|Copyright||(c) Bryan O'Sullivan 2009|
Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!
Fast, unchecked bit shifting functions.
class UnsafeShift a where Source
This is a workaround for poor optimisation in GHC 6.8.2. It fails to notice constant-width shifts, and adds a test and branch to every shift. This imposes about a 10% performance hit.
These functions are undefined when the amount being shifted by is greater than the size in bits of a machine Int#.
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