Program size for different instruction set approaches, Computer Engineering

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Q. Program size for different Instruction Set Approaches?

Assumptions:

Complex Instruction is: Add C, A, B having 16 bit addresses and 8 bit data operands
All operands are direct memory reference operands
Machine has 16 registers. So size of a register address is = 24 = 16 = 4 bits.
Machine uses an 8-bit opcode.

342_Program size for different Instruction Set Approaches.png

Figure: Program size for different Instruction Set Approaches

So the expectation that a CISC will generate smaller programs may not be realised.

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