Manpage of FMA

FMA

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

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

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():

_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 xor yis a NaN, a NaN is returned.

If xtimes yis an exact infinity, and zis an infinity with the opposite sign, a domain error occurs, and a NaN is returned.

If one of xor yis an infinity, the other is 0, and zis not a NaN, a domain error occurs, and a NaN is returned.

If one of xor yis an infinity, and the other is 0, and zis a NaN, a domain error occurs, and a NaN is returned.

If xtimes yis not an infinity times zero (or vice versa), and zis 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.  

VERSIONS

These functions first appeared in glibc in version 2.1.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
fma(), fmaf(), fmal() Thread safetyMT-Safe
 

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.  

SEE ALSO

remainder(3), remquo(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
CONFORMING TO
SEE ALSO

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