Suggestion for a fix to Bug middle-end/20177

[James E Wilson]

Paul Schlie wrote:
>>Steven Bosscher wrote:
>>IIRC these notes are for CCO, and you have to move the CC setter
>>and user together.
> - unless it can be guaranteed that the particular setter's cc, will be
>   preserved (i.e. not corrupted by successive operations) prior to it's
>   ultimate use; ...

Steven was correct.  cc0 is special.  See the code.

>>Actually I think SMS for CC0 targets is Just Silly to do at all ;-)
> - with the exception that it should be useful to eliminate otherwise
>   unnecessary explicit comparison operations ...

Likewise.  But this will hopefully be moot soon if Ian succeeds in 
eliminating cc0.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com