[PATCH 3/3] Record template specialization hash

[Jason Merrill]

On 10/2/24 7:53 AM, Richard Biener wrote:
> For a specific testcase a lot of compile-time is spent in re-hashing
> hashtable elements upon expansion.  The following records the hash
> in the hash element.  This speeds up compilation by 20%.
> 
> There's probably module-related uses that need to be adjusted.
> 
> Bootstrap failed (guess I was expecting this), but still I think this
> is a good idea - maybe somebody can pick it up.

Applying the attached, thanks!

> Possibly instead of having a single global hash table having one per ID would be
> better.

That sounds excessive to me.  Is the actual hashtable lookup significant 
in the profile?

> The hashtable also keeps things GC-live ('args' for example).

Those args should also be referenced by TI_ARGS from the respective 
template specialization.

Jason
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