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Minimal test - lines (16, 66)

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extern "C" uint32_t
invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
{
    uint32_t result = 0;
    for(uint32_t i = 0; i < paramCount; i++, s++)
    {
        if(s->IsPtrData())
        {
            result++;
            continue;
        }
        switch(s->type)
        {
        case nsXPTType::T_I8     :
        case nsXPTType::T_I16    :
        case nsXPTType::T_I32    :
            result++;
            break;
        case nsXPTType::T_I64    :
            result+=2;
            break;
        case nsXPTType::T_U8     :
        case nsXPTType::T_U16    :
        case nsXPTType::T_U32    :
            result++;
            break;
        case nsXPTType::T_U64    :
            result+=2;
            break;
        case nsXPTType::T_FLOAT  :
            result++;
            break;
        case nsXPTType::T_DOUBLE :
            result+=2;
            break;
        case nsXPTType::T_BOOL   :
        case nsXPTType::T_CHAR   :
        case nsXPTType::T_WCHAR  :
            result++;
            break;
        default:
            // all the others are plain pointer types
            result++;
            break;
        }
    }
    // nuts, I know there's a cooler way of doing this, but it's late
    // now and it'll probably come to me in the morning.
    if (result & 0x3) result += 4 - (result & 0x3);     // ensure q-word alignment
    return result;
}