Perf improvement

[Ben Gamari]

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

> I'm seeing this in validate
>
> bytes allocated value is too low:
>
> (If this is because you have improved GHC, please
>
> update the test so that GHC doesn't regress again)
>
>     Expected    T5837(normal) bytes allocated: 56782344 +/-7%
>
>     Lower bound T5837(normal) bytes allocated: 52807579
>
>     Upper bound T5837(normal) bytes allocated: 60757109
>
>     Actual      T5837(normal) bytes allocated: 52424864
>
>     Deviation   T5837(normal) bytes allocated:     -7.7 %
>
> *** unexpected stat test failure for T5837(normal)

This test has historically been quite unstable. I'm running a validate
as we speak; I'll let you know if I can reproduce this.

Cheers,

- Ben

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