Better perf

[Ben Gamari]

Simon Peyton Jones via ghc-devs <ghc-devs at haskell.org> writes:

> I've just committed this patch sequence
>
> fb9ae288088a3eabc4e1bb4e86fa473a3881d2e2 Make FloatOut/SetLevels idemoptent on bottoming functions
>
> 995ab74b3c55fe3a0299bd94b49e948c942e76d6 Comments only
>
> 1163f4f2fe9aabd722c963497c67c5f8c71ef71b Tiny refactor
>
> 9b2c73ea8082199245bfa6a28390b70b38f87fd1 Make TH_Roles2 less fragile
>
> 9304df5230a7a29d3e992916d133e462b854e55f Fix CSE (again) on literal strings
> In my final validate run (after updating to HEAD) I saw
>
> Unexpected stat failures:
>
>    perf/space_leaks/T4029.run  T4029 [stat too good] (ghci)
>
This one is rather interesting since I have also been seeing this for
quite some time locally, but Harbormaster consistently disagrees.
Moreover, it passes locally if my machine isn't under load. I
haven't yet investigated why allocations are so inconsistent.

Cheers,

- Ben

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