Question: Given the following disassembly of a function: // int fun( long x ) // x in %rdi fun: xorl %eax,%eax testq %rdi,%rdi setg %al retq

Given the following disassembly of a function:

// int fun( long x ) // x in %rdi fun: xorl %eax,%eax testq %rdi,%rdi setg %al retq

What is the purpose of the first line of assembly:

 xorl %eax,%eax

Question 9 options:

Reset the flags register

Set %eax to zero

It makes the assembly more appealing

Multiply %eax by itself

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