Better perf?

Simon Peyton Jones simonpj at
Tue Sep 13 15:38:16 UTC 2016

I’m getting this perf improvement from T5837, which is type-function heavy.  Is anyone else seeing this

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: 48507272 +/-10%

    Lower bound T5837(normal) bytes allocated: 43656544

    Upper bound T5837(normal) bytes allocated: 53358000

    Actual      T5837(normal) bytes allocated: 42384144

    Deviation   T5837(normal) bytes allocated:    -12.6 %

Its good, but I’d quite  like to know which patch made the difference.  Could it be

commit 03541cbae50f0d1cdf99120ab88698f29a278159

Author: Simon Peyton Jones <simonpj at>

Date:   Fri Sep 9 17:42:42 2016 +0100

    Be less picky about reporing inaccessible code

Seems implausible, but possible I suppose.
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