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Unit23-FinalReview-EE357-Nazarian-Fall09

# Unit23-FinalReview-EE357-Nazarian-Fall09 - University of...

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EE357 Basic Organization of Computer Systems Final Review University of Southern California University of Southern California Viterbi School of Engineering Viterbi School of Engineering Shahin Nazarian Fall 2009 References: 1) Textbook 2) Mark Redekopp’s slide series 3) ColdFire Documents

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2 Shahin Nazarian/EE357/Fall 2009 Number Systems - Binary Given the binary string “10001101”, what would its decimal equivalent be assuming a 2’s complement representation? ANSWER: -128+8+4+1 = -115
3 Shahin Nazarian/EE357/Fall 2009 Number Theory - Floating Point Assuming the 12-bit IEEE shortened FP format, what is the decimal equivalent of the following number? ANSWER: -1.100010*2 3 = -1100.010 = -12.25 1 10010 100010

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4 Shahin Nazarian/EE357/Fall 2009 Number Theory - Overflow Under what conditions does overflow occur in signed signed arithmetic (addition/subtraction)? ANSWER: when p+p=n or n+n=p Under what conditions does overflow occur in unsigned unsigned arithmetic (addition/subtraction)? ANSWER: If adding, when Cout=1, if subtracting, when Cout=0
5 Shahin Nazarian/EE357/Fall 2009 Number Theory - Rounding Given the following normalized FP number, what would the result be after using the round-to-nearest method? +1.011011 100 * 2 5 ANSWER: Round to 0 in the LSB, so round up to +1.011100*2 5

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6 Shahin Nazarian/EE357/Fall 2009 Performance - Components What is the best metric for performance measurement (i.e. not subject to manipulation or misleading results)? ANSWER: Time (not rates like MIPS, CPI, etc.) What are the three basic components of the performance equation learned in class? ANSWER: Instruction Count, Average CPI, Clock cycle time/period
7 Shahin Nazarian/EE357/Fall 2009 Performance - Compiler Effect Which of the three components of the performance equation would be affected by the choice of compiler?

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