Wrong ILogB result for subnormal values #116912
Description
Math.ILogB incorrectly uses TZCNT instead of LZCNT for subnormal values:
Math.ILogB(1e-308) returns -1024 on .NET 8, and -1012 on .NET 9. The correct result is -1024.
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Math.ILogB incorrectly uses TZCNT instead of LZCNT for subnormal values:
Math.ILogB(1e-308) returns -1024 on .NET 8, and -1012 on .NET 9. The correct result is -1024.