[AlotOfReading]

Your compiler does many optimizations that break numerical reproducibility, especially in floats. I reviewed a PR the other day that wrote X=AB+(CD)+E;

And when I checked 3 different compilers, each of them chose a different way to use FMAs.

Even with integer math, you can get different numerical results via UB (e.g. expressions with signed overflow one way and not another).

[daemin]

Floating point reproducibility and cross platform determinism requires strict adherence to the IEEE standard and disabling of fused instructions.

[AlotOfReading]

The point being that there are many other places where reproducibility fails to hold, especially when optimizations are involved. The standard doesn't mandate a way to disable contraction, nor the existence (or absence) of -ffast-math and others. They're simply different, legal compilations within the broad scope allowed under the standard.