On Oct 1, 2019, at 5:14 AM, Segher Boessenkool <seg...@kernel.crashing.org> 
wrote:
> 
> The regrename pass temporarily changes some operand RTL to CC0 so that
> note_stores and scan_rtx don't see those operands.  CC0 is deprecated
> and we want to remove it, so we need to use something else here.
> PC fits the bill fine.

CC0 is, presumably, not part of GENERAL_REGS, but PC is, in some ports.  Does 
that cause a problem here? 

        paul

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