WebFeb 11, 2024 · Arithmetic instructions are used to perform simple arithmetic operations. ADD, SUB, INC and DEC are the most commonly used arithmetic instructions. In the preceding program, the MOV instruction copies the value 2 into EAX register. Next, ADD EAX, 8 instruction is used to add the value 8 to this value. Webeax是一个特殊的寄存器,在普通编程时不能用,在一种叫保护模式的模式下(其实普通情 …
如何正确地使用System.Numerics.Vector 以获取更高的计算性 …
WebFeb 22, 2015 · Sep 16, 2014 at 1:45. The one-byte inc/dec has been deprecated in x86_64 (which is the case of the OP), because those opcodes were used for REX prefix. – phuclv. Mar 6, 2015 at 18:21. inc eax must be encoded s FF C0 in x86_64, which is not 1 byte, but still shorter than add eax, 1. – phuclv. Mar 6, 2015 at 18:33. WebnhPhc mov eax, 1 是5个字节: b8 01 00 00 00 。 由于8字节的字面值和QWORD前缀: 48 … the outer limits the camp
How much does the INC instruction in x86 assembly add?
WebJul 23, 2024 · inc和dec指令. inc 加1指令 dec 减1指令 一、加一指令inc inc a 相当于 add a,1 //i++ 优点 速度比add指令快,占用空间小 这条指令执行结果影响AF、OF、PF、SF、ZF标志位,但不影响CF进位标志位. 二、减一指令dec dec a 相当于 sub a,1 004012D7 > 83E8 01 SUB EAX,1 004012DA 836D FC 01 SUB DWORD ... WebApr 15, 2010 · 学 Win32 汇编 [26] - 加减指令: INC、DEC、NEG、ADD、ADC、SUB、SBB … Webmov eax, [ebp+var_4] inc eax But the actual instructions involved an extra move. mov eax, [ebp+var_4] mov ecx, eax // <----- ? inc eax In the add instruction, the extra move isn't there. When I modified the code with a decrement operation, I see that extra move as well. Is there some purpose for this move from eax to ecx? ... the outer limits the inheritors part 2