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Decimal128
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You can find a whole bunch of loadable extensions at:

<http://www.dessus.com/files/sqlite3extensions.zip>

The particular math and floating pointing functions are in:

<http://www.dessus.com/files/sqlmath.c>  
<http://www.dessus.com/files/sqlfcmp.c>  

(the epsilon/ulp/ulps/rounding functions are in the latter sqlfcmp.c)

The zip file is so big because it also contains the (I believe current) GeoJSON for creation of the lat/long to timezone database plus the wee Python programs that will create the database for use by the "modified" datetime functions.