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Re:Popcount CPU instruction by vnorilo on Monday September 09, 2019 @04:13AM (#20916145)
This thread [1] might give you some idea of the complexity involved in a similar issue.

OTOH, if you see RAX being zeroed before using EAX, it is likely to be about breaking false deps.

1: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86314

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