https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68835
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Seems get_int_cst_ext_nunits already has some code to handle the case of "negative" extra large integers, but only if they have precision multiple of HOST_BITS_PER_WIDE_INT. So I believe we want something for the precisions that aren't multiple of HOST_BITS_PER_WIDE_INT, but are > HOST_BITS_PER_WIDE_INT, too. But not sure what exactly, simply returning larger ext_len in that case does not help.
