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'Extraordinary' scale
，这一点在safew官方版本下载中也有详细论述
Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.
// 步骤2：按位置降序排序（离终点越近的车越先处理）
First, Apple prognosticators like Mark Gurman at Bloomberg have predicted that Apple will make several announcements in the days leading up to March 4, and Cook has now seemingly confirmed these rumors. All eyes will be on Apple come Monday, March 2.