A performance predicament

Richard Eisenberg eir at cis.upenn.edu
Fri Mar 11 18:53:32 UTC 2016

On Mar 11, 2016, at 12:04 PM, Simon Peyton Jones <simonpj at microsoft.com> wrote:

> Profiling prevents optimisation!  

I didn't know that. Why does it do this? It defeats the point of profiling a bit if we can't optimize. I just assumed the optimizer looks through the SCCs, preserving them, but that otherwise SCCs don't get in the way.

Anyway, helpful to know. Is this fact documented in the manual?


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