libdevice User's Guide :: CUDA Toolkit Documentation

3.164. __nv_frexp

Prototype:

double @__nv_frexp(double %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_frexp(0, nptr) returns 0 for the fractional component and zero for the integer component.
__nv_frexp( $\pm 0$ , nptr) returns $\pm 0$ and stores zero in the location pointed to by nptr.
__nv_frexp( $\pm \infty$ , nptr) returns $\pm \infty$ and stores an unspecified value in the location to which nptr points.
__nv_frexp(NaN, y) returns a NaN and stores an unspecified value in the location to which nptr points.

Note:

For accuracy information see the CUDA C++ Programming Guide, Mathematical Functions Appendix, Double-Precision Floating-Point Functions section.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes