have a missed optimization,
take the reduced testcase in comment #3:
  _4 = MEM[(const char * const *)&C.1 + ivtmp.185_189 * 8];
...
  if (_4 == 0B)
    goto <bb 4>; [0.00%]
  else
    goto <bb 5>; [100.00%]


That comparison against 0 should have been optimized away as we know none of
elements of C.1 are nullptr:
C.1.0:
        .quad   .LC2
        .quad   .LC3
        .quad   .LC4

Is there a way to mark that as such?