Re: local-alloc update_equiv_regs and moving register initialization

[John Wehle <john at feith dot com>]

> a is set and used exactly once, and the set is known to be executed.
> It just happens to come after the use.

Exactly.

> Note that you also have to watch out for cases where the set is statically
> before the use, but dynamically after the use in loop order.

Yes.  I was talking from a CFG point of view.

I'll add moving register initialization within loops to my list of
candidates of things to "play with".  Thanks for pointing out some
of the sharp objects. :-)

-- John
-------------------------------------------------------------------------
|   Feith Systems  |   Voice: 1-215-646-8000  |  Email: john@feith.com  |
|    John Wehle    |     Fax: 1-215-540-5495  |                         |
-------------------------------------------------------------------------