Expanding instructions with condition codes inter-deps
Fri Oct 21 20:57:00 GMT 2011
On 10/21/2011 09:13 AM, Peter Bigot wrote:
> Are there any existing machine descriptions that do model the carry
> flag separately, specifically to model rotate operations that use the
> carry flag as the destination and source for the shifted bit? Or is
> the best I can do for that is to have the value be an unspec, with a
> use and clobber of the CC register (which currently blows up in
> simplify_subreg, but I'm still experimenting).
I don't believe there are any extant with that behaviour.
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