https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739
--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> --- Oh, and with making U.val a same-sized float type one might be able to test FLOAT_WORDS_BIG_ENDIAN effects (only mmix, pdp11, tilegx and visum affected). Not sure about REG_WORDS_BIG_ENDIAN at all (c6x is the only target defining this).