3.293. __nv_rsqrtf

float @__nv_rsqrtf(float %x)

Calculate the reciprocal of the square root of the input argument.

Calculate the reciprocal of the nonnegative square root of x, \(1/\sqrt{x}\).

Note

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

Returns

Returns \(1/\sqrt{x}\).

• __nv_rsqrtf( \(+\infty\) ) returns +0.

• __nv_rsqrtf( \(\pm 0\) ) returns \(\pm \infty\).

• __nv_rsqrtf(x) returns NaN if x is less than 0.