__device__ float frexpf ( float  x,
int *  nptr 
)

Decomposes the floating-point value x into a component m for the normalized fraction element and another term n for the exponent. The absolute value of m will be greater than or equal to 0.5 and less than 1.0 or it will be equal to 0; $x = m\cdot 2^n$. The integer exponent n will be stored in the location to which nptr points.

Returns:
Returns the fractional component m.
  • frexp(0, nptr) returns 0 for the fractional component and zero for the integer component.
  • frexp($\pm 0$, nptr) returns $\pm 0$ and stores zero in the location pointed to by nptr.
  • frexp($\pm \infty$, nptr) returns $\pm \infty$ and stores an unspecified value in the location to which nptr points.
  • frexp(NaN, y) returns a NaN and stores an unspecified value in the location to which nptr points.
Note:
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.


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