3.238. __nv_log2f

float @__nv_log2f(float %x)

Calculate the base 2 logarithm of the input argument.

Calculate the base 2 logarithm of the input argument x.

Note

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

Returns

• __nv_log2f( \(\pm 0\) ) returns \(-\infty\).

• __nv_log2f(1) returns +0.

• __nv_log2f(x) returns NaN for x < 0.

• __nv_log2f( \(+\infty\) ) returns \(+\infty\).