[Bug tree-optimization/101512] [11/12 Regression] ICE in maybe_trim_constructor_store, at tree-ssa-dse.c:379

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101512

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-07-20
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
# .MEM_16 = VDEF <.MEM_15>
D.2844 = {_2};

that's not valid GIMPLE, but gimplification already produces it.  We have

  D.2844 = {_2};
  _3 = n ();
  _4 = VIEW_CONVERT_EXPR<long unsigned int[8]>(D.2844)[_3];

there, so maybe it's FEs doing wrong as well (failing to set TREE_ADDRESSABLE
or
DECL_NOT_GIMPLE_REG).  I will have a closer look.