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'''x86-Instructions''' <br/>
[[x86]] processor provides a bit-test instruction family (bt, bts, btr, btc) with 32- and 64-bit operands. They may be used implicitly by compiler optimization or explicitly by inline assembler or compiler intrinsics. Take care that they are applied on local variables likely registers rather than memory references<ref>[https://groups.google.com/forum/#!topic/fishcooking/TplkvO62I9U On the speed of SquareBB array] by protonspring, [[Computer Chess Forums|FishCooking]], March 22, 2019</ref>:
* [[x86-64#gpinstructions|_bittest64]]
* [[x86-64#gpinstructions|_bittestandset64]]
* [https://www.stmintz.com/ccc/index.php?id=450730 mask of highest bit] by [[Andrew Shapira]], [[CCC]], September 21, 2005
* [http://www.talkchess.com/forum/viewtopic.php?t=47710 How to Shift Left (by) a Negative Number??] by [[Steve Maughan]], [[CCC]], April 05, 2013
* [http://www.open-chess.org/viewtopic.php?f=5&t=2878 To shift or not to shift] by thevinenator, [[Computer Chess Forums|OpenChess Forum]], September 09, 2015» [[Space-Time Tradeoff]]* [https://groups.google.com/forum/#!topic/fishcooking/TplkvO62I9U On the speed of SquareBB array] by protonspring, [[Computer Chess Forums|FishCooking]], March 22, 2019
=External Links=
