3 questions on computer science
Rico the expert
assignment2_f16.pdf
CS 2430 – Assignment 2 Due: Saturday Oct 8th, 11:59 pm on Blackboard Points: 30 Prof. Lei For problems 1-‐8, assume that before each set of instructions, $t0 = 0xFFFFFFFF, $t1 = 0x00000000, $t2 = 0x00000001. Determine the value of $a0 in 32-‐bit Hexadecimal after each set of instructions. 1) add $t3,$t2,$t1 add $t3,$t3,$t0 or $a0,$t3,$0 2) slt $a0,$t1,$t2 add $a0,$a0,$t0 3) and $t3,$t0,$t2 xor $t3,$t3,$t2 move $a0,$t3 4) add $t3,$t0,$t0 add $t3,$t3,$t0 add $a0,$t3,$t0 5) bgez $t2,else addi $a0,$0,1 b next else: addi $a0,$0,0 next: 6) bltz $t2,else addi $a0,$0,1 b next else: addi $a0,$0,0 next: 7) addi $t3,$0,10 addi $a0,$0,0 loop: add $a0,$a0,$t3 addi $t3,$t3,-‐1 bgtz $t3,loop 8) addi $t3,$0,10 b while loop: addi $a0,$a0,1 addi $t3,$t3,-‐1 while: bgez $t3,loop
CS 2430 – Assignment 2 Due: Saturday Oct 8th, 11:59 pm on Blackboard Points: 30 Prof. Lei For problems 9-‐25, express the following pseudo-‐code expressions in assembly language, using as few clock cycles as possible. Declare any necessary assembler directives. Assume that the variable names correspond to MIPS registers (i.e. the variable t0 corresponds to register $t0). 9) s0 = s1 + s2 + s3 10) t0 = (t1 & 1) | 0xFFFF 11) t3 = t2 – t1 – 5 12) while (t0 > 0) { t1 = t1 + t2; t0 = t0 – 1} 13) if (t1 > 0) {s0 = 1} else {s0 = -‐1} 14) printf(“I want to print this string\n”) 15) s2 = 9 * s1 16) s3 = (int) s4 / 16 17) for (t0 = 0; t0 < 10; t0=t0+1) { t1 = t1 + t0 } 18) s2 = *(s1 + 2) # Note: the * is a pointer dereference 19) *(s1 + 3) = s2 20) a0 = &array # Note: array is an assembler directive of
# integer type, with values 1, 2, 3, and 4 21) do { t0 = t0 + t1; t1 = t1 – 1; } while (t1 > 0) 22) for (t2 = 10; t2 >= 0; t2=t2-‐2 ) { t1 = t1 + t2*2; } 23) if ( t1 < 5 ) { t0 = 1; } else { t0 = 0; } 24) t2 = s3/16 + 32*s1 + 10 25) s2 = -‐1 * s1 26) Write a MIPS assembly program that computes the sum of integers N to 1000, where N is input by the user. The program must check to ensure that N lies between 0 through 1000. Run your program using MIPSym2.0 and make sure that the program compiles and functions correctly. (You will be graded based on how well your program compiles and runs on MIPSym2.0)
