id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
5414,Add unsafeShift to Data.Bits,tibbe,simonmar,"`shiftL` and `shiftR` introduce an extra branch to check for overflows (i.e. shifts with an amount larger than 32/64). This branch gets removed if the shift amount is statically known, but otherwise leaves a branch in the optimized code, slowing down bit manipulation code.

`unsafeShiftL` and `unsafeShiftR` translate directly to the underlying hardware operation (which is undefined for shift amount larger than the architectures word size).
",feature request,closed,normal,7.4.1,libraries/base,7.2.1,fixed,,,Unknown/Multiple,Unknown/Multiple,None/Unknown,,,,,