Full description
The "Numeric.FastMath" module brings into scope many unsafe @RULES@ for
'Float's and 'Double's that can greatly improve run time performance.
It is roughly equivalent to gcc\'s @-ffast-math@ compiler flag.
Optimisation (at least @-O1@) must be enabled for any @RULES@ to take effect.
These rules are unsafe because they don't strictly adhere to the
IEEE-754 regulations and may subtly change the results of your numeric computations.
See the <http://github.com/liyang/fast-math/ README> on github for more details.
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