Lea and mov in assembly. The linker will find the final address of msg, add 4 to it (because the pl...

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  1. Lea and mov in assembly. The linker will find the final address of msg, add 4 to it (because the placeholder in the . org > Forums > Non-*NIX Forums > Programming What's the difference between lea and mov in assembly? Programming This forum is for all programming questions. Think in terms of maps and couriers — addresses vs. The question does not have to be directly related to Linux and any language is fair game. In short, LEA loads a pointer to the item you're addressing whereas MOV loads the actual value at that address. The imm32 can be any valid NASM expression. . LEA ax, [BP+SI+5] ; Compute address of value MOV ax, [BP+SI+5] ; Load value at that address Where there are just constants involved, MOV (through the assembler's constant calculations) can sometimes appear to overlap with the simplest cases of usage of LEA. Understanding how MOV, PUSH, POP, and LEA translate to actual memory operations helps you write cache-friendly code and interpret performance profiles. I found a reference to AMD chips at one point having lower latency for lea than for mov, but only by one clock cycle (and this will be immaterial if the data is not in L1 cache). These are the instructions that transfer the data from source to destination. Feb 18, 2016 · 8 When the absolute address is a link-time constant, mov r32, imm32 and lea r32, [addr] will both get the job done. o had the +4 as the displacement). mov and add instructions require a size to be specified in the encoding (1-, 2-, 4- or 8-bytes) — this is sometimes done by naming a target register (e. al, ax, eax, rax), which will inform the assembler of the size. IN, OUT transfer input and output ports. We would like to show you a description here but the site won’t allow us. The purpose of LEA is to allow one to perform a non-trivial address calculation and store the result [for later usage] Jan 15, 2026 · Assembly language, the low-level bridge between hardware and software, is defined by its direct manipulation of registers, memory, and CPU instructions. Would I achieve the same result doing this? : mov rax, dword ptr [rbp-0x50] If so, what is the need for the lea instruction anyways? Thank you for your patience as I am diving into 64b flat assembler - Whats the difference between lea and mov Whats the difference between lea and mov Dec 3, 2014 · 8d 15 c8 90 04 08 lea 0x80490c8,%edx ba c8 90 04 08 mov $0x80490c8,%edx So you use a whole extra byte when the code is loaded into memory if you use lea. Jul 17, 2022 · lea r, [c] equals mov r, c — yes, two different ways to encode the same operation. Sep 15, 2015 · LinuxQuestions. The difference is how it handles the src. src,dst mov, which copies data at the address src to the destination, lea copies itself to the destination. data. Question. Its useful if you have a multi-part calculation with multiple base addresses etc. g. They include: MOV, PUSH, POP, XCHG, XLAT transfer bytes, or words. In this case msg + 4 is a link-time constant. It has the form of an instruction that reads from memory to a register, but it does not reference memory at all. The syntax for the destinations is the same as mov. Oct 21, 2025 · Mix MOV and LEA in practice — load a value, load an address, see the difference. Unlike mov, which copies data at the address src to the destination, lea copies the value of src itself to the destination. Among the most fundamental instructions are MOV (Move) and LEA (Load Effective Address). The lea instruction is related to the mov instruction. Nov 23, 2025 · This blog dives into a real-world scenario where a function pointer crash occurred when moving C++ inline assembly code from Windows to Linux using the Intel Compiler. The only guidebook to x86 Assembly programming you will ever need In this article, we will see different types of data transfer instructions supported by the 8086 microprocessor. We will see the function of each instruction with the help of an assembly language program. LEA 9 Looking at an assembly code snippet I see: lea rax, [rbp-0x50] Which tells me that the rax register now points to whatever value is in rbp-hex (50). dky qvc qds tfg znn din glf yvq jsp tps ugw qyh msi qgz ute