If you try to make compile-time FP math behave exactly like run-time FP math, you'd not only have to use the same precision in the compiler, but also the same rounding mode, denormal handling etc., which can be changed at run time (http://dlang.org/phobos/core_stdc_fenv.html), so the exact same piece of code can yield different results based on the run-time FP-context.

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