Write a program in assembler tor an up8086 ACM86 to perform

Write a program in assembler tor an up8086 (ACM\'86) to perform double precision multiplication. III. Write the same program of question II for the MSP 430.

Solution

II. up8086

III. MSP

; Macro Definition for the signed multiplication 16x16 bits

;

MPYS16 .MACRO arg1,arg2 ; Signed MPY 16x16 bits

MOV arg1,&0132h

MOV arg2,&0138h

.ENDM ; Result in SumExt|SumHi|SumLo

;

; Multiply the contents of two registers R4 and R5

;

MPYS16 R4,R5 ; MPY signed R4 and R5

MOV &SumLo,R6 ; LSBs of result to R6

MOV &SumHi,R7 ; MSBs of result to R7

MOV &SumExt,R8 ; Sign of result to R8

... ; Continue

; Multiply the contents located in a table, R6 points to

; The result is addressed in indirect mode: a NOP is necessary

; to allow the completion of the multiplication

;

MOV #SumLo,R5 ; Pointer to LSBs of result

MPYS16 @R6+,@R6 ; MPY signed table contents

NOP ; Allow completion of MPYS16

MOV @R5+,R7 ; LSBs of result to R7

MOV @R5+,R8 ; MSBs of result to R8

MOV @R5,R9 ; Sign of result to R9

... ; Continue

;

; Macro Definition for the signed multiplication–and–

; accumulation 16x16 bits. The accumulation is made in the

; RAM: MACHi, MACmid and MAClo. If more than 48 bits are used

; for the accumulation, the SumExt register is added to all

; further extensions (RAM or registers) here shown for only

; one extension (48 bits).

;

MACS16 .MACRO arg1,arg2 ; Signed MAC 16x16 bits

MOV arg1,&0132h ; Signed MPY is used

MOV arg2,&0138h

ADD &SumLo,MAClo ; Add LSBs to result

ADDC &SumHi,MACmid ; Add MSBs to result

ADDC &SumExt,MAChi ; Add SumExt to MSBs

.ENDM

;

; Multiply and accumulate signed the contents of two tables

;

MACS16 2(R6),@R5+ ; MAC for the table contents

.... ; Accumulation is yet made