[Bug rtl-optimization/70944] [7 Regression] ICE in immed_wide_int_const, at emit-rtl.c:606 with -O3

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70944

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'd say we really don't want vector mode ZERO_EXTRACTs/SIGN_EXTRACTs, so
perhaps
make_extraction could give up in that case, maybe:
  /* Never narrow an object, since that might not be safe.  */

  if (mode != VOIDmode
      && GET_MODE_SIZE (extraction_mode) < GET_MODE_SIZE (mode))
    extraction_mode = mode;

and inside of if just do
    {
      /* Avoid vector mode extractions.  */
      if (VECTOR_MODE_P (mode))
        return NULL_RTX;
      extraction_mode = mode;
    }
Or should we punt even earlier?