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assemblyx86gnu-assembleratt

gas: too many memory reference

When compiling the following instruction:

movl 4(%ebp), 8(%ebp)

I got: too many memory reference.

What's wrong with it?

Solution

  • The number before the parenthesis is a byte offset (which causes a memory reference to occur), and you cannot have two of them with movl. You need to move the value temporarily to a register first.

    movl 4(%ebp), %ecx
movl %ecx, 8(%ebp)