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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 infi-nite, infinite,
     nite, 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