Josh Stone 9aa7dd1e6a Specialize Box clones to try to avoid locals
For generic `T: Clone`, we can allocate an uninitialized box beforehand,
which gives the optimizer a chance to create the clone directly in the
heap. For `T: Copy`, we can go further and do a simple memory copy,
regardless of optimization level.
2021-01-11 17:43:10 -08:00
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2020-09-29 21:39:24 +08:00
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