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Both uses of ctz have already eliminated zero, and thus the difference in edge conditions between the two routines is irrelevant. Signed-off-by: Richard Henderson <rth@twiddle.net> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>