我正在嘗試通過使用優化一些C ++（RK4）__builtin_prefetch我不知道如何預取整個結構。我不知道const void *addr讀了多少書。我希望有下一個值from和to加載。for (int i = from; i < to; i++){    double kv = myLinks[i].kv;    particle* from = con[i].Pfrom;    particle* to = con[i].Pto;    //Prefetch values at con[i++].Pfrom & con[i].Pto;    double pos = to->px- from->px;    double delta = from->r + to->r - pos;    double k1 = axcel(kv, delta, from->mass) * dt; //axcel is an inlined function    double k2 = axcel(kv, delta + 0.5 * k1, from->mass) * dt;    double k3 = axcel(kv, delta + 0.5 * k2, from->mass) * dt;    double k4 = axcel(kv, delta + k3, from->mass) * dt;    #define likely(x)       __builtin_expect((x),1)    if (likely(!from->bc))    {            from->x += (( k1 + 2 * k2 + 2 * k3 + k4) / 6);    }}鏈接：http：//www.ibm.com/developerworks/linux/library/l-gcc-hacks/