3.232. __nv_modff


float @__nv_modff(float %x, float* %b) 


Break down the argument x into fractional and integral parts. The integral part is stored in the argument iptr. Fractional and integral parts are given the same sign as the argument x.


  • __nv_modff( ± x , iptr) returns a result with the same sign as x.

  • __nv_modff( ± , iptr) returns ± 0 and stores ± in the object pointed to by iptr.

  • __nv_modff(NaN, iptr) stores a NaN in the object pointed to by iptr and returns a NaN.


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

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes