**fma**

SYNOPSIS
#include <math.h>
double fma(double x, double y, double z);
float fmaf(float x, float y, float z);
long double fmal(long double x, long double y, long double z);
Link with -lm.
Feature Test Macro Requirements for glibc (see **feature_test_macros(7)**):
fma(), fmaf(), fmal():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTION
The fma() function computes x * y + z. The result is rounded as one
ternary operation according to the current rounding mode (see **fenv(3)**).
RETURN VALUE
These functions return the value of x * y + z, rounded as one ternary
operation.
If x or y is a NaN, a NaN is returned.
If x times y is an exact infinity, and z is an infinity with the oppo-
site sign, a domain error occurs, and a NaN is returned.
If one of x or y is an infinity, the other is 0, and z is not a NaN, a
domain error occurs, and a NaN is returned.
If one of x or y is an infinity, and the other is 0, and z is a NaN, a
domain error occurs, and a NaN is returned.
If x times y is not an infinity times zero (or vice versa), and z is a
NaN, a NaN is returned.
If the result overflows, a range error occurs, and an infinity with the
correct sign is returned.
If the result underflows, a range error occurs, and a signed 0 is
returned.
ERRORS
See **math_error(7)** for information on how to determine whether an error
has occurred when calling these functions.
The following errors can occur:
Domain error: x * y + z, or x * y is invalid and z is not a NaN
An invalid floating-point exception (FE_INVALID) is raised.
Multithreading (see **pthreads(7)**)
The fma(), fmaf(), and fmal() functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001.
SEE ALSO
**remainder(3)**, **remquo(3)**
COLOPHON
This page is part of release 3.54 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2013-09-17 **FMA(3)**

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