---
title: 毕昇编译器向量化方法
description: "test.c："
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sourcePath: /source/zh/kunpengaccel/math-lib/devg-kml/kunpengaccel_kml_0441.html
indexId: 1bfb6a24a0b6a6e8b15a5214879404c17b99685fb02d58ab700762f5a2231cbc68
---
# 毕昇编译器向量化方法

#### 示例

test.c：

```
#include <km.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
        long loop = 1e7;
        int len = 8192;
        float *a = (float*)malloc(sizeof(float) * len);
        float *b = (float*)malloc(sizeof(float) * len);
        float *d = (float*)malloc(sizeof(float) * len);
        for (int i = 0; i < len; i++) {
                a[i] = rand() * 7.7680f - 6.3840f;
                b[i] = rand() * 8.7680f - 6.3840f;
                d[i] = 0;
        }
        for (int i = 0; i < loop; i++) {
                for (int j = 0; j < len; j++) {
                        d[j] = expf(a[j]);
                }
        }
        printf("%f\n", d[0]);
        return 1;
}
```

编译指令：

```
clang test.c -lksvml -fveclib=MATHLIB -lkm -lm -O3
```

使用nm命令查看调用接口：

```
nm -D a.out
```


出现_ZGVnN4v_前缀接口表示调用成功。