2022年11月11日 · Registers can be used in your software directly with instructions such as mov, add or cmp. The leading e stands for e xtended and means that your register is 32 bits wide. …

2015年5月24日 · %eax is a 32-bit register (just like %al is 8-bit, %ax is 16-bit and %rax is 64-bit). While %rsp in (%rsp) is 64-bit, the expression (%rsp) is a move to the memory location held in …

eax is the 32-bit, "int" size register. It was added in 1985 during the transition to 32-bit processors with the 80386 CPU. I'm in the habit of using this register size, since they also work in 32 bit …

2018年2月7日 · movl %eax,%rdx intel语法是 mov rdx,eax 不同宽度的寄存器之间直接传输是不允许的，就是这么设计的，唯一的例外是通用寄存器和段寄存器之间的传输，允许mov eax,ds之 …

EAX 是"累加器" (accumulator), 它是很多加法乘法指令的缺省寄存器。 EBX 是"基地址" (base)寄存器, 在内存寻址时存放基地址。 ECX 是计数器 (counter), 是重复 (REP)前缀指令和LOOP指令 …

2010年4月13日 · For register eax, using eax means use all 32 bits, ax is the lower 16 bits, and al is the lower 8 bits. The equivalent for ebx is ebx, bx and bl respectively, and so on. Note that if …

2024年1月1日 · For example, 'EAX' is the accumulator register as a 32-bit value. Similarly, in the 64-bit version, the 'E' is replaced with an 'R' (register), so the 64-bit version of 'EAX' is called …

How about increasing the size of a 2-byte quantity to 4 byte? This cannot be done in the same manner because there is no way to access the 16 highest bit of register eax separately!

2024年9月10日 · 数据寄存器，通常用于输入/输出操作，也常与 EAX 一起使用处理乘法和除法操作。 源索引寄存器，常用于字符串操作或指向内存块的源地址。 目标索引寄存器，常用于字 …

Modern (i.e 386 and beyond) x86 processors have eight 32-bit general purpose registers, as depicted in Figure 1. The register names are mostly historical. For example, EAX used to be …