Computer Organization and Design: The Hardware/Software Interface

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1 University of California, Berkeley College of Engineering Computer Science Division EECS Fall 2001 John Kubiatowicz Homework Quiz (HW #5) November 7, 2001 CS152 Computer Architecture and Engineering This quiz covers one of the problems from homework #5. Good Luck! Your Name: SID Number: Discussion Section: Total:
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3 In problems 6.26 and 6.27, you were asked to consider a pipeline which does not support a delayed branch . Figure 6.51 from one of the printings of the book is reproduced on the previous page. 1. In this datapath, how many instructions must be “flushed” out of the pipeline when a branch is
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Unformatted text preview: taken? Explain. 2. What must be in the “Control” oval in order to support flushing (i.e. when does it decide to assert IF.Flush)? What exactly does the “IF.Flush” signal do? 3. Consider the following instruction sequence: sub $2, $4, $5 beq $2, $3, somewhere Why doesn’t this code sequence work properly on this hardware (this is a bug in the book!)? 4. Can you fix this problem without adding hardware (i.e. only moving hardware around)? Explain. How many instructions must be “flushed” on a taken branch now?...
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