Re: Turning on -funbox-small-strict-fields by default in GHC 7.8

On Thu, Apr 25, 2013 at 9:51 PM, Bryan O'Sullivan wrote:

On Thu, Apr 25, 2013 at 4:01 PM, Johan Tibell wrote:

...

I think you could make up a case where it is a loss. It would boil down to repeated reboxing of a value pulled out of a strict field. In practice I think it's pretty hard.

I've seen this in real-world code, though it is indeed rare in my experience.

If you remember where it would be great to see an example. There's also NOUNPACK nowadays so you can opt out in these specific cases.