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Re:Echo – Assembly program that prints the first positional ... by userbinator on Monday January 02, 2017 @09:35AM (#13301314)
How is `repne` implemented?

It's a microcode loop. Here is the appropriate pseudocode (this is extracted from the Intel manuals):

http://qcd.phys.cmu.edu/QCDcluster/intel/vtune/reference/vc2...

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