Prototype:

i32 @__nv_signbitd(double %x) 

Description:

Determine whether the floating-point value x is negative.

Returns:

Returns a nonzero value if and only if x is negative. Reports the sign bit of all values including infinities, zeros, and NaNs.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes