Computer Architecture

Answer the following Questions: 1. Consider the following assembly program fragment: add $10, $0, $0 addr: lw $8, 0($9) beq $8, $0, label addi $10, $10, 1 addi $9, $9, 4 j addr label: .... a) Assume that $9 initially contains the byte address of the first element, Array[0], of a vector array called Array which contains consecutive 32 bit integers in memory. Describe precisely in a sentence or two what the program fragment does. b) Suppose the initial value of $9 is (2000)10 (which is the byte address of A[0]). Suppose the array starts with the initial values: A[0] = 1, A[1] = 1, A[2] = ‐2, A[3] = 0, A[4] = 0, A[5] = 2. What values do the registers $8, $9, $10 contain when "label" is reached? 2. Consider the following assembly program. Assume i and j are initially stored in $1 and $2 registers. and $1, $0, $0 and $2, $0, $0 addi $5, $0, 10 loop: slt $6, $1, $5 beq $6, $0, addi $2, $2, 5 addi $1, $1, 1 j loop end: add $1, $2, $0 What are the final value of i and j after the execution of the above program? 3. Write a MIPS code for the following C code fragment: j=0 for (i = 0; i<10; i++) { j+=5; } i =j; 4. Write the following sequence of code into MIPS assembler. x = x + y + z –q Assume x, y, z, and q are stored in registers $S1‐$S4. 5. Write an assembly version of the following C code. For (i = 1; i<100; i++) { A[i] = A[i‐1] + B[i]; }