[Bug tree-optimization/88567] [9 Regression] ICE in get_initial_defs_for_reduction when building 521.wrf_r on AArch64 SVE

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88567

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

           What    |Removed                     |Added
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                 CC|                            |rguenth at gcc dot gnu.org
   Target Milestone|---                         |9.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I've touched this for a bugfix recently.  Possibly

  if (!TYPE_VECTOR_SUBPARTS (vector_type).is_constant (&nunits))
    nunits = group_size;

is causing this.  OTOH I don't see how this ever can end up in an
out-of-bound elts[nunits - number_of_places_left_in_vector - 1] access...

If you can provide a (reduced) testcase I can have a look next year.