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Question

Why are LEA instructions used by compilers in some cases?

a.

They are faster than ADD and SUB instructions.

b.

They can distinguish between pointers and integers.

c.

They can perform memory accesses more efficiently.

d.

They are more compatible with Pentium 4 processors.

Posted under Reverse Engineering

Answer: (a).They are faster than ADD and SUB instructions. Explanation:On older implementations of IA-32, the LEA instruction was considered to be faster than ADD and SUB, which brought many compilers to use LEA for quick additions and shifts.

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