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Date: Fri, 21 Oct 2011 20:57:00 -0000
From: Richard Henderson <rth@redhat.com>
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To: Peter Bigot <bigotp@acm.org>
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Subject: Re: Expanding instructions with condition codes inter-deps
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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.


r~