鉴于变数一被定义为“关键词”,可使用以下最低指示执行“一”=2*I:
解决办法:
MOV EAX, DWORD PTR I
ADD DWORD PTR I, EAX
......
MOV EAX, DWORD PTR I+4
ADC DWORD PTR I+4, EAX
鉴于变数一被定义为“关键词”,可使用以下最低指示执行“一”=2*I:
解决办法:
MOV EAX, DWORD PTR I
ADD DWORD PTR I, EAX
......
MOV EAX, DWORD PTR I+4
ADC DWORD PTR I+4, EAX
X86是little endian 架构。 这意味着,首先储存的数量最少。
例如,0x1234
存储于0x34
,首先在<0x12上。 锡基皮亚条款的内容更多,但我很快总结如下:
Memory location: X X+1
+------+------+
Content (byte) | 0x34 | 0x12 |
+------+------+
<代码>0x1234是怎样储存在记忆中。 因此,如果你在X号记忆点接触到最少重要的星号,那么最重要的星号储存在X+1。 让我们看一看DWORD(0x12345678):
Memory location: Y Y+1 Y+2 Y+3
+------+------+------+------+
Content (byte) | 0x78 | 0x56 | 0x34 | 0x12 |
+------+------+------+------+
在座各位可以接触个人(如上例)或你可以在Y(0x5678)和Y+2(0x1234)的记忆中听一字。 同样,QWORD(0x0001020304050607):
Memory location: Z Z+1 Z+2 Z+3 Z+4 Z+5 Z+6 Z+7
+------+------+------+------+------+------+------+------+
Content (byte) | 0x07 | 0x06 | 0x05 | 0x04 | 0x03 | 0x02 | 0x01 | 0x00 |
+------+------+------+------+------+------+------+------+
因此,你可以认为QWORD由2个DWORDS、4个字或8个字体组成。 你们可以看到,第二(最重要的)词储存在Z+4上。 只要你记住,最不重要的 by/口号/口号首先储存,并且carry/borrow。
因此:
MOV EAX, DWORD PTR I
ADD DWORD PTR I, EAX
加上4个低端tes(DWORD)和工艺组(如果适用的话)的带旗帜,后者是上半部分加起来的(还有翻了一番):
MOV EAX, DWORD PTR I+4
ADC DWORD PTR I+4, EAX
如果把左侧推回,则考虑添加<条码>0x00FF<>/条码>和<条码>0x1001的这个较小例子。 a. 按性别分列:
MOV AX, 0x00FF ; AL=0xFF AH=0x00
MOV BX, 0x1001 ; BL=0x01 AH=0x10
ADD AL, BL ; Add lower parts, the result is 0x100 which
; doesn t fit in 8 bits, i.e. AL=0x00 now and
; the carry flag is set
ADC AH, BH ; Add the most significant bytes together and
; include the carry flag. That is 0x00 + 0x10 + 1 = 0x11
; Final result AX = 0x1100
在X86区,1个WORD为16个轨道,1个DWORD 32个轨道,1个QWORD 64个轨道。 因此,1个QWORD由2个DWORDS组成,其中1个将称为LOW DWORD(这是一个较低的记忆地址,因为X86几乎没有终点员),而另一个我们将称为DWORD。
MOV EAX, DWORD PTR I
ADD DWORD PTR I, EAX
上文增加了LOW DWORD本身。
MOV EAX, DWORD PTR I+4
ADC DWORD PTR I+4, EAX
上文增加了DWORD号,其中考虑到以前增加的任何遗留问题(LOW DWORD本身)。
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