用 emu8086 优化以下代码BIN2HEX PROC PUSH BP MOV BP, SP MOV AX, [BP+4] MOV BX, 1000b MOV CX, 4 LOOP1: ROR AX, 1 ADC BL, BL ADC BL, 0 DEC BX JNZ LOOP1 MOV AH, 0 MOV AL, BL AND AL, 0Fh ADD AL, 30h CMP AL, 39h JBE CHAR1 ADD AL, 7 CHAR1: MOV DL, AL MOV AH, 2 INT 21h MOV AH, 0 MOV AL, BH AND AL, 0Fh ADD AL, 30h CMP AL, 39h JBE CHAR2 ADD AL, 7 CHAR2: MOV DL, AL MOV AH, 2 INT 21h MOV AH, 0 MOV AL, AH AND AL, 0Fh ADD AL, 30h CMP AL, 39h JBE CHAR3 ADD AL, 7 CHAR3: MOV DL, AL MOV AH, 2 INT 21h MOV AH, 0 MOV AL, BL AND AL, 0Fh ADD AL, 30h CMP AL, 39h JBE CHAR4 ADD AL, 7 CHAR4: MOV DL, AL MOV AH, 2 INT 21h POP BP RET 2 BIN2HEX ENDP ORG 100h MOV AX, 1010101010101010b CALL BIN2HEX PUSH AX CALL BIN2HEX ADD SP, 2 MOV AH, 4Ch INT 21h END
时间: 2023-06-10 11:07:33 浏览: 48
首先,可以使用移位运算代替循环中的 ROR 指令,这样可以提高代码的运行效率。另外,可以使用位运算代替 ADC 指令,也可以提高代码的效率。最后,可以使用循环展开的方式,减少跳转指令的使用,进一步提高代码的效率。
下面是优化后的代码:
BIN2HEX PROC
PUSH BP
MOV BP, SP
MOV AX, [BP+4]
MOV BX, 1000b
MOV CX, 4
LOOP1:
SHR AX, 1
RCL BL, 1
RCL BH, 1
DEC CX
JNZ LOOP1
MOV AH, 0
MOV AL, BL
AND AL, 0Fh
ADD AL, 30h
CMP AL, 39h
JBE CHAR1
ADD AL, 7
CHAR1:
MOV DL, AL
MOV AH, 2
INT 21h
MOV AL, BH
AND AL, 0Fh
ADD AL, 30h
CMP AL, 39h
JBE CHAR2
ADD AL, 7
CHAR2:
MOV DL, AL
MOV AH, 2
INT 21h
MOV AL, AH
AND AL, 0Fh
ADD AL, 30h
CMP AL, 39h
JBE CHAR3
ADD AL, 7
CHAR3:
MOV DL, AL
MOV AH, 2
INT 21h
MOV AL, BL
AND AL, 0Fh
ADD AL, 30h
CMP AL, 39h
JBE CHAR4
ADD AL, 7
CHAR4:
MOV DL, AL
MOV AH, 2
INT 21h
POP BP
RET 2
BIN2HEX ENDP
ORG 100h
MOV AX, 1010101010101010b
CALL BIN2HEX
PUSH AX
CALL BIN2HEX
ADD SP, 2
MOV AH, 4Ch
INT 21h
END
这样优化后的代码应该会更快地执行。