it will be less efficient, i.e. slower, due both to having to specifically avoid what may be an optimal method and having to take code designed for other instruction sets and translate it first before processing it
Quoteit will be less efficient, i.e. slower, due both to having to specifically avoid what may be an optimal method and having to take code designed for other instruction sets and translate it first before processing itNot necessarily.First, they do not need to translate instructions if they intend to develop software stack (compiler's backend) and extract maximum performance by executing native code.
Third, ISA created from scratch doesn't mean it must be less efficient than existing one. For example, decoding variable length instructions without clear boundaries in x86 case is not easy and it is said to be one of the reasons why x86 decoders need substantial amount of power and current CPUs are limited in instruction fetch bandwidth. Being still able to execute 30-years code may sound attractive, but it is quite a high burden for instruction decoder.
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