LOOP_HEADER tree code?

[Andrew Pinski]

> 
> On 10/25/06, Steven Bosscher <stevenb.gcc@gmail.com> wrote:
> 
> > You could use TREE_USED,  but your suggestion implies that dead code
> > should be retained in the program,
> 
> May be I misunderstood, but it is not dead code. Here is what Zdenek said,

The question now has come to the following point:

Do we want to explict in the IR or have a side table which we use to mark the
SSA_NAME as still useful. 

They both have pros and cons.  But I say we want to be as explict in the IR
as possible.

Thanks,
Andrew Pinski

PS sorry about my return email address, the machine which I use elm from had
crashed and then they cloned it and did not fix up the email address issue.