Re: i seem to have hit a problem with my new conflict finder.

[Ian Lance Taylor <iant at google dot com>]

Kenneth Zadeck <zadeck@naturalbridge.com> writes:

> There are a lot of ways to handle this problem:
> 1) We could do a pass that breaks multiword sets into individual regs if
> some of those regs are dead.  I guess the downside of this is that such
> insns may not match some patterns anymore.
> 
> 2) We could turn off local.  I was planning on testing this anyway
> because i want to see if local, at this point, is just making global do
> a bad job.   However, my hope is that global or the new allocator from
> vlad is smart enough to properly handle the case where some parts of a
> multiword set are dead. 
> 
> 3) We could fix global/reload to not be stupid.   Because, of course,
> you should be able to put something in that unused regs slot. 
> 
> Any comments.

I think the first step is to figure out what is going wrong.  I don't
see any obvious reason why global or reload should fail in this way,
as long as the multi-word set is properly marked as such at the point
of the set itself.

Ian