函数原型

extern void fastcpy(void *s1, void *s2, char n);

汇编代码

NAME FASTCPY

#include "CH552.H"

?PR?_fastcpy?FASTCPYSEGMENTCODE

?DT?_fastcpy?FASTCPYSEGMENTDATA OVERLAYABLE

PUBLIC_fastcpy

PUBLIC?_fastcpy?BYTE

RSEG?DT?_fastcpy?FASTCPY

?_fastcpy?BYTE:

DS7

RSEG?PR?_fastcpy?FASTCPY

_fastcpy:

INCXBUS_AUX

MOVDPL,R1

MOVDPH,R2

DECXBUS_AUX

MOVDPL,?_fastcpy?BYTE+05H

MOVDPH,?_fastcpy?BYTE+04H

MOVR7,?_fastcpy?BYTE+06H

LOOP:MOVXA,@DPTR

INCDPTR

DB0A5H

DJNZR7,LOOP

RET

END