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fa01 homequiz 4

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 #4) October 17 th , 2001 CS152 Computer Architecture and Engineering This quiz covers one of the problems from homework #4. Good Luck! Your Name: SID Number: Discussion Section: Total:
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2 Figure 1: A multicycle data path Figure 1 shows the multicycle datapath from the book. In your homework, you implemented the bcp instruction, which copied a block of words from one location in memory to another. In this problem, we will implement something simpler, namely the block scale ( bscale) instruction: bscale $t1,$t2,$t3 {mem[t1]*$t3 mem[t1], mem[t1+4]*$t3 mem[t1+4], … mem[t1+(t2-1)*4]*$t3 mem[t1+(t2-1)*4]} This instruction takes the value in register $t1, and uses it to scale every word in a block of words of memory of size $t2 words, starting at the address in $t3 . The coding of this instruction is as follows: $t1 is in the RT field, $t2 is in the RS field, $t3 is the sign-extended 16-bit constant from Inst[15:0].
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