libdevice User's Guide :: CUDA Toolkit Documentation

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3.145. __nv_fmaf

Prototype:

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

Description:

Compute the value of $x \times y + z$ as a single ternary operation. After computing the value to infinite precision, the value is rounded once.

Returns:

Returns the rounded value of

x \times y + z

as a single operation.

__nv_fmaf( $\pm \infty$ , $\pm 0$ , z) returns NaN.
__nv_fmaf( $\pm 0$ , $\pm \infty$ , z) returns NaN.
__nv_fmaf(x, y, $- \infty$ ) returns NaN if $x \times y$ is an exact $+ \infty$ .
__nv_fmaf(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 D.1, Table 6.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes