Question

; assumed A is in r0, B is in r1, ? is in r2, D is in r3 : increment is put into r4, carry2 into r5, low into r6 and high into r MOV r4, #0 MOV r5, r4 ADDS r6, r1, r3 BCC no incr MOV r4,#1 ; initialise incremen t 0 ; initialise carry2 ; low=B+D ; skip if not over 32-bits ; set increment 1 ; high:: A+C ; skip if not over 32-bits no-incr ADDS r7, r0, r2 BCC no_cy2 MOV r5,#1 ; set carry2 1 no_Cy2 ADDS r7, r7, r4 high -high + increment BCC alt_ncy2 MOV r5, #1 ; skip if this part not over 32-bits ; set carry2 ; continue alt_ ncy2 Program 6.1 A partial program performing 64-bit addition

Answer 1

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