学习笔记汇编基础学习笔记

汇编基础04：循环

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  1. 1. 汇编基础04：循环

汇编基础04：循环

循环控制指令：LOOP

格式：LOOP 标号

功能：(CX) <–（CX）-1，（CX）<>0，则转移至标号处循环执行，直至(CX)=0，继续执行后续指令

LOOP执行一次，cx-1，如果cx=0，则会无限循环

示例：

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.586
.MODEL flat, stdcall
.code
main proc
	mov eax ,1
	mov ebx ,1
	mov ecx ,3
s:
	add eax ,ebx
	loop s
	mov eax ,eax
main ENDP
END main

练习：1+2+3+…+100

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.586
.MODEL flat, stdcall
.code
main proc
	mov eax ,0
	mov ecx ,100
s:
	add eax ,ecx
	loop s
	mov eax ,eax
main ENDP
END main

练习：1+2+4+8+….+2147483648(0x80000000)

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.586
.MODEL flat, stdcall
.code
main proc
	mov eax ,1
	mov ebx ,0
	mov ecx ,32
s:
	mov edx ,2
	add ebx ,eax
	mul edx
	loop s
	mov eax ,eax
main ENDP
END main