Re: Unpack primitive types by default in data

On Tue, Feb 28, 2012 at 1:11 AM, Simon Marlow wrote:

I think there are some in GHC - I've been surprised occasionally when adding an UNPACK makes things worse.

I just realized that there is a failure mode I didn't quite consider: having a mix of strict and non-strict primitive fields. While this can happen on purpose, I think it happens more often due to non-strict being the default. Having a field with such a mix might lead to more re-boxing. Cheers, Johan