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Not necessarily: if your cospi(x) function is always returning 1.0 (https://github.com/JuliaLang/julia/issues/30073#issuecomment...), but you wrote your code assuming the result was in a different interval, then you could quite easily invoke undefined behavior.
> When we were debating whether WebAssembly should support subnormal numbers (i.e. be IEEE compliant), some people often cited these mythical subnormal slowdowns. So Dan Gohman ran some benchmarks and the scary-sounding slowdowns amounted to something like less than 1% (i.e. noise) for almost all benchmarks. Interestingly, one benchmark did not converge correctly with FTZ (i.e. no subnormals) and actually ran 3x more iterations, leading to a 3x slowdown.
I recently built a modular additive music synthesizer called Flow (https://github.com/eclab/flow). When certain modules in the synthesizer push certain doubles into the denormal range, my synthesizer will experience a roughly 100x slowdown. Mind you, this wasn't due to DSP or anything, and Flow is written in 100% pure Java. Since Java can't turn off denormals, I have to manually check for and zero them at strategic locations to avoid getting mired in the denormal quicksand.