How aggressive is CSE about removing redundant CC sets?

[Kazu Hirata]

Hi Ulrich,

> The advantage of the last is that it, like the first, is accepted
> by single_set, and thus takes part in many optimization steps
> the second pattern doesn't.  It will be chosen by combine if only
> the result of the comparison is needed.

Now I fully understand your "3 patterns for each instruction" scheme.

Thank you very much!

Kazu Hirata