hw5_sol - CDA 3101 Assignment 5 Due in class on Friday,...

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Due in class on Friday, Nov.6 Turn hardcopy in class, stapled, with your name and “CDA 3101 Assignment 5” clearly written on it. Assignments submitted after Nov. 6, 12:35 pm but before Nov. 9, 12:35 pm will be considered one day late. 1. (7 points) Consider the following MIPS assembly language code. bzero: beq $a1, $zero, end loop: sb $zero, 0($a0) addi $a0, $a0, 1 addi $a1, $a1, -1 bne $a1, $zero, loop end: jr $ra Given a 2GHz processor with the CPI’s in the table below, what would be the exact CPU time of this function if the initial value of $a1= 3 ? Instruction Type CPI Arithmetic (add, sub, addi) 3 Memory (load, store) 5 Control (branches and jumps) 4 53 × (1 / (2×10 9 )) = 26.5 × 10 -9 seconds 2. (5 points) Suppose a computer runs at 2GHz. If this computer runs an MPEG-4 video encoder that takes 1 billion instructions and has the following distribution of instructions. 20% Floating point CPI = 3 10% Integer CPI = 1 30% Load CPI = 2 20% Store CPI = 1 15% Branches CPI = 4 5% Other CPI = 1.5 a. What is the effective or average CPI for this video encoder? 0.2 × 3 + 0.1 × 1 + 0.3 × 2 + 0.2 × 1+ 0.15 × 4 + 0.05 × 1.5 = 2.175 CPI b. How long does it take the encoder to execute? 10
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This note was uploaded on 04/29/2010 for the course CDA 3101 taught by Professor Small during the Spring '08 term at University of Florida.

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hw5_sol - CDA 3101 Assignment 5 Due in class on Friday,...

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