## 3.250. __nv_powi

Prototype:

```double @__nv_powi(double %x, i32 %y)

```

Description:

Calculate the value of x to the power of y

Returns:

• __nv_powi( $±0$ , y) returns $±\infty$ for y an integer less than 0.

• __nv_powi( $±0$ , y) returns $±0$ for y an odd integer greater than 0.

• __nv_powi( $±0$ , y) returns +0 for y > 0 and not and odd integer.

• __nv_powi(-1, $±\infty$ ) returns 1.

• __nv_powi(+1, y) returns 1 for any y, even a NaN.

• __nv_powi(x, $±0$ ) returns 1 for any x, even a NaN.

• __nv_powi(x, y) returns a NaN for finite x < 0 and finite non-integer y.

• __nv_powi(x, $-\infty$ ) returns $+\infty$ for $|x|<1$ .

• __nv_powi(x, $-\infty$ ) returns +0 for $|x|>1$ .

• __nv_powi(x, $+\infty$ ) returns +0 for $|x|<1$ .

• __nv_powi(x, $+\infty$ ) returns $+\infty$ for $|x|>1$ .

• __nv_powi( $-\infty$ , y) returns -0 for y an odd integer less than 0.

• __nv_powi( $-\infty$ , y) returns +0 for y < 0 and not an odd integer.

• __nv_powi( $-\infty$ , y) returns $-\infty$ for y an odd integer greater than 0.

• __nv_powi( $-\infty$ , y) returns $+\infty$ for y > 0 and not an odd integer.

• __nv_powi( $+\infty$ , y) returns +0 for y < 0.

• __nv_powi( $+\infty$ , y) returns $+\infty$ for y > 0.

Note:

For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 7.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes