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lfragago

By loss of software portability what we really mean is "change in code performance".

In a given system Version A of a program may run faster than Version B of the same program, but on a different system Version B could run faster than Version A.

pdp

@Ifragago: It could also mean that the software works on one machine and doesn't on another. Some machines could have AVX instructions supported while others might not. So, it's not just code performance, but also software compatibility.