[Bug middle-end/57790] Waste work in can_move_insns_across()

[pchang9 at cs dot wisc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57790

--- Comment #2 from Po-Chun Chang <pchang9 at cs dot wisc.edu> ---
Patch sent to gcc-patches@

http://gcc.gnu.org/ml/gcc-patches/2013-07/msg00880.html