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Posted on August 03, 2017 at 22:50
Your CPU only has a single precision FPU, this is why it the double precision computations are being done in software, it is using the FPU registers as extra holding space.
The FPU isn't inherently complicated, it only implements fairly basic math functionality which you can gleen from the opcode name. The cleverness with come from how you manage the register resources to minimize the movement in/out, and make the math flow. The FPU does not hold higher precision intermediate results.
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