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The point is that the same Instruction Set can be used differently.

And in practice, for efficiency purposes, that may matter a lot. An optimizing compiler can (and will, e.g. GCC with -O2 -mtune=native) produce different machine code for the same ISA, depending on the target processor. So the code optimized for an Intel processor is not the same as the code optimized for a AMD processor, even if it uses the same ISA. Machine code optimized for one will not be the fastest code on the other one.

The point is that the same Instruction Set can be used differently.

And in practice, for efficiency purposes, that may matter a lot. An optimizing compiler can (and will, e.g. GCC with O2 -mtune=native) produce different machine code for the same ISA, depending on the target processor. So the code optimized for an Intel processor is not the same as the code optimized for a AMD processor, even if it uses the same ISA. Machine code optimized for one will not be the fastest code on the other one.

The point is that the same Instruction Set can be used differently.

And in practice, for efficiency purposes, that may matter a lot. An optimizing compiler can (and will, e.g. GCC with -O2 -mtune=native) produce different machine code for the same ISA, depending on the target processor. So the code optimized for an Intel processor is not the same as the code optimized for a AMD processor, even if it uses the same ISA. Machine code optimized for one will not be the fastest code on the other one.

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source | link

The point is that the same Instruction Set can be used differently.

And in practice, for efficiency purposes, that may matter a lot. An optimizing compiler can (and will, e.g. GCC with O2 -mtune=native) produce different machine code for the same ISA, depending on the target processor. So the code optimized for an Intel processor is not the same as the code optimized for a AMD processor, even if it uses the same ISA. Machine code optimized for one will not be the fastest code on the other one.