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FMA(3) | Linux Programmer's Manual | FMA(3) |
NAME¶
fma, fmaf, fmal - floating-point multiply and addSYNOPSIS¶
#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)):
_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.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.
VERSIONS¶
These functions first appeared in glibc in version 2.1.CONFORMING TO¶
C99, POSIX.1-2001.SEE ALSO¶
remainder(3), remquo(3)COLOPHON¶
This page is part of release 3.44 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/.2010-09-20 |