University:
Massachusetts Institute of Technology
Course:
16.01 | Unified Engineering I, II, III, & IV
Academic year:

2019
Views:

282

Pages:

1
Author:

timddslx2

C7 1. Write an algorithm to implement the subtraction operation for two positive integers in assembly language. 1. 2. 3. 4. Let the numbers be A, B and the operation be A-B Convert A into binary Convert B into binary Compute 2’s complement of B i. Invert the bits in B using B xor 11111111 ii. Add 1 to B 5. Add A and the 2’s complement of B. 2. Implement your algorithm in the assembly language describe in the machine language handout. Test your implementation using the SimpleSim simulator. ; Program name ;Programmer ;Last Modified load load load load xor addi addi halt : Subtraction using add only : Joe B : Sep 16 2003 R1,1 ;1 added for computing 2's complement R2,FFh ;mask for flipping the bits R3,first_number; R4, second_number; R5, R4,R2 ; flip the 0's and 1's in the second number R5,R5,R1 ; add 1 to the flipped bits to get the 2's complement R5,R5,R3 ; add the numbers to obtain A - B first_number: second_number: db 8 db 5 ;A in A-B ;B in A-B

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