# FMA(3) - man page online | library functions

Floating-point multiply and add.

Chapter

2015-04-19

FMA(3) Linux Programmer's Manual FMA(3)## 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(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99## DESCRIPTION

These functions compute x * y + z. The result is rounded as one ternary operation accord‐ ing 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.## 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). ┌──────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────┼───────────────┼─────────┤ │fma(), fmaf(), fmal() │ Thread safety │ MT-Safe │ └──────────────────────┴───────────────┴─────────┘## CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.## SEE ALSO

remainder(3), remquo(3)## COLOPHON

This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.2015-04-19 FMA(3)

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fma(3) | referred by | |

refer to | attributes(7) | feature_test_macros(7) | fenv(3) | math_error(7) | remainder(3) | remquo(3) |