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Minimal test - lines (13, 60)

Code

__asm__("invoke_copy_to_stack") __attribute__((used));

static void
invoke_copy_to_stack(uint64_t* d, uint32_t paramCount, nsXPTCVariant* s)
{
    const uint8_t NUM_ARG_REGS = 6-1;        // -1 for "this" pointer

    for(uint32_t i = 0; i < paramCount; i++, d++, s++)
    {
        if(s->IsPtrData())
        {
            *d = (uint64_t)s->ptr;
            continue;
        }
        switch(s->type)
        {
        case nsXPTType::T_I8     : *d = (uint64_t)s->val.i8;     break;
        case nsXPTType::T_I16    : *d = (uint64_t)s->val.i16;    break;
        case nsXPTType::T_I32    : *d = (uint64_t)s->val.i32;    break;
        case nsXPTType::T_I64    : *d = (uint64_t)s->val.i64;    break;
        case nsXPTType::T_U8     : *d = (uint64_t)s->val.u8;     break;
        case nsXPTType::T_U16    : *d = (uint64_t)s->val.u16;    break;
        case nsXPTType::T_U32    : *d = (uint64_t)s->val.u32;    break;
        case nsXPTType::T_U64    : *d = (uint64_t)s->val.u64;    break;
        case nsXPTType::T_FLOAT  :
            if(i < NUM_ARG_REGS)
            {
                // convert floats to doubles if they are to be passed
                // via registers so we can just deal with doubles later
                union { uint64_t u64; double d; } t;
                t.d = (double)s->val.f;
                *d = t.u64;
            }
            else
                // otherwise copy to stack normally
                *d = (uint64_t)s->val.u32;
            break;
        case nsXPTType::T_DOUBLE : *d = (uint64_t)s->val.u64;    break;
        case nsXPTType::T_BOOL   : *d = (uint64_t)s->val.b;      break;
        case nsXPTType::T_CHAR   : *d = (uint64_t)s->val.c;      break;
        case nsXPTType::T_WCHAR  : *d = (uint64_t)s->val.wc;     break;
        default:
            // all the others are plain pointer types
            *d = (uint64_t)s->val.p;
            break;
        }
    }
}