Man page - fma(3)

Packages contains this manual

Available languages:

en fr ja ru ro de

Manual

fma

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

fma, fmaf, fmal - floating-point multiply and add

LIBRARY

Math library ( libm , -lm )

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 );

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

fma (), fmaf (), fmal ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

These functions compute 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 opposite 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.

Range error: result overflow

An overflow floating-point exception ( FE_OVERFLOW ) is raised.

Range error: result underflow

An underflow floating-point exception ( FE_UNDERFLOW ) is raised.

These functions do not set errno .

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

Image grohtml-562229-1.png

STANDARDS

C11, POSIX.1-2008.

HISTORY

glibc 2.1. C99, POSIX.1-2001.

SEE ALSO

remainder (3), remquo (3)