http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624
--- Comment #7 from Uros Bizjak <ubizjak at gmail dot com> 2012-03-22 09:56:18 UTC --- (In reply to comment #6) > I think that the builtin should be expanded into a rotate (left or right) if > they are available. On x86 this works out of the box since the rotates are > there. Please note that the rotate is split back into bswap, so we can avoid rotate by using "xchg %rh, %rl" on P4.
