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Zfa adds 'missing' floating-point functionality:
- fli.[hsdq]: floating-point load-immediate
- fminm/fmaxm.[hsdq]: IEEE 754-2019 minimum and maximum
- fround(nx)?.[hsdq]: IEEE 754-2019 roundToIntegral(Exact)?
- fcvtmod.w.d: ECMAScript modular float->integer conversion
- move instructions for XLEN < FLEN
- comparisons that support quiet NaN inputs
This adds a surprisingly large number of files, as the instructions
added with Zfa depend on context (e.g., .h-variants become available
only if Zfh is present).
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