LEA instruction?

 

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  • What's the purpose of the LEA instruction? 14 answers
  • Using LEA on values that aren't addresses / pointers? 3 answers

    • It's the equivalent of "eax = edx + eax * 1".

    This particular case of lea is an inefficient way to write add %edx, %eax ; only useful if you need to avoid modifying flags. But unlike add , the output can be a register that isn't one of the inputs, and you can do more complex operations.

    Generally, lea (address expression), register means "compute the address expression and change the register value to that"; other instructions use address expressions for memory access, ie mov (address expression), register means "compute the address expression and load the value from the resulting address into the register".

    负载有效地址 - 它与C一元&运算符等价。

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