CodeQL library for C/C++
codeql/cpp-all 1.1.0 (changelog, source)
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Member predicate IRGuardCondition::comparesEq

Holds if (determined by this guard) left == right + k evaluates to areEqual if this expression evaluates to testIsTrue.

predicate comparesEq(Operand left, Operand right, int k, boolean areEqual, boolean testIsTrue)