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Introduction to Computer Architectures 1 Answers ICAR Software Laboratory : VAX Question: When reading an instruction from memory what is the advantage of specifying the destination register last? Answer: may be possible to fetch operand data whilst instruction is read (instruction may take a number of cycles to read) i.e. result has not been generated, therefore, destination register is not needed at this time. Question: Why would an Addb2 instruction execute faster than an Addb3 instruction? Answer: may be quicker as instruction length is smaller as less information must be read from memory. Questions: What is the advantage / disadvantage of an instruction set that allows the numbers of operands to be selected i.e. 2 or 3 operand formats? Answer: don’t always need three operands i.e. separate source and destinations, therefore, can save instruction memory by using a smaller instruction. Question: how many bits will be required to encode this addl3 instruction?
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  • Winter '19
  • oussama jadayel
  • Computer Architecture, SEPTA Regional Rail, Central processing unit, Processor register, Machine code

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