[Bug tree-optimization/120428] [14/15/16 regression] Suboptimal autovec involving blocked permutation and std::copy

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120428

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu.org
          Component|target                      |tree-optimization
             Blocks|                            |121364

--- Comment #18 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a copy prop for aggegrates issue:
  _23 = MEM <uint128_t> [(char * {ref-all})data_9(D)];
  MEM <uint128_t> [(char * {ref-all})&buffer] = _23;
  _18 = MEM <uint128_t> [(char * {ref-all})data_9(D) + 16B];
  MEM <uint128_t> [(char * {ref-all})&buffer + 16B] = _18;
  _16 = MEM <vector(32) unsigned char> [(char * {ref-all})&buffer];

We should see here that `MEM <vector(32) unsigned char> [(char *
{ref-all})&buffer]` is the same thing as loading from data_9(D).


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121364
[Bug 121364] [meta-bug] copy prop for aggregates