cmpsw.asm

来自「汇编语言 参考书 包含作业与答案 从入门到精通 通俗易懂」· 汇编 代码 · 共 52 行

; This sample shows how
; to use CMPSW instruction
; to compare strings.

#make_COM#

; COM file is loaded at 100h
; prefix:
        ORG     100h

; set forward direction:
        CLD     

; load source into DS:SI,
; load target into ES:DI:
        MOV     AX, CS
        MOV     DS, AX
        MOV     ES, AX
        LEA     si, dat1
        LEA     di, dat2

; set counter to data length:
        MOV     CX, 4

; compare until equal:
        REPE    CMPSW
        JNZ     not_equal

; "Yes" - equal!
        MOV     AL, 'Y'
        MOV     AH, 0Eh
        INT     10h

        JMP     exit_here

not_equal:

; "No" - not equal!
        MOV     AL, 'N'
        MOV     AH, 0Eh
        INT     10h

exit_here:

        RET

; data:
dat1 DW 1234h, 5678h, 9012h, 3456h
dat2 DW 1234h, 5678h, 9012h, 3456h

END