3.224. __nv_log2f

Prototype: 

float @__nv_log2f(float %x)

Description:

Calculate the base 2 logarithm of the input argument x.

Returns:

  • __nv_log2f( ± 0 ) returns − ∞ .

  • __nv_log2f(1) returns +0.

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

  • __nv_log2f( + ∞ ) returns + ∞ .

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