Function CompareFunctions

hlslparser/src/HLSLParser.cpp:1767–1801

};

static CompareFunctionsResult CompareFunctions(HLSLTree* tree, const HLSLFunctionCall* call, const HLSLFunction* function1, const HLSLFunction* function2)
{
    int* function1Ranks = static_cast<int*>(alloca(sizeof(int) * call->numArguments));
    int* function2Ranks = static_cast<int*>(alloca(sizeof(int) * call->numArguments));

    const bool function1Viable = GetFunctionCallCastRanks(tree, call, function1, function1Ranks);
    const bool function2Viable = GetFunctionCallCastRanks(tree, call, function2, function2Ranks);

    // Both functions have to be viable to be able to compare them
    if (!(function1Viable && function2Viable)) {
        if (function1Viable) {
            return Function1Better;
        }
        else if (function2Viable) {
            return Function2Better;
        }
        else {
            return FunctionsEqual;
        }
    }

    std::sort(function1Ranks, function1Ranks + call->numArguments, CompareRanks());
    std::sort(function2Ranks, function2Ranks + call->numArguments, CompareRanks());

    for (int i = 0; i < call->numArguments; ++i) {
        if (function1Ranks[i] < function2Ranks[i]) {
            return Function1Better;
        }
        else if (function2Ranks[i] < function1Ranks[i]) {
            return Function2Better;
        }
    }

    return FunctionsEqual;
}

static bool GetBinaryOpResultType(HLSLBinaryOp binaryOp, const HLSLType& type1, const HLSLType& type2, HLSLType& result)
{