https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61559
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Richard Biener from comment #6) > Seems to me we want > > (bit_xor (bswap32 @0) (bswap32 @1)) -> (bswap32 (bit_xor @0 @1)) > > in match-and-simplify speak. Please note that there are some more interesting transformations involving immediates and bit_not, as shown in builtin-bswap-8.c.
