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I have an application written in C# that invokes some C code as well. The C# code gets some double as an input, performs some calculations on it, pass it to the native layer that perform its own calculations on it, and then passes back to the C# layer.
If i run the same exe/dlls on different machines (all of them are x64 by Intel), is it possible that the final result i’ll get will be different on different machines?
If you use the same executable(s) the results should be the same. However, it is worth noting that floating-point calculations are usually highly customizable by a number of persistent settings (infinity mode, rounding mode etc.). This means that the same floating-point instruction can produce different results depending on the current combination of settings. If your application makes sure that all these settings are reset to the same values at the beginning of the execution, then the results should be the same. However, if some of these settings are not reset, or depend on external parameters (like environment variables), then in some circumstances you might end up observing different results on different machines.