We will review some recent work with M. Beccaria and S. Giombi
on checking AdS/CFT duality by reproducing certain supersymmetric localization results
in 3d superconformal Chern-Simons-matter (ABJM) theory by semiclassical
quantization of supermembrane in dual 11d background. Examples include
large N expectation value of BPS Wilson loop and instanton contribution to
free energy of ABJM theory on 3-sphere. Similar results are found for
non-perturbative terms in the supersymmetric partition function (index) of 6d (2,0) theory
on S5 x S1 that are captured at large N by quantum M2 brane in dual M-theory background.