Donald Bruce Stewart wrote:
Some things to remember using Doubles:

* {-# OPTIONS -fexcess-precision #-} * -fvia-C
    * -fbang-patterns
    * -optc-O2 -optc-mfpmath=sse -optc-msse2
    * -optc-march=pentium4

1. What do all those things do?
2. Is the effect actually that large?

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