A related question I have is that I've some code that will map the singleton Nats to Ints, and last time I looked into this/ had a chat on the ghc-users list, it sounded like sometimes having Integer values constructed in between are unavoidable. Is that still the case with post 7.6.1 ghc? (And or, how might I be able to help?) On Friday, December 14, 2012, Ian Lynagh wrote:
On Fri, Dec 14, 2012 at 12:53:36PM -0800, Johan Tibell wrote:
I've been tracking down a few (unrelated) performance bugs related to conversions between primitive types. What these issues had in common is that some rule failed to fire and the conversion went via Integer, killing performance. How do we best write a test that make sure that fromIntegral conversions between these types don't regress? Is it possible to test the output of the simplifier or do we have to do something less direct, like writing a loop that does such conversions and make sure that the allocation stay low?
We have some tests looking at the -ddumjp-simpl output, e.g. integerConstantFolding. I'm not sure if we have one for type conversions OTTOMH.
Thanks Ian
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