Comment by StilesCrisis

Agner Fog is also discussing CPU architecture, not high-level language. The whole point is that the optimizer _already_ takes knows these things and rewrites your code automatically. If you write a zero-to-100 loop in C, that doesn’t mean the assembly will literally show a value going from zero to 100; it may unroll, or reverse the loop order, or any weird combination of things that the optimizer has decided will be equivalent and fast.