patch avx512 dispatch for 8bit_direct for PR 3853 #3871
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Summary:
Context in https://www.internalfb.com/diff/D62989543?dst_version_fbid=830141322266715&transaction_fbid=927659569187374
8bit_direct no longer has a huge regression https://www.internalfb.com/phabricator/paste/view/P1596996696 because we will branch to avx2 if
d
(size of the input vectors) is not a multiple of 32 but a multiple of 16.Differential Revision: D62990470