Post-spec optimisation, wen and where

Simon Peyton Jones simonpj at
Thu Dec 13 08:37:17 UTC 2018

I’m afraid I don’t understand the question. Can you show a small test case and make your question concrete?


From: ghc-devs <ghc-devs-bounces at> On Behalf Of Gabor Greif
Sent: 13 December 2018 06:10
To: ghc-devs <ghc-devs at>
Subject: Post-spec optimisation, wen and where

Hi devs,

I am wondering where the optimisation (e.g. simplified) of specialised dictionaries is taking place. In my case -ddump-spec shows unoptimised, but -ddump-simpl-iterations shows already optimised dictionaries (float-out already happened).

I searched yesterday, but to no avail.


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