Re: [tree-ssa] Correct the initialization of an edge flag

[Jan Hubicka <jh at suse dot cz>]

> On Mon, Apr 14, 2003 at 01:53:03AM +0200, Jan Hubicka wrote:
> > > Hi,
> > > 
> > > This patch marks the following edges as fallthru:
> > > 
> > >                LOOP_EXPR
> > > 	           |
> > >                    v
> > >              LOOP_EXPR_BODY 
> > > 
> > > Bootstrapped on i686.  Ok?
> > 
> > What exactly do you need fallthru edges from?  On RTL they are used
> > because the RTL chain is linear, but for trees they IMO have no real
> > equivalent.  In case you mean something else by that it is probably
> > better to invent new flag to avoid common code from being confused.
> > 
> 
> I had an error while building the loops structure and I thought that
> this was a mistake in the tree cfg builder.  
> 
> The EDGE_FALLTHRU flag is already used at the tree level, for example: 
>   make_edge (ENTRY_BLOCK_PTR, BASIC_BLOCK (0), EDGE_FALLTHRU);
> 

Can you give me example for what it is usefull?

Honza