---
title: vsumval
description: "实数向量求真值数目运算。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengaccel/system-lib/ug-kvsip/kunpengaccel_kvsip_06_0051.html
sourcePath: /source/zh/kunpengaccel/system-lib/ug-kvsip/kunpengaccel_kvsip_06_0051.html
indexId: 1022dd0dff348da28274d75f1410ae5ba6f4c8642d401be3c3dc7cd4bff7327675
---
# vsumval

实数向量求真值数目运算。

函数接口声明如下：

float型函数的操作：

uint64_t (vsip_vsumval_bl)(const vsip_vview_bl *a);

#### 参数

| 参数名 | 描述 | 取值范围 | 输入/输出 |
| --- | --- | --- | --- |
| a | 指向源向量的指针。 | 非空 | 输入 |


#### 异常输入

空指针输入时，函数直接返回0。


#### 示例

```
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "kvsip.h"
#include "vsip.h"
#include "vsip_type.h"

#define BUFFER_SIZE_T 10
void VsumvalExample()
{
    int32_t src[BUFFER_SIZE_T] = {1, 6, -1, 0, 3, -4, 0, 9, -5, 2};
    int64_t stride = 1;
    uint64_t offset = 0;

    vsip_block_bl *block_a = vsip_blockbind_bl(src, BUFFER_SIZE_T, VSIP_MEM_NONE);

    vsip_vview_bl *a = vsip_vbind_bl(block_a, offset, stride, BUFFER_SIZE_T);
    vsip_blockadmit_bl(block_a, VSIP_TRUE);

    uint64_t dst = vsip_vsumval_bl(a);

    vsip_valldestroy_bl(a);

    printf("src:\n");
    for (int32_t i = 0; i < BUFFER_SIZE_T; ++i) {
        printf("%2d ", src[i]);
    }
    printf("\ndst: %lu\n", dst);
}

int main(void) {
    VsumvalExample();
    return 0;
}
```

运行结果：

```
src:
 1  6 -1  0  3 -4  0  9 -5  2
dst: 8
```