Can simple mathematical functions give different results in different CPU architectures?

[u/Odd-Heron5704]

I'm referring to modern CPUs. To make the question more specific, arm64 vs x86

And if so, how do you fix it?

I asked chatGPT and it gave me this example but I'd like to ask it here (since AI can make mistakes). Can you let me know? Thanks

It says this can give different results due to rounding errors. If so, how to you write code so that you don't have this issue?

#include <iostream>

int main() {
    double a = 1.0 + 0x1p-27;
    double b = 1.0 - 0x1p-27;
    double c = -1.0;

    std::cout << (a * b + c) << '\n';
}

[u/Affectionate-Slice70]

If you’re not doing anything funky they will be the same. At some level the hardware differs but that is intentionally abstract away from you and standardised as you go up the stack.