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3.180. __nv_ilogb

Prototype:

i32 @__nv_ilogb(double %x) 

Description:

Calculates the unbiased integer exponent of the input argument x.

Returns:

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

  • __nv_ilogb(0) returns INT_MIN.

  • __nv_ilogb(NaN) returns NaN.

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

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

Note:

For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-2.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes


libdevice User's Guide (PDF) - CUDA Toolkit v5.5 for POWER8 (older) - Last updated October 16, 2014 - Send Feedback