osx man page for fma

FMA(3)							   BSD Library Functions Manual 						    FMA(3)

NAME
     fma -- multiply and add, then round

SYNOPSIS
     #include <math.h>

     double
     fma(double x, double y, double z);

     long double
     fmal(long double x, long double y, long double z);

     float
     fmaf(float x, float y, float z);

DESCRIPTION
     The fma() functions compute (x*y)+z, rounded as one ternary operation: they compute the value (as if) to infinite precision and round once to
     the result format, according to the current rounding mode.

SPECIAL VALUES
     fma(x, y, z) returns a NaN and optionally raises the "invalid" floating-point exception if one of x and y is infinite, the other is 0, and z
     is a NaN.

     fma(x, y, z) returns a NaN and raises the "invalid" floating-point exception if one of x and y is infinite, the other is 0, and z is not NaN.

     fma(x, y, z) returns a NaN and raises the "invalid" floating-point exception if x times y is an exact infinity, and z is also an infinity but
     with the opposite sign.

SEE ALSO
     fdim(3), fmax(3), fmin(3)

STANDARDS
     The fma() functions conform to ISO/IEC 9899:2011.

BSD
								   May 28, 2008 							       BSD