3.194. __nv_ilogb

i32 @__nv_ilogb(double %x)

Compute the unbiased integer exponent of the argument.

Calculates the unbiased integer exponent of the input argument x.

Note

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

Returns

  • If successful, returns the unbiased exponent of the argument.

  • __nv_ilogb(0) returns INT_MIN.

  • __nv_ilogb(NaN) returns INT_MIN.

  • __nv_ilogb(x) returns INT_MAX if x is \(\infty\) or the correct value is greater than INT_MAX.

  • __nv_ilogb(x) return INT_MIN if the correct value is less than INT_MIN.