Reverted your commit

Simon Peyton Jones simonpj at
Thu Apr 28 21:02:40 UTC 2016

I reverted your commit
because it made every single binary that GHC builds seg-fault on windows.  Even
                main = return ()
You may want to review and re-commit it.

commit 24864ba5587c1a0447beabae90529e8bb4fa117a
Author: Simon Marlow <marlowsd at>
Date:   Sat Apr 23 22:14:43 2016 +0100
    Use __builtin_clz() to implement log_2()
        A microoptimisation in the block allocator.
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