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fmaf(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():
       _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.

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 4.09 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
   https://www.kernel.org/doc/man-pages/.

                              2016-03-15                            FMA(3)



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