If intrinsics like _popcount() and _leadz() are available to the GCC compiler, I would like to read about them, download the proper libraries, and know what compiler options to invoke.
http://lmgtfy.com/?q=site%3Agnu.org+gcc+intrinsic+popcount+leadz
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http://lmgtfy.com/?q=site%3Agnu.org+gcc+intrinsic+popcount+leadz
If you feel the need to discuss further, please use the mailing list:
https://lists.sourceforge.net/lists/listinfo/mingw-users