3.249. __nv_powf

Prototype:

float @__nv_powf(float %x, float %y)



Description:

Calculate the value of x to the power of y

Returns:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Note:

For accuracy information see the CUDA C++ Programming Guide, Mathematical Functions Appendix, Single-Precision Floating-Point Functions section.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes