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The rotation is to the left, but extract shifts to the right. The computation of the extract parameters needs adjusting. For the entry condition, simplify 64 - rot + len <= 64 -rot + len <= 0 len <= rot Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Reported-by: David Hildenbrand <david@redhat.com> Suggested-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>