difference between movl and leal instruction

2018-06-25 20:49:46

This question already has an answer here:

What's the purpose of the LEA instruction? 14 answers

assembly leal and movl difference [duplicate] 1 answer

movl %esi, 0x8(%esi) is a register to memory move. The first operand is a register, it does not reference memory.

On the other hand, leal %esi, 0x8(%esi) doesn't even exist, since you can't take the address of a register, and also lea can't write to memory.

If you want to copy memory you normally need to go through a register, such as:

movl (%esi), %eax
movl %eax, 0x8(%esi)

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