http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59952
--- Comment #2 from Thiago Macieira <thiago at kde dot org> --- The Ks and the Rs don't have it. The plain 4770 as well as 4770S do have it. I guess we were too eager with TSX when the announcement came out 2 years ago: it sounded like all Haswell would have it. I don't see a #define for HLE, so that's probably fine to leave XACQUIRE and XRELEASE generation enabled, though. Just make sure there are no uses of the XTEST instruction unless RTM is also enabled or the CPU check was performed.
