[Bug tree-optimization/113783] ICE: in lower_stmt, at gimple-lower-bitint.cc:5455 with -O -mavx512f and _BitInt() in memcpy()

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113783

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This comes from
              scalar_int_mode mode;
              if (int_mode_for_size (ilen * 8, 0).exists (&mode)
                  && GET_MODE_SIZE (mode) * BITS_PER_UNIT == ilen * 8
                  /* If the destination pointer is not aligned we must be able
                     to emit an unaligned store.  */
                  && (dest_align >= GET_MODE_ALIGNMENT (mode)
                      || !targetm.slow_unaligned_access (mode, dest_align)
                      || (optab_handler (movmisalign_optab, mode)
                          != CODE_FOR_nothing)))
where we just care if that huge mode exists, not whether it is supported (but
for moves or in misaligned case movmisalign).