GHC 6.8.1 SpecConstr

[Stefan O'Rear]

On Thu, Nov 15, 2007 at 09:00:18AM +0000, Simon Peyton-Jones wrote:
> Simon, Ian
> 
> We don't have a good way to test for performance regressions, and we really, really ought to.
> 
> Printing heap allocated, and regarding the test as failed if it get more than 2% worse might be a simple way.  I'd like to have a primitive instruction count too, but that seems harder.  Measuring time is no good at all.
> 
> Quite a lot of bug reports relate to performance, and we just don't have a good way to add regression tests for them.

Perhaps instrument the bytecode interpreter?  This wouldn't help with
NCG performance (obviously), but might do a fairly good job at catching
Simplifier regressions.

Stefan
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