------- Comment #3 from pinskia at gcc dot gnu dot org 2007-05-03 22:00 ------- (In reply to comment #2) > there's no mention of "blockage" in the trunk documentation. HUH?
@cindex @code{blockage} instruction pattern @item @samp{blockage} This pattern defines a pseudo insn that prevents the instruction scheduler from moving instructions across the boundary defined by the blockage insn. Normally an UNSPEC_VOLATILE pattern. Which was added by: http://gcc.gnu.org/ml/gcc-patches/2007-01/msg02304.html See also: http://gcc.gnu.org/ml/gcc-patches/2007-02/msg00147.html Which talks about this change. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31801