WebJan 29, 2010 · inc word ptr[bx]的操作数寻址方式是基址寻址,基址寄存器bx所指定的操作数类型不确定,而指令要求必须是明确的。 此处“WORD”表示操作数类型是一个字(双字 … WebAug 26, 2004 · 0046EFCF . 8B85 88FEFFFF mov eax,dword ptr ss:[ebp-178] 0046EFD5 . 8B40 04 mov eax,dword ptr ds:[eax+4] 这两句指令中 第一句是将 ebp-178 位置存放的 内存地址指针指向的内容 赋值给 eax
1、关于dword ptr 指令-阿里云开发者社区 - Alibaba Cloud
http://yimitumi.com/2024/03/30/%E5%8D%81%E4%B9%9D-word-ptr-%E5%92%8C-byte-ptr-%E6%B1%87%E7%BC%96%E7%AC%94%E8%AE%B0/ WebMar 15, 2024 · dword ptr [eax] - points to memory, which address is eax, so this statement copies 32 bit value from memory to eax. About the why this would happen, it depends on the context. For example, this could be used to load the value of [eax] on the stack, to use it as an argument for a function call. raw waste form
Inc Word PTR指令? - 知乎
Web展开全部. BYTE PTR和WORD PTR分别意思如下所示. BYTE PTR 表示 [DI]处一个字节,指明了指令访问的内存单元是一个字节单元,也就是8位,也就是最大的数为 0FFH,化成10进制数为256。. 指令访问的是内存,是因为加方括号的都是存储器寻址,方括号里的DI是变址寄 … WebMay 2, 2012 · 2 Answers. Sorted by: 13. In the cases you're looking at, the byte ptr and word ptr don't accomplish much. While harmless, the assembler already "knows" that al and dl are byte-sized, and that bx is word-sized. You need something like byte ptr when (for example) you move an immediate value to an indirect address: mov bx, some offset mov [bx], 1. WebApr 8, 2024 · Then add word ptr [freq_array + eax * 2], 1. In 32-bit code you can take advantage of its more powerful addressing modes (compared to 16-bit). Also note that your code would be unsafe if freq_array spans a 64k boundary; add si, ax could wrap without doing carry-out into the high bits of ESI. – Peter Cordes. raw wash jeans