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Emulated FPU isn't even meant to be timing accurate. Also there are 3 different FPU modes. 64-bit is usually much faster than 80-bit (almost no program cares). Softfloat is much slower but bit perfect accurate.
Real world 6888x are quite slow anyway, most FPU instructions take at least 50 cycles. 68040+ FPU is much faster.
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