What is the single MIPS instruction or the shortest sequence of MIPS instruction

Question

What is the single MIPS instruction or the shortest sequence of MIPS instructions that performs:

a. clears a word at memory location 524,298

b. y[30] = y[40] + x, assuming x corresponds to register R9, and y is an array of integers with y[0] an integer at the memory location 1,048,596

c. x = y * w, assuming x, y, and w are integer variables in memory locations 4000,2000, and 3004, respectively.

d. if (x => y) Goto lab1
Assume that variable x corresponds to a word at memory address 800, and variable y corresponds to a word at memory address 1000. The instruction with lab1 is after the branch instruction and there are 30 instructions between those two instructions.

Explanation / Answer

Solution:

lui stands for load upper immediate

a.

Move content of register r10 into register r22.

    add r22,r0,r10

Load registers r15 with the value 524,298

            lui r15, 4

            addi r15, r15, 1

Store the value 49,153 into a word at memory location 1,048,596

            ori r15, r0, 0b1100000000000001

             sw r15, 1,048,596 (r0)

b.

Load the instruction in register r8.

Add values

Store the values in r8 register.

lui r1, 8                                               r1 <- &y[0]

lw r8, 40(r1)

add r8, r8, r9

sw r8, 30(r1)

c.

Load the instruction in register r1.

Load the instruction in register r2.

Multiply values of register r1 and r2

Store the value in register r1.

lw r1, 2000(r0)                                                          r1 <- y         

lw r2, 3004(r0)                                                          r2 <- w

mul r1, r2

mflo r1

sw r1, 4000(r0)

d.

Load the instruction in register r30

            lw r30,800(0)

            slt r1, r10, r30

            beq r1, r0, -29

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.