opencl:一个关于向量赋值的异常

typedef struct _detected_objects_buffer {
    cl_float4 storage[MAX_DETECTED_OBJECT_NUM];
    cl_int  detected_num;
    kernel_error status;
}detected_objects_buffer;

inline void copy_detected_obj_to_host(const __local int4* detected_obj
    , __global detected_objects_buffer* out
    , int object_num    
    , const int win_size
    , const int dist_size
    , const int2 img_size){ 
    ...//其他代码
    float4 obj;
    for(int i=0; i < object_num  ; ++i){
        ...//其他代码
        //向__global指针写入向量数据之方法一：直接赋值    
        out->storage[out->detected_num+i]=obj;
        //向__global指针写入向量数据之方法二：调用vstore函数  
        vstore4( obj ,out->detected_num+i,(__global float*)out->storage);// 
        ...//其他代码
    }   
}