http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55889
--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> 2013-01-18 16:57:00 UTC --- Neither insn 24/145 nor insn 28 move through insn 17. The two UNSPEC 44 insn (LC..2,, LCM..2) are inputs to insn 17. The pseudos are moved into r3 and r4, which are the inputs to insn 17.