Better perf

[Joachim Breitner]

Hi,

Am Dienstag, den 07.03.2017, 22:55 +0000 schrieb Simon Peyton Jones via
ghc-devs:
> > But: binary-trees runtime increases by 5%.
> 
> David: might you look to see if there is any obvious reason for this
> regression?  We could just accept it, but it's always good to know
> why, and to document it.

Turns out that my commit
Add rule mapFB c (λx.x) = c
fixed that regression:
https://perf.haskell.org/ghc/#revision/2fa44217c1d9722227297eefb0d6c6aed7e128ca

Maybe there is just a performance cliff there, and these jumps don’t
really mean anything.

Greetings,
Joachim

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
  XMPP: nomeata at joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org
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