libdevice User's Guide :: CUDA Toolkit Documentation

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libdevice User's Guide (PDF) - CUDA Toolkit v5.5 (older) - Last updated September 5, 2013 - Send Feedback

3.146. __nv_fmaf_rd

Prototype:

float @__nv_fmaf_rd(float %x, float %y, float %z)

Description:

Computes the value of $x \times y + z$ as a single ternary operation, rounding the result once in round-down (to negative infinity) mode.

Returns:

Returns the rounded value of

x \times y + z

as a single operation.

__nv_fmaf_rd( $\pm \infty$ , $\pm 0$ , z) returns NaN.
__nv_fmaf_rd( $\pm 0$ , $\pm \infty$ , z) returns NaN.
__nv_fmaf_rd(x, y, $- \infty$ ) returns NaN if $x \times y$ is an exact $+ \infty$ .
__nv_fmaf_rd(x, y, $+ \infty$ ) returns NaN if $x \times y$ is an exact $- \infty$ .

Note:

For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes

libdevice User's Guide (PDF) - CUDA Toolkit v5.5 (older) - Last updated September 5, 2013 - Send Feedback