http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55889
--- Comment #26 from Andrey Belevantsev <abel at gcc dot gnu.org> 2013-02-01 12:22:05 UTC --- You are right, your suggestions is what I sketched in comment #21 as choices 1 or 2. Sorry for my unclear expalanation of what was actually happening. I don't have a problem with making sel-sched have extra checks when renaming registers before reload, which will make us notice a not obvious extra dependence and avoid renaming properly, as now we've figured out these dependences don't follow immediately from the RTL. I just want an extra opinion on whether such unexpected dependencies arising when a target (hard) register is replaced by a pseudo register should be normal within GCC, or do we attribute such dependencies only to the register pressure scheduling mode. FWIW, I would rather agree with the latter than with the former.
