CodeQL library for C/C++
codeql/cpp-all 0.4.4 (changelog, source)
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Predicate reachablePointlessComparison

Holds if cmp is a pointless comparison (see pointlessComparison above) and cmp occurs in reachable code. The reason for excluding expressions that occur in unreachable code is that range analysis sometimes can deduce impossible ranges for them. For example:

if (10 < x) { if (x < 5) { // Unreachable code return x; // x has an empty range: 10 < x && x < 5 } }

Import path

import semmle.code.cpp.rangeanalysis.PointlessComparison
predicate reachablePointlessComparison(ComparisonOperation cmp, float left, float right, boolean value, SmallSide ss)