[Bug target/98807] [11 Regression] wrong code with -O2 -mno-sse2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98807

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, OK, as I feared.  We use TImode (not BLKmode) for
vector(2) <signed-boolean:64>.  I wonder if we can simplify vector_element_bits
with the constraints we now have in place for bool vector build.  That is,

unsigned int
vector_element_bits (const_tree type)
{
  gcc_checking_assert (VECTOR_TYPE_P (type));
  if (VECTOR_BOOLEAN_TYPE_P (type))
    return TYPE_PRECISION (TREE_TYPE (type));
  return tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)));
}

looks like it should work and it avoids fragile checking of the mode.