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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; 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 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 func-
       tions.

       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.

CONFORMING TO
       C99, POSIX.1-2001.

SEE ALSO
       remainder(3), remquo(3)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                  2008-10-06                            FMA(3)