https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739
--- Comment #44 from Richard Biener <rguenth at gcc dot gnu.org> --- Created attachment 45523 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45523&action=edit workaround So I am testing the following workaround, at least "most suitable" for branches. It avoids generating affected BIT_FIELD_REFs (with bases with integral types that have a precision not matching the size of the mode). Can arm folks please test this patch and aid me (provide) a dg-torture testcase that currently fails? It builds OK on x86_64-linux, I'll test it with the endianess test commented out to see if there's any testsuite fallout. Thanks.