http:^^www.cs.wisc.edu^~cs354-2^cs354^solutions^q1.k.html

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Date: Tue, 05 Nov 1996 00:32:04 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Fri, 13 Sep 1996 16:05:29 GMTContent-length: 2671<html><head><title>CS 354 - Quiz #1</title></head><body><table border=0 width=100% align=center><tr><td width=25%><td width=50% align=center><td width=25%><tr><tr><td><b>CS 354<br>Fall 1996 <br>Section 2 </b><td><td align=right><b>Karen's Solution</b><tr><td><td align=center><b>Quiz #1 for Friday September 13</b><br>3 questions, 25 points total<td></table><p><b>1. (7 points) </b> Your computer is running the following SAL program.<code><pre>  .datamsg1:     .asciiz "program started\n"msg2:     .asciiz "program ending\n"aa:       .word 0bb:       .word 6cc:       .word  .text__start:   puts msg1           bge  aa, bb, print_sum           add  cc, cc, aa           add  aa, aa, 1print_sum: put  cc           puts msg2           done</pre></code>Just after the CPU fetches the instruction at label <code>print_sum</code>, the computer breaks. The circuitry in the PC update hardware fails such that the PC is never updated again.  What happens to the execution of the SAL program?<ul>If the PC never changes (gets updated), then the CPU endlessly fetches and executes the instruction <code>put cc</code>.  In this case, <code>cc</code> has the value 0, so the program endlessly prints zeros.</ul><p><b>2. (8 points) </b> The following SAL code contains a single error that causes it to execute incorrectly.<code><pre>  .dataproc1_ra: .wordmsg:      .asciiz "program running. . ."int1:     .wordint2:     .wordint3:     .word  .text__start:  puts msg          move int1, 3          move int2, 20          la   proc1_ra, rara:       b    proc1          doneproc1:    move int1, 3          move int2, 20          mul  int3, int2, int1          b    proc1_ra</pre></code><p>Give an brief (1 sentence) explanation of what goes wrong with this code.<ul>The return from the procedure branches to <code>proc1_ra</code> (into the data section).</ul><p>Show how to fix the code by adding to or modifying it.<ul>Modify the instruction <code>b proc1_ra</code> to be<br><code> b (proc1_ra)</code></ul><p><b>3. (10 points) </b> Write a SAL code fragment that sums and then prints out the result of the integers in the range <code>start <= integer <= end</code>. All variables are of type integer, and variables <code>start</code> and <code>end</code> are assumed to be assigned values before this code fragment is run.<ul>Here is just one possible solution:<br><code><pre>          move sum, 0          move integer, startfor:      bgt  integer, end, done_for          add  sum, sum, integer          add  integer, integer, 1          b fordone_for: put sum</pre></code></ul>

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