__device__ float logbf ( float  x  ) 

Calculate the floating point representation of the exponent of the input argument x.

Returns:
  • logbf$(\pm 0)$ returns $-\infty$
  • logbf$(\pm \infty)$ returns $+\infty$
Note:
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.


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