libdevice User's Guide :: CUDA Toolkit Documentation

3.165. __nv_frexpf

Prototype:

float @__nv_frexpf(float %x, i32* %b)

Description:

Decompose 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.

__nv_frexpf(0, nptr) returns 0 for the fractional component and zero for the integer component.
__nv_frexpf( $\pm 0$ , nptr) returns $\pm 0$ and stores zero in the location pointed to by nptr.
__nv_frexpf( $\pm \infty$ , nptr) returns $\pm \infty$ and stores an unspecified value in the location to which nptr points.
__nv_frexpf(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 D.1, Table 6.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes