--- Comment #7 from Segher Boessenkool <segher at gcc dot> ---
(In reply to Jakub Jelinek from comment #3)
> Why does sel-sched try to propagate hard registers into insns before RA? 
> The whole point of the combiner changes was not to do that, so that the RA
> can do better job.

That, and *correctness*.  Propagating hard registers can lead to things that
cannot be reloaded.  Even in the simple case here you cannot necessarily
replace the hard reg with a pseudo and end up with valid code.

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