fma
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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);
[Note] Note

Compile with −std=c99; link with −lm.

DESCRIPTION

The fma() function computes x * y + z. The result is rounded according to the rounding mode determined by the value of FLT_ROUNDS. FLT_ROUNDS indicates the implementation-defined rounding behavior for floating-point addition, and has one of the following values:

−1

The rounding mode is not determinable.

0

Rounding is towards 0.

1

Rounding is towards nearest number.

2

Rounding is towards positive infinity.

3

Rounding is towards negative infinity.

Other values represent machine-dependent, non-standard rounding modes.

CONFORMING TO

C99

SEE ALSO

fenv(3), remainder(3), remquo(3)

COLOPHON

This page is part of release 2.79 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/.


  Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)
Distributed under GPL, 2002-07-27 Walter Harms
Modified 2004-11-15, Added further text on FLT_ROUNDS
as suggested by AEB and Fabian Kreutz
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