https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82580
--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> --- Created attachment 42393 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42393&action=edit Prototype patch Attached patch generates: foobar: cmpq %rdx, %rdi sbbq %rcx, %rsi setb %al ret