怎樣高效寫彙編代碼

C語言中有變量的概念，而彙編裏沒有。變量指定了內存中佔用的字節數，對它的讀寫可以通過其地址來引用 ，所以我們可以像C語言一樣定義數據類型，並將變量名寫入彙編代碼中。之後在將變量名替換爲地址。
舉例

.section .rodata
	.LC0:.string "%d,%d\n"

.text
.global main
main:
	pushl %ebp
	movl %esp,%ebp
	
	subl $12,%esp
	movl $1,a1
	movl $2,b1
	
	pushl b1
	pushl a1
	pushl $.LC0
	call printf
	addl $12,%esp
	
	movl a1,%eax
	movl %eax,tmp
	movl b1,%eax
	movl %eax,a1
	movl tmp,%eax
	movl %eax,b1
	
	pushl b1
	pushl a1
	pushl $.LC0
	call printf
	addl $12,%esp
	
	movl $0,%eax
	leave
	ret

將a1改爲-4(%ebp)，將b1改爲-8(%ebp)，將tmp改爲-12(%ebp)

.section .rodata
	.LC0:.string "%d,%d\n"

.text
.global main
main:
	pushl %ebp
	movl %esp,%ebp
	
	subl $12,%esp
	movl $1,-4(%ebp)
	movl $2,-8(%ebp)
	
	pushl -8(%ebp)
	pushl -4(%ebp)
	pushl $.LC0
	call printf
	addl $12,%esp
	
	movl -4(%ebp),%eax
	movl %eax,-12(%ebp)
	movl -8(%ebp),%eax
	movl %eax,-4(%ebp)
	movl -12(%ebp),%eax
	movl %eax,-8(%ebp)
	
	pushl -8(%ebp)
	pushl -4(%ebp)
	pushl $.LC0
	call printf
	addl $12,%esp
	
	movl $0,%eax
	leave
	ret