PVS-Studio warning V501 for Dolphin

bool IRBuilder::maskedValueIsZero(InstLoc Op1, InstLoc Op2) const
{
  return (~ComputeKnownZeroBits(Op1) &
          ~ComputeKnownZeroBits(Op1)) == 0;
}

This suspicious code was found in Dolphin project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions '~ComputeKnownZeroBits(Op1)' to the left and to the right of the '&' operator. Core ir.cpp 1215

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/