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x86 Interview Questions & Answers

x86 Interview Questions

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How do MOV and LEA differ in Intel-syntax x86-64 assembly?

MOV with a memory source reads stored data, while LEA computes an effective address expression without reading memory at that address. LEA is often used for pointer calculation or limited arithmetic i...

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How do CMP, JE, JL, and JB differ when comparing integers?

CMP sets arithmetic flags as if subtracting its second operand from its first without storing the result. JE tests equality through the zero flag. JL interprets the comparison as signed, using the sig...

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Why is a calling convention necessary when one function calls another?

A calling convention defines how arguments and return values are passed, which registers the callee must preserve, and how stack-related obligations are handled. Code that violates it can corrupt the ...

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How would you check signed overflow after adding two 32-bit integers in x86-64?

ADD updates arithmetic flags. For signed 32-bit addition, JO branches when the overflow flag is set, meaning the mathematical result is outside the representable signed 32-bit range. Carry indicates a...

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