  Successive cancellation list decoders with flip operations (SCL-Flip) can
utilize re-decoding attempts to significantly improve the error-correction
performance of polar codes. However, these re-decoding attempts result in extra
computation complexity, which thus leads to increased energy consumption and
decoding latency to the communication system adopting SCL-Flip decoders. To
significantly reduce the computation complexity of current SCL-Flip decoders,
we design a new adaptive SCL-Flip (AD-SCLF) decoder, which can be easily
implemented based on existing SCL-Flip techniques. Simulation results showed
that the AD-SCLF can reduce up to 80.85\% of the computational complexity of a
current SCL-Flip decoder at a matched $FER=10^{-3}$. The result implies our
decoder can significantly reduce the energy consumption caused by redundant
re-decoding attempts from the SCL-Flip decoder.
