Question: What does this assembly instruction do? lea 0x0(, %rdi, 4) , %eax sub %edi, %eax lea 0x8 (%rax, %rax, 1), %eax I'm trying to understand

What does this assembly instruction do? lea 0x0(, %rdi, 4) , %eax

sub %edi, %eax

lea 0x8 (%rax, %rax, 1), %eax

I'm trying to understand what the C language code equivalent to this would be

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