[Bug rtl-optimization/53176] [4.8 Regression] gcc.target/i386/movbe-2.c and gcc.dg/lower-subreg-1.c

[hp at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53176

--- Comment #9 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2012-05-02 
22:27:32 UTC ---
(In reply to comment #8)
> Actually, I think that's what rtlanal.c:rtx_cost should be changed to do, for
> the cases where the targetm.rtx_costs function returns false.

...and not just for non-tieable SUBREGs.  (Why currently just non-tieable
SUBREGs?  That doesn't seem generic.)

brgds, H-P