[Bug target/93002] while(i--) optimization

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93002

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #4)
> 
> Maybe we can introduce the above insn as insn_and_split pattern that is
> later split to CCmode insns? cmpelim pass will then be able to synthesize
> the insn.

Ah, no... this won't work, the user of flags register needs to be updated, too.