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Enable POPCNT at runtime
authorMarco Costalba <mcostalba@gmail.com>
Thu, 21 May 2009 14:41:31 +0000 (16:41 +0200)
committerMarco Costalba <mcostalba@gmail.com>
Thu, 21 May 2009 14:41:31 +0000 (16:41 +0200)
Runtime detect POPCNT instruction support and
use it.

Also if POPCNT is not supported we don't add _any_ overhead so
that we don't lose any speed in standard case.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

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