[Bug target/97521] [11 Regression] wrong code with -mno-sse2 since r11-3394

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97521

--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
So at least the tree.c use of get_mask_mode only passes it MODE_VECTOR so
we don't have to second-guess the component size when passed a MODE_INT used
as representation for an integer vector type.

So I'm testing the following

tree
build_truth_vector_type_for_mode (poly_uint64 nunits, machine_mode mask_mode)
{
  gcc_assert (mask_mode != BLKmode);

  unsigned HOST_WIDE_INT esize;
  if (VECTOR_MODE_P (mask_mode))
    {
      poly_uint64 vsize = GET_MODE_BITSIZE (mask_mode);
      esize = vector_element_size (vsize, nunits);
    }
  else
    esize = 1;

  tree bool_type = build_nonstandard_boolean_type (esize);

  return make_vector_type (bool_type, nunits, mask_mode);
}