Simon I reverted your commit https://phabricator.haskell.org/rGHC546f24e4f8a7c086b1e5afcdda624176610cbcf8 because it made every single binary that GHC builds seg-fault on windows. Even main = return () seg-faults. You may want to review and re-commit it. Simon
commit 24864ba5587c1a0447beabae90529e8bb4fa117a Author: Simon Marlow <[email protected]> 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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