Question

What is the purpose of the CDQ instruction?

a.

To convert an unsigned 32-bit integer to a 64-bit integer

b.

To convert a signed 32-bit integer to an unsigned 64-bit integer

c.

To convert a signed 32-bit integer to a signed 64-bit integer

d.

To clear the upper 32 bits of a 64-bit integer

Posted under Reverse Engineering

Answer: (c).To convert a signed 32-bit integer to a signed 64-bit integer Explanation:The CDQ instruction is used for converting a signed 32-bit integer in EAX to a 64-bit sign-extended integer in EDX:EAX, indicating that the following code will treat EDX and EAX together as a signed 64-bit integer.

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