浮点运算函数异常，asin,acos,exp

发布于 2023-07-06 20:45:44 浏览：339 订阅该版

```c
static char *ffunc[] = {
    "sin",
    "cos",
    "tan",
    "atan",
    "sqrt",
    "fabs",
    // cannot used below
    "asin",
    "acos",
    "log",
    "exp",
    "pow",
    NULL
};

static void ftest(int ac, char **av) 
{
    double foo;
    double res[20] = {1.0};
    int tmp;
    if (av[1] != NULL) {
        printf("your input must be in range 0-9\n");
        tmp = atoi(av[1])%10;
        foo = tmp/10.0;
    }
    else
        foo = 0.8;

printf("the calculation coff is %.2f\n", foo);

int j = 0;

res[j++] = sin(foo);
    res[j++] = cos(foo);
    res[j++] = tan(foo);
    res[j++] = atan(foo);
    res[j++] = sqrt(foo);
    res[j++] = fabs(foo);
    // res[j++] = asin(foo);
    // res[j++] = acos(foo);
    // res[j++] = log(foo);
    // res[j++] = exp(foo);
    // res[j++] = pow(2.0, foo);

for (int i = 0; ffunc[i] != NULL; i++) {
        printf("%d: %s %.2f\n", i, ffunc[i], res[i]);
    }
}

MSH_CMD_EXPORT(ftest, test float data calculation>);
```
发现asin, acos, log, exp, pow这几个浮点函数不可用，一调用程序就崩溃

zynq 7020平台，编译选项如下
```
DEVICE = ' -Wall -mcpu=cortex-a9 -mfpu=vfpv3 -ftree-vectorize -mfloat-abi=hard -ffunction-sections -munaligned-access -ffast-math'
```

请大神帮忙解答，是使用的问题么，rt 的版本是4.0.3

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230706/d270a0cd6278e99460727951250186fd.png)