3.195. __nv_ilogbf

i32 @__nv_ilogbf(float %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, Single-Precision Floating-Point Functions section.

Returns

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

  • __nv_ilogbf(0) returns INT_MIN.

  • __nv_ilogbf(NaN) returns INT_MIN.

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

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