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 ± 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, ± ) 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, ) returns + for | x | < 1 .

  • __nv_powi(x, ) returns +0 for | x | > 1 .

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

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

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

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

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

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

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

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

Note:

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

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes