Figure 6.21. Two loops (left and right) on subsequent iterations (top and bottom) showing the effect of uninitialized shift registers (right) vs. initialized shift registers (left)
图6.21。 顺序执行（上边和下边）的两个循环（左边和右边）
Top-down VS. Bottom-up estimates.
自上而下的与自下而上的评估。
Top-down VS. Bottom-up estimates.
自上而下的与自下而上的评估。
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