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fma (3)
  • fma (3) ( Solaris man: Библиотечные вызовы )
  • fma (3) ( FreeBSD man: Библиотечные вызовы )
  • fma (3) ( Русские man: Библиотечные вызовы )
  • >> fma (3) ( Linux man: Библиотечные вызовы )
  • fma (3) ( POSIX man: Библиотечные вызовы )
  •  

    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 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.  

    CONFORMING TO

    C99, POSIX.1-2001.  

    SEE ALSO

    remainder(3), remquo(3)  

    COLOPHON

    This page is part of release 3.14 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/.


     

    Index

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


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