MIPS Programming: Control Flow and Register Usage, Assignments of Computer Architecture and Organization

Download MIPS Programming: Control Flow and Register Usage and more Assignments Computer Architecture and Organization in PDF only on Docsity! CS232 Fall 2006 Lecture 3: Questions After reading the notes for the Lecture on 9/1, you should be able to answer questions like these: 1. Describe how control would flow in the following MIPS program: main: j getRandom # Call function getRandom # oops, used j instead of jal! j getRandom jr $ra getRandom: # function getRandom jr $ra 2. Describe how control would flow in the following MIPS program: main: li $t0, 10 loop: beq $t0, $0, done sub $t0, $t0, 1 jal loop # oops, used jal instead of j! done: jr $ra 3. Suppose function A calls function B. By choosing the set of registers used by A and the set of registers modified by B appropriately, show that none of the the three strategies for saving registers given on Slides 11–13 always saves the fewest number of registers. Thus, none of these strategies is “best possible”. 1