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libdevice User's Guide
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CUDA Toolkit v5.5
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3.105. __nv_fast_log2f
Prototype:
float @__nv_fast_log2f(float %x)
Description:
Calculate the fast approximate base 2 logarithm of the input argument x.
Returns:
Returns an approximation to .
Note:
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-4.
Input and output in the denormal range is flushed to sign preserving 0.0.
Library Availability:
Compute 2.0: Yes
Compute 3.0: Yes
Compute 3.5: Yes
libdevice User's Guide
(PDF)
-
CUDA Toolkit v5.5
(older)
-
Last updated
July 19, 2013
-
Send Feedback