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ORC: prepare for another patent-pending optimization (#15996)

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* ORC: prepare for another patent-pending optimization

* bugfix

* '=copy' for refs can take a cyclic parameter for more ORC optimizations

* ORC: exploit the common 'it = it.next' pattern

* can't hurt to check for nil

* use an algorithm that is not obviously broken

* restore the test case

* final cleanups for --gc:orc
This commit is contained in:
Andreas Rumpf 2020-11-18 22:31:06 +01:00 • committed by GitHub
commit b9eb91cbb5
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7 changed files with 147 additions and 39 deletions
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@ -38,6 +38,10 @@
- Added `asyncdispatch.activeDescriptors` that returns the number of currently
active async event handles/file descriptors
- ``--gc:orc`` is now 10% faster than previously for common workloads. If
you have trouble with its changed behavior, compile with ``-d:nimOldOrc``.
- `os.FileInfo` (returned by `getFileInfo`) now contains `blockSize`,
determining preferred I/O block size for this file object.