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Q. Basic Tradeoff of concerns for instruction set design?
Basic Tradeoff: Smaller instruction (less space) vs. desire for more powerful instruction repertoire.
Generally programmer desire:
Though a 32 bit instruction however will occupy double the space and can be fetched at double the rate of a 16 bit instruction thoughcan't be doubly useful.
Factors which are must to be considered for deciding about instruction length:
Generally an instruction length is kept as a multiple of length of a character (which is 8 bits), and equal to length of fixed-point number. The term word is commonly used in this context. Generally the word size is equal to length of fixed point number or equal to memory-transfer size. Additionally a word must store integral number of characters. So word size of 16 bit, 32 bit, 64 bit are to be coming very common and henceforth the similar length of instructions are normally being used.
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