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Herbert Valerio Riedel authored
The existing `decodeDouble_2Int#` primop is rather inconvenient to use (and in fact is not even used by `integer-gmp`) as the mantissa is split into 3 components which would actually fit in an `Int64#` value. However, `decodeDouble_Int64#` is to be used by the new `integer-gmp2` re-implementation (see #9281). Moreover, `decodeDouble_2Int#` performs direct bit-wise operations on the IEEE representation which can be replaced by a combination of the portable standard C99 `scalbn(3)` and `frexp(3)` functions. Differential Revision: https://phabricator.haskell.org/D160
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