Computer Organization and Design: The Hardware/Software Interface

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1 University of California, Berkeley College of Engineering Computer Science Division EECS Spring 1999 John Kubiatowicz Homework Quiz (HW #5) April 5, 1999 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 problem 6.26, 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 doesnt this code sequence work properly on this hardware (this is a bug in the book!)? 4. Can you fix this problem without increasing the number of instructions flushed on a taken branch? If so, how? If not, why not? You can use space on the back of this sheet if necessary....
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sp99 homequiz 5 - taken? Explain. 2. What must be in the...

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