Primitive constant unfolding

Examining the core generated by ghc with -O2 on a numerical code, I saw things like :

case GHC.Prim.<## x_aB9 (GHC.Prim.**## 2.0 -1021.0) of _  {...

This code being executed each time my code performs an addition ! GHC does not seem to unfold the constants right with at least **##. By the way, it should definitely be possible to specify a Double# constant in hexadecimal.

Edited Mar 09, 2019 by Ian Lynagh -

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Primitive constant unfolding