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由 Shawn O. Pearce 提交于
We only ever generate at most two tree streams at a time. Since most trees are around the same size we can simply recycle the buffers from one tree generation to the next rather than constantly xmalloc'ing and free'ing them. This should perform slightly better when handling a large number of trees as malloc has less work to do. Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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