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Re: [call graph, patch] Reuse call graph edges
On Fri, Sep 12, 2008 at 9:35 PM, Jan Hubicka <hubicka@ucw.cz> wrote:
>> >>>>> "Martin" == Martin Jambor <mjambor@suse.cz> writes:
>>
>> Martin> +/* Head of a linked list of unused (freed) call graph edges. */
>> Martin> +static GTY(()) struct cgraph_edge *free_edges;
>>
>> Did you consider marking this GTY((deletable))?
> That would make UID recycling to depend on GGC runs that would
> eventually cause divergences in compilation. We probably should drop a
> comment here.
I thought of this myself and agree that it would be a bad idea.
With the freelist available it should be possible to compute and dump
"sparseness" of the edge UIDs - I'd be interested in the results and if
keeping the freelist sorted would be a win (so we'd re-use from lower UIDs).
Richard.