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 excep-
tion 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 excep-
tion 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 9899:1999(E).
BSD May 28, 2008 BSD
Mac OS X 10.6 - Generated Thu Sep 17 20:19:46 CDT 2009