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<span id="LZCNT"></span>
==LZCNT==
Count the Number of Leading Zero Bits, [[BitScan#LeadingZeroCount|Leading Zero Count]], initially from [[AMD|AMD's]] [[SSE4#SSE4a|SSE4a]] aka [[SSE4#ABM|Advanced Bit Manipulations]] (ABM).
<pre>
unsigned __int64 _lzcnt_u64(unsigned __int64 src);
<span id="TZCNT"></span>
==TZCNT==
Count the Number of Trailing Zero Bits , [[BitScan#TrailingZeroCount|Trailing Zero Count]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74989 Looking for intrinsic "least significant bit" on Visual Studio] by [[Oliver Brausch]], [[CCC]], September 03, 2020</ref>.
<pre>
unsigned __int64 _tzcnt_u64(unsigned __int64 src);
